42 results about "Vibration transmissibility" patented technology

The invention belongs to the technical field of vibration isolation testing, and particularly relates to a method for testing the vibration transmissibility of an autonomous excitation active vibration isolator. The method comprises the steps of excitation signal generation and input, vibration signal acquisition, signal coherence analysis and vibration transmissibility calculation. Due to the fact that ultra-precision equipment is sensitive to environmental vibration, an active vibration isolator is usually needed when the ultra-precision equipment is used, and low-frequency vibration such as ground vibration is isolated. In order to evaluate the vibration isolation performance of the active vibration isolator, the vibration transmissibility of the active vibration isolator needs to be tested and analyzed. According to the test method, an actuator and a sensor of the active vibration isolator are adopted, and an additional excitation device and a test sensor are not needed. The method provided by the invention is simple and convenient to implement, short in time consumption and good in test effect, and can solve the technical problem of testing the vibration transmissibility of the active vibration isolator.

A large-scale precise micro-vibration isolation self-adaptive active and passive composite space electromagnetic array damping regulation and control device belongs to the technical field of vibration isolation and adopts 4n (n is greater than or equal to 1 and n belongs to N +) layers of uniform-section magnetic rings which are arranged in an array along the axial direction and are vertically magnetized between adjacent layers to form an inner permanent magnet array and an outer permanent magnet array which are coaxially nested, so that a high-flux-density excitation magnetic field is constructed around a conductor plate; the conductor plate moves relative to the magnetic field to generate a strong damping effect. When the external excitation frequency changes, the current in the coaxial nested coil on the outer side of the conductor plate is accurately regulated and controlled through speed feedback, and the damping force is dynamically adjusted. The high damping characteristic is shown during low-frequency micro-vibration, and the vibration transmissibility is effectively reduced; and during high-frequency micro-vibration, the low-damping characteristic is presented, and high-efficiency attenuation of vibration interference is realized. According to the active and passive composite damping regulation and control strategy, the adaptability and stability of large-scale precise micro-vibration isolation and the vibration isolation performance of the large-scale precise micro-vibration isolation in a complex vibration environment are enhanced.

The invention discloses a vibration abnormity simulation test device and method for an aero-engine disc-drum type rotor system, and belongs to the technical field of aero-engine vibration simulation test. A front supporting assembly, a high-pressure compressor disc assembly, a disc-drum combined structural member and a rear supporting assembly of the device are sequentially arranged on a high-pressure turbine shaft, and the front supporting assembly is arranged on a front support assembly; the rear supporting assembly is arranged on the rear support assembly. The method comprises the steps that the high-pressure turbine shaft is connected into the driving motor through the elastic coupler; arranging a sensor for measuring abnormal vibration of the rotor system; after the device is adjusted to a preset abnormal state, the driving motor is started, and data collected by the sensor is transmitted and summarized to the computer for analysis. Compared with a real aero-engine disc-drum type rotor system, the aero-engine disc-drum type rotor system has high structural similarity and dynamic similarity, the structural design is more concise and reasonable, the vibration transmissibility is good, and the working state and the abnormal vibration characteristic of the connecting interface of the elastic supporting structural part and the disc-drum combined structural part can be simulated more truly.

The invention discloses an optical thermostat with comprehensive vibration reduction and low-temperature in-situ displacement functions, which adopts upper and lower opposite vibration absorbers and a large-mass base to realize first-order to second-order inertial vibration absorption, and further realizes thorough decoupling with an optical platform in a suspension type non-contact manner, and the vibration transmissibility can be reduced to be less than 10%. Resonant frequencies of two systems (a sample table system and a cold head system) are designed to achieve vibration decoupling. The technical problems that in the prior art, the high-grade vibration isolation capacity is insufficient, refrigerator noise is easily coupled to a measuring light path, the low-temperature in-situ precision displacement capacity is lacked, and the contradiction between heat isolation, convenience and cost is difficult to balance can be solved. Under the support of a conventional GM refrigerator, the comprehensive requirements of ultralow basic vibration, strong decoupling of a measurement light path, low-temperature in-situ micron-sized displacement, convenient sample replacement and efficient refrigeration / thermal control are met at the same time.

