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Measure method of pulse force

A measurement method, pulse force technology, applied in the field of precision measurement, which can solve the problems of speed, distortion and lag that limit measurement

Inactive Publication Date: 2005-01-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the voltage signal on the piezoelectric element depends on the metal-coated electrode 2 evaporated on the piezoelectric sheet. With the electrode, there must be capacitance, and the existence of capacitance limits the speed of measurement.
When the pulse force changes rapidly with time and needs to be measured quickly, if the piezoelectric element is used for measurement, distortion and hysteresis will inevitably occur, or the measurement cannot be performed at all

Method used

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Embodiment Construction

[0021] Embodiments are described below with reference to the drawings. The overall structure of the measuring device made according to the method is as follows: figure 2 As shown, it is mainly composed of three parts: test bench, microcomputer 3 and printer 4. The test bench mainly consists of a slider 14 , a guide rail 15 and an additional weight 8 . The guide rail 15 is fixed on the base 10, and the slider 14 can slide along the guide rail 15; the fixed ruler 6 of the precision displacement sensor (grating ruler) is fixed on the base 10, and the moving ruler 5 is fixed on the slider 14, and the precision displacement sensor measures Obtain the displacement X of slide block 14, its reading is passed into microcomputer 3 by cable 7. The microcomputer 3 is provided with a data acquisition card, and the control program block diagram is as follows: Figure 4 As shown, the quartz crystal oscillator required for time measurement is directly installed on the data acquisition car...

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Abstract

By Newton second law, in case of force F to be measured impulsing to a sliding block in mass m, if mass m of the sliding block and acceleration a of the sliding block are measured, then corresponding force can be calculated out from Newton second law. Measuring relation X(t) between displacement X of the sliding block and time t, and differentiating X(t) to time t twice obtain acceleration a. if mass m of the sliding block is known in advance, with acceleration a being obtained, force F can be obtained from Newton second law directly. Otherwise, an attached poise with its weight being known precisely is added to the sliding block, carrying out repeated measurements eliminates factor of known mass m of the sliding block in data processing.

Description

Technical field: [0001] The invention relates to a method for measuring pulse force, which belongs to the field of precision measurement. Background technique: [0002] Impulse force is a common way of applying force in scientific research or industrial engineering. Sometimes it is necessary to precisely measure its specific microscopic form, that is, to measure the distribution of force over time or space. The present invention is successfully developed to meet this requirement. At present, there are not many literatures on pulse force measurement, and the published measurement methods are as follows: figure 1 As shown, it uses the piezoelectric element 1 as the sensitive element, and the voltage on the electrode 2 of the piezoelectric element is proportional to the force F received by it, and the force F is measured by measuring the voltage on the electrode 2 of the piezoelectric element. However, the voltage signal on the piezoelectric element depends on the metal-coate...

Claims

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Application Information

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IPC IPC(8): G01L5/00
Inventor 路峻岭付德永夏忠东
Owner TSINGHUA UNIV