36 results about "Active vibration control" patented technology

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.

A system and method for removing unwanted vibrational noise is provided. The system can detect, by one or more microphones of the system, at least one audio signal that includes audio content output from at least one speaker and audio data from one or more other sources or caused by the one or more other sources. The other audio data can include determined undesired vibrational noise that causes distortion of the at least one audio signal. The system can determine, by at least one sensor of the system, a subset of the other audio data based in part on determining at least one motion of a user of the system or motion of one or more other users. The system can remove or reduce the undesired vibrational noise from the at least one audio signal to enable output of sound associated with the modification of the at least one audio signal.

The application discloses an active isolation-passive damping-energy recovery integrated composite isolation wall, belonging to the field of rail transit, comprising a magneto-rheological damping unit, a linear motor displacement control unit, a passive vibration control module, a bottom support element, a top covering module and the like; the magneto-rheological damping unit guarantees controllable damping force of the magneto-rheological damping unit through the magneto-rheological effect of magneto-rheological fluid in a cavity, and actively controls the train track in real time; the linear motor displacement control unit accurately adjusts the system displacement, and realizes active vibration control; the passive vibration control module realizes efficient vibration energy attenuation through cooperation of various elements; the bottom support element provides bearing and stable support, and the top covering module has vibration monitoring and vibration energy conversion and protection functions. The isolation wall combines real-time adjustment of active control and energy dissipation of passive control, constructs a multi-stage vibration control strategy, adapts to different vibration environments, and improves the stability and safety of the rail system.

The application provides an active vibration control system and method. By collecting displacement, velocity and acceleration information of the lifting rod, the transverse moving rod and the overturning shaft, and synchronously collecting the amplitude of external vibration disturbance acting on the trolley structure; based on the connection mode of the trolley rod, the joint friction characteristics, the component inertia parameters and the coupling torque parameters between joints, a multi-degree-of-freedom mechanical model of the trolley is established or updated; the real-time state input of the state collection step is input into the mechanical model, the coupling vibration amplitude of each degree of freedom under the current disturbance is calculated, and vibration evaluation is performed; a multi-axis cooperative control algorithm is used to determine a set of coordinated control quantities for reducing the coupling vibration amplitude; the control quantities obtained in the control quantity generation step are output to the lifting rod, the transverse moving rod and the overturning shaft at the same time to drive the coordinated action of each degree of freedom to suppress vibration, so that the vibration amplitude of the corbel formwork trolley is kept within the preset vibration threshold.

The invention discloses an embedded active vibration control device and method based on a heterogeneous multi-core architecture, the core of the device is a heterogeneous multi-core processor, and the device comprises a real-time processing core and an application processing core; and respectively operating a real-time system and a universal operating system which are isolated from each other. The real-time system uninterruptedly executes core control tasks such as vibration signal acquisition, vibration suppression calculation and output at a fixed period; the general operation system is responsible for non-real-time functions such as human-computer interaction, communication and high-performance calculation; the two cores share data through an inter-core communication mechanism to realize function collaboration. Compared with the prior art, the hybrid key deployment architecture is adopted on the single heterogeneous multi-core processor, so that high-determinacy real-time vibration control and complex non-real-time function collaboration are realized, and the absolute reliability of a core control task is ensured.

The invention discloses a data driving type control method for vibration suppression of a flexible mechanical arm, and relates to the technical field of robot control, and the method comprises the following steps: constructing a feedback control system for vibration suppression at the tail end of the flexible mechanical arm, and taking periodic residual vibration collection information of a tail end vibration sensor as driving data; designing an adjustable feedback controller corresponding to the control system, and obtaining a feedback control system for realizing residual vibration minimization through adjustable parameter optimization of the adjustable feedback controller; a self-adaptive parameter optimization algorithm is developed to achieve the purpose of minimizing tail end residual vibration, and the developed algorithm carries out real-time optimization on a feedback controller based on driving data; the limitation of an existing active vibration control method is broken through, the tail end residual vibration can be effectively restrained only by depending on the real-time acquisition and measurement signals of the tail end vibration sensor of the flexible mechanical arm as driving data of the control system, and the complete data driving flexible mechanical arm vibration control method is achieved.