The invention discloses a vibration prediction method for a subway superstructure building based on a null space method and an energy method, comprising the following steps: using the energy method to obtain the energy functional of each shear wall and floor slab; obtaining the connection displacement coordination condition matrix between the shear wall and floor slab of each layer of a single-layer and double-layer subway superstructure building under a consolidation connection condition based on the energy functional; obtaining the constraint condition matrix between the shear wall and floor slab of each layer of the single-layer and double-layer subway superstructure building based on the connection displacement coordination condition matrix, using the null space method to solve the constraint condition matrix, constructing the total energy functional of the subway superstructure building and rewriting it into a weight coefficient column vector, scanning the frequency in the weight coefficient column vector, obtaining the displacement response of the subway superstructure building, and then calculating the vibration transmissibility; based on the framework of the energy method, the invention decouples the displacement shape function from the boundary condition, avoids the boundary dependence and other problems in the shape function construction, and then realizes a simple and fast representation of the displacement field of each component of the superstructure building structure.

The present disclosure relates to a tactile presentation device that includes a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob. The tactile presentation knob includes a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on the side opposite to the operation screen, and an operation part that fixes the conductive elastic portion. The surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate vibrations by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob. The inner layer is set to have higher vibration transmissibility than the surface layer.

The utility model relates to the technical field of servo driver vibration prevention, and particularly discloses a vibration prevention device of a servo driver, which comprises a driver body, a vibration prevention assembly is arranged below the driver body, an installation assembly is arranged on the outer wall of the vibration prevention assembly, and the vibration prevention assembly comprises a polyurethane foam layer. A metal honeycomb plate is arranged at the lower end of the polyurethane foam layer, a silica gel damping pad is arranged at the lower end of the metal honeycomb plate, the mounting assembly comprises an upper supporting frame and a lower supporting frame which are of a U-shaped structure, and vertical plates are fixedly connected to the left end and the right end of the polyurethane foam layer and the left end and the right end of the silica gel damping pad correspondingly. And rectangular grooves are formed in the outer walls of the multiple vertical plates, through a composite damping assembly composed of a polyurethane foam layer, a polyurethane foam layer and a silica gel damping pad, the vibration transmissibility can be reduced, and precise electronic elements are protected.

According to the design method of the active vibration isolation controller with the self-optimized parameters, the controller parameters can be automatically generated by solving the optimization problem, the frequency band of vibration suppression of the vibration isolator can be set, targeted vibration suppression is achieved, and the stability of the vibration isolator is guaranteed. According to the method, the vibration transmissibility of the vibration isolation system is set as the cost, the phase margin is not smaller than the set minimum value and is set as the constraint, a parameter optimization problem is constructed, the parameters of the multi-order lead-lag compensator in the controller are solved, and the vibration suppression rate and the vibration isolator stability are both considered. According to the method, the problem of long adjustment time caused by manual parameter configuration of the active vibration isolation controller can be solved, and help is provided for design of the active vibration isolation controller.

This invention relates to a full-frequency vibration reduction design method for metamaterial pipelines based on multiple band gaps, comprising: establishing an equivalent mechanical model of the target pipeline; periodically arranging elastic supports on the target pipeline to induce the formation of a zero-frequency band gap and a Bragg band gap, coupling the equivalent support stiffness of the elastic supports with the equivalent mechanical model of the pipeline to construct a first band gap calculation model; periodically arranging local resonant vibration absorbers on the target pipeline to form a local resonant band gap, coupling the equivalent stiffness and equivalent mass of the local resonant vibration absorbers into the first band gap calculation model to obtain a second band gap calculation model; constructing a system finite structure dynamic vibration calculation model with a second assembly as the analysis object; constructing a vibration transmissibility index, and using the system finite structure dynamic vibration calculation model as a fitness evaluation tool for a genetic algorithm to perform non-periodic optimization of the elastic support positions, solving for the optimal arrangement position of the elastic supports with the largest bandwidth of the zero-frequency band gap.

The invention relates to the technical field of fascia guns, in particular to a silicone rubber ring damping system of a fascia gun and a damping effect calculation method.The silicone rubber ring damping effect calculation method of the fascia gun comprises the steps that the eccentric distance of a crank and the length of a connecting rod are determined, and the eccentric distance of the crank and the length of the connecting rod serve as fixed values; the damping ratio and the collision frequency ratio of the silicone rubber ring are variables, the vibration transmissibility after the silicone rubber ring is installed is calculated through a transmissibility formula in a single-degree-of-freedom system, and then the damping effect of the silicone rubber ring is calculated. The noise problem of the fascia gun in the prior art and the problem of quantitative calculation of the damping effect of the silicone rubber ring of the fascia gun are effectively solved.

