16 results about "Vibrational resonance" patented technology

This invention relates to the field of gearboxes, specifically to an intelligent fault diagnosis method for gearboxes. The method includes: acquiring the original vibration signal of the gearbox; performing secondary sampling processing on the original vibration signal to obtain a first signal; inputting the first signal and a high-frequency auxiliary signal into a dynamic vibration resonance system to obtain an output signal, wherein the dynamic vibration resonance system is constructed based on a dynamic potential function, and the steady-state type of the dynamic potential function is controlled by dynamic parameters; acquiring the spectrum of the output signal; and performing gearbox fault diagnosis based on the spectrum. The technical solution of this application can significantly improve the enhancement effect and identification reliability of early weak fault characteristics in gearboxes, and has better environmental adaptability and diagnostic performance.

An apparatus includes at least one actuator configured to generate vibrations over a range of vibration frequencies. The at least one actuator includes a housing configured to be positioned on or within a recipient's body. The actuator further includes a support portion configured to be in operative communication with a fixture implanted within the recipient's body. The actuator further includes an oscillator within the housing, the oscillator includes piezoelectric material and has a first portion in mechanical communication with the support portion and a second portion spaced from the support portion. The piezoelectric material is configured to undergo bending oscillations in response to received electric voltage signals in which the second portion moves relative to the first portion. The actuator further includes at least one damper configured to damp at least one vibrational resonance of the at least one actuator over at least a portion of the range of vibration frequencies and independently of spring damping by the piezoelectric material.

The application discloses a gate self-vibration frequency considering bottom seal water leakage flow excitation vibration resonance judgment method and device. The method obtains a flow field agent excitation signal of a to-be-measured structure under a preset fluid boundary condition and a vibration response signal synchronously collected; an excitation main frequency and a corresponding excitation initial phase are extracted based on the flow field agent excitation signal; a same-frequency response phase is extracted from the vibration response signal based on the excitation main frequency; an excitation response phase difference between the same-frequency response phase and the excitation initial phase is calculated, and the excitation response phase difference is mapped to a preset main value interval to obtain a normalized phase difference; finally, the normalized phase difference is compared with a preset theoretical resonance phase difference to determine whether resonance occurs. The application avoids the interference of a contact type sensor on a slit flow field and the damping sensitivity defect of traditional amplitude judgment, and realizes high-precision automatic positioning of a resonance critical point under a complex fluid-solid coupling working condition.

A steel fiber vibration process and temperature control synchronous optimization method for segment production belongs to the technical field of steel fiber concrete processing, and the method comprises the following steps: vibration sensors and temperature sensors are arranged on the chute of the hopper and the vibration head of the vibration table respectively to construct a multi-point sensing network covering the chute conveying, the vibration output and the internal and external temperature of the concrete. Sensor signals from the multi-point sensing network are received, and the phase difference between different positions on the chute of the hopper is calculated based on the sensor signals to estimate the phase error. Based on the phase error, driving instructions are generated; the driving instructions are used to control the vibration phase advance, the vibration frequency adjustment and the vibration time length adjustment. The present application synchronizes or stagger peaks of the vibrator vibration phase and the chute vibration phase of the hopper through phase error locking, so that the two vibrations "resonate" or "cancel out", effectively avoiding the secondary sliding accumulation of the chute sidewall fibers.

The utility model discloses an anti-interference buzzing sheet structure, which comprises a metal substrate and a ceramic sheet assembly adhered through conductive adhesive, four corners of the front surface of the metal substrate are fixedly connected with anti-interference mechanisms, each anti-interference mechanism comprises a screw assembly, the rear side of the surface of each screw assembly is in threaded connection with a first nut, and the rear side of the surface of each screw assembly is in threaded connection with a second nut. The surface of the screw assembly is sleeved with an anti-interference pad, the back face of the anti-interference pad is fixedly connected with a round pasting assembly, the back face of the round pasting assembly makes contact with the ceramic chip assembly, the front side of the surface of the screw assembly is in threaded connection with a second nut, and the second nut is located on the front face of the anti-interference pad. According to the buzzing piece, the phenomenon that interference resistance cannot be performed on external mechanical vibration in the prior art is changed, and the anti-interference pad and the round pasting assembly are adopted for anti-interference processing, so that vibration resonance between the buzzing piece and the external is not caused, extra noise is not generated, and the use quality of the buzzing piece is not influenced.