The invention discloses a vibration active control method based on a PPO-HAFxLMS algorithm, and relates to the field of vibration active control. The method comprises the following steps: determining a target vibration frequency band needing to be suppressed and a vibration attenuation standard so as to determine configuration of related hardware in the vibration active control system; capturing an external disturbance signal received by the controlled object; and on the basis of the time domain data of the external disturbance signal, a required control voltage signal is generated in real time by using a PPO-HAFxLMS algorithm, and vibration suppression is realized. According to the method, on the basis of a traditional FxLMS algorithm, a feedback channel is added to form a HAFxLMS algorithm, filter coefficients and step length updating are optimized through the HAFxLMS algorithm, the step length and the weight of a filter are dynamically adjusted according to the correlation between error signals and input signals and the change of the environment through a PPO reinforcement learning algorithm, and therefore the convergence speed and the steady-state error of vibration control are optimized, and the stability of vibration control is improved. And the vibration suppression effect is obviously improved.

This invention proposes a secondary channel modeling method for a vibration active control system based on a top-mounted rotor hub. The method includes: activating the actuator of the vibration active control system when the rotor hub is not rotating, outputting actuating forces in both directions. These forces serve as load inputs to the test bench. The actuating forces are transmitted via a path that sequentially passes through the rotor hub actuator mounting location, the collector ring, the shaft, the spring, and the base, ultimately reaching the vibration sensor mounting location. The vibration sensor collects the vibration response at this location, identifying the secondary channel transfer function matrix in the fixed state. The secondary channel transfer function matrix is ​​then substituted into the output force transmission relationship formulas for the fixed and rotating states to obtain the initial value of the secondary channel model in the rotating state. Using this initial value, an adaptive algorithm is used as the physical model for online identification of the secondary channel, enabling online modeling of the system's secondary channels under rotor hub rotation conditions. This method allows for online iterative construction of time-varying secondary channel models, resulting in high modeling efficiency.

The invention provides a flexible sailboard satellite active vibration control method and device for SADA disturbance, and belongs to the field of spacecraft attitude determination and control. The method solves the problem of stability caused by frequency drift in the prior art and the problem that the method depends on a satellite model and cannot adapt to a time-varying system. The method comprises the following steps: acquiring an SADA driving angle, an angular velocity of a fiber-optic gyroscope and voltage data of a piezoelectric sensor; performing discrete short-time Fourier transform on the voltage data to obtain an amplitude spectrum and a phase spectrum; identifying the frequency corresponding to the peak value of the amplitude according to the amplitude spectrum, and associating the SADA driving angle corresponding to the peak value with the angular velocity of the fiber-optic gyroscope; the stability of the whole satellite is judged according to the angular velocity of the fiber-optic gyroscope, and when the angular velocity exceeds a set threshold value, control parameters of the piezoelectric actuator are adjusted in a segmented mode; and iteratively executing the steps until the stability of the whole satellite meets the index requirement. The method is mainly used in satellite control field.

This invention discloses an interactive multi-model adaptive active vibration control method based on variational Bayesian methods, belonging to the field of vibration control technology. The method includes establishing a system model set containing multiple potential dynamic modes and initializing each model; performing variational Bayesian iteration on each model within each control sampling period; repeating the above process for each channel to obtain the optimal state estimate for each channel; fusing the state estimates of multiple channels using a covariance cross-fusion method to calculate the global optimal state estimate; convolving the global optimal state estimate with a reference signal filtered by the secondary channel model to generate an inverse control signal, which drives an actuator via a power amplifier to produce a secondary force that counteracts the original vibration, thus achieving vibration suppression. This invention achieves high-precision and highly robust vibration suppression by fusing variational Bayesian adaptive Kalman filtering with interactive multi-model estimation.

The application provides a stability test method for a helicopter hub top-mounted vibration active control system. The method comprises the following steps: determining a stability test item, wherein the stability test item comprises a constant-speed system stability test, a variable-speed system stability test, a dangerous-speed-range stability test and an actuator power-off stability test. The constant-speed system stability test is used to simulate a constant-speed working state of a helicopter hub and to check whether the hub top-mounted vibration active control system is stable. The variable-speed system stability test is used to simulate a variable-speed working state of the helicopter hub and to check whether the hub top-mounted vibration active control system is stable. The dangerous-speed-range stability test is used to obtain an inherent frequency of a coupled rotor system formed after the hub top-mounted vibration active control system is installed on a test device and to check whether the coupled rotor system is stable when passing through the inherent frequency. The actuator power-off stability test is used to simulate an actuator power-off fault and to check whether the hub top-mounted vibration active control system is stable. The method can effectively check the stability of the hub top-mounted vibration active control system.