The invention discloses a multimodal transport logistics device and a control method thereof, the device comprises a logistics device body and an intelligent control module, the logistics device body comprises an intelligent lock catch mechanism, an auxiliary loading and unloading mechanism, a vibration damping and buffering system and an intelligent monitoring module; the intelligent lock catch mechanism determines motor output parameters through a torque matching method to complete rapid locking and unlocking; the auxiliary loading and unloading mechanism adapts to loading and unloading requirements of different gradients and cargo mass through a thrust calculation model; the vibration damping and buffering system reduces the vibration transmissibility through the optimal design of the inherent frequency and the damping ratio. According to the invention, the locking and unlocking efficiency, the loading and unloading stability and the vibration protection capability are improved, the cargo transportation safety is guaranteed, and the efficient and large-scale development of multimodal transportation is assisted.

The application provides a shell radiation noise evaluation method and device and electronic equipment. The method comprises the following steps: obtaining a modal vibration mode of a shell structure; determining a plurality of measurement points of the shell structure based on a modal vibration region of the modal vibration mode; determining vibration transmissibility data of each measurement point through a vibration sensor when each measurement point is tapped; determining vibration overall radiation energy of the shell structure based on the vibration transmissibility data of the plurality of measurement points, and determining shell radiation noise of the shell structure based on the vibration overall radiation energy. In this way, the shell radiation noise level in the actual operation process of the shell structure can be effectively predicted by carrying out tapping test on the measurement points of different parts of the shell structure to obtain the vibration transmissibility data without running test on the electric drive bench, so that the NVH performance of the electric drive product and the comfort of the new energy vehicle are improved.

This utility model discloses a vibration-damping and noise-reducing silent heat sink, including a heat sink assembly, a fan, and a base plate. It also includes a vibration-damping connector and a flow guide shroud. The vibration-damping connector is made of an elastic material and has a ring-shaped structure, nested between the fan and the flow guide shroud. The flow guide shroud surrounds the air outlet side of the fan, and its inner wall has a spiral flow guide groove. The heat sink assembly includes multiple wavy, non-equidistantly arranged heat dissipation fins, forming a gradually expanding airflow channel. The bottom of the base plate has a honeycomb-shaped vibration-damping cavity filled with damping adhesive. The three-stage vibration-damping structure significantly reduces vibration transmission rate, reduces resonance, and extends equipment life. The spiral flow guide groove, sound-absorbing grille, and wavy fin phase difference design significantly reduce wind noise and structural noise.

The invention discloses a metro upper cover building vibration prediction method based on a null space method and an energy method. The metro upper cover building vibration prediction method comprises the following steps that the energy functional of each shear wall and floor slab is solved by using the energy method; solving a connection displacement coordination condition matrix of each layer of shear wall and floor of the upper cover building of the single-layer and double-layer metro under the consolidation connection condition based on the energy functional; solving a constraint condition matrix of each layer of shear wall and floor of the single-layer and double-layer subway superstructure based on the connection displacement coordination condition matrix, solving the constraint condition matrix by using a null-space method, constructing a total energy functional of the subway superstructure and rewriting the total energy functional into a weight coefficient column vector, and calculating the total energy of the subway superstructure by scanning the frequency in the weight coefficient column vector. The displacement response of the subway upper cover building is obtained, and then the vibration transmissibility is calculated; according to the method, the displacement shape function and the boundary condition are decoupled based on the framework of the energy method, the problems of boundary dependence and the like in shape function construction are avoided, and then the displacement field of each component of the upper cover building structure is simply and quickly expressed.