This invention discloses a performance optimization method for a tristable energy harvester under low-frequency excitation based on vibration resonance, belonging to the field of energy harvester optimization. The implementation method is as follows: a standard rectifier circuit is selected as the nonlinear collection circuit and connected to the energy harvester to achieve a stable DC output; a strongly nonlinear system model of the electromechanical coupled tristable energy harvester system is established; the slow variable equation of the tristable energy harvester system is derived using the variable separation method; the steady-state solution and analytical expression of the DC power of the tristable energy harvester system are derived using the harmonic balance method; an optimization model of the tristable energy harvester system under low-frequency excitation is obtained based on vibration resonance; the influence of low-frequency excitation amplitude, low-frequency excitation frequency, stiffness coefficient, time constant ratio, and electromechanical coupling coefficient on the collection performance of the tristable energy harvester system is analyzed using the optimization model, and the optimal combination is selected to achieve efficient energy harvesting of the tristable energy harvester system under low-frequency excitation.

The invention relates to the technical field of vibration durability limit tests, in particular to a structural member vibration durability limit test method and device based on resonant frequency, and the method comprises the steps: carrying out a whole vehicle smoothness frequency sweep test on a four-column actuator, arranging sensors at the periphery of a to-be-tested member, and carrying out the data collection and analysis, thereby obtaining the vibration durability limit of the to-be-tested member. Acquiring a resonant frequency for simulating the vibration of the to-be-tested examination piece; the method comprises the following steps: selecting a chassis sample piece according to test requirements for assembling and connecting, manufacturing a fixture according to the structural characteristics of different pieces to be tested and fixing the pieces to be tested, carrying out a verification test by using a vibration test bench by taking the pre-obtained vibration resonance frequency of a point to be tested as a test parameter, and continuously testing until the pieces to be tested have faults and reach a limit damage state, therefore, the technical consistency and the product reliability are ensured, the efficiency of the vibration durability limit test of the structural member is improved, and the problems of incomplete test environment simulation, large road condition simulation limitation and the like in related technologies are solved.

Method and systems are described that obtain or collect time-series vibration data related to operation of a downhole drilling system and convert the time-series vibration data to frequency domain vibration data. The frequency domain vibration data can be evaluated to determine one or more vibrational resonance frequencies as well as corresponding non-aliased harmonic frequencies (if and when present) and aliased harmonic frequencies (if and when present) in the frequency domain vibration data. Change in the one or more vibrational resonance frequencies in the frequency domain vibration data over time can be monitored during the drilling operations to detect or predict the occurrence of a defect or failure or other unwanted conditions (e.g. HFTO) in the drilling system. A health alert can be generated in response to the detection or prediction of the occurrence of a defect or failure or other unwanted condition in the drilling system.

The invention discloses a force balance mode hemispherical resonator gyroscope signal processing method based on vibration resonance, and belongs to the technical field of gyroscope signal processing. The invention aims to solve the problem of how to retain useful signals while realizing a filtering effect in the processing of angular rate signals of the hemispherical resonator gyroscope. Comprising the following steps: constructing a continuous over-damping bistable vibration resonance system based on a continuous original input signal and a set continuous high-frequency driving signal; determining system parameters and parameters of high-frequency driving signals; converting the continuous over-damping bistable vibration resonance system into a discrete over-damping bistable vibration resonance system; calculating four intermediate slopes of a fourth-order Runge-Kutta method according to the discrete mixed signal at the current moment and the discrete output signal of the system at the adjacent previous moment, and further calculating to obtain the discrete output signal of the system at the current moment; and calculating according to a discrete output signal of the system at the current moment to obtain a discrete angular rate subjected to vibration resonance processing. According to the invention, the signal-to-noise ratio of the signal is improved.

A modular micro-factory swarm for autonomous urban construction is disclosed. Each unit is a self-assembling robotic tile that (i) 3D-prints structural elements from locally characterized feedstock, (ii) powers itself via a dual renewable system (deployable photovoltaic array and hydrogen electrolysis / fuel-cell), and (iii) communicates over a mesh network for coordinated tasking. A cost-based planner assigns paths and jobs to minimize energy, time, and terrain risk. After each extrusion, the tile runs on-board structural checks (ultrasonic echo and vibrational resonance) and records pass / fail metrics. Build provenance is bound cryptographically: a hardware security module signs a build object identifier that hashes tile ID, task node, material signature, time, and location; signed records are committed to a distributed ledger. Actuation is gated by location-specific consent tokens verified against policy maps before printing proceeds. The architecture enables peer-to-peer orchestration, verifiable quality control, and closed-loop energy autonomy, reducing reliance on infrastructure and supervision.

