350results about "Mechanical oscillations control" patented technology

The invention relates to the technical field of vibration and noise control, discloses a new energy automobile motor high-frequency vibration and noise active suppression system and method, and aims to solve the problems of poor high-frequency vibration and noise suppression effect, real-time performance, adaptive capacity and system cost complexity of an existing new energy automobile motor. The method comprises the following steps: acquiring and preprocessing motor operation state data, extracting high-frequency harmonic characteristics, and generating predicted harmonic characteristics in combination with working condition prediction; and superposing the self-adaptive compensation quantity to a motor voltage instruction, and driving an inverter through pulse width modulation to realize active suppression of high-frequency vibration and noise. The system comprises a data acquisition preprocessing module, a harmonic feature extraction module, a working condition sensing prediction module, a self-adaptive compensation quantity generation module and a pulse width modulation correction module. By the adoption of the technical scheme, efficient, real-time and self-adaptive suppression of high-frequency vibration and noise of the motor can be achieved, the level of the high-frequency vibration and noise is remarkably reduced, the driving comfort is improved, and the complexity and cost of the system are optimized.

The invention discloses a gravimeter active vibration isolation control method, and belongs to the technical field of gravimeter active vibration isolation, and the control method comprises the steps: S1, presetting a three-axis acceleration sensor and a gravimeter bearing platform, and detecting a space vibration signal of the gravimeter bearing platform in real time through the three-axis acceleration sensor; s2, the signal processing unit performs frequency domain decomposition on the space vibration signal; s3, establishing a feedforward control unit, a feedback control unit and a synthesis unit; s4, a multi-degree-of-freedom actuator is preset, and reverse compensation force is applied in the X-axis direction, the Y-axis direction and the Z-axis direction through the multi-degree-of-freedom actuator according to the composite control signal; and S5, the preset state monitoring unit samples the vibration suppression rates in three continuous sampling periods. The high and low frequency vibration components are dynamically divided according to the frequency-band energy accumulation proportion, the vibration interference model is established in combination with the high and low frequency vibration components, and compensation failure caused by model mismatch under complex working conditions is avoided.

The invention relates to the technical field of signal processing, in particular to a high-speed unmanned aerial vehicle structure servo elastic coupling vibration suppression control method, system and device, a medium and a program product. Obtaining a target control loop causing resonance; spectral analysis is carried out, and double-center frequencies causing resonance are obtained; a cascade wave trap with double center frequencies is designed; and the servo elastic coupling vibration of the unmanned aerial vehicle structure is suppressed. According to the method, the problems of difficulty in structure modification, narrow notch frequency range and large low-pass filtering delay of an existing structure servo elastic coupling resonance solving method are solved, the performance of a control system cannot be reduced, and the flight safety is ensured.

The application discloses a damping device and a damping method, which combines a friction generator with a damping component, so that the friction generator outputs an electric signal under the action of an external vibration source, and when the electric signal is transmitted to the damping component, the electric signal can adjust the inherent frequency of the damping component itself, so that the adjusted inherent frequency is different from the vibration frequency provided by the external vibration source, so that the damping component and the external vibration source cannot achieve resonance, thereby achieving the purpose of damping; and since the electric signal is provided by the friction generator, an external excitation power supply is not needed, the dependence on the external excitation power supply is reduced, and passive damping is achieved; in addition, the damping device does not need a complex structure, and only needs to combine the friction generator with the damping component to achieve damping, so that the structural complexity of the damping device is effectively simplified, the manufacturing cost of the damping device is reduced, and the manufacturing efficiency of the damping device is improved.

The invention discloses a multi-stage flexible load vibration suppression method and system, industrial equipment and a storage medium, and relates to the technical field of motor control, and the multi-stage flexible load vibration suppression method comprises the steps: carrying out the recursion processing of an initial rotating speed and an initial torque through vibration suppression parameters corresponding to a multi-stage flexible load, and obtaining a multi-stage flexible load vibration suppression parameter; generating a target rotating speed and a target torque; generating a position feed-forward instruction, a rotating speed feed-forward instruction and a torque feed-forward instruction according to the target rotating speed and the target torque; and industrial equipment is controlled according to the position feed-forward instruction, the rotating speed feed-forward instruction and the torque feed-forward instruction. The technical problem that an existing flexible system vibration suppression scheme is poor in scene adaptability is solved.

