A two-dimensional force measuring device and method based on a double-ended fixed quartz tuning fork
A technology of a quartz tuning fork and a force measuring device, which is applied to the measurement of the property force of piezoelectric devices, etc., can solve the problems of a bulky isolation system, breaking the dynamic balance, and reducing the Q value of the system, so as to simplify the structure of the force measuring device and improve the Stiffness and stability, the effect of improving measurement sensitivity
Active Publication Date: 2017-11-21
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology
However, if two-dimensional force measurement needs to be coupled with other structures at the open end, its dynamic balance will be broken and the Q value of the system will decrease
In order to improve the Q value, a relatively bulky isolation system needs to be added to the design
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[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0027] see figure 1 , a two-dimensional force measuring device based on a double-ended fixed quartz tuning fork 2 of the present invention includes two main parts of a mechanical system and an electrical circuit system. Among them, the mechanical system includes a double-ended fixed quartz tuning fork 2 and its bracket, a vibration generator 3 (a piezoelectric ceramic is used specifically) and a measuring probe 4 (a metal probe is used specifically), a Doppler vibration test Instrument 5 and piezoelectric fretting test bench 6. The circuit system includes a first sinusoidal signal generator 7 , a second sinusoidal signal generator 8 , a signal conditioning circuit 9 , a first lock-in amplifier 10 , a second lock-in amplifier 11 , a data acquisiti...
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Abstract
The invention discloses a two-dimensional force measuring device based on a double-ended fixed quartz tuning fork and a method thereof. platform, the first positive and the second sinusoidal signal generator, the signal conditioning circuit, the first and the second lock-in amplifier, the data acquisition module and the computer; the method comprises the following steps: the sample to be tested is placed on the piezoelectric micro-motion test bench , adjust the distance between the piezoelectric micro-motion test bench and the measuring probe; adjust the vibration frequency and amplitude of the first and second sinusoidal signal generators; continuously adjust the height of the piezoelectric micro-motion test bench to make it Approach the measuring probe; the computer starts to record the vibration amplitude and phase change information; then calculate the axial force Fn and the shear force FS in the horizontal direction. The invention can realize the two-dimensional force measurement of the axial force and the shear force of the liquid phase material, can obtain a higher Q value, and thereby obtain a higher sensitivity.
Description
technical field [0001] The invention relates to a measuring device and method for axial force and shear force of a liquid-phase material, in particular to a two-dimensional force measuring device and method based on a double-ended fixed quartz tuning fork. Background technique [0002] In mechanical transmission, fluid lubricants such as rolling bearings play an important role in isolating friction pairs, reducing wear and prolonging mechanical life. With the precision and high-speed development of mechanical equipment, the requirements for its working environment and conditions are becoming increasingly stringent, the thickness of the lubricating film in the mechanism is continuously decreasing, and the requirements for lubricating performance are increasing. The change of axial force and shear force during lubricant work can reflect the lubricating effect of lubricant, so the measurement of axial force and shear force is an important means to study the performance of lubri...
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IPC IPC(8): G01L1/16
Inventor 刘卿卿苗国英
Owner NANJING UNIV OF INFORMATION SCI & TECH