The invention discloses a multi-stage composite damping system and method for an unmanned aerial vehicle nest of a vehicle-mounted mobile platform, and relates to the technical field of vibration control technology and structural design in mechanical engineering, the multi-stage composite damping system adopts a composite damping structure of at least two stages (coarse vibration isolation and fine vibration isolation), and utilizes the characteristics of different damping elements to carry out frequency matching and step-by-step energy dissipation. According to the first stage, low-frequency and large-amplitude impact generated by a vehicle under severe road conditions is effectively restrained, and the overall structure is protected; and in the second stage, medium-high frequency vibration left after passing through the first stage and generated by the vehicle itself are attenuated in a targeted manner. Compared with a traditional single-stage or simple passive damping system, the design of frequency division and synergistic effect can significantly reduce the vibration transmissibility in a wider spectral range from low-frequency impact to high-frequency micro-vibration, and provides a far superior protection environment for precision equipment sensitive to vibration in a machine nest.

The present application belongs to the technical field of air suspension, and provides a vehicle air suspension damping effect determination method, system and application, comprising synchronously acquiring input acceleration and output acceleration of a vehicle air suspension under simulated road excitation; based on the input acceleration and the output acceleration, calculating a vibration transmission rate and performing frequency domain analysis to obtain a frequency domain transmission rate curve representing the damping effect of the air suspension; based on the frequency domain transmission rate curve, establishing a quantitative criterion for guiding design, the quantitative criterion comprising full-working-condition adaptability, parameter correlation and performance consistency; based on a quantitative mapping relationship between key parameters of the air suspension and a change amount of the vibration transmission rate at a characteristic frequency constructed according to the parameter correlation quantitative criterion, an optimization strategy of the key parameters of the air suspension is determined with the vibration transmission rate of a target frequency band as the optimization direction. The present application can accurately evaluate the energy filtering efficiency between road input and vehicle body response of the air suspension.

This application provides a vehicle seat analysis method, apparatus, electronic device, and storage medium. The method includes: establishing a first finite element model of the vehicle seat; inputting an excitation load into a first virtual excitation point to obtain first vibration information generated by a first virtual response point; obtaining a first vibration transmissibility of the first seat finite element model based on the first vibration information; establishing a vehicle floor and setting an elastic connection between the vehicle floor and the first seat finite element model to obtain a second seat finite element model; inputting an excitation load into a second virtual excitation point to obtain second vibration information generated by a second virtual response point; obtaining a second vibration transmissibility of the second seat finite element model based on the second vibration information; and obtaining vibration comfort analysis results based on the first and second vibration transmissibility. This application can accurately analyze the vibration comfort of vehicle seats and can reduce the vibration analysis cost of vehicle seats.

The invention belongs to the technical field of ocean engineering and mechanical engineering. In order to solve the problems that a traditional vibration isolator is prone to failure and energy is wasted, a rigidity-damping-mass collaborative optimization model is provided, a shape memory alloy intelligent vibration isolator is adopted, and vibration energy recovery is achieved in combination with piezoelectric ceramics. The layout is optimized through a response surface method, so that the vibration transmissibility is 1t; 0.15, the energy recovery rate gt; and 12%. Experiments prove that the vibration amplitude of equipment is reduced by 40%, the failure rate is reduced by 55%, and electric energy gt is recovered per day; and vibration isolation performance improvement and energy management are both considered, and an innovative path is provided for stable operation of floating type hydrogen energy equipment.

The present disclosure pertains to a tactile sensation presentation device in which a tactile sensation presentation button (3) is placed on an operation surface and a tactile sensation is presented to a user via the tactile sensation presentation button (3), the tactile sensation presentation button (3) being provided with: a conductive elastic part (6) having a surface layer (61) facing the operation surface and an inner layer (62) on the opposite side from the operation surface; and an operation part 4 for fixing the conductive elastic part, the surface layer 61 is set to have a greater shear deformation due to the operation of the tactile presentation button 3 than the inner layer 62, to generate vibration due to a change in friction force, and to have a greater compressive deformation when the tactile presentation button 3 is pressed than the inner layer 62, and the inner layer 62 has a greater vibration transmissibility than the surface layer 61.

Large precision micro-vibration isolation adaptive active-passive composite space electromagnetic array damping control device belongs to the field of vibration isolation technology, adopting 4n (n≥1, n∈N + ) layers of equal-cross-section magnetic rings are arranged in an axial array and the adjacent layers are magnetized perpendicularly, forming coaxially nested inner and outer permanent magnet arrays, thereby constructing a high-magnetic-density excitation magnetic field around the conductor plate. The conductor plate produces a strong damping effect relative to the movement of the magnetic field. When the external excitation frequency changes, the current in the coaxially nested coils outside the conductor plate is precisely regulated by speed feedback, and the damping force is dynamically adjusted. In low-frequency micro-vibrations, it exhibits high damping characteristics, effectively reducing the vibration transmission rate; in high-frequency micro-vibrations, it exhibits low damping characteristics, achieving efficient attenuation of vibration interference. This active and passive composite damping control strategy enhances the adaptability and stability of large-scale precision micro-vibration isolation and its vibration isolation performance in complex vibration environments.