The invention discloses a rigid-flexible coupling dynamics modeling method based on a rigid-flexible coupling spacecraft and application, and belongs to the technical field of spacecraft dynamics and control. The method comprises the following steps: S1, in a floating coordinate system, determining a deformation displacement vector of any point P on a neutral axis OBP of the flexible accessory; s2, determining a position vector and a deformation displacement vector of any point Q0 on the flexible accessory; and S3, constructing a rigid-flexible coupling dynamic model of the rigid-flexible coupling spacecraft. According to the method, a single-frame control moment gyroscope is used as a vibration suppression execution mechanism of a flexible accessory, and a rigid-flexible coupling dynamic model is discretized and then used for attitude control of a rigid-flexible coupling spacecraft and design of an active vibration control system. According to the method, an analysis basis and a dynamical model support are provided for efficiently suppressing the vibration of the large flexible structure of the spacecraft.

The application discloses a kind of multi-degree-of-freedom staggered active vibration absorption method, system, photolithography equipment and storage medium, the method comprises: obtaining vibration data;Based on the vibration data, the vibration state parameter of each degree of freedom at the current time is determined;Based on the vibration state parameter, according to the preset staggered control strategy, the control instruction for multiple actuator units is generated;Based on the control instruction, the corresponding active damping force is generated by driving the actuator unit.The embodiments of the present application aim to overcome the technical defects of potential instability, high energy consumption and poor adaptability to time-varying disturbance caused by control resource competition in traditional multi-degree-of-freedom active vibration control system, so as to realize a more stable, more efficient and more adaptive vibration suppression.

This invention discloses an active vibration control system and method for tiltrotor aircraft wings, comprising: an actuator assembly consisting of piezoelectric laminated actuators symmetrically arranged within the wing; acceleration sensors, including a wing acceleration sensor located at the outer end of the wing and a fuselage acceleration sensor located in the cockpit; and an adaptive control unit for acquiring sensor signals and outputting control commands. A dual-loop control and flight state tracking strategy is employed: the first control loop implements dynamic characteristic control for the wing-rotor system to suppress transient responses; the second control loop implements steady-state response control for the airframe structure to suppress steady-state harmonic vibrations at the rotor pass frequency and its integer multiples. The flight mode is determined based on the rotor speed and nacelle tilt angle, and the weights of the dual-loop control are dynamically adjusted. This invention achieves adaptive vibration suppression of the tiltrotor aircraft throughout its entire flight envelope, balancing transient and steady-state response control, improving flight quality and extending the lifespan of critical equipment.

The invention provides an active vibration control method and device for working condition switching of deep learning and reinforcement learning, and relates to the technical field of vibration control. The method comprises the following steps: aiming at a multi-channel active vibration isolation system, establishing primary and secondary channel models for each channel under different working conditions; constructing an interaction environment corresponding to the working condition, designing a state space, an action space and a reward function, and training to obtain an active vibration control strategy network of different working conditions; establishing a working condition classification network based on a sparse automatic encoder; and according to the collected monitoring data and the working condition classification network identification working condition, obtaining a corresponding active vibration control strategy network output control filter vector, calculating to obtain a control quantity, and realizing active vibration control. According to the method, the problem of control instability of the active vibration isolation system when the secondary channel fluctuates and the problem of control failure in a working condition switching scene are effectively solved, and control strategy self-adaptive matching without manual intervention of switching parameters is realized.

This invention relates to the field of attitude stabilization and active vibration control technology for tunneling machines, and discloses a magnetorheological active anti-instability and vibration suppression attitude stabilization system for a steep inclined shaft tunneling machine. The system includes an anti-roll bar assembly, a magnetorheological actuator, an attitude sensing unit, a vibration sensing unit, a drive unit, and a main controller. The main controller performs frequency domain decoupling filtering on the three-dimensional attitude signal and the three-axis vibration acceleration signal, separating the low-frequency reference attitude offset and the high-frequency vibration acceleration characteristic quantity, and calculating the anti-instability foundation support current and the vibration suppression damping compensation current respectively. It then calculates the control weights based on contact pressure data and weightedly fuses the two currents to generate a comprehensive target drive current. The drive unit adjusts the excitation current according to the comprehensive target drive current to change the apparent yield stress of the magnetorheological fluid. This invention reduces control interference in attitude stabilization support and high-frequency vibration reduction, and improves operational stability under complex conditions of steep instability.

The application provides a flexible mechanical arm active vibration controller, which has the structure comprising: a connecting plate, a main box, a control end, a power socket and a vibration monitoring body; the connecting plate is fixedly connected with the main box; the control end is embedded in the surface layer of the main box; the power socket is fixed at the upper end of the main box; and the vibration monitoring body is arranged at the lower end of the main box and is electrically connected; the main box is further improved, the wire spool cavity and the vibration assembly are separated by the internal classification assembly, the vibration assembly cannot contact the power supply wire of the wire spool cavity, the interweaving of the vibration assembly and the power supply wire is solved, the winding condition caused by the interweaving is solved, the winding shaft in the wire spool cavity can collect and wind multiple power supply wires on the surface layer, the power supply wires can be summarized, and the subsequent maintenance difficulty caused by the arbitrary accumulation is prevented.

