13 results about "Ambient vibration" patented technology

This invention relates to the field of optical experimental equipment technology, and particularly to an optical experimental turntable, comprising a base, a rotary worktable mounted on the base, and a drive module disposed on one side of the rotary worktable; the optical experimental turntable also includes an aperture adjustment unit, which is disposed at the upper end of the rotary worktable and used to change the aperture of the light-gathering hole on the rotary worktable. The buffer unit used in this invention can perform two-stage vibration reduction; the vibration damping medium within the buffer frame can release the vibration kinetic energy transmitted by the base through its own vibration, significantly reducing the vibration transmission path. Combined with the elastic buffering effect of the buffer spring, it effectively isolates the interference of external environmental vibration and the vibration of the equipment itself on the optical path.

The present application relates to the technical field of environmental vibration detection, and discloses a micro-vibration prediction system based on actual measurement, comprising: a measuring point arrangement module for arranging external vibration collection points and internal vibration collection points; a data collection module for synchronously collecting vibration response data; a transfer function calculation module for calculating vibration transmission rules and generating a vibration transfer function; a vibration prediction module for converting monitored vibration response data into predicted vibration values; a verification and correction module for comparing actual measurement values with predicted vibration values and dynamically correcting the vibration transfer function according to the comparison results. The present application can truly reflect the actual attenuation rules of vibration sources propagating to sensitive points through geology and structures, avoid errors caused by parameter uncertainty in pure numerical simulation, and give early warnings before vibration events reach sensitive equipment, thus gaining time for production scheduling or active vibration isolation.

The present application belongs to the field of vibration power generation. It relates to a vibration pickup component for vibration power generator, which is composed of a square frame, a support, a vibrator swinging around a point above the center of gravity, and a anti-dropping assembly. It mainly plays the role of expanding the frequency band and picking up low vibration energy. It also relates to a vibration pickup device for electromagnetic vibration power generator and a vibration pickup device for composite vibration power generator, which are both composed of a vibration pickup component and a gimbals. Both of them can make the vibration pickup component pick up the omnidirectional external excitation. The latter also produces multiple types of feedback actions for various power generation units. It also relates to an electromagnetic vibration power generator and a composite vibration power generator. The former is composed of a vibration pickup device for electromagnetic vibration power generator, a permanent magnet, etc. The latter is composed of a vibration pickup device for composite vibration power generator, a permanent magnet, a piezoelectric and friction power generation unit, a wheel disc type friction nano power generation unit, etc. Both of them improve the power generation efficiency of picking up environmental vibration energy.

The application discloses a discrete doll-in-doll type periodic vibration reduction and isolation pile and a laying method thereof, and comprises: a plurality of discrete doll-in-doll type vibration reduction and isolation single piles arranged according to a square lattice; each single pile structure comprises a local resonance concrete layer, a rubber soft layer and a steel pipe wrapping layer which are sequentially and multi-layered nested; the single pile as a whole presents a doll-in-doll type structure, and the cross section of each single pile is circular, and the rubber soft layer is arranged in a discrete type along the ring direction. The pile utilizes the band gap characteristics of the periodic structure to inhibit environmental vibrations with frequencies in the attenuation domain range, so as to reduce the adverse effects of environmental vibrations such as rail transit operation and earthquakes; the pile can break the limitation that the traditional periodic vibration reduction and isolation pile is not conducive to isolating low-frequency vibration waves in a limited site; the pile can make up for the defect that the traditional periodic vibration reduction and isolation pile can only isolate vibrations in a single frequency band, and realizes multi-frequency band vibration reduction and isolation application; the pile has strong geometric variability, can be targeted to attenuate environmental vibrations in different frequency bands, and has good durability and high operability.

This invention provides a vibration power generation device that can maximize output by automatically adjusting the resonant frequency of the vibration power generation element to follow changes in the frequency of environmental vibrations. [Solution] A vibration power generation device (100) comprising a vibration power generation element (10) having a fixed electrode (12) which is a first electrode, a movable electrode (11) which is a second electrode facing the fixed electrode (12), and an elastic support part (14) which elastically supports the movable electrode (11) with respect to the fixed electrode (12) so that it can move relative to it, and a frequency tracking means that makes the resonance frequency of the vibration power generation element (10) follow the environmental vibration frequency (fe).

The application relates to a modular fan device, a modular fan assembly and a use method thereof, and belongs to the technical field of air-cooled heat dissipation of electronic equipment. The application solves the problem that the vibration transmission between a fan and a case causes the fan to be damaged, and the problem that the workload is large when the whole electronic equipment fan is maintained or replaced. Meanwhile, the fan assembly can be modularized to adapt to different needs, the fan assembly is convenient to maintain, the vibration is isolated, and the fan assembly is not sensitive to environmental vibration. The modular fan assembly for electronic equipment is composed of several vibration-isolated fan modules through modular interfaces; each modular fan device comprises a fan cover, a fan body and a vibration isolation system; two kinds of modular interfaces which can be matched and interconnected are arranged on the fan cover, so that the modular fan devices can be assembled at will; and the vibration-isolated fan module is further provided with two kinds of electrical interfaces which can be internally connected for power supply. The application can isolate the vibration generated by the fan during operation from the electronic equipment; meanwhile, various combination modes can be formed to adapt to different needs, and the fan is convenient to maintain and replace.