The invention discloses a tuned mass damping system for improving the specific frequency dynamic stiffness of an anti-microvibration base, and belongs to the technical field of vibration control. Comprising an independent modularized shell, a top cover, a mass block, a steel plate spring, a frequency adjusting mechanism, a guide structure, a damping assembly and an installation structure, the frequency adjusting mechanism drives a sliding block through a rotary knob and a lead screw to change the effective working width of the steel plate spring, continuous adjustment of the inherent frequency is achieved, the frequency is visually displayed through an instrument, and stability is guaranteed through a locking structure; the guide structure restrains the mass block to move only in the main vibration direction, and damping of the damping assembly is adjusted through a replaceable damping pad. The tuning method comprises the steps of frequency calibration, target frequency determination, frequency tuning, damping optimization and operation verification, and accurate parameter matching is realized based on a frequency sweep test. The device can be tuned on site, can be used after being installed, is adaptive to various controlled structures, can directionally improve the specific frequency dynamic stiffness, reduces the vibration transmissibility, gives consideration to the dynamic performance and the vibration suppression effect, and is reliable in stability.

The present disclosure relates to a tactile presentation device that includes a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob. The tactile presentation knob includes a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on the side opposite to the operation screen, and an operation part that fixes the conductive elastic portion. The surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate vibrations by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob. The inner layer is set to have higher vibration transmissibility than the surface layer.

This invention relates to the field of diesel generators, and in particular to a quiet diesel generator, comprising a chassis unit, a power generation unit mounted on the chassis unit, a sound-absorbing unit mounted on the chassis unit, and a docking unit between the chassis unit and the power generation unit. This invention forms a double-layer common chassis by placing a wire rope vibration isolator and an air spring between the upper and lower base layers, reducing the vibration transmission rate of the diesel generator to the ground during operation and blocking the propagation of engine vibration to the foundation and building structure. Simultaneously, through the installation of a closed enclosure and a hollow layer, an integrated sound-absorbing and sound-insulating cavity is created outside the generator and diesel engine, reducing the noise transmitted by the diesel generator to the outside, enabling the equipment to meet the usage requirements of noise-sensitive areas such as hospitals and residences. This invention also utilizes the fault tolerance capability of the worm gear and gear-driven generator coupling assembly to achieve rapid alignment and periodic adjustment of the generator and diesel engine.

The utility model belongs to the technical field of water pumps, and particularly relates to a mounting device for damping a pump body and a pump assembly applying the same, the mounting device comprises a mounting seat and a damping sleeve, the mounting seat is provided with a first assembling groove, the damping sleeve is detachably arranged in the first assembling groove, and the damping sleeve is provided with a second assembling groove. The shock absorption sleeve comprises a sleeve body and a plurality of flexible shock absorption ribs, the sleeve body is provided with a second assembly groove, the flexible shock absorption ribs are arranged around the periphery of the sleeve body at intervals, and when the sleeve body is arranged in the first assembly groove, the outer end of each shock absorption rib abuts against the inner surface of the first assembly groove. And the damping sleeve is provided with the damping rib abutting against the inner surface of the first assembling groove, the damping rib can absorb vibration energy and reduce the vibration transmission rate, the stability of the pump body can be enhanced, noise can be reduced, and therefore the use experience is improved.

The invention belongs to the technical field of suspension control, and discloses a multistage voltage adjustable electrorheological fluid damping device for a vehicle suspension and a control method. The method comprises the steps of scanning a front pavement to obtain pavement characteristic parameters, and inputting the parameters into a mode analysis model to obtain a pavement mode; at the sound wave emission moment, an ultrasonic induced electrorheological fluid pre-structure is emitted according to sound wave parameters corresponding to the pavement mode, and a corresponding pre-structure form and pre-yield stress are obtained; n-level voltage parameters and target damping force are obtained based on the pavement mode and pre-yield stress division, an N-level power source is controlled to execute the N-level voltage parameters, real-time damping force is obtained through calculation and corrected, and the damping force is corrected in real time to the target damping force through feedback adjustment; the breakthrough from passive response to active pre-judgment is achieved, electrorheological fluid pre-structuring and damping force adjustment can be completed in advance on an extreme continuous bumpy road surface, response delay is avoided, and the vibration transmissibility is remarkably reduced.

