43 results about "Nonlinear vibration" patented technology

The invention relates to the technical field of electromagnetic measurement, in particular to a method for increasing a constant-speed section in motion of a power balance coil by introducing nonlinear vibration, and the method comprises the steps: introducing an odd harmonic current component meeting a first target condition into a drive coil of a target power balance, and carrying out the initial compensation of the coil, generating an initial coil speed curve, meeting a preset flat condition, of the coil according to the initial compensation result, and introducing a second harmonic current component meeting a second target condition into the driving coil based on the initial coil speed curve to carry out at least one secondary compensation, and generating at least one coil speed curve of the coil according to the at least one secondary compensation result, and determining that the coil moves in the target constant-speed section when the fluctuation quantity and the gradient of the at least one coil speed curve meet preset standards. Therefore, the problems that in the prior art, a coil movement speed curve is prone to fluctuating and inclining, and the accuracy and repeatability of a power balance measurement result are reduced are solved.

The invention discloses a nonlinear acoustic transducer control method and system based on an Aubry-Mather set, and belongs to the technical field of acoustic transducers. The method comprises the following steps: firstly, based on an Aubry-Mather set theory, constructing a nonlinear vibration model used for describing nonlinear vibration of a transducer diaphragm; secondly, based on a nonlinear vibration model, regional piezoelectric driving and dynamic phase regulation are carried out to simulate a quasi-periodic fluctuation mode; then, on the basis of fluctuation characteristics disclosed by the nonlinear vibration model, a multi-diaphragm collaborative vibration system is constructed, and quasi-periodic superposition of sound waves is realized by optimizing diaphragm space layout; and finally, based on stiffness parameters in the nonlinear vibration model, integrating a micro electro mechanical system (MEMS) process and a nonlinear material, and realizing equivalent nonlinear stiffness on a physical device through gradient polarization design. The dynamic adaptability, the energy transfer efficiency and the high-frequency output performance of the transducer in a broadband range are effectively improved, and the transducer is particularly suitable for ultrasonic imaging and other high-frequency acoustic application scenes.

The utility model provides a chimney damping device, which belongs to the technical field of chimney damping, and comprises a mounting assembly and an adjusting assembly, the mounting assembly comprises a mounting track annularly arranged on the periphery of a chimney and a mounting seat slidably connected to the mounting track, and the mounting track is connected to the chimney; the adjusting assembly comprises a fixing rod connected to the mounting base and a balance weight mechanism connected to the fixing rod, the fixing rod extends in the radial direction of the mounting rail, and the balance weight mechanism is located at the end, away from the mounting base, of the fixing rod. The balance weight mechanism comprises a balance weight block connected to the fixing rod in a sliding mode and two elastic pieces connected to the balance weight block, and the two elastic pieces are arranged on the two sides of the balance weight block respectively along the extending path of the fixing rod. The utility model provides a chimney damping device which aims at solving the problem that when an existing tuned mass damper faces nonlinear vibration, the damping effect of the damper is poor.

The invention discloses a motor bearing performance degradation state evaluation method and system, and relates to the technical field of bearing performance evaluation, and the method comprises the following steps: building a time-frequency response mapping model of a rolling body fatigue micro-crack region, and calculating the performance degradation state of a motor bearing according to a vibration signal, rotation speed fluctuation and load change of the motor bearing in the operation process; extracting an energy distribution curve of the micro-lag region, and constructing a multi-scale phase delay matrix according to the energy distribution curve; and constructing a local energy coupling identification network based on a phase delay matrix output by the time-frequency response mapping model. Accurate identification and early degradation prediction of motor bearing microcrack energy behaviors are realized through time-frequency mapping and a phase delay matrix, and self-healing adjustment and closed-loop control of an energy field are realized through a self-adaptive phase inversion and anti-lag compensation mechanism, so that nonlinear vibration instability is effectively inhibited; the running stability and the service life of the bearing are obviously improved.