The invention relates to a vibration excitation method and system based on impedance identification, and the method comprises the steps: carrying out the frequency domain conversion of force-speed data obtained by a displacement closed-loop system, and obtaining the mechanical impedance of a drive point; performing flexibility compensation on the mechanical impedance of the driving point to obtain the real impedance of the structure end; extracting an imaginary part and constructing a matching residual error by using the real impedance of the structure end, correcting the excitation frequency of the current vibration exciter through gradient frequency, and iteratively determining the optimal excitation frequency of the vibration exciter meeting a convergence condition; mechanical active power generated by the vibration exciter is calculated under the optimal excitation frequency, dual-target optimization is carried out on the amplitude of the vibration exciter, and the optimal amplitude with the maximum mechanical active power and the minimum equivalent output of the actuator is obtained; based on the real impedance of the structure end, the matching criterion and the optimal amplitude, variable parameters are introduced to construct a source-side impedance model, a source-side impedance matching frequency domain interval is expanded through slow time mark setting parameters, and mechanical active power generated by a vibration exciter is coupled to a tested structure.

The invention relates to a method and a system for adaptively adjusting vibration compensation of an unmanned aerial vehicle based on a multi-band IMU (Inertial Measurement Unit), and the method comprises the steps: W1, in the process that the unmanned aerial vehicle executes a flight task, cooperatively collecting data information of vibration signals of an unmanned aerial vehicle structure based on a plurality of airborne vibration detection IMU arrays, and constructing an unmanned aerial vehicle vibration spectrum analysis model, and calculating the body dominant vibration frequency of the unmanned aerial vehicle to obtain the data information of the body dominant vibration frequency of the unmanned aerial vehicle, and optimizing the acceleration and angular velocity of the unmanned aerial vehicle by adopting an improved weighted average optimization algorithm based on dynamic fusion weight to obtain the optimized data information of the acceleration and angular velocity of the unmanned aerial vehicle. According to the method, the problem of measurement distortion of a single IMU in a resonance frequency band is effectively avoided, it is ensured that high-fidelity inertial data can be output under all working conditions such as low-frequency maneuvering, intermediate-frequency cruising and high-frequency disturbance, and the method can be deployed on a mainstream unmanned aerial vehicle platform and has good popularization value.

The invention relates to the technical field of vibration suppression, and discloses a multi-physics field cooperative control intelligent vibration suppression method and system, and the method comprises the following steps: S1, building a multi-physics field digital twinborn model based on a finite element analysis method, the multi-physical field at least comprises a coupling relationship among a pneumatic field, an electromagnetic field and a structural field, and the modeling of the fluid-structure interaction effect is included; and S2, based on the digital twin model, an improved particle swarm optimization algorithm is adopted to generate a control weight distribution scheme, and the control weight distribution scheme is used for dynamically adjusting the output proportion of a pneumatic actuator and an electromagnetic actuator. According to the method, the multi-physical field digital twinborn model containing the coupling relation of the pneumatic field, the electromagnetic field and the structural field and taking into account the fluid-solid coupling effect is established, so that the problem that the control precision is limited due to the fact that a single physical field control strategy is mostly adopted in a traditional vibration suppression method is solved.

The invention discloses a resonant frequency tracking control method and system for a diamond nitrogen vacancy color center, and belongs to the technical field of quantum sensing. The method comprises the following steps: setting an initial center frequency output by a microwave source; in the tracking control process, fluorescence signal changes generated by the diamond nitrogen vacancy color center under the microwave frequency modulation effect are recorded, a full-amplitude demodulation amplitude value R is obtained through demodulation, and whether the full-amplitude demodulation amplitude value R is smaller than a dead zone threshold value or not is judged; if yes, the center frequency output by the microwave source is not changed; if not, calculating the microwave frequency regulation quantity delta f according to the full-amplitude demodulation amplitude R; determining the adjusting direction of the center frequency f0 of the microwave source according to the phase-frequency characteristic and the real-time demodulation phase difference delta phi in the current frequency tracking control process; according to the microwave frequency adjusting quantity delta f and the adjusting direction, the center frequency of the microwave source is adjusted for resonant frequency tracking; wherein the phase-frequency characteristic is the characteristic of the demodulation spectral line on the two sides of the resonant frequency. The robustness and the accuracy of the resonance frequency tracking method are enhanced.

