Vibration method and device for a vibrating wire instrument

A vibrating device and vibrating wire technology, which is applied in the direction of instruments, measuring devices, and electric devices, etc., can solve the problem that the steel string cannot be reliably vibrated, and achieve the effect of improving precise control ability and eliminating harmonic interference

Inactive Publication Date: 2011-12-21
CHINA GEOKON INSTR
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  • Abstract
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Problems solved by technology

[0006] The present invention aims at the problem that the steel string cannot be reliably vibrated due to the introduction of harmonics by the excitation square wave generated by the excitation method of the existing vibrating wire instrument, and proposes a new type of excitation method for the vibrating wire instrument. The output waveform has less harmonics and has a good vibration effect

Method used

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  • Vibration method and device for a vibrating wire instrument
  • Vibration method and device for a vibrating wire instrument
  • Vibration method and device for a vibrating wire instrument

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Embodiment Construction

[0035] The present invention will be described below in conjunction with the accompanying drawings.

[0036] image 3 For the method flowchart of the SPWM wave excitation signal that the DSP of the vibrating wire instrument of the present invention realizes, the method may further comprise the steps:

[0037] A. Adopt high-performance DSP, make full use of the built-in PWM module of DSP and its high-speed processing ability, and generate SPWM wave by DSP; the carrier frequency of SPWM is generated by DSP according to the excitation frequency, and the pulse width of sinusoidal change is calculated by DSP in real time Generate; wherein, the main program flow chart of DSP generating SPWM wave is as follows Figure 4 As shown, the interrupt program flow chart is as follows Figure 5 As shown, in the main program flow chart, DSP needs to initialize PWM pins, system control registers, set timer interrupts, and event managers (including period registers, comparison registers, count...

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Abstract

The present invention relates to an excitation method and device of a vibrating wire instrument. The method generates a SPWM wave, and then filters the generated SPWM wave through a filter circuit to obtain a sinusoidal waveform signal, and then applies the sinusoidal waveform signal to the vibrating wire instrument. The two ends of the frequency measuring coil in the instrument generate alternating electromagnetic force under the action of the permanent magnet, which drives the steel string to generate resonance. The SPWM waveform excitation signal whose pulse width changes according to the sinusoidal waveform rule generated by the method improves the precise control ability of the excitation signal and solves various limitations caused by the traditional excitation method using a pulse square wave.

Description

technical field [0001] The invention relates to the technical field of health monitoring of geotechnical engineering, in particular to an exciting method and device for a vibrating wire instrument used in safety monitoring instruments of geotechnical engineering. Background technique [0002] In the safety monitoring of geotechnical engineering, safety monitoring instruments such as vibrating wire (or steel string) instruments are usually used to monitor physical quantities such as stress and strain, temperature, joint opening, leakage and deformation of geotechnical engineering. To analyze and judge the safety of geotechnical engineering. [0003] Vibrating wire instruments (or vibrating wire transducers) consist of a homogeneous steel string fixed at both ends. The length of the steel string is L. When sensing the external force F (which can be the stress and strain of geotechnical engineering, temperature, joint opening, leakage and deformation, etc.), the steel string w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/02
Inventor 江修沈省三毛良明
Owner CHINA GEOKON INSTR
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