61results about How to "Meet the actual requirements of the project" patented technology

The invention discloses a permanent magnet synchronous motor direct torque control method based on model predictive control, and belongs to the technical field of control. The invention aims to provide the manent magnet synchronous motor direct torque control method based on model predictive control, wherein by means of an electric vehicle wheel hub motor drive control method based on extended Kalman estimation and model predictive control, the defects in the prior art can be well overcome. According to the permanent magnet synchronous motor direct torque control method based on model predictive control, firstly, an extended Kalman principle is used for completing motor drive system estimator designing, secondly, torque and flux linkage values obtained by the estimator are used as feedbackvalues which are transferred to a motor control system controller along with reference set values, and finally, by solving an optimum control problem corresponding to a target function, fast accuratetracking control of motor torque and flux linkage is completed by the system. By means of the permanent magnet synchronous motor direct torque control method based on model predictive control, the problems of complex coordinate change and current magnitude coupling in a motor model are effectively solved, the system complexity is reduced, and dynamic response speed of the system and the intuitionism and the reliability of a system control effect are improved.

The invention discloses a multifunctional ice or snow melting pavement test device and an evaluation method.The multifunctional ice or snow melting pavement test device is characterized in that a sealed case used for establishing a test environment is arranged; a test platform is arranged inside the case, a test piece to be tested is put on the test platform, and an ice or snow tank is arranged on the top of the test piece to be tested; an ice or snow pipeline is additionally arranged and used for putting ice or snow into the ice or snow tank; the test piece which is to be tested and used for simulating an ice or snow melting pavement is provided with a lower pavement layer, a middle heating layer and an upper pavement layer in a layered mode; a concrete precast element is adopted as the middle heating layer and provided with hole channels in an array mode, and strain pieces stick to the hole walls of all the hole channels; heating elements are put into the hole channels at set positions, heating holes are formed, and concrete rods are put into the hole channels without the heating elements to fill the hole channels.According to the multifunctional ice or snow melting pavement test device and the evaluation method, simulation tests of the deicing or snow melting process can be conducted according to different working conditions and pavement structures and different deicing or snow melting modes, the ice or snow melting efficiency and speed and the fatigue life are obtained, an optimal scheme is obtained by means of evaluation to the ice or snow melting pavement, and therefore the ice or snow melting pavement can be better applied.

The invention relates to a structure and process integrated design method for an FRP structural part. The structure and process integrated design method for the FRP structural part comprises the stepsof: (1), establishing a finite element model of the FRP structural part, performing parameterization of layer angle and layer thickness design variables, and establishing a material interpolation model; (2), performing finite element analysis on the structural part, extracting parameters required for calculating the sensitivity, and establishing a target function and a constraint condition on layer angle and total thickness design variables; (3), calculating the sensitivity of the target function and the constraint condition; (4), according to the sensitivity, iterating to obtain the optimalsolution of the target function by adopting a mathematical programming method, and updating a parameterization model of the layer angle and total thickness design variables; and (5), repeating the steps (2) to (4) till the result is converged or is up to the maximum iteration number, so that the optimal layer structure of the FRP structural part is obtained. Compared with the prior art, the structure and process integrated design method for the FRP structural part in the invention has the advantages that: structure and process integrated design is realized; and, on the premise that performancerequirements and manufacturing constraints are satisfied, the material utilization rate and the optimization design efficiency of the FRP structural part are effectively increased.

The invention discloses a flow regulating device for a boiler superheater or a reheater distributing header branch pipe. The flow regulating device comprises a main header body, an inner sleeve and an importing pipe, the inner sleeve is arranged in a cavity of the main header body, the outer wall of the inner sleeve and the inner wall of the main header body form an annular cavity, a plurality of through holes are reserved in the sleeve wall of the inner sleeve, the left end of the inner sleeve is blocked at the left end of the main header body through a left sealing connecting unit, the right end of the inner sleeve is blocked at the right end of the main header body through a right sealing connecting unit, the importing pipe is in butt joint with the left end of the inner sleeve, the importing pipe after being in butt joint is communicated with the inner sleeve, superheated steam from the superheater or the reheater is imported into the inner sleeve by the importing sleeve and is imported into a branch pipe after being secondly distributed in the annual cavity formed by the inner sleeve and the main header body so as to regulate flow in the branch pipe. The flow regulating device can regulate steam flow from the branch pipe according to running condition of utility boiler heated wall temperature.

The invention provides a blasting lumpiness measuring method based on photogrammetry and a particle contact theory, which comprises the following steps: Step 1, randomly selecting a rock sample from the blasted pile rock, and filling at least three containers; Step 2, vibrating and compacting the rock samples to form a test piece container; Step 3, respectively photographing the side surface of each test piece container to obtain a side surface projection image of the rock sample, and selecting a geometric characteristic parameter for measuring the rock lumpiness; carrying out lumpiness statistics on the particle size range to be solved to obtain the rock lumpiness condition; Step 4, measuring the void volume of the rock in each test piece container, and calculating the corresponding voidratio and the volume of the rock; Step 5, establishing a relation curve N1 between the void ratio and the rock lumpiness; and Step 6, establishing a relation curve N2 between the rock volume and the void ratio, then predicting the void ratio of the blasted pile rock under the same vibration compaction condition after blasting according to the total volume of the rock before blasting based on the curve N2, and estimating the rock lumpiness of the blasted pile rock according to the curve N1.

