Laser method for measuring vibration displacement of rolling bearing

A vibration displacement, laser measurement technology, used in vibration testing, mechanical bearing testing, measuring devices, etc., can solve the problems of unstable measurement system, low frequency response, difficult application, etc., to avoid instability and easy to ensure accuracy. , easy to use effect

Inactive Publication Date: 2005-10-26
ZHEJIANG UNIV
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Problems solved by technology

The problem is that the frequency response of the mechanical vibration pickup cannot be too high, and the contact installation method of the sensor also causes the instability of the measurement system
In order to improve the shortcoming of the low frequency response of the system, a magnetic suction clamping method of the sensor has appeared, but the system is complicated, inconvenient to disassemble and assemble, and the application is more difficult, and it is necessary to add a demagnetization process

Method used

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  • Laser method for measuring vibration displacement of rolling bearing
  • Laser method for measuring vibration displacement of rolling bearing

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Taking advantage of the small divergence angle of the reflected laser, a PSD position sensor is placed at the end of the reflected laser to measure the tiny displacement during the vibration process. Since the measurement sampling frequency is much higher than the maximum vibration frequency of the bearing measurement, the maximum vibration frequency is given by the measurement standard, so the measurement results can reflect the amplitude and frequency of the bearing vibration.

[0019] Such as figure 1 , figure 2 As shown, in the present invention, the tested bearing 3 is installed on the rotating shaft 2 of the test bench (such as the s0910 type bearing vibration measurement test bench), and the thrust device 4 is loaded from the end face of the tested bearing 3, so that the outer surface of the tested radial bearing 3 There is no ...

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Abstract

The invention discloses the laser testing method of the roller bearing vibration displacement. Equip the bearing on the spin axis of the test bed; makes use of the reflection of the laser through the bearing surface to arrive the PSD sensor surface; the PSD position sensor gives the facula position. The internal loop and the main axis of the bearing can be viewed as the rigid body because the radial force carried by the external loop of the bearing. When the spin axis spins, the inner and the external loops and the roller bring about the vibration and reflect the displacement s of certain point of the bearing surface by the PSD sensor. The invention has simple structure, clear principle and high precision.

Description

technical field [0001] The invention relates to mechanical vibration measurement, in particular to a laser measurement method for vibration displacement of a rolling bearing. Background technique [0002] Bearing vibration measurement generally has two types of measurement methods: velocity type and acceleration type. The principle is to use magnetic velocity measurement sensor and piezoelectric crystal acceleration sensor respectively. But in any case, it is necessary for the vibration pickup to be in contact with the outer surface of the bearing, and to maintain a certain degree of combination, that is, a certain rigidity, so as to improve the frequency response of the system. The existing problems are: the frequency response of the mechanical vibration pickup cannot be too high, and the contact installation method of the sensor also causes the instability of the measurement system. In order to improve the shortcoming of the low frequency response of the system, a magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 张建忠汪久根
Owner ZHEJIANG UNIV
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