Multi-channel synchronous vibration data collecting system

Abstract

The invention discloses a multi-channel synchronous vibration data collecting system which comprises signal front-end processing modules, a singlechip integration control module, a data communication module and a collection computer; two signal front-end processing modules and one singlechip integration control module form a collecting card; a plurality of the collecting cards are inserted and connected on a shared address, data, clock and triggering bus; one end of the data communication module is also inserted and connected on the shared address, data, clock and triggering bus while the other end thereof is connected with the collecting computer by a USB communication wire; the collecting system can completely meet vibration signal collecting requirement and simultaneously has multiple sampling channels and the function of collecting synchronous signals; the collecting system also has program control function, can meet the need of different sensor types, has high collecting speed, small volume and two collecting functions of common real-time collection and transient collection, can not only be applied to low-frequency vibration test, but also suitable for high-frequency vibration tests such as crash, explosion and the like.

Description

technical field [0001] The invention relates to the technical field of vibration testing, in particular to a synchronous acquisition system of multi-channel vibration signals. Background technique [0002] Vibration is a dynamic physical phenomenon that widely exists in nature and human social life. It is a reciprocating motion in a certain equilibrium position that we observe. In many cases, mechanical vibration will cause harm. It affects the function of precision instruments and equipment, reduces the accuracy and surface quality of machined parts, and aggravates fatigue damage and wear of components, resulting in component damage and accidents. In addition, with the continuous emergence of high-rise flexible buildings, ultra-low frequency, large amplitude, and multi-parameter vibration measurements have attracted more and more attention from the engineering community. The research on these vibration characteristics belongs to the research category of ultra-low frequency...

AI Technical Summary

Problems solved by technology

For example, a charge output sensor needs to be equipped with a charge amplifier when used. Most of the multi-channel charge amplifiers currently on the market are large in size and expensive; most of the multi-channel data acquisition systems are voltage input, and rarely have a charge sensor input. interface

[0003] In the prior art, the current main data acquisition system research is roughly as follows, (1) Guo Hong, Design of Multi-channel Synchronous Data Acquisition System Based on USB2.0, Journal of Wuhan University of Science and Technology (Natural Science Edition), 2006 (5): 496- 499; provides a method for establishing a synchronous data acquisition system, but it only has four sampling channels, which cannot meet the needs of the field of vibration testing

(2) Li Chunmei, Development of multi-channel high-precision data acquisition system based on USB2.0, master thesis of University of Electronic Science and Technology of China, 2007; gave the overall scheme of data acquisition and the model circuit of front-end analog signal processing, and its analog processing circuit design It does not have program control function and cannot meet different sensor types; it has only 8 acquisition channels, and it uses polling to realize the acquisition of multi-channel signals, and the acquired signals are not synchronous

(3) The inventors are Zhao Luocheng, Li Xiaoming, Zeng Weimin, multi-channel data acquisition method and device, Chinese patent literature, publication number is CN 1584815, and the publication date is February 23, 2005; it introduces a multi-channel data acquisition system The design method adopts modular design, and makes the analog signal processing part, the data conversion part and the control part into modules. One data conversion module can connect two or more analog signal processing modules, and use the analog switch to switch each analog channel. The signal of each channel can be realized; the master controller can be connected with multiple data conversion modules, and the acquisition of multiple channel signals can be realized through this cascading method, and the modules can be expanded and replaced according to the needs; but this is limited to The acquisition of asynchronous signals cannot achieve synchronous acquisition, and the data acquisition speed is not high, which cannot meet the requirements of vibration signal acquisition

(4) The inventors are Cai Yuanwen, Zhang Yingxin, Chen Sheng, etc., multi-channel data acquisition method system and method, Chinese literature: the publication is CN101169635, and the publication date is April 30, 2008; it introduces the design of a data acquisition system The method adopts the form of collecting card installed on the mainboard slot of the desktop computer to realize data collection, and there are multiple ADCs on the collecting card, which can realize multi-channel synchronous signal collection, and also have record analysis and network transmission functions; but limited by the collecting card Due to the limitation of the volume and its own hardware resources, the number of channels on an acquisition card has a certain limit. Installed in a desktop computer, it is bulky and does not meet the requirements of portability

[0004] In short, in the prior art, there is no vibration data acquisition system that can adapt to the field of vibration testing, meet the requirements of vibration signal acquisition, and have multiple sampling channels and synchronous signal acquisition at the same time, and the existing vibration data acquisition system does not have program control function, unable to meet different sensor types, the acquisition speed is not high, and does not have the transient acquisition function; the front-end signal processing function is single, the degree of intelligence is low, and the number of synchronous acquisition channels is limited; and each processing module is made into a separate system. It is necessary to connect various systems, resulting in the bulky size of the entire measurement system, cumbersome wiring, reduced overall intelligence of the system, inconvenient use, increased human failure rate, and greatly increased costs

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