The invention provides a die cutting equipment error optimization method and system based on group collaboration, and relates to the technical field of die cutting machines, and the method comprises the steps: carrying out the spectrum analysis of a frequency characteristic curve of each piece of die cutting equipment, so as to divide an initial interference group; establishing a virtual spring damping network in the initial interference group, regarding each die cutting device in the initial interference group as a mass point, and determining a spring stiffness coefficient and a damping coefficient according to an actual distance between adjacent mass points; determining vibration mode characteristics of each die cutting device according to the spring stiffness coefficient and the damping coefficient, and converting a control signal generated according to the vibration mode characteristics into a parameter adjusting variable by using a preset control algorithm; and determining a vibration coupling relationship according to the collected vibration energy data of the initial interference group after the initial processing parameters are adjusted according to the parameter adjusting quantity, and determining an optimal production takt and a parameter compensation value according to the vibration coupling relationship. The technical problem that in the prior art, due to vibration coupling of a die cutting equipment group, the machining error cooperative control difficulty is large is solved.

The invention discloses a ship low-frequency active control system and method based on an intelligent material and an adaptive algorithm, and relates to the technical field of ship vibration control. The remote monitoring management platform is in communication connection with an intelligent material layer module, a sensor network module, a self-adaptive controller module, a self-diagnosis module and a power supply module; the intelligent material layer module is used for sensing ship vibration by adopting an intelligent material and generating corresponding control force; the sensor network module is used for collecting ship vibration data in real time through sensors arranged at key parts of a ship. By integrating intelligent materials and a self-adaptive control algorithm, ship vibration can be sensed in real time, corresponding control force can be quickly generated, vibration can be effectively counteracted, and compared with a traditional passive control technology, the response speed is remarkably increased, the ship vibration can be responded in a shorter time, and therefore the safety and comfort of ship navigation are improved.

The invention belongs to the technical field of micro-vibration suppression, and particularly discloses an active vibration reduction control method and system based on multi-sensing information fusion, and the method comprises the steps: collecting a load vibration absolute speed signal, a load vibration acceleration signal, a relative displacement signal between a load and a base, and a base vibration absolute speed signal; based on the multi-sensing information fusion controller model and the collected signals, active control force is determined, and the active control force is used for counteracting vibration interference borne by the load; wherein the multi-sensing information fusion controller model is used for fusing output of a plurality of controllers to determine active control force; the controllers comprise a feedback controller used for processing load vibration absolute speed signals, a feedback controller used for processing load vibration acceleration signals, a feedback controller used for processing relative displacement signals and a feedforward controller used for processing base vibration absolute speed signals. According to the invention, the vibration suppression capability of the system can be greatly improved in a wide frequency domain range.

The invention belongs to the technical field of active vibration isolation, and particularly discloses an active vibration isolation method and system based on prediction and adaptive control. Comprising the following steps: carrying out multi-degree-of-freedom dynamic modeling on a vibration isolation system, taking the pose of a load as system output, taking the control quantity of an execution mechanism as system input, and uniformly expressing unknown dynamics caused by structural nonlinearity and disturbance as a nonlinear term; constructing an adaptive neural network state observer based on the kinetic model, and estimating a state which cannot be directly measured; the method comprises the following steps: acquiring historical operation data of a vibration isolation system, preprocessing the data, constructing an input time sequence and an output time sequence, and training a long-short-term memory neural network prediction model to generate a prediction signal representing future position information; and designing an adaptive control law according to the state estimation result and the prediction signal, obtaining a feedback control quantity, and superposing the feedback control quantity with a feedforward control quantity obtained based on the prediction signal to form a control instruction for driving an execution mechanism.

