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Multi-channel noise and libration testing method and tester

A vibration test, multi-channel technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of high price, non-concentrated functions and large volume of the noise and vibration test system

Inactive Publication Date: 2007-08-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new multi-channel noise and vibration test system, which integrates multiple test functions and comprehensive analysis method, while ensuring powerful functions, has the advantages of small size, light weight, low cost, and good stability

Method used

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  • Multi-channel noise and libration testing method and tester
  • Multi-channel noise and libration testing method and tester

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Embodiment Construction

[0017] The IEPE sensor in Fig. 1 is the connection diagram of the IEPE sensor and the data acquisition module refers to the pressure sensitive sensor.

[0018] The data acquisition module shown in Figure 2 consists of an operational amplifier circuit and a D / A acquisition module. An operational amplifier and a filter are provided between the sensor and the data acquisition module. The filter is a parallel resistor and a series capacitor at the input of the operational amplifier. The constant current source connected to the non-inverting input of the op amp generally adopts 150±100mA; a 50-ohm resistor is connected in series between the inverting input and the ground.

[0019] The hardware part of the present invention also includes a computer connected with a data acquisition module. The data acquisition module does not analyze the signal, and all analysis processes are processed by software in the computer.

[0020] The method comprises the following steps: (1) the sensor is ...

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Abstract

A method to test multichannel noise and shake based on computer processing has two signal input mode: hardware input and file input used for signal ex post analysis. In hardware input, firstly, take sensor and data collecting module to form continuous data collecting module connected by BNC. Then, connect the module with computer by USB for inputting signal into computer. In file input, program read data from designated file and analyze. Its analyzing process is: set parameters for task, which includes signal analyzing parameters, window function selection of spectrum and coherence analysis, average mode and its parameters, selection of average mode and weighted window function in octave-band analysis. If in hardware input, it needs point file position.

Description

technical field [0001] The invention relates to a noise and vibration collection and analysis system, in particular to a noise and vibration testing method and system that is portable, has a wide dynamic range, and has good stability, and uses computer software for data processing. Background technique [0002] Noise and vibration testing is an important basis for evaluating environmental noise and vibration pollution and selecting control measures. The noise and vibration test system is an important part of the noise and vibration test, and is widely used in noise research and environmental monitoring and other occasions. [0003] Existing testing methods include time-domain signal testing and observation. Display the waveform of the noise or vibration signal, and observe the change of the signal intuitively. spectrum analysis. Spectrum analysis is performed on the signal to obtain its spectrum information, that is, the amplitude and phase value of the signal at a certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 黄华华邹海山邱小军李宁荣
Owner NANJING UNIV
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