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Introduced capacitive device for measuring horizontal ground micro-vibration

A capacitive and capacitive sensor technology, used in measuring devices, using electrical devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as being unsuitable for vibration testing of large-volume objects, and achieve fast measurement speed, simple structure, high frequency Responsive effect

Active Publication Date: 2013-04-03
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

The non-contact capacitive displacement sensor has many excellent characteristics and is widely used, but it is not suitable for the vibration test of large-volume objects

Method used

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  • Introduced capacitive device for measuring horizontal ground micro-vibration
  • Introduced capacitive device for measuring horizontal ground micro-vibration
  • Introduced capacitive device for measuring horizontal ground micro-vibration

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Embodiment Construction

[0022] The invention makes full use of the characteristics of structural vibration. For a small-mass column fixed vertically on the ground, when the vibration frequency of the ground is much lower than the natural frequency of the column, the vibration of the column is completely consistent with the vibration of the ground. In addition, the test device of the present invention adopts a capacitive sensor, which can simultaneously test vibrations in two vertical directions on the horizontal plane.

[0023] The working principle of the external capacitive measurement device for measuring ground trace level vibration is that the voltage output The measured displacement is converted into a voltage output through transformation, and the voltage output is proportional to the measured displacement. The vibration of the copper column fixed vertically on the ground is exactly the same as the vibration of the ground. Therefore, the change of the passing voltage is proportional to the g...

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Abstract

The invention discloses an introduced capacitive device for measuring horizontal ground micro-vibration. The device comprises a standard signal generator (11), an introduced capacitive sensor (12), a negative feedback operational amplifier (13) and a low-pass filter and display system (14). The introduced capacitive sensor comprises an introduced copper cylinder (5) and a capacitor piece (4), wherein the introduced copper cylinder (5) is arranged on the ground, and the capacitor piece (4) is arranged at the top end of the introduced copper cylinder (5). A vibration isolation ditch (8) is arranged at a 2m<2> position surrounding the periphery of the copper cylinder, a steel cylinder A (6) and a steel cylinder B (10) are arranged on the outer side of the vibration isolation ditch, a steel beam (7) is arranged at the top ends of the two steel cylinders, a measuring electrode (1), a shielding electrode (2) and a shielding electrode shell (3) are arranged below the steel beam, and an excitation source (9) is arranged within an enclosed scope of the vibration isolation ditch (8). The introduced capacitive device is simple in structure and convenient to use, facilitates simultaneous measurement of horizontal vibration in two vertical directions, and can be specially used for precisely measuring horizontal ground micro-vibration.

Description

technical field [0001] The invention relates to a horizontal vibration measuring device, in particular to an external capacitive displacement sensor and a vibration test, which is suitable for the measurement of ground trace vibrations. Background technique [0002] The discharge structure of high dams is prone to fatigue or vibration damage under the long-term discharge load, which seriously affects the normal operation and benefit of the project. Therefore, effective detection methods must be found to quickly and accurately discover hidden dangers and diseases in hydraulic structures, effectively predict their safety conditions, and evaluate their operational reliability. Therefore, how to obtain the vibration information of the structure accurately and conveniently is an important prerequisite for monitoring the operation status of hydraulic structures. The existing vibration testing means are to install displacement or acceleration sensors on the vibrating structure to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
Inventor 练继建于通顺张龑
Owner TIANJIN UNIV
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