The invention relates to the technical field of flywheel energy storage equipment, in particular to a flywheel energy storage unit base which comprises a supporting seat body, and a flywheel unit mounting plate for mounting a flywheel unit is arranged above the top end of the outer wall of the supporting seat body. A fixing mechanism fixed to a flywheel unit mounting plate is arranged at the top end of the outer wall of the supporting seat body, a damping mechanism for buffering and damping is arranged on the fixing mechanism, and a leveling mechanism used for leveling the fixing mechanism is arranged on the supporting seat body. And the fixing structure is used for fixing the supporting seat body on a mounting foundation. The problems that an existing base is not provided with a special damping and buffering structure, or only a single rubber pad is adopted for damping, broadband vibration generated by high-speed rotation of a flywheel cannot be effectively absorbed, the vibration transmissibility is high, the unit operation noise is large, vibration is easily transmitted to a ground foundation, and normal work of peripheral equipment is affected are solved.

The present application relates to the field of textile machinery and damping control, specifically to a warp knitting machine high-stability bearing seat and a method thereof; comprising a bearing main frame, a damping energy dissipation core, a leveling support foot, a spherical self-adaptive pad, a monitoring part and a controller; the system obtains top and bottom end vibration data in real time through a sensor, calculates vibration transmission rate and attenuation rate and then solves dynamic stiffness, thereby evaluating damping aging state and calculating resonance critical speed; the core is to densely fill the damping energy dissipation core in the main frame to dissipate periodic excitation energy generated by high-speed operation, and to use spherical contact matching of the hemispherical protrusion at the bottom of the support foot and the hemispherical groove of the spherical self-adaptive pad, so that the support foot can be freely deflected to adaptively compensate uneven ground; the present application solves the problems of insufficient existing foundation stiffness and obvious high-frequency vibration transmission, effectively avoids long-term stress concentration and loose connection of the rack, and greatly improves the support stability.

The present application relates to a method for predicting the vibration of an aircraft structure under specific working conditions, comprising: obtaining a vibration transmissibility matrix of the aircraft structure under the test working conditions based on time domain information of vibration response points that are easy to directly measure under specific working conditions on the aircraft structure under the test working conditions and time domain information of vibration response points that are not easy to directly measure under specific working conditions: #imgabs0# Based on the time domain information of vibration response points that are easy to directly measure under specific working conditions on the aircraft structure under specific working conditions and the vibration transmissibility matrix of the aircraft structure under the test working conditions, calculating the time domain information of vibration response points that are not easy to directly measure under specific working conditions on the aircraft structure: #imgabs1# Among them, #imgabs2# is the cross-power spectral density matrix between vibration response points that are easy to directly measure under specific working conditions on the aircraft structure under the test working conditions and the specific working conditions and the vibration response points that are not easy to directly measure; #imgabs3# is the cross-power spectral density matrix between vibration response points that are easy to directly measure under specific working conditions on the aircraft structure under the test working conditions and the specific working conditions.

An oral care implement includes a head detachably coupled to a handle. The head has a neck portion and a head portion. The head portion has a laminated configuration whereby the base structure is enclosed by the sheet structure and the protective structure. A plurality of bristle tufts extend from the front surface of the sheet structure, and the bristle tufts are formed by a plurality of filament bristles. The base structure may be a material having a greater vibration transmissibility that is plastically deformable to form a desired head shape.

The invention belongs to the field of precise active vibration reduction, and particularly discloses a fault diagnosis method and system of an active vibration reduction system. The method specifically comprises the steps of obtaining a frequency response curve of related vibration transmissibility based on a kinetic equation of an active vibration reduction system; and performing fault diagnosis on related parts in the active vibration reduction system by adopting the frequency response curve of the related vibration transmissibility. According to the method, the fault points of the key actuator and the sensor in the active vibration reduction system can be quickly judged.