10 results about "Piezoelectric accelerometer" patented technology

The invention discloses a low-Q-value piezoelectric accelerometer and a preparation method, and the low-Q-value piezoelectric accelerometer comprises a base which is of a hollow structure with the upper end and the lower end being open; the movement assembly comprises a cantilever assembly and a mass block connected to the cantilever assembly; an upper air damping layer is formed in the area where the upper clamping plate layer and the motion assembly coincide in the projection direction; the lower clamping plate layer is connected with the bottom of the base in a bonding mode, a gap exists between the lower clamping plate layer and the mass block, and a lower air damping layer is formed in the overlapped area of the lower clamping plate layer and the mass block in the projection direction. According to the low-Q-value piezoelectric accelerometer provided by the embodiment of the invention, the air damping layers are respectively formed above and below the motion assembly, so that the total damping value of the system is increased, the purpose of reducing the Q value is achieved, the low-Q-value piezoelectric accelerometer is obtained, and the increase of the response bandwidth of the accelerometer is realized.

The invention belongs to the technical field of bearing vibration measurement, and particularly relates to a rolling bearing vibration signal rapid acquisition structure. The device comprises an outer claw mechanism, an inner claw mechanism, a sealing cover, an electromagnetic lifting mechanism and a tested bearing. A flange plate of the outer claw mechanism is connected with a triangular plate of the inner claw mechanism, and a sealing cover is arranged on the flange plate. Guide sliding grooves are formed in the triangular plate and the flange plate, the inner claw fingers and the outer claw fingers can freely slide along the guide sliding grooves, and clamping of rolling bearings of different sizes can be completed; the electromagnetic lifting mechanism penetrates through the flange plate, the triangular plate and a center hole of the sealing cover, and taking, releasing, lifting and falling of the bearing are controlled through electromagnetic attraction. The device can adapt to rolling bearings of different sizes, meanwhile, the piezoelectric acceleration sensors are arranged in the rigid claws, multi-point real-time collection of vibration signals can be achieved, and the device has the advantages of being high in applicability, efficiency and precision.

The invention provides a performance test method for heat pump assembly equipment. The method comprises the following steps: deploying a multi-source sensor at a key part of a compressor to obtain an initial real-time working condition monitoring signal; piezoelectric acceleration sensors are arranged at key nodes of a pipeline of the compressor, and a vibration spectrum monitoring network is constructed to obtain vibration signals; establishing a vibration transmission path model based on a modal analysis theory, and performing transmission trend prediction on the vibration signal to obtain a damping compensation coefficient; performing optimization adjustment on the initial real-time working condition monitoring signal according to a signal source deployment position, and extracting real-time working condition characteristics by combining a wavelet denoising algorithm; inputting the real-time working condition characteristics into an LSTM-based coupling model to predict a transient performance change trend, and obtaining a transient performance characteristic sequence; and generating a dynamic performance change curve and a corresponding performance diagnosis report based on the transient performance feature sequence. Through intelligent heat pump equipment performance evaluation, the equipment operation state is optimized, and the equipment reliability and operation efficiency are improved.

1. Name of the product in this design: Piezoelectric accelerometer. 2. Purpose of this design: For use in sensors. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

A shear mode piezoelectric accelerometer includes a ring-shaped piezoelectric element, a central shaft, a mass block, a first electrode, and a second electrode. The ring-shaped piezoelectric element includes an outer ring wall and an inner ring wall. The central shaft is made of conductive material and is fixed through the inner ring wall of the ring-shaped piezoelectric element. The mass block is made of conductive material and includes a fixed element and a weight element. The fixed element has a fixed hole and is fixed to the outer ring wall of the ring-shaped piezoelectric element by fitting the fixed hole. The weight element is located on the fixed element on the opposite side away from the fixed hole. The first electrode is electrically connected to the central shaft. The second electrode is electrically connected to the mass block.

The invention relates to a pipeline water leakage positioning method, which comprises the following steps of S1, installing piezoelectric accelerometer sensors at valves at two ends of a pipeline, and collecting sound signals in the pipeline; s2, performing MFCC (Mel Frequency Cepstrum Coefficient) feature extraction on the sound signals acquired by the two sensors to obtain a feature sequence corresponding to each sensor, and merging the MFCC feature sequences of the two sensors as the input of a model; s3, the merged feature sequence is input into a pipeline water leakage detection model for analysis, the water leakage detection model comprises an input projection layer, a causal convolution layer and a dynamic state space modeling layer (based on the Mama algorithm), dual-channel dynamic fusion, Mama dynamic state space and physical sensing position coding are adopted, synchronous detection and positioning are output in a multi-task joint mode, and the detection accuracy is improved. Sensitivity is improved, positioning errors are reduced, and real-time performance and multi-working-condition robustness are achieved.

