193results about How to "Guaranteed dynamic performance" patented technology

The invention relates to a multitask concurrent executive system and a method for hybrid network service. The system comprises a client side, a load-balancing server, a signalling / media control server and an application server cluster. The running method thereof is as follows: after the client side receives a service request, the load-balancing server selects an optimum application server and transmits the service request to a service bus thereof. After an admission control module of the application server carries out admission control on the request, the service bus transmits the request to a dynamic flow execution engine, the dynamic flow execution engine starts a service flow corresponding to the request to analyze and process, and the service bus calls a corresponding service capability component in a low deferred event service engine and interacts with the signalling / media control server through the resource adapter so as to call the service resource of the latter; and a processing result is returned to the client side according to a reverse process. The multitask concurrent executive system supports the supply of hybrid network service over a telecommunication network and the internet and the multitask concurrent on a heterogeneous network and terminals.

The invention discloses an SINS / GPS super-compact integrated navigation system and an implementing method thereof. The method comprises the following steps: the doppler frequency assistance is provided for a GPS carrier loop by using the velocity information of a strapdown inertial navigation system, therefore, the loop equivalent bandwidth is increased, the influence of the carrier dynamic stateon the carrier loop is lowered, and the noise suppression capability is improved by reducing the bandwidth of a filter; meanwhile, in order to eliminate the correlation between the pseudo-range rate error and the inertial navigation error, a carrier loop tracking error model is obtained by establishing the relationship between the carrier tracking error and the inertial navigation speed error, andthe influence of the carrier tracking error is subduced in the measurement equation; and in addition, the carrier frequency is adjusted according to the output error estimation information, and the tracking accuracy of the carrier loop is enhanced. The invention can effectively enhance the noise suppression capability and the dynamic tracking performance of the tracking loop and enhance the tracking accuracy of a GPS receiver and the navigation accuracy of the integrated navigation system under strong interference and high dynamic circumstance.

The invention relates to a system and a method for supporting a mixed service based on an integrated open network. The system is provided with a template multiplexing-based service generation subsystem, a mixed service-oriented multitask concurrent execution subsystem, a service resource access subsystem and a service management subsystem. The system provides template multiplexing-based service generation and multitask concurrent execution in the integrated open network environment by integrating an IP network with a PSTN, a 2G mobile network, a 2.5G mobile network and a 3G mobile network, and Wi-Fi, Wi-MAX and all kinds of heterogeneous networks of packet data network. In the system, the quick service generation is realized due to the adoption of a service system structure-oriented SOA and on the basis of the template multiplexing thought; and operation environment of an integrated network service is provided on the basis of a service bus integrated with a dynamic flow performance engine and a low delay event service engine, so the service capacity of integrating the internet with the telecommunication field is realized, and the aim of providing flexible and various personalized services and supporting multitask concurrent execution is fulfilled.

The invention discloses an active defense method for a network trick and a counter attack. The method comprises the following steps that two communication sides set a plurality of host computers for data sending and receiving, and one host computer is dynamically and randomly selected as a communication host computer through an address and port hopping server; a sender selects one or more transmission links to send a trick message to detect the safety and the channel quality of the transmission links, wherein if the links are safe, true data with the counter attack are constructed and sent, and meanwhile the sender continues to send the trick message to detect the links; an intermediate node takes in charge of detecting and feeding the safety situation of the transmission links back to a network administrator; the network administrator updates a transmission path according to the safety situation of the node and takes the defensive measure. The active defense method can effectively prevent and detect common safety attack in the network communication and carry out certain counter attack on an attacker.

The invention discloses a dynamic cross-domain access control method based on a trust valuation mechanism, belonging to the technical field of network security. The method is based on the subjective logic theory and sets a credit value for each entity in a grid by introducing the trust valuation mechanism into access control, wherein different entity credit values correspond to different roles, and each role is provided with the relative authority. According to the historic access activities of the entities in the grids and the trust policy, when the credit values of the entities are changed, roles of the entities in the grids are changed, thereby dynamically changing the access authorities of the entities. The dynamic cross-domain access control method based on the trust valuation mechanism is reliable, dynamic and extendable, and can effectively achieve safe and dynamic resource sharing among the grid entities under the grid environment.

