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Linearized string-vibrating force-measuring sensor

A force measuring sensor and vibrating wire technology, applied in the field of sensors, can solve problems such as difficulty in achieving accuracy, difficulty in realization, and increase in equipment configuration, and achieve the effects of no gap error, simple and reliable structure, and improved measurement accuracy.

Inactive Publication Date: 2004-10-06
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many methods for nonlinear compensation processing, mainly including: approximate linearization, interpolation method, differential compensation method, etc. Either it is difficult to achieve the required precision, or it needs to increase the equipment configuration, or it is limited by the hardware, and it is difficult to realize it in some occasions.

Method used

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  • Linearized string-vibrating force-measuring sensor
  • Linearized string-vibrating force-measuring sensor
  • Linearized string-vibrating force-measuring sensor

Examples

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Embodiment Construction

[0026] In the example, the frequency range from 5000 to 10000 Hz is selected, the Jinghu string with a diameter of 0.2 mm and a string length of 30 mm is used as the vibrating string, and the proportional relationship between the input deformation and the output deformation is selected as ΔL: Δl = 1: 10. The geometric relationship between them also determines that the 1 / 2 angle α between the longitudinal bars is 84-85°. In order to make a good match between the "vibration frequency of the vibrating string - deformation curve" and the "input deformation - output deformation curve", the length k of the longitudinal rod in the six-bar structure should also be selected. If the length of k is different, the approximate radius of curvature of the "input deformation-output deformation curve" will be different, and the two are proportional. According to the selected vibrating wire frequency section and the proportional relationship between the input deformation and the output deformat...

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Abstract

The vibrating-wire force-measuring transducer includes vibrating-wire and deformation body for tensioning vibrating-wire, and is characterized by that one end of the bow-shaped deformation body of traditional vibrating-wire transducer is changed into symmetrical hexagonal rod structure, said structure can make the between of delta L and delta I have the non-linear relationship approaching to para-curve so as to make the between of frequency f of vibrating-wire and load T to be tested have approximate linear relationship, so that said invention utilizes the improvmenet of structure to implement non-linear compensation of the vibrating-wire trasducer.

Description

Technical field: [0001] The invention relates to a sensor which reflects the change of the force by changing the frequency of the vibrating wire. Background technique: [0002] The vibrating wire force sensor is a commonly used force sensor, which uses the corresponding relationship between the natural frequency of the vibrating wire and the force on the vibrating wire to measure the force. Its structure is generally to install a tensioned metal wire (as a resonant element, usually called a vibrating wire) on a bow-shaped deformable body. Under electromagnetic excitation, the vibrating wire vibrates at its natural frequency. By changing the tension T of the vibrating wire, different vibration frequencies f can be obtained, that is, there is a functional relationship between the tension and the resonance frequency. Therefore, the force of the sensor can be obtained by measuring the vibration frequency of the vibrating wire, so as to finally achieve the purpose of force meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/10
Inventor 竺长安李胜利徐厚胜杨圣张屹王海
Owner UNIV OF SCI & TECH OF CHINA