The invention discloses a bottom waterstop leakage flow-induced vibration resonance judgment method and device considering gate natural vibration frequency. The method comprises the following steps: acquiring a flow field agent excitation signal of a to-be-tested structure under a preset fluid boundary condition and a synchronously acquired vibration response signal; extracting an excitation main frequency and a corresponding excitation initial phase based on the flow field agent excitation signal; extracting a same-frequency response phase from the vibration response signal based on the excitation main frequency; calculating an excitation response phase difference between the same-frequency response phase and the excitation initial phase, and mapping the excitation response phase difference to a preset main value interval to obtain a normalized phase difference; and finally, comparing the normalized phase difference with a preset theoretical resonance phase difference, and judging whether resonance occurs or not. According to the method, the interference of a contact type sensor on a slit flow field and the damping sensitivity defect of traditional amplitude judgment are avoided, and high-precision automatic positioning of the resonance critical point is achieved under the complex fluid-solid coupling working condition.

To provide a projection apparatus that has a simple configuration and has reduced flicker in a projected image.SOLUTION: A projection apparatus includes a light source, a light modulation device, a projection unit, a fan, a control unit, and a housing. A vibration sensor is attached to the fan. A resonance range in which vibration resonates in the housing is detected by the vibration sensor. In duty ratio setting of a drive signal for driving the fan, the control unit drives the fan using the drive signal having a duty ratio that avoids a resonance duty ratio corresponding to the resonance range.SELECTED DRAWING: Figure 4

The application discloses a bearing fault diagnosis method of a vibration resonance auxiliary enhanced random resonance coupling system and belongs to the technical field of mechanical fault diagnosis, and comprises the following steps: collecting rolling bearing vibration signals by using a sensor, performing Hilbert envelope demodulation processing on the collected rolling bearing vibration signals to obtain amplitude envelopes of the vibration signals; a matching steady-state random resonance system is constructed, and the vibration resonance system and the matching steady-state random resonance system are combined into a coupling system through a nonlinear coupling mode; the obtained amplitude envelopes are taken as input signals of the constructed coupling system, and an optimization algorithm is adopted to realize optimization selection of multiple parameters of the system; the obtained optimal parameters are substituted into the coupling system, the amplitude envelopes are processed, spectrum analysis is performed on system outputs, and effective identification and diagnosis of rolling bearing faults are completed. The application can realize effective extraction of weak fault characteristics in rolling bearing vibration signals, and provides an effective solution for early weak fault diagnosis of rolling bearings.

The application provides a track bed resonator setting method, characterized by comprising the following steps: S1, simultaneously performing vibration tests on a track line when a train is running thereon and on buildings near the track line which are sensitive to vibration caused by the train, so as to obtain vibration data; S2, determining a setting range of the track bed resonator according to the vibration data measured in step S1; S3, performing frequency domain analysis on the vibration data at the sensitive points, so as to determine indoor vibration resonance natural frequencies of the buildings at the sensitive points which are affected by the train; S4, designing the track bed resonator according to the indoor vibration resonance natural frequencies, so that the natural frequency of the track bed resonator is equal to the indoor vibration resonance natural frequencies; and S5, installing the track bed resonator on a track bed in the setting range along an extension direction of the track line.

The invention discloses a steel pipe pile design method and device for restraining vortex-induced vibration, equipment and a medium. The design method comprises the following steps: acquiring a plurality of ocean current flow velocities within a preset time, and determining an ocean current flow velocity range; according to the ocean current flow velocity range, the vortex falling frequency range of the steel pipe pile is determined; determining the inherent frequency of the steel pipe pile; when the inherent frequency of the steel pipe pile is within the vortex falling frequency range of the steel pipe pile, the target frequency of the steel pipe pile is determined; according to the inherent frequency and the target frequency of the steel pipe pile, the actual filling height of the filling material is determined; and according to the actual filling height, filling materials are controlled to fill the steel pipe piles. According to the method, additional devices are avoided, the critical flow velocity range of vortex-induced vibration resonance is narrowed only by changing the structure of the steel pipe pile, and the vibration amplitude is reduced.

Method and systems are described that obtain or collect time-series vibration data related to operation of a downhole drilling system and convert the time-series vibration data to frequency domain vibration data. The frequency domain vibration data can be evaluated to determine one or more vibrational resonance frequencies as well as corresponding non-aliased harmonic frequencies (if and when present) and aliased harmonic frequencies (if and when present) in the frequency domain vibration data. Change in the one or more vibrational resonance frequencies in the frequency domain vibration data over time can be monitored during the drilling operations to detect or predict the occurrence of a defect or failure or other unwanted conditions (e.g. HFTO) in the drilling system. A health alert can be generated in response to the detection or prediction of the occurrence of a defect or failure or other unwanted condition in the drilling system.