The invention discloses laminated co-fired piezoelectric ceramic with a hole in the center and application of the laminated co-fired piezoelectric ceramic in a piezoelectric acceleration sensor. The piezoelectric ceramic is prepared from at least two kinds of piezoelectric ceramic powder with different phase transition temperatures. The method comprises the following steps: preparing ceramic slurry from piezoelectric ceramic powder; preparing the ceramic slurry into a thin film through a tape casting process to obtain a film belt; cutting the film belt, printing an upper electrode structure, then stacking and hot-pressing the film belt by adopting an interdigital electrode mode, cutting the hot-pressed film belt into single independent laminated ceramic, and forming a circular through hole in the center of the single laminated ceramic; carrying out high-temperature sintering on the single laminated ceramic, and then polishing the end surface of the laminated ceramic; and finally, arranging an end electrode on the end surface of the laminated ceramic and carrying out polarization treatment to obtain the perforated laminated co-fired piezoelectric ceramic. The piezoelectric ceramic is designed for the piezoelectric acceleration sensor, and can meet the comprehensive performance requirements of the piezoelectric acceleration sensor on high sensitivity, wide band and high reliability.

The invention provides a sensing device for monitoring the pile sinking effect of an offshore pile foundation, and relates to the field of ocean engineering and geotechnical engineering monitoring, the sensing device comprises a main floating platform, a plurality of vertical multidirectional diversion positioning columns are fixedly arranged at the bottom of the main floating platform, and the multidirectional diversion positioning columns are vertically arranged; the multidirectional flow guide positioning columns play a role in preliminary fixing and positioning, and a pile driver connector base is fixedly arranged at the top of the main floating platform. Precise positioning and environment adaptation are achieved through the multi-direction flow guide positioning column, a high-frequency piezoelectric accelerometer and a waterproof strain gauge are arranged in the integrated sensing pile body, shear thickening fluid buffering protection is matched, it is ensured that data are continuous and reliable under the extreme working condition, meanwhile, the soil-water coupling monitoring unit captures pile periphery soil stress and pore water pressure changes in real time, and the monitoring precision is improved. And the pile sinking effect is revealed.

The application belongs to the technical field of electric digital data processing, and discloses a piezoelectric accelerometer signal conditioning method and circuit for low-frequency vibration measurement.The method comprises the following steps: selecting multiple IC piezoelectric accelerometers to be reversely docked and installed, forming two branches, and being used in pairs so that the sensed alternating acceleration signals are opposite to each other; using matched transistors to form a multi-channel constant current source for power supply; using multiple instrument amplifier chips to form a differential amplification circuit, adopting a direct current coupling connection form, introducing the signals of multiple IC piezoelectric accelerometers into the differential amplification circuit, doubling the sensitivity of the alternating acceleration signals while offsetting the direct current bias voltage; the similar direct current bias voltages are subtracted to be zero; and using the high common mode rejection ratio characteristic of the instrument amplifier chip, the common mode noise is further suppressed through two-stage differential amplification.The application further suppresses the common mode noise through two-stage differential amplification, and improves the signal-to-noise ratio of a low-frequency broadband test signal.

The application provides a kind of three-dimensional piezoelectric fiber acoustic sensor based on axial polarization, comprising: first shell, second shell, hanger, filler, piezoelectric accelerometer and electrode device;Second shell is fixed in first shell by hanger, and the filler is filled between the second shell and the first shell;Piezoelectric accelerometer includes communication block, three polarized piezoelectric fibers, balancing piece and acoustic signal receiving ball, communication block is supported in the second shell by support column, three polarized piezoelectric fibers are mutually orthogonal, and one end is fixed on communication block, the other end is connected with acoustic signal receiving ball through second shell along first direction, second direction and third direction respectively, and the balancing piece is fixed on the communication block;The electrode device is wrapped on the surface of the polarized piezoelectric fiber.The sensor structure of the application is small, can detect low frequency signal, and has high sensitivity to acoustic signal, and is suitable for industrial production.