A control moment gyroscope (CMG) framework control system and a CMG framework control method for restraining dynamic unbalance disturbance of a rotor are provided. A feed-forward compensation module and an algorithm switching module are embedded on the basis of a double-loop PI control system. In preset Ng control cycles, the whole framework control system is set to a PI control mode; in each control cycle from the (Ng+1)th control cycle, the speed precision of a CMG framework in the current control cycle is calculated through the algorithm switching module, and whether there is a need to switch the control mode of the current control cycle is determined; if the control mode is a feed-forward compensation mode after switching, subtraction operation is carried out on a moment reference value output by a speed loop PI controller and a fed-back torque of a framework motor to get the mechanical torque error e(j+1) of the current control cycle, and the feed-forward compensation module calculates the current feed-forward compensation value Delta i(qref, j+1) of the current control cycle according to e(j+1) and adds Delta i(qref, j+1) to the double-loop PI control system; and if the control mode is a PI control mode after switching, current feed-forward compensation is blocked, and control is performed according to the double-loop PI control system.

The invention relates to an RFID (Radio Frequency Identification) triple safety certification method based on label ID (Identification) random division, comprising the following steps of: introducing a dynamic updating mechanism to randomly divide label ID into a left identifier and a right identifier for the data transmission of a communication link, and realizing the two-time certification of the identification validity of a label and a reader-writer in a triple certification mode; and meanwhile, by aiming at the particularity and the limitations of a forward air interface and a backward communication link of an RFID system, the method effectively solves the problems of label data safety and secret protection of the RFID system by utilizing an unidirectional Hash function and a symmetric encryption algorithm. The invention is novel and practical, adopts the lightweight operations of encryption, decryption, search and verification, saves label cost and power consumption, increases system safety and is suitable for the RFID system with higher safety and privacy requirements.

The invention discloses a self-adaptive grid-tied converter single phase soft phase-locked loop. The self-adaptive grid-tied converter single phase soft phase-locked loop comprises a phase discriminator, a low pass filter, a loop filter and an integrator module, wherein the loop filter is composed of a self-adaptive moving average filter and a proportion integration differentiation (PID) regulator, the phase discriminator is a multiplication phase discriminator, an input signal is a trigonometric function of an output angle of power grid voltage and a phase-locked loop, and an output signal is transmitted into the moving average filter; an input signal of the moving average filter is output of the phase discriminator and output of the low pass filter, and the output signal is transmitted to the PID regulator; and an input signal of the PID regulator is an output signal of the moving average filter, and the output signal is transmitted into the low pass filter and the integrator module. The self-adaptive grid-tied converter single phase soft phase-locked loop has the advantages that the loop filter is improved, effects of secondary ripple and harmonic voltage on phase lock result in the steady state are eliminated, and simultaneously the rapidity of the phase lock is guaranteed.

The invention discloses an evaluation method for small and micro enterprise operation projects, which includes determining indicators affecting the feasibility factors of the project according to the contents of the small and micro enterprises to be evaluated; determining the weight of each indicator in the Internet financial environment; summarizing The weight of each indicator and the detailed rules for scoring establish an initial weighted scoring model; modify the initial weighted model to obtain an optimized weighted scoring model; score the items to be evaluated according to the optimized weighted scoring model; Scoring, determining the funding policy of the project and other steps. Its remarkable effect is: the weighted scoring model is adopted, and each indicator is given a weight, which fully considers the impact of the current Internet financial environment on the indicators and weights of the development factors of small and micro enterprises. Compared with the non-weighted evaluation model, the reliability is more reliable. High, the obtained score has a strong reference for the project managers of makerspaces.

The invention discloses a rotating speed ripple reduction method of a high-precision permanent-magnet synchronous motor alternating current servo system based on a repetitive controller. The method is suitable for high-precision control of a permanent-magnet synchronous motor. The method comprises the steps that steady state speed fluctuation information is acquired; a primary frequency fluctuation component and a secondary frequency fluctuation component at each given speed are obtained by fast fourier analysis; a corresponding data table of each given speed and every two frequency fluctuation components is established according to experimental data; on this basis, a current loop and a motor serve as generalized objects, and the repetitive controller is set at a speed ring for inhibiting steady state fluctuation; and a compound controller output is obtained by combining with a PI (Proportional-Integral) controller for ensuring the dynamic output performance of the system. The method is simple to realize and less in parameter adjustment, can effectively reduce the steady state fluctuation of the permanent-magnet synchronous motor alternating current servo system, achieves a purpose of improving the steady state precision of the permanent-magnet synchronous motor alternating current servo system, and satisfies an application in the field of high-performance permanent-magnet synchronous motor alternating current servos.