The present application belongs to the technical field of structure vibration isolation and reduction, and particularly relates to a vertical quasi-zero stiffness limiting vibration isolation device with adjustable load. The device comprises a bearing plate, an upper limiting plate, a lower limiting plate, a positive stiffness mechanism, a negative stiffness mechanism, a connecting rod and an adjusting support part. The positive stiffness mechanism is arranged between the bearing plate and the upper limiting plate, and the negative stiffness mechanism and the adjusting support part are arranged between the upper limiting plate and the lower limiting plate. The adjusting support part comprises four supporting cylinders and eight round-hole sliders. The connecting rod connects the positive stiffness mechanism and the negative stiffness mechanism, and a central connecting block is arranged on the connecting rod. One end of the negative stiffness mechanism is connected with the central connecting block, and the other end is connected with a round-hole slider. By adjusting the pre-compression coefficient of the inclined elastic element of the negative stiffness mechanism, the stroke of the round-hole slider and the position of the central connecting block on the connecting rod, the quasi-zero stiffness characteristic is maintained at the initial static force balance position, and the nonlinear vibration isolation effect of high static stiffness and low dynamic stiffness is realized.

The application discloses a multi-stable electromagnetic energy capturing vibration absorber, and belongs to the field of vibration suppression and energy capturing. The multi-stable electromagnetic energy capturing vibration absorber comprises a nonlinear vibration suppression device and an electromagnetic multi-stable energy capturing oscillator installed thereon. The nonlinear vibration suppression device is designed based on the technical principle of a quasi-zero stiffness vibration isolator, multi-stable motion is realized through the structural design of the electromagnetic multi-stable energy capturing oscillator, and the vibration energy capturing performance is further improved. The problems that the existing vibration isolation-energy capturing integrated device can only realize single-stable small-amplitude oscillation, vibration energy cannot be fully converted, the potential well width is limited, and large-amplitude motion cannot be realized under low-frequency conditions are solved.

This invention provides a method and system for analyzing the vibration response of an SFD rotor system during acceleration and deceleration. The method includes constructing an SFD rotor system; the SFD rotor system includes an SFD dynamic model, in which stiffness varies with rotational speed; calculating the vibration response of the SFD rotor system sequentially according to the rotational speed changes during acceleration and deceleration; and calculating the vibration response in a nonlinear manner during nonlinear changes. The nonlinear vibration response calculation includes: determining an initial displacement response value; wherein the initial displacement response value is determined based on the displacement responses corresponding to preset rotational speeds before the current speed; obtaining the stiffness and damping values ​​at the current rotational speed based on the SFD dynamic model and the initial displacement response value; and calculating the displacement response value based on the stiffness and damping values ​​at the current rotational speed, thereby obtaining the vibration response analysis results under nonlinear conditions.

The invention belongs to the technical field of vibration reduction and noise reduction, and particularly relates to a vibration reduction fastener for rail transit, which comprises a lower base plate, an inter-plate buffer base plate, an upper base plate and at least two limiting components, the lower base plate is provided with at least two positioning bosses; the inter-plate buffering base plate is provided with at least two first positioning holes used for being arranged on the corresponding positioning bosses in a sleeved mode respectively. The upper base plate is arranged above the inter-plate buffer base plate, and the upper base plate is provided with at least two second positioning holes which are respectively sleeved on the corresponding positioning bosses; the at least two limiting assemblies are arranged above the upper base plate and arranged on the corresponding positioning bosses in a sleeving mode, and the limiting assemblies and the positioning bosses are mutually locked in a concave-convex fit mode. Through the integrated pre-assembly design, the concave-convex locking structure, the double-layer nonlinear vibration reduction mechanism and the limiting part function, the problems that in the prior art, the construction efficiency is low, the pre-pressure is not stable, and the vibration reduction effect is poor are solved.

The application discloses a variable center distance split type gear test bench and a nonlinear vibration testing method. The test bench uses a split open gear box design, and the driving gear shaft and the driven gear shaft are respectively arranged on two parallel driving gear boxes and driven gear boxes. The driving gear box shaft system is fixed on the workbench surface and cannot be moved. The driven gear box, the sensor on the coaxial system and the load motor are placed on the movable platform supported by the linear sliding guide rail, so that the center distance between the driving gear shaft and the driven gear shaft can be adjusted. After the center distance is determined, the center distance is locked through the locking mechanism between the box bodies. The application solves the problem that the traditional integrated gear box cannot change the theoretical gear side clearance. The application can be used for observing the meshing impact phenomenon caused by the gear side clearance, the meshing impact occurs in the gear meshing line direction, and can be used for verifying the nonlinear characteristics in the gear box meshing process, such as periodic state, quasi-periodic state and chaotic state.