The invention discloses a triaxial micromachine accelerometer static correction method based on particle swarm optimization. The method includes the steps that a triaxial MEMS accelerometer and a relevant peripheral circuit are welded to a designated circuit board to form a test and using circuit of the accelerometer, and normal operation and data output of the accelerometer are guaranteed; the circuit board is fixed to a certain space point, and the circuit board can be freely rotated on three axial directions of space; the circuit board provided with the accelerometer is manually or automatically driven by an external device to rotate in the space, the rotating speed is smaller than 10 degrees per second, the rotation track of the accelerometer covers main distribution of a spherical surface, and actual output data of the accelerometer are recorded; after the collected data are preprocessed, an error estimation algorithm of the accelerometer is designed according to a standard PSO processing method; an error correction model of the accelerometer is set according to the estimated error model, and measurement accuracy of the accelerometer is improved. By the adoption of the method, random errors in the sampling process are effectively eliminated, and measurement accuracy of the MEMS accelerometer is further improved.

The invention discloses a low-noise power capacitor using damping steel plates. The low-noise power capacitor comprises a capacitor shell, a core, a casing, and a sound insulation cavity. The casing is arranged on the top of the capacitor shell. The core is arranged inside the capacitor shell. The sound insulation cavity is arranged at the bottom of the capacitor shell. The sound insulation cavity is a closed cavity structure composed of inner and outer steel plates. A damping material is arranged between the outer steel plate and the inner steel plate to form a three-layer closed cavity structure. By making use of low density, sound insulation, noise reduction, vibration absorption, high strength, high specific rigidity and other advantages of the damping steel plates, vibration at the bottom of the power capacitor can be reduced. The closed cavity formed by welding the damping steel plates is used to insulate sound in the main contribution frequency band of noise, so that vibration at the bottom of the power capacitor is reduced, and actual engineering requirements are met.

The invention discloses a crystal cultivation process environment vibration influence quantitative and rapid assessment method. The method comprises the steps that 1, the first three order vibration mode frequencies f1, f2 and f3 of a crystal cultivation structure are obtained; 2, a vibration response allowable target [R] of the crystal cultivation structure is determined according to process design of the crystal cultivation structure; 3, the environment vibration excellent frequency band center frequency fL is tested; 4, on the condition that the first two order vibration mode quality accumulation participation coefficient is larger than 80%, whether f3 / f1>10 and f3 / f2>10 are met or not is judged, and if yes, the step 5 is executed; 5, whether (f1-fL) / fL<0.05 is met or not is judged, andif yes, the step 6 is executed; 6, a single degree-of-freedom single particle power model response value RS, double degree-of-freedom single particle power model response values R[D, x] and R[D,y] are calculated, an x direction vector, a y direction vector and a maximum response value RD are judged, and the RS and the RD are compared to take the maximum value; 7, the maximum value in the RS and the RD is smaller than [R] or not is judged, and if yes, it is judged that the vibration environment does not affect crystal cultivation equipment.

The invention relates to a method for identifying parameters of a space target under double-arm capture based on a kinetic model. The method comprises the steps of taking a combined multi-rigid-body system as an object, wherein the combined multi-rigid-body system is formed by a space debris active removal aircraft provided with a double-mechanical-arm system and a space non-cooperative target captured by double mechanical arms; firstly, establishing a dynamical model of a combined spacecraft system and a central platform attitude kinematical equation after capturing a space non-cooperative target, wherein the dynamical model of the combined spacecraft system comprises a translation equation, a rotation equation and a mechanical arm rotation equation of a central platform and a rotation equation of a to-be-identified body; obtaining the acceleration, the posture, the angular velocity and the angular acceleration of the central platform and the rotating angle, the rotating angular velocity and other information of each section of connecting rod of each mechanical arm through sensor measurement; according to a central platform rotation equation in the system dynamics model, deriving and sorting forms, and exporting an identification equation; and finally, on the basis of a least square algorithm, identifying and estimating quality characteristic parameters of the to-be-identified body.

The invention discloses a method used for navigating a CEO satellite to disorbit, which comprises the following steps: (1), ensuring the working condition of disorbited satellite equipment, and propellant residual condition of the satellite prior to disorbiting; (2), ensuring the satellite disorbiting scheme according to the working condition of disorbited satellite equipment and the propellant residual condition; (3), specifying the performance of a thruster used for the disorbiting of the satellite according to the satellite disorbiting scheme; and (4), utilizing the satellite disorbiting scheme implemented by the thruster used for the disorbiting of the satellite, and carrying out inactivation operation for the disorbited satellite after the completion of the disorbiting of the satellite. According to the method provided by the invention, the operation and requirements for navigating the CEO satellite to disorbit are given, so as to ensure the CEO satellite to enter an abandoned orbit after the service life of the satellite ends.