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Excitation method and apparatus thereof of vibrating wire instrument

A vibrating device and vibrating wire technology, which is applied in the direction of instruments, measuring devices, and electric devices, can solve the problems of unreliable vibration of steel wires and single frequency spectrum, so as to improve the ability of precise control, single frequency spectrum, and avoid inability The effect of excitation or over-excitation

Active Publication Date: 2012-02-15
CHINA GEOKON INSTR
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Problems solved by technology

[0006] Aiming at the problem that the existing vibration method for vibrating wire instruments produces pulsed square waves that will introduce harmonics and cause the steel strings to fail to vibrate reliably, a new method for exciting vibrations for vibrating wire instruments is proposed, which can Obtain a sine wave excitation signal with a single spectrum, which improves the precise control ability of the excitation signal

Method used

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  • Excitation method and apparatus thereof of vibrating wire instrument
  • Excitation method and apparatus thereof of vibrating wire instrument
  • Excitation method and apparatus thereof of vibrating wire instrument

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Embodiment Construction

[0034] The present invention will be described below in conjunction with the accompanying drawings.

[0035] image 3 It is the preferred flowchart of the method based on the digitally synthesized sine wave excitation signal of the vibrating wire instrument of the present invention, the method may further comprise the steps:

[0036] A, the microprocessor writes the waveform data of the sine wave (the waveform data of the sine wave to be produced) into the waveform memory RAM by the FPGA / CPLD, and the waveform memory RAM is used to store the waveform data; the FPGA / CPLD includes a logic control module , phase accumulator and frequency control word register, CPLD (Complex Programmable Logic Device, complex programmable logic device) and FPGA (Field Programmable Gate Array, field programmable gate array) are programmable logic devices, of course, you can also choose to include logic Other logic control devices of the control module, phase accumulator and frequency control word ...

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Abstract

The invention relates to an excitation method and an apparatus thereof of a vibrating wire instrument. According to the method, sinusoidal waveform data with adjustable frequency are generated based on a digital synthesis principle; the sinusoidal waveform data is converted into a sinusoidal waveform signal through parallel DA converters; a filter circuit filters and removes higher harmonics and the sinusoidal waveform signal is smoothed into a smoothed sinusoidal waveform signal; and then the smoothed sinusoidal waveform signal is exerted on two ends of a frequency measurement coil of a vibrating wire instrument and an alternative electromagnetic force is generated under the effect of a permanent magnet, so that string wires are driven to generate a resonance. According to the method provided in the invention, a sinusoidal waveform exciting signal with adjustable frequency is generated and an accurate control capability of the exciting signal is improved; and various limitations caused by a pulsed square wave employed in a traditional excitation method.

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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IPC IPC(8): G01H11/02
Inventor 江修沈省三毛良明
Owner CHINA GEOKON INSTR
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