This invention discloses a variable cross-section arched nonlinear vibration damping device for multi-split conductors, comprising a clamp-type rotary spacer, a variable cross-section arch, a hollow cylindrical pin, and a rigid mass ring. Multiple arc-shaped notches are evenly distributed circumferentially on the inner side of the clamp-type rotary spacer. A variable cross-section arch is rigidly connected to the inner side of each arc-shaped notch, and the outward direction of the arch apex of the variable cross-section arch is opposite to the inward direction of the arc-shaped notch. The rigid mass ring located inside the variable cross-section arch is rigidly connected to the center of the arch apex. This invention obtains different stiffness ranges by changing the structural parameters of the variable cross-section arch, exhibiting strong adaptability, simple structure, and easy installation. All connections are rigid, forming a complete energy dissipation chain: conductor → arch structure → hollow cylindrical pin → rigid mass ring. This broadens the effective vibration damping frequency band and improves vibration energy dissipation efficiency compared to previous methods.

The embodiment of the invention discloses an icing power transmission line galloping determination method and a related device. The method comprises the following steps: acquiring n first working conditions; determining a galloping coefficient of each first working condition; solving a nonlinear vibration equation according to the galloping coefficient corresponding to each first working condition, and determining a first moving distance and a first moving speed of the ice-coated power transmission line corresponding to each first working condition; taking each first working condition and the first moving distance and the first moving speed corresponding to each first working condition as training samples, and training the KAN network through the training samples to obtain a galloping model; obtaining a target working condition; inputting the target working condition into a galloping model, and determining a target moving distance and a target moving speed; and determining the galloping probability of the ice-coated power transmission line according to the target moving distance and the target moving speed. By adopting the embodiment of the invention, when whether the icing power transmission line gallops is determined, the galloping determination efficiency can be improved on the premise of ensuring the galloping determination precision.

The invention provides a nonlinear vibration coupling analysis method for an aerostatic spindle under sliding mode control, and relates to the technical field of machine tool precision machining. A multi-degree-of-freedom system dynamics model is constructed by performing nonlinear coupling calculation on gas film force, unbalanced magnetic pulling force and mass eccentric excitation. Time-varying nonlinearity of bearing rigidity is accurately described through calculation of dynamic air film force, the two-way coupling effect between an electromagnetic field and mechanical motion is revealed through introduction of unbalanced magnetic pulling force, and complex combined frequency vibration can be generated through interaction of mass eccentricity serving as classical external synchronous excitation and the two kinds of internal excitation. According to the method, the controller design can consider and compensate the nonlinear time variation of the gas film force, the state dependence disturbance of the magnetic pulling force and the eccentric force excitation in advance, the reverse influence of the control action on the gas film stability and the electromagnetic field can be evaluated, and the real mechanical-electric-gas-control collaborative optimization is realized.

The application discloses a kind of outer rotor magnetic suspension bearing's double-rotor large energy storage equipment magnetic suspension bearing, including base, double motor, elastic diaphragm coupling, radial magnetic bearing, electromagnetic loading assembly, outer rotor and inner rotor.Outer rotor is coaxially nested envelope in the outside of inner rotor, is made of carbon fiber composite material to promote energy storage inertia;Radial magnetic bearing realizes the non-contact support of double rotor by controlled electromagnetic force;Electromagnetic loading assembly is distributed in key stress position, for applying active load or vibration suppression force.Control system integrates electric eddy current sensor, uses interval control algorithm based on uncertainty quantification, parameter fluctuation is handled as bounded interval variable, dynamically calculates displacement envelope line and actively adjusts stiffness and damping, suppresses nonlinear vibration and prevents rub-impact.The application has the advantages of large energy storage density, strong anti-rubbing ability, high running stability, etc., can significantly improve the reliability and energy cycle efficiency of large flywheel energy storage equipment under extreme conditions.