The invention relates to the technical field of broadband vibration control, in particular to a broadband vibration control method and device based on acoustic black holes and distributed vibration absorbers. The method comprises the following steps: constructing a three-dimensional model of the acoustic black hole, and importing the three-dimensional model of the acoustic black hole into finite element analysis software; design parameters of the distributed vibration absorber are defined, and a spring-mass-damping system model of a distributed vibration absorber unit is established; based on a collaborative tuning strategy of a gradient descent method, collaborative optimization is carried out on acoustic black hole and distributed vibration absorber parameters, and broadband vibration control is realized; based on a finite element analysis result, analyzing a transmission path and efficiency of energy between the acoustic black hole and the distributed vibration absorber by utilizing a mathematical model for analyzing vibration energy transmission and dissipation; a vibration signal of the acoustic black hole is collected through an acceleration sensor, and the broadband vibration control effect is verified. The design not only pays attention to the suppression of vibration energy, but also considers the energy dissipation efficiency and the lightweight demand of the system.

The invention discloses a control method for a magnetic suspension ORC waste heat generator set, and relates to the technical field of magnetic suspension ORC waste heat generator sets, and the method comprises the steps: obtaining the environment information data of the magnetic suspension ORC waste heat generator set, and judging the scene where the magnetic suspension ORC waste heat generator set is located; if the scene is a land scene, first control current of a magnetic bearing in the magnetic suspension ORC waste heat generator set is adjusted through a first adjustment strategy; and if the scene is the ocean scene, a second control current of the magnetic bearing in the magnetic suspension ORC waste heat generator set is adjusted through a second adjustment strategy different from the first adjustment strategy. The corresponding control scheme is automatically adjusted according to the field condition actually sensed by the unit, the current of the magnetic bearing is dynamically adjusted to maintain the optimal suspension gap of the rotor, the magnetic bearing is prevented from being overheated, the mechanical loss is reduced, the unit is always in an efficient operation interval, and it is ensured that the high conversion efficiency of converting waste heat into electric energy is still kept under the complex working condition.

The invention provides a seat safety vibration control system and method based on health state dynamic reasoning. The method comprises the steps that physiological signals of a user are collected; analyzing according to the collected physiological signals to obtain a user health state grading result and a corresponding seat vibration and environment control execution scheme; according to the seat vibration and environment control execution scheme, the angles and the heights of the seats in all directions are adjusted, and opening and closing and the amplitude of vibrators of all subareas on all the seats are independently controlled. The intelligent health cabin system breaks through the limitation of single function guidance of traditional seat vibration, constructs an intelligent health cabin system from health monitoring to safety control to continuous optimization, has safety, accuracy, compliance and user experience, can be widely adapted to users in different health states and pathological types, and meets the industry development requirements of health cabins.

The oscillator is controlled with high precision. [Solution] (b) an Arnold-Tan evaluation means having a sweep program that continuously or discretely scans injection points, measures the response of the oscillator at each injection point, and determines the most stable injection point; (c) a control means that calculates and sets injection parameters for the actuator based on the phase detection signal of the sensor and the evaluation, and controls the actuator based on a control law based on Arnold-Tan stability analysis; and (d) an optimization means that evaluates the vibration state after injection and dynamically optimizes the injection parameters based on the control effect.

The invention relates to the technical field of pump station gate control, in particular to a pump station gate control device which comprises a supporting body and dampers symmetrically arranged on the lower portion of the supporting body on one side of a gate and connected with the gate to be used for damping the gate. The actuators are symmetrically arranged on the lower portion of the supporting body on the other side of the gate, connected with the gate and used for controlling vibration of the gate, and the control execution assemblies are symmetrically arranged on the inner side wall of the gate track and used for enabling the dampers and the actuators to do reciprocating motion. The vibration frequency of the gate at the opening moment is compared with the preset frequency, a damping counteracting control mode or an actuator counteracting control mode is adopted, and the corresponding counteracting mode is automatically switched according to the vibration frequency. Compared with a single counteracting control mode, the effect of suppressing the vibration frequency of the gate can be effectively improved.