The invention provides a hypersonic flight vehicle attitude control method considering input saturation, which comprises the following steps of: 1, combining uncertainty of parameters, unmodeled dynamics and external disturbance in an unpowered reentry process mathematical model of a hypersonic flight vehicle to serve as total disturbance, and establishing models of an attitude loop and an angularrate loop, 2, designing a performance function to constrain steady-state and transient-state performances of state variable tracking errors of the attitude loop and the angular rate loop of the flight vehicle, 3, converting the inequality constraints obtained in the step 2 into equality constraints so as to facilitate controller design, 4, designing a linear extended state observer, and obtainingan output estimation value and a total disturbance estimation value of each loop, and step 5, designing a controller, so that the tracking error of the system can be converged to a preset area underthe condition of facing input saturation constraints. According to the method, the design and parameter optimization of the linear active disturbance rejection controller of the hypersonic flight vehicle are realized, and the dynamic performance, the robust performance and the anti-interference performance of the hypersonic flight vehicle are improved.

The invention provides a six-degree-of-freedom chewing robot control system, and aims at solving problems that conventional point-to-point cubic polynomial interpolation is high in the required torque and relatively large in the required equipment size. Each chewing robot has problems of individual difference and symmetry of six driving rods due to the factor of machining accuracy of the robot so that consistent PID control parameters are difficult to obtain. The following scheme is adopted: step one: the movement tracks of each branch rod of the chewing robot are planned, telescoping of each driving rod is solved through the position and the posture of incisor points, and the expected position and speed of each driving rod are solved through a path passing point cubic polynomial interpolation method; and step two: the chewing process of the robot is controlled according to the movement tracks of each branch rod, and the chewing process includes three phases of opening, closing and occlusion; and fuzzy control is used in the opening and closing phases, and fuzzy PID control is used in the occlusion phase.

The invention belongs to the field of information retrieval and the technical field of its database structure, and discloses a revocable data sharing method based on fog calculation. When a user revocation occurs, it is not necessary to update the keys of other unrevoked users and re-encrypt the ciphertext, only the conversion key of the revoked user needs to be deleted; after the conversion key is deleted, the cloud server cannot perform partial decryption operations for the revoked user, thereby realizing the user's revocation. When an attribute revocation occurs, the keys of all affected users in the system needs to be updated and the ciphertext is re-encrypted to ensure that other users may still decrypt the ciphertext as usual. The invention realizes the data access control in the data network system, has the advantages such as high system access efficiency, low computational cost, and support for dynamic user rights management, and may be used for protecting the privacy data of the user in the data network, reducing the calculation cost of the user, and dynamically managing the authority of the user in the system.

The invention relates to an RFID security authentication method based on a physical unclonable function. The method realizes non-replicability of label data by utilizing the unique excitation response mapping mechanism of the physical unclonable function, and realizes freshness of shared secret values in an authentication period by introducing a dynamic updating mechanism. Targeted for the particularity and limitation of air interfaces of labels and reader-writers of an RFID system, the method utilizes an XOR operation and a unidirectional Hash function to effectively solve the problem of security data transmission of the RFID system. The method is practical and novel, and identity authentication is carried out by utilizing a lightweight cryptography operator, so that tamper-proofing performance of the label data is improved; and the method is suitable for RFID application scenarios having higher safety false-proofing demand.

The invention discloses a low-speed position-sensor-free vector control system and method for a surface-mounted permanent magnet synchronous motor. According to the invention, by using a high frequency pulsation square wave injection scheme that the injection frequency thereof is equal to the PWM switching frequency, and by combining with demodulation measures of double sampling and double updating and consecutive two deviation currents being subtracted, the separation of high frequency current response and fundamental current is realized, and finally, estimation information of the position angle and angular speed of a rotor are obtained. The obtained current bandwidth of the control system is higher, which is the same as that of the vector control system having a rotor position and without applying high frequency injection; thus, the dynamic performance of the system is ensured.