This invention discloses a dual-performance gas spring integrating stiffness and damping, and a nonlinear vibration suppression method, relating to the field of vibration control. The invention includes a cylinder containing a gas spring piston. One side of the gas spring piston forms a closed cavity, and the other side forms a semi-closed cavity. A damping piston is connected to the distal end of the semi-closed cavity, forming an annular airflow channel with the inner wall of the cylinder. The gas spring piston is connected to a piston rod, which extends through the damping piston to the outside of the cylinder. When the gas spring piston moves, compressing or expanding the gas in the semi-closed cavity, the gas flows within the annular airflow channel, providing energy dissipation capacity for the dual-performance gas spring. This invention forms a novel dual-performance gas spring tuned mass damper, replacing the two components of a traditional damper—the gas spring and the damping device—with a single element, simplifying the damper's structure and solving the problems of complex structure and short service life in traditional gas spring dampers.

This invention discloses a double-layer clamp for aircraft piping with nonlinear vibration reduction function. The device includes an inner clamp, an outer clamp, clamp gaskets, fastening bolts, and fastening nuts. A certain constraint gap exists between the inner and outer clamps. Both the inner and outer clamps are assembled to the aircraft body using fastening bolts and nuts. The inner clamp consists of an inner clamp metal band and an inner clamp bushing; the outer clamp also consists of an outer clamp metal band and an outer clamp bushing. Both the inner and outer clamp bushings are made of nitrile rubber-organic small molecule hybrid composite material, exhibiting excellent damping performance. This invention utilizes the outer clamp to provide nonlinear constraint stiffness and nonlinear constraint damping to achieve nonlinear vibration reduction, enabling wide-frequency vibration reduction and effectively improving the vibration reduction performance of traditional single-layer clamps. This device is easy to manufacture and install, employs a nonlinear passive vibration control strategy, and achieves high efficiency at low cost.

The invention discloses a composite graphite bipolar plate hydrogen fuel cell performance testing machine based on nonlinear vibration, which comprises a security cabin, a side wall plate of the security cabin is made of a high-strength transparent material, and a detection terminal is arranged at the outer side part of the security cabin; the working condition simulation platform is mounted on the inner bottom surface of the security cabin; and the clamping frame can flexibly clamp the battery and is fixed on the working condition simulation platform, and the clamping frame is driven by the working condition simulation platform to carry out inclination adjustment. The device is driven by the telescopic cylinder, so that the inclination of the whole test platform can be adjusted in the pitching direction so as to simulate the battery attitude of a vehicle in ramp, acceleration, braking and other states, and the changes of internal water management, reaction gas distribution and drainage capacity of a fuel cell stack at different angles can be tested; the static horizontal test cannot be realized.

The invention belongs to the field of vibration reduction, and particularly relates to a broadband vibration suppression system based on nonlinear energy trap cells and an optimization algorithm. The invention provides a broadband vibration suppression system based on non-linear energy trap cells and an optimization algorithm. The broadband vibration suppression system comprises a two-degree-of-freedom main structure; the nonlinear vibration reduction module is coupled with the main structure in series, and the nonlinear vibration reduction module comprises n NES cell elements and ngt with consistent parameters; 1. According to the broadband vibration suppression system based on the nonlinear energy trap cells and the optimization algorithm, through the number of the NES cells and the coupling mode, the attenuation bandwidth near the inherent frequency is widened, and the response caused by resonance is greatly reduced. The synergistic effect between the NES cells enhances the saturation effect of the system, thereby improving the dynamic performance of the system in a resonance region.

The present application relates to a kind of electric eddy current damping nonlinear vibration absorber, for hydraulic pipeline, the device includes cable, pulley bearing, metal mass, cable fixing and adjusting device, mounting frame and magnet, cable is threaded in metal mass and is fixed on mounting frame by being encircled over pulley bearing, mounting frame is fixed on hydraulic pipeline, magnet is nested in both ends of mounting frame;When hydraulic pipeline vibrates, metal mass is subjected to the nonlinear restoring force of cable and relative motion is generated with magnet, electric eddy current is generated in metal mass, acts as damping and realizes the suppression of multidirectional vibration in yOz plane.Compared with prior art, the present application has realized the suppression of multidirectional vibration;Nonlinear stiffness is adjusted by cable fixing and adjusting device, with good controllability and adaptability;The movement of metal mass in x direction is limited by mounting frame, and the vibration in plane and out of plane of hydraulic pipeline is reduced, and the like.