The present invention relates to a MEMS mirror arrangement, an optical projector, virtual reality or augmented reality glasses and a computer-implemented method for predicting an oscillation movement of a MEMS mirror with respect to a first oscillation axis.

The invention relates to a control method and device, terminal equipment, a storage medium and a computer program product. The control method comprises the steps that first vibration information generated when a vibration unit vibrates according to a first control signal is determined through a vibration information detection unit; wherein the vibration information detection unit at least comprises an acceleration sensor, a gyroscope and / or a displacement sensor; adjusting the first control signal according to the first vibration information and target vibration information to obtain a second control signal; wherein the second vibration information of the vibration unit, which vibrates according to the second control signal, approaches to the target vibration information or is the same as the target vibration information; and controlling the vibration unit to vibrate according to the second control signal. The method improves the energy density of the vibration unit and the efficiency of determining the vibration information of the vibration unit.

The present disclosure relates to a method and apparatus, equipment, and computer-readable storage medium for adjusting the frequency of a topological state, and relates to the field of engineering structure technology. The method comprises: using a piezoelectric sheet as a resonator, generating a target unit structure through the unit structure of the piezoelectric sheet and the target material; applying periodic boundary conditions to the target unit structure to obtain the band structure of the unit structure and the topological band gap in the band structure; using the target unit structure to generate a one-dimensional target system, setting a displacement excitation to the one-dimensional target system to obtain an excited topological state in the topological band gap; applying a voltage to the one-dimensional target system, and adjusting the excitation frequency of the excited topological state based on the voltage. The present disclosure realizes the control of the excitation frequency of the topological state by an external voltage while keeping the target material structure unchanged, thereby simplifying the operation and improving the flexibility of the system.

Systems and methods define a stimulation pattern for a juvenile product utilizing a mobile device that executes a mobile application that is linked to the juvenile product. The method comprises the step of recognizing, by the mobile device when executing the mobile app, the user-defined stimulation pattern for the juvenile product. The stimulation pattern can be a vibration pattern or a motion pattern, and can be detected in a number of different ways by the mobile device. The method further comprises the step of determining control signals for the actuator(s) of the juvenile product based on the user-defined stimulation pattern that is recognized by the mobile device. The method further comprises the step of, in response to receiving a command to execute the user-defined stimulation pattern, controlling the actuator(s) of the juvenile product based on the stored control signals for the user-defined stimulation pattern.

The application relates to a vibration error distribution and suppression method of an airborne suspension type light beam pointing mechanism, and belongs to the technical field of photoelectric detection. The method steps comprise the following: determining a shear frequency range of a servo system; judging whether the light beam pointing mechanism meets the requirements by adopting wide-frequency vibration excitation; recording frequency points of resonance and amplification rates corresponding to the resonance points by adopting wide-frequency vibration excitation; obtaining light axis jitter amounts generated by each frequency point of resonance by adopting fixed-frequency vibration excitation, and sorting the light axis jitter amounts according to the sizes of the light axis jitter amounts; placing the servo system in an open loop state, exciting the light beam pointing mechanism again, obtaining light axis jitter amounts generated by each frequency point of resonance, and sorting the light axis jitter amounts according to the sizes of the light axis jitter amounts; comparing the differences between the light axis jitter amounts obtained twice, judging the reasons for the light axis jitter, and compensating the vibration error of the light beam pointing mechanism. The application effectively improves the precision of the suspension type light beam pointing mechanism and improves the detection capability of photoelectric products.

The invention discloses a multi-degree-of-freedom staggered active vibration absorption method and system, photoetching equipment and a storage medium. The method comprises the following steps: acquiring vibration data; determining vibration state parameters of each degree of freedom at the current moment based on the vibration data; on the basis of the vibration state parameters, according to a preset interleaving control strategy, control instructions for a plurality of actuator units are generated; and driving the actuator unit to generate corresponding active damping force based on the control instruction. The embodiment of the invention aims to overcome the technical defects of potential instability, high energy consumption and poor time-varying disturbance adaptability caused by control resource competition in a traditional multi-degree-of-freedom active vibration control system, so that more stable, more efficient and more adaptive vibration suppression is realized.