The invention discloses an active vibration reduction control method for a range extender, and belongs to the technical field of new energy automobile power system control. The method comprises the following steps: S1, denoising an acquired engine torsional vibration signal; s2, according to the stroke number, the air cylinder number and the air cylinder arrangement mode of the engine, the order of the simple harmonic torque of the main harmonic quantity of the engine needing to be restrained is determined; s3, based on the denoised torsional vibration signal, extracting a simple harmonic torque of a main harmonic quantity corresponding to the order; and S4, according to the simple harmonic torque of the main harmonic quantity, active vibration reduction is achieved by controlling the output torque of a motor. According to the compact range extender, the defects of obvious vibration noise transmission and large DC input current fluctuation caused by direct connection of an engine and a motor of an existing compact range extender can be overcome.

The utility model discloses a kind of active-passive collaborative risk management and control vertical blocking barrier, for urban rail transit vibration control, comprising: magneto-rheological damping unit, through the magneto-rheological effect of magneto-rheological fluid in cavity, ensure that controllable damping force is generated to magneto-rheological damping unit, real-time active control is carried out to train track;Linear motor displacement control unit, lower surface is connected with gyro wheel track through gyro wheel, displacement state information is obtained through displacement sensor, utilize electromagnetic force to drive gyro wheel track accurate displacement adjustment compensation external disturbance, active vibration control is carried out;Passive vibration control module, passive vibration control is carried out through flexible material damping and rigid material vibration isolation. The utility model blocking barrier adopts the integrated design of multi-directional space hinged and rigid connection, flexible damping combination, combined with the real-time adjustment of active control and the energy dissipation of passive control, different vibration environment can be adapted, the stability and safety of urban rail transit are improved.

The application provides a flexible sailboard satellite active vibration control method and device for SADA disturbance, and belongs to the field of spacecraft attitude determination and control. The method solves the stability problem caused by frequency drift in the prior art, and solves the problem that the satellite model cannot adapt to the time-varying system. The method comprises the following steps: collecting SADA driving angle, fiber-optic gyroscope angular velocity and piezoelectric sensor voltage data; performing discrete short-time Fourier transform on the voltage data to obtain amplitude spectrum and phase spectrum; identifying the frequency corresponding to the amplitude peak value according to the amplitude spectrum, and associating the SADA driving angle corresponding to the peak value and the fiber-optic gyroscope angular velocity; judging the whole-satellite stability according to the fiber-optic gyroscope angular velocity, and adjusting the control parameters of the piezoelectric actuator in sections when the angular velocity exceeds the set threshold; and iteratively executing the above steps until the whole-satellite stability along the whole orbit meets the index requirement. The method is mainly used in the field of satellite control.

The invention discloses a switch control method for an intelligent vibration reduction platform of a helicopter seat, and the method comprises the steps: recording the time when a vibration excitation signal passes through a zero point at each time through the characteristic that the vibration excitation signal can pass through the zero point in each complete period, and obtaining a real-time period value of the excitation signal through the time difference between adjacent zero points; and the real-time frequency of the excitation signal is further obtained. Whether the current is switched on or off is judged by analyzing whether the real-time excitation frequency is in the resonance area of the vibration reduction platform, the working current of the magnetorheological damper is controlled, and vibration control over the intelligent vibration reduction platform for the helicopter seat is achieved. According to the invention, the excitation signal is analyzed by using zero-cross detection, so that the response time of the switch control method can be effectively reduced. In addition, a complex algorithm or continuous adjustment is not needed by using the switch control method, the energy consumption is low, the hardware is simple, and the reliability is high. A new thought is provided for the semi-active vibration control method of the magnetorheological damper, and the method has a wide application prospect in the field of vibration control.

The application discloses a kind of based on oscillating float active-passive hybrid wave energy power generation method, it is related to marine renewable energy technology field, the application includes step one, external energy receiving module, step two, internal energy transmission module, step three, active-passive hybrid control module and step four, electric energy conversion storage module.The application breaks through the limitation of traditional energy trapping frequency band by built-in nonlinear dynamics mechanism, realizes the efficient directional transmission of wideband wave energy to internal vibrator, can be stable and adapt to multi-frequency actual marine wave scene, and continuously maintains higher energy trapping efficiency in complex sea conditions.For the defects of high energy consumption of active vibration control and weak passive vibration reduction of existing energy trapping devices, active-passive hybrid control strategy is adopted, which effectively reduces the dependence of active control and operating energy consumption, and adapts to long-term continuous energy trapping operation in marine environment.