The invention discloses a non-contact characterization method and measurement system for bolt cross-elastoplastic stage relaxation based on third-order perturbation sound modulation, a storage medium and a program product, and the method comprises the steps: sequentially applying low-frequency pumping signals with different amplitudes and high-frequency detection signals with a constant amplitude through an incremental pumping excitation strategy; third-order nonlinear vibration sound modulation response of the bolt connection structure is excited; collecting a vibration response signal of the bolt connection structure by using a non-contact laser vibration meter, performing spectral analysis, extracting amplitudes of a fundamental wave and a first-order sideband signal, calculating a nonlinear index beta, and analyzing the concave-convex characteristic of the beta along with the change of the pumping excitation voltage; distinguishing an elastic relaxation stage and an elastic-plastic relaxation stage of the bolt according to the concave-convex characteristics of the beta curve; a correction modulation index gamma is constructed based on changes of the beta curve under different excitation voltages, and monotonous quantitative characterization of the bolt pre-tightening force in the relaxation process from the elastic-plastic stage to the elastic stage is achieved. The method has the advantage that the continuous, monotonous and quantitative characterization of the whole process from elastoplasticity to elastic relaxation of the bolt is realized.

The application provides a centrifugal compressor self-adaptive microjet device based on resonance driving and a design method thereof, and belongs to the technical field of centrifugal compressors. The centrifugal compressor self-adaptive microjet device based on resonance driving and the design method thereof comprise a volute body and an impeller. A microjet channel is formed in the volute body. The microjet channel comprises a microjet nozzle and a self-adaptive opening in communication with a flow passage. A resonance diaphragm is arranged at the self-adaptive opening. The resonance diaphragm can spontaneously adjust deformation according to the pressure difference of a flow field and the vibration of a rotor system, so as to change the equivalent flow area of the microjet nozzle. The jet intensity is adjusted by using the energy of the flow field itself, the flow loss is reduced, and the nonlinear vibration of the rotor system is inhibited. The multi-working-condition flow field characteristic and energy analysis method is adopted, so that the region of jet intervention can be more accurately positioned. The data sensitivity analysis method and the optimization algorithm are adopted, so that the parameters with greater influence can be distinguished, and the optimal device design can be further refined.

This utility model relates to the field of chip packaging technology, and more particularly to a packaging structure for reducing the total harmonic distortion (THD) of MEMS piezoacoustic devices. The structure includes: a substrate having a hollowed-out cavity, a limiting device, and multiple vent holes at the bottom; and a MEMS sound-emitting chip, inverted and soldered onto the substrate, with its edge region bonded to the substrate via a connection point to form a first acoustic cavity. This utility model provides a packaging structure for reducing the THD of MEMS piezoacoustic devices. The inverted soldering of the MEMS sound-emitting chip effectively reduces the volume while ensuring packaging stability. The diaphragm of the MEMS sound-emitting chip and the substrate form the first acoustic cavity, while the chip, substrate, and shell together form a second acoustic cavity. Through dual-cavity air pressure balance, mechanical limiting, and acoustic path optimization, nonlinear vibration is reduced, significantly lowering the total harmonic distortion (THD) of the MEMS piezoacoustic device and improving sound radiation efficiency.

The application applies to the electronic technical field, and provides a resonant frequency detection method, system, device, product and medium, wherein the method comprises determining a nonlinear vibration frequency through a nonlinear spring stiffness coefficient; obtaining multiple cycle times and multiple amplitude sizes of a detectable parameter of a vibrator; and obtaining the resonant frequency of the vibrator through the nonlinear vibration frequency, the multiple cycle times and the multiple amplitude sizes. In this way, a more accurate resonant frequency can be obtained, so that the vibrator can obtain the strongest kinetic energy using the smallest electric energy when being driven. Moreover, when the vibrator only needs to vibrate for a short time, a corresponding reverse signal can also be obtained according to the obtained resonant frequency, and the residual vibration part of the vibrator can be more accurately offset through the reverse signal, so that the vibrator can stop vibrating faster, and a more crisp vibration effect is obtained, thereby improving the user's tactile experience.