The invention discloses a continuous sliding mode zero current sensor control method of a DC voltage reduction converter. The method is based on a voltage reduction average state model, the continuous sliding mode control theory and a limited time observer are utilized to design a composite continuous controller, a reference input voltage can be precisely tracked by the voltage reduction converter even under the condition of having no current sensor, system hardware cost is reduced, system fault tolerance is improved, moreover, interference of a converter system caused by parameter perturbation, input voltage fluctuation and load abrupt change can be further estimated through the limited time observer, and anti-interference capability of the system is improved. The reference voltage can be precisely tracked by the designed zero current sensor composite controller even when the DC voltage reduction converter is under the conditions of parameter perturbation, input voltage fluctuation and load abrupt change. The method is advantaged in that a sliding mode shivering phenomenon can be eliminated through the proposed composite controller, and a closed loop system is made to have an excellent response speed and anti-interference capability.

The invention discloses a motor fault-tolerant control method and device. The method includes the following steps: collecting non-fault five phases of currents of a six-phase motor in a current sampling period, and converting the five phases of currents into five current components under a decoupled coordinate system; using a mathematical model of the motor and the five current components to predict the phase current value of each phase of the motor in the next sampling period, and predicting the optimal voltage vector output by a motor controller in the next sampling period according to the instruction value of each phase of current; converting the optimal voltage vector into five voltage components under the decoupled coordinate system, and limiting the amplitude of a voltage vector synthesized from a-axis and d-axis voltage components; and transmitting the a-axis and d-axis voltage components after amplitude limiting back to a phase coordinate system, converting the final optimal voltage vector into the duty ratio per phase, and adjusting the drive signal of each phase of voltage according to the duty ratio per phase to drive the motor. The phase current harmonic of the six-phase motor under the open-circuit fault tolerance condition of one phase of winding is significantly reduced while the dynamic performance of the motor is not affected.

The invention discloses a bionic microporous noise-reducing structure which is used for an oil fume extraction system. The structure comprises a shell body; oil fume passes by the inner cavity of the shell body and contacts with the inner wall of the shell body; the invention is characterized in that the outer side of the shell body is fixedly provided with a noise-reducing box which is enclosed at the periphery; the noise-reducing box is internally provided with at least one layer of porous plate which is distributed with tight millipores, so the noise-reducing box is divided into at least an inner cavity and an outer cavity; the shell body which is opposite to the porous plate and enclosed in the noise-reducing box is coated and distributed with an oil-preventing coat, moreover, bar-shaped pores are tightly distributed on the shell body; the inner cavity of the shell body is communicated with the inner cavity of the noise-reducing box by the bar-shaped pores, moreover, the bar-shaped pores are slits of louver window type and the vanes of the slits are self-locked. The invention uses a principle of fluid mechanics for effectively preventing the oil fume from blocking the millipores at places such as cochlear duct, air exhaust pipe and the like, finally ensures that the noise-reducing box can effectively achieves the aims of long-term sound absorption and noise reduction, and is especially suitable for household oil fume extraction machine.

The invention relates to a quick measurement method for a blade curved surface, belonging to the field of blade measurement. The method comprises the following steps: firstly determining endpoints of the maximum deflection region of section lines and geometric sensitive positions of front and back edges; planning a measurement curve of an axial direction of a blade; calculating measurement points of the axial curve by virtue of a curve approximation method so as to further determine the measurement section of the blade; partitioning the region according to the drastic characteristic of the curvature of the section line; quickly extracting the measurement points of the section line by virtue of double rules of the curvature and Hausdorff distance; and planning a measurement point set of each section line. The method has the advantages that the measurement of the blade curved surface is carried out by applying the method, so that the quantity of the measurement points is greatly reduced, and the measurement efficiency of the blade is remarkably improved on the premise of ensuring the precision of the profile of the blade.