The present application discloses a method, apparatus, system, computing device, and storage medium for suppressing liquid sloshing. The method includes: determining the immersion depth of a structure; if the structure moves in the liquid with an initial motion amplitude, detecting initial radiation waves based on a central detection unit; determining a preset distance between the structure and the central detection unit and an initial radiation wave height at the central detection unit based on the initial radiation waves; and establishing a mapping relationship between the immersion depth, the preset distance, the initial radiation wave height, and the initial motion amplitude; detecting wave data based on the central detection unit in the presence of external excitation in the liquid tank; determining a target radiation wave height at the central detection unit based on the wave data; determining a target motion amplitude of the structure based on the target radiation wave height and the mapping relationship; and controlling the movement of the structure based on the target motion amplitude so that the wall wave height at the side wall is within a target range. This method can improve the suppression effect of liquid sloshing in the liquid tank.

The invention discloses a vibration suppression and energy efficiency improvement method for a marine propulsion system, and belongs to the technical field of ship vibration control and energy efficiency optimizing.The method comprises the steps that vibration signals at a middle bearing, a propeller hub and a main engine base are collected, and three paths of filtering signals are obtained through band-pass filtering; front and rear flow velocity signals and main shaft rotating speed signals of a propeller are collected, and the ratio of the flow velocity difference to the rotating speed difference is calculated to obtain an energy efficiency coefficient; the three paths of filtering signals are multiplied by the energy efficiency coefficient to generate three paths of control signals, and the three paths of control signals are output to the three piezoelectric actuators to generate displacement amounts which act on a bearing shell, the inner wall of a propeller hub and a main engine base; when the propulsion shafting vibrates longitudinally, the metal push rod drives the coil to reciprocate between the permanent magnets to generate induced current, the induced current is stored in the storage battery after being rectified and supplied to the hydraulic controller to adjust the oil flow of the hydraulic cylinder according to a control signal, and graded suppression of multi-source vibration and recycling of vibration energy are achieved. And the vibration suppression effect and the energy efficiency level of the system are obviously improved.

The invention relates to the technical field of material forming, in particular to a vibration control system and method for particle directional arrangement in the graphite powder forming process, and the system and method achieve the time division multiplexing of vibration excitation and ultrasonic detection through a multifunctional vibration exciter array, a high-speed switching circuit and intelligent closed-loop control. The micro-state of the powder is sensed in real time with high resolution, and a targeted, multi-mode and locally adjustable composite vibration waveform is dynamically generated and applied according to diagnosis. According to the vibration control system and the vibration control method, the problems of sensing blind areas, passive excitation and sensing excitation disjunction of existing graphite powder forming are solved or at least relieved, sensing excitation disjunction is effectively overcome, and the precision, the efficiency and the robustness of particle directional arrangement are improved.

A method for active vibration control system (AVCS) monitoring and control is disclosed. The method comprises receiving inputs to a protection monitor to monitor one or more force generators, comparing the inputs to one or more values, and shutting down or adjusting the one or more force generators if the one or more force generators are determined to be operating at an undesired condition.

The application relates to a damping system, a method and a semiconductor manufacturing device, the system comprising a bottom plate and a top plate arranged in relative spacing and a damping support assembly arranged between the bottom plate and the top plate; the damping support assembly comprising a plurality of support legs, a plurality of slave cabinets, a master cabinet, a plurality of valves and a plurality of actuators; the plurality of support legs are used for supporting the top plate; the plurality of slave cabinets are used for respectively acquiring vibration data of the plurality of support legs; the master cabinet is used for integrating the vibration data of the plurality of support legs and determining overall vibration data of the damping system, and sending the overall vibration data to each slave cabinet; each slave cabinet is further used for determining a damping correction instruction of each support leg according to the overall vibration data and the vibration data; the plurality of actuators are used for damping adjustment of each support leg according to the damping correction instruction; for any large motion platform, any single point can be damped according to requirements.