This invention discloses a high-rigidity rotary table saddle for CNC machine tools, belonging to the technical field of machine tool machining parts. The high-rigidity rotary table saddle for CNC machine tools includes a main body with a hollow internal structure. A slide rail is mounted on the top surface of the main body, and a connecting seat is mounted on the bottom surface of the main body. A flat plate is located on top of the main body and is fixedly connected to the inner wall of the main body. An energy storage and stabilizing component is disposed at the center of the flat plate to improve dynamic rigidity and machining stability. Several adaptive components are mounted on the top surface of the flat plate in a symmetrically distributed circular pattern to adapt to nonlinear vibrations generated during machine tool machining. By employing energy storage and stabilizing components and adaptive components, this invention solves the core pain points of traditional saddles—vibration transmission and insufficient dynamic rigidity—while also possessing the advantages of reliable structure and wide applicability. It can directly promote the improvement of stability and efficiency in the machining of high-precision, complex parts in CNC machine tools.

The invention discloses a thin-wall structure dynamic parameter uncertainty quantification and vibration analysis method, relates to the field of aircraft thin-wall structure dynamics in the civil aviation field, and aims to solve the problem that vibration characteristics of an aircraft thin-wall structure in the civil aviation field are difficult to accurately analyze due to the fact that the aircraft thin-wall structure is affected by multi-source uncertainty under complex working conditions. According to the method, the difficulties of uncertainty source coupling, parameter time varying, high dimension and strong nonlinearity of vibration characteristics and the like are analyzed, and corresponding solutions are provided: a multi-source uncertainty coupling analysis framework is constructed to realize accurate description of complex coupling uncertainty; establishing a time-varying uncertainty dynamic updating model, and quantizing parameter time-varying uncertainty in real time; and a high-efficiency high-dimension nonlinear vibration characteristic analysis method is developed, and the calculation cost is reduced. According to the method, the physical mechanism and the machine learning technology are combined, the uncertainty is described by adopting the probability model and the interval model, and the modeling precision of the aircraft thin-wall system structure dynamic model is improved.

The application discloses a movable nonlinear vibration absorber for conductor vibration suppression, comprising a roller assembly and a nonlinear vibration absorber; the roller assembly comprises at least two rollers which are distributed along the circumference of the outer edge of the conductor and are arranged on a roller connecting frame; the nonlinear vibration absorber comprises a nonlinear vibration absorbing unit which is arranged in a vibration absorber connecting frame; the nonlinear vibration absorbing unit comprises a rigid mass ring, a variable cross-section arch and a rigid connecting piece; the variable cross-section arch is arranged above the notch of the inner wall of the vibration absorber connecting frame; the peripheral surface of the rigid mass ring is connected to the arch top of the variable cross-section arch through the rigid connecting piece; and the vibration absorber connecting frame is installed inside and below the roller connecting frame. The geometric nonlinear characteristics of the variable cross-section arch structure are utilized to realize the suppression of the maximum amplitude of the conductor in a wider frequency range by the vibration absorber, and the vibration absorber can be adaptively shifted to the wave crest region along the conductor axis, thereby breaking through the position limitation of the traditional wire clamp fixed vibration absorber, and the structure is simple and easy to realize.

The invention discloses a fuzzy adaptive sliding mode control method and system suitable for a satellite flexible solar wing system, and belongs to the technical field of spacecraft control. Aiming at the nonlinear vibration problem caused by structural flexibility, joint gaps and abrasion of a satellite flexible solar wing and the defects of poor trajectory tracking precision and the like caused by insufficient robustness, obvious buffeting and insufficient adaptive capacity of an existing control method, the method comprises the following steps of: constructing a nonlinear dynamic model for accurately representing complex dynamic characteristics of a system; and designing a fuzzy adaptive sliding mode control method to realize high-precision control of the attitude of the flexible solar wing. The method has the strong robustness of sliding mode control and the dynamic adaptation capability of fuzzy self-adaption, the inherent defects of a traditional control method are effectively overcome, the system operation stability and control precision are improved, and technical support is provided for reliable control of spacecraft flexible components.