The invention discloses a motor speed regulation control method and system. According to the method, based on power side stator flux orientation, a dual-closed-loop cascading structure of a rotary speed, a reactive power outer ring and a control side stator current inner loop is established by simplifying a mathematical model; influence from a current cross coupling item is counteracted through feedforward control; and decoupling control on the speed and reactive power of a brushless doubly-fed induction motor is realized; meanwhile, by adopting a phase-locked loop design thought, a power side stator flux observer is configured to obtain information of amplitude value, frequency, phase angle and the like of the stator flux so as to complete coordinate transformation of related electric quantity; by adoption of the method, dependency on parameter is low; the decoupling control on electromagnetic torque and reactive power can be realized; the static performance of a speed regulation system of the brushless doubly-fed induction motor can be ensured while high dynamic response performance also can be ensured under sudden change conditions of load and speed; and in addition, the technical scheme is simple to realize, low in calculated quantity and low in parameter dependency.

The present invention relates to an improved specified sub-harmonic current compensation control method for an active power filter. Based on the harmonic current control of a conventional shunt activepower filter with extracted each sub-harmonic current as a harmonic current command, the PI closed-loop control on each sub-harmonic current is carried out. At the same time, after a fundamental wavecurrent command value and a harmonic wave current command value are superimposed, a switch signal of a power switch tube is obtained through a deadbeat controller, the tracking of harmonic command current is achieved, thus the high accuracy compensation of specified sub-harmonic current can be ensured, and the dynamic performance of the system can be ensured.

The invention provides a railway container vehicle and a chassis for the same. The chassis comprises two fish-bellied side beams, air guide portions, end beams, small crossbeams and sleeper beams, the side beams are arranged in a spaced and parallel manner, one sides, close to each other, of the side beams are inner sides while one sides, away from each other, of the same are outer sides, the air guide portions are arranged at air facing faces of the side beams, the end beams are arranged on the end portions of the side beams, two ends of the small crossbeams are connected with the side beams in a one-to-one correspondence manner, two ends of the sleeper beams are connected with the side beams in a one-to-one correspondence manner, and the sleeper beams are positioned between the small crossbeams and the end beams. By arranging the air guide portions on the side beams, when the chassis runs, incoming air on the air facing faces of the side beams is guided away by the air guide portions, so that running air resistance of the chassis is reduced effectively, traction power load is reduced effectively, energy resource waste is avoided, traveling safety is guaranteed, and running stability of the chassis is guaranteed.

The invention discloses a railway nonstandard container transportation flatcar. The railway nonstandard container transportation flatcar comprises an undercarriage and a container locking apparatus, wherein the undercarriage is a bearing structure which is integrally in a fish bone shape and obliquely symmetric relative to a middle beam, the container locking apparatus arranged on an end beam is a non-telescopic rotary structure and is fixedly connected onto a rotary lock seat of the end beam, and the container locking apparatus arranged on a large crossbeam assembly is a telescopic rotary structure and is assembled in a rotary lock seat assembly consisting of a large crossbeam. By adopting a full-steel welding oblique symmetric bearing structure, on the premise of not reducing the overall rigidness of the undercarriage, the weight of the car body steel structure is reduced, so that a vehicle has greater bearing capacity, and the transportation benefit of the vehicle is improved; meanwhile, by combining the container locking apparatus of a non-telescopic rotary structure and the container locking apparatus of a telescopic rotary structure, the overall reliability and safety of the car after the container is loaded can be greatly improved; and moreover, the loading and unloading operation is simple, and the loading and unloading efficiency can be greatly improved.

The invention discloses an MBOM increasingly receiving method with integration of design, production and management, belonging to manufacturing process list MBOM receiving methods. The method comprises the analysis of information change situation, the division of data processing stages and the manufacturing process list MBOM increasingly receiving. The receiving method can not only realizes the increasingly receiving of data, but also ensure the dynamic property of the production plan and the consistency of the data, thereby truly realizing the process integration among systems.