The invention discloses a driving and sensing integrated vibration control system based on a dielectric hydraulic amplification device and a method of the driving and sensing integrated vibration control system. According to the system, driving and sensing integrated vibration control on the structure can be realized by utilizing the characteristics that a dielectric hydraulic amplifying device acts under voltage and senses deformation according to capacitance change. The system comprises a dielectric hydraulic amplification device capable of realizing actuation and sensing at the same time, a self-sensing circuit combining high-voltage low-frequency signals with low-voltage high-frequency signals, a control loop for controlling relay switching based on sensing signals, and a PID control loop for controlling output voltage. And the dielectric hydraulic amplification device is attached to the surface of a controlled structure to realize in-situ measurement and control. The self-sensing circuit superposes a high-frequency small-amplitude signal on a high-voltage direct-current signal, and the capacitance change of the dielectric hydraulic amplification device is measured by utilizing the characteristic that the capacitance impedance changes along with the frequency. And the control loop utilizes the sensing voltage to control the relay to switch on and off of a control signal, and adjusts the magnitude of the output voltage according to the PID controller to realize active vibration control of the structure.

The invention provides a vibration frequency estimation system and method based on real-time signal processing, and relates to the technical field of vibration active control, the system comprises a vibration sensor, a bias circuit and a vibration frequency estimation control module, and the method comprises the following steps: collecting a vibration signal based on the vibration sensor, the bias circuit and a signal collection module; the frequency estimation-based module performs frequency estimation based on the vibration signal, and finally outputs two paths of sine wave signals; the two paths of output sine wave signals are sent to the data integration module based on the data transmission module; and carrying out data integration on the two paths of sine wave signals based on a data integration module. According to the method, the problem that the vibration reduction performance is reduced due to insufficient frequency estimation precision in an existing active vibration control system is solved, and the response speed and the control precision of the system are improved.

This invention discloses an active vibration reduction control method for mechanical vibration of cutting tools during aluminum machining. The method includes: acquiring multi-source chatter data of the aluminum machining tool, extracting chatter features, and filtering effective features to obtain key chatter features; performing a comprehensive risk assessment and classification of the current chatter state of the aluminum machining tool based on the key chatter features, and calculating the dominant chatter frequency and energy concentration; matching multi-level control strategies for the current aluminum machining tool based on the risk classification results; adjusting the parameters of the matched control strategies according to the dominant chatter frequency and energy concentration to generate tool chatter suppression decisions; during the execution of the tool chatter suppression decisions, when the tool chatter exceeds the current chatter risk threshold, matching the next level of control decisions and adjusting the corresponding parameters to obtain a progressively dynamically optimized active tool chatter suppression decision. This method has the effects of highly sensitive early warning, precise graded vibration reduction, and improved accuracy of vibration reduction control.

The application discloses a data-driven control method for flexible manipulator vibration suppression and relates to the technical field of robot control, and comprises the following steps: a feedback control system for end vibration suppression of a flexible manipulator is constructed, and residual vibration collection information of the end vibration sensor is taken as driving data in a period; a corresponding adjustable feedback controller of the control system is designed; the adjustable feedback controller is optimized through adjustable parameters; the feedback control system for realizing residual vibration minimization is obtained; and an adaptive parameter optimization algorithm is developed to realize the minimization of end residual vibration as a target; the developed algorithm is based on driving data to realize real-time optimization of the feedback controller; the application breaks through the limitation of the existing active vibration control method, only relies on real-time sampling signals of the end vibration sensor of the flexible manipulator as driving data of the control system, and can realize effective suppression of end residual vibration, thereby realizing a completely data-driven flexible manipulator vibration control method.

The invention discloses an engine support load real-time monitoring method and system, and belongs to the field of automobile engineering state monitoring. The method comprises the following steps: acquiring an original strain signal, a real-time temperature signal and a three-axis vibration acceleration signal synchronously acquired by a composite sensing unit; performing elastic modulus correction and temperature drift deduction on the original strain signal according to the real-time temperature signal to obtain a corrected stress value; respectively inputting the corrected stress value into a low-pass filter and a high-pass filter which are arranged in parallel, extracting a low-frequency quasi-static load component and a high-frequency dynamic alternating load component, and performing phase compensation; and a Kalman filter state space model with the triaxial vibration acceleration signal as control input and the corrected stress value as an observation value is constructed, multi-source information is fused through filtering recursion, and a real-time load vector is output. According to the method, the precision and robustness of load monitoring are improved, and reliable data support is provided for fatigue evaluation and active vibration control of the engine support.