The utility model discloses a cleaning mechanism for rotating shuttle production, which belongs to the technical field of rotating shuttles.The cleaning mechanism for rotating shuttle production comprises a device, the output end of a motor penetrates into the device and is connected with a lantern ring mechanism, and the front end of a supporting frame is fixedly connected with a shaking mechanism. A plurality of positioning mechanisms used for fixing the rotating shuttle are fixedly connected into the supporting frame, and an unlocking mechanism is connected to one side of the supporting frame in a sliding mode. A composite motion mode of rotating torque transmission and axial floating is achieved through the lantern ring mechanism, centrifugal cleaning efficiency is kept, a three-dimensional motion track is formed through axial displacement of the second shaft in the sleeve, and cleaning dead corners are effectively avoided. The shaking mechanism generates micro-amplitude vibration through collision vibration of a third ball and a second ball, regular vibration is formed in cooperation with tension of a tension spring, the centrifugal effect advantage is reserved, meanwhile, a dynamic impurity balance layer of an inner cavity of the rotating shuttle is destroyed through nonlinear vibration, and the deep dirt removing effect is remarkably improved.

The invention discloses a stability control method for continuous reconstruction motion of a metamorphic robot based on nonlinear analysis, which comprises the following steps of: 1, establishing a continuous reconstruction kinematics model of the metamorphic robot by using a spinor theory so as to obtain homogeneous coordinates of centroids of all motion components; 2, establishing a pitch angle-vertical displacement two-degree-of-freedom nonlinear vibration model for continuous reconstruction of the metamorphic robot, and deducing an improved ZMP criterion containing foot wheel nonlinear vertical stiffness; and 4, converting the complex continuous reconstruction nonlinear dynamic model of the metamorphic robot into a simple linear system model for adjusting a centroid mechanism through a sliding block expected displacement deviation solver, and further converting the motion control of each leg joint with continuous reconstruction stability into the displacement control of a sliding block in the centroid mechanism. Therefore, stability control over the metamorphic robot in the continuous reconstruction process is achieved through the LQR controller optimized based on the artificial bee colony algorithm.

The application belongs to the technical field of new energy power generation, and relates to a wave energy power generation method and device based on nonlinear vibration. A gravity pendulum is hinged to a sliding block and a suspension rod. A rack gear is arranged in the up-down sliding direction of the gravity pendulum to mesh with a gear transmission, so as to convert heave ocean energy into mechanical energy. An inner ring gear is arranged in the reciprocating swinging direction of the gravity pendulum to mesh with a gear transmission, so as to convert pitch ocean energy into mechanical energy. Then, the two-way mechanical energy torque is coupled through a planetary gear train and used for power generation. The application uses repulsion of a magnet and an inclined spring to construct a nonlinear restoring force, combines a one-way bearing to realize conversion of reciprocating motion into one-way rotation, and combines the rotation speeds of pitch and heave motion through a epicyclic gear train, so as to effectively broaden the frequency bandwidth of wave energy capture and significantly improve the utilization efficiency of wave energy with constantly changing frequency and amplitude.

The invention belongs to the technical field of vibration response analysis of thin-wall structures of hypersonic aircrafts, and particularly relates to a thermo-acoustic-vibration coupling vibration response analysis method for the thin-wall structures of the hypersonic aircrafts, in particular to a thermo-acoustic-vibration coupling nonlinear vibration response calculation method for the thin-wall structures of the hypersonic aircrafts. According to the method, the nonlinear dynamic characteristics of the thin-wall structure under the combined action of the temperature field, the sound pressure and the vibration load can be effectively obtained, so that the calculation and analysis of the nonlinear response characteristics of the thin-wall structure under thermoacoustic vibration are more efficient and quicker, and tedious theoretical derivation and a high-cost test process can be avoided; and a reliable basis can be provided for follow-up dynamic strength evaluation and optimization of the thin-wall structure.