This utility model provides an intelligent seismic-resistant and shock-absorbing support for building engineering, belonging to the field of seismic support technology. It includes a frame, with a seismic-absorbing fixing component inside the frame to secure building pipelines against vibration, and a stabilizing component at the bottom of the frame to buffer the pipelines. This utility model achieves intelligent seismic resistance and shock absorption for building pipelines through its seismic-absorbing fixing component. Vibration sensors monitor the environmental vibration frequency in real time, transmitting the collected vibration data to a controller. Based on the real-time vibration characteristics, the controller adjusts the damping coefficient of the electric damper, achieving adaptive seismic resistance and vibration reduction. This not only provides precise response to vibrations of different frequencies and intensities but also significantly improves the seismic performance and safety of building pipelines.

The application discloses a global compaction degree nondestructive evaluation method, system, device and medium based on multi-machine vibration signal coupling analysis, comprising the following steps: acquiring detection data of a current period; calculating a local reference wave field according to excitation signal information of each rolling device and a first correlation model; integrating the local reference wave field to obtain a global reference wave field of a construction area based on excitation signal information corresponding to an overlapping grid corresponding to a plurality of local reference wave fields; determining listening parameters of excitation waves of other rolling devices listened to by each rolling device; filtering non-designated environment vibration signals to obtain filtered signals based on the listening parameters; determining transmission parameters of vibration waves across the rolling devices, and forming a supplementary wave field according to the transmission parameters; determining an actual compaction distribution map of a rolling grid in the construction area based on the global reference wave field and the supplementary wave field; determining a priority according to the actual compaction distribution map; and planning a rolling route and rolling parameters of each rolling device in a next period.

This invention belongs to the field of fiber optic sensing technology, specifically relating to a vibration reduction system for reducing the impact of environmental vibration noise on distributed fiber optic acoustic wave sensing equipment. The vibration reduction system includes a passive vibration reduction unit, an active vibration reduction unit, a vibration monitoring unit, and a DAS demodulation and vibration reduction unit. The vibration monitoring unit includes a vibration sensor that collects three-dimensional vibration information of the laser body. The active vibration reduction unit includes four planar piezoelectric actuators, a vibration feedback control module, and a Z-axis piezoelectric actuator. The DAS demodulation and vibration reduction unit includes a DAS demodulation device and a reference fiber roll. This invention effectively solves the problem of vibration interference affecting the demodulation output of the laser body in DAS equipment by combining multiple passive vibration reduction, active vibration reduction, vibration monitoring, and DAS demodulation calculation for vibration reduction.

The application discloses a high-voltage connector fault prediction method, relates to the technical field of fault prediction, and solves the technical problems of incomplete fault mechanism coverage caused by the lack of multi-dimensional sensitive features, inaccurate thermoelectric coupling effect capture, unable to compensate signal transmission delay, lack of dynamic compensation mechanism, and low practicability of prediction results; the interference of environmental vibration is eliminated by extracting the resonance frequency offset of the vibration signal through FFT transformation; a temperature change rate correction term is introduced into the temperature resistance coupling coefficient; the linear coupling features output by the bivariate LSTM and the nonlinear coupling features extracted by the KPLS are combined to construct a thermoelectric coupling feature set, and full-stage coverage of the thermoelectric coupling effect is realized. The improved Transformer model quickly adapts to a new scene through small sample transfer learning. Based on the dynamic compensation coefficient output by the fusion features, the signal transmission delay under the conditions of rapid temperature change and electromagnetic interference can be corrected in real time.

This application provides a vibration source testing and identification method and system based on a vision system, relating to the field of rail transit vibration monitoring technology. This application collects synchronous multi-view image sequences of vibration events of monitored objects such as key sections along the track and sensitive locations of buildings on the track. Then, it selects grating deformation images that are synchronous with the impact excitation and have a signal-to-noise ratio that meets the preset conditions from the image sequence to form an effective image subset. Through phase analysis and three-dimensional reconstruction, it obtains the displacement vector data of each monitoring point on the surface of the monitored object and maps it into physical space displacement time history data. It numerically processes the displacement time history data to generate acceleration time history and extracts visual vibration features. Combined with the vibration wave propagation model, it solves the visual vibration features in reverse to determine the spatial location, action time history, and frequency components of the vibration source, which can realize the accurate identification and parameter determination of vibration sources in the rail transit environment.