The invention discloses a wind driven generator gearbox optimal design method based on the multi-body multi-force dynamics. The method comprises the following steps: S01, establishing a wind driven generator transmission chain dynamic model, wherein parts in a gearbox adopt flexible bodies for modeling; S02, conducting dynamic analysis on the established wind driven generator transmission chain dynamic model, screening and checking the resonant frequency of the parts in the wind driven generator gearbox, and if the resonant frequency exists, executing the next step; S03, conducting optimal design on the parts, corresponding to the resonant frequency, of the gearbox, wherein the low-order modal frequency of the parts of the gearbox is adjusted through the modification of the size or structure of the corresponding parts of the gearbox; S04, circularly executing the step S01 to S03 until the resonant frequency of a transmission chain is eliminated. The wind driven generator gearbox optimal design method based on the multi-body multi-force dynamics has the advantages that the principle is simple, the operation is simple and convenient, and resonance vibration can be avoided.

The invention discloses a fault-tolerant field-oriented control method for non-adjacent two-phase short circuits of a five-phase permanent magnet-embedded fault-tolerant linear motor. Non-fault-phase fault-tolerant current is calculated according to the principles that pre- and post-fault traveling wave magnetomotive force is constant and the sum of non-fault-phase current is zero; a nonlinear strong coupling system of the motor in a fault state is converted into a first-order inertia system by employing an internal model controller, a first-order inertia feedforward voltage compensator and a counter electromotive force observer; non-fault-phase voltage commands are calculated on this basis and the voltage commands and counter electromotive force of various phases are added respectively to achieve fault-tolerant field-oriented control on the non-adjacent two-phase short circuits of the motor. Motor output thrust fluctuation caused by the non-adjacent two-phase short circuits of the motor is inhibited; fault-tolerant operation that one of the non-adjacent two phases is in an open-circuit fault and the other one is in a short-circuit fault can be achieved; more importantly, the dynamic property and the steady-state performance of the motor are consistent with those in a normal state; and a voltage source inverter is constant in switching frequency and has certain universality.

The invention discloses a five-phase permanent magnet embedded fault tolerant linear motor adjacent two-phase open circuit fault tolerant vector control method. Based on the principles that the magnetic motive force of traveling waves remains unchanged before and after a fault occurs and that the non-fault phase current sum stays at zero and taking the equality of the non-adjacent two-phase current amplitude as a constrained condition, the non-fault phase fault tolerant current is obtained to further deduce the generalized Clark transform matrix from the natural coordinate system of the non-fault phase to the two-phase stationary coordinate system. The non-fault opposite potential is observed by the transpose matrix of the transform matrix. A current internal model controller, a first-order inertial feed-forward voltage compensator and a counter-electromotive force observer are used to convert the nonlinear close coupling system of such motor under the condition of an adjacent two-phase open-circuit fault into a first-order inertial system. According to the invention, not only the thrust fluctuation caused by motor failure is restrained, but also more importantly, the dynamic performance and the steady-state performance are consistent with those under a normal condition to realize the fast response to non-overshoot and the stable switching frequency of a voltage source inverter.

The invention provides a rudder jitter suppression circuit and a rudder system. The rudder system includes a feedback circuit as well as an adder, a signal amplifying and conditioning circuit, a jitter suppression circuit, a signal processing and power amplifying circuit and a servo rudder which are connected with one another sequentially; the input end of the feedback circuit is connected with the output end of the servo rudder; the first input end of the adder is used for receiving external rudder control signals; the second input end of the adder is connected with the output end of the feedback circuit; and the jitter suppression circuit includes an amplifier, a first one-way conduction element, a second one-way conduction element, a capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. With the rudder jitter suppression circuit and the rudder system of the invention adopted, interference signals can be effectively filtered out, and at the same time, self-excited oscillation of a resistance-capacitance circuit at the input end of the circuit can be greatly suppressed, which can well suppress the jitter of a rudder in a large-inertia rudder system having high bandwidth requirements, and therefore, the stability of the system can be ensured.

The invention provides recyclable epoxy resin and a preparation method. A polyamine curing agent with a dynamic imine bridging bond structure is synthesized and performs cross-linking curing on epoxyresin, and novel epoxy resin with recycling property is obtained. The method has universality for different kinds of epoxy resin, reaction conditions are mild, a preparation technology is simple, no additives are required during recycling, furthermore, on the basis of the heat exchange reaction of imine bonds, better recycling can be realized under the air hot-press condition, and most mechanicalproperties are reserved after repeated cycles, so that the problems of environmental pollution and resource waste caused by waste high polymer materials are effectively solved.