Digital fatigue sensor
A sensor and fatigue technology, applied in electromagnetic measurement devices, electric/magnetic solid deformation measurement, etc., can solve the problems of large environmental interference, poor monitoring effect, and high response threshold value
Inactive Publication Date: 2016-05-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
Poor monitoring due to inherent flaws in these monitoring technologies
The digital fatigue sensor of the present invention can be installed on the structure for a long time to carry out effective fatigue monitoring, but the factors such as long signal transmission of large and complex structures, large environmental interference, and high response threshold value greatly reduce the test accuracy
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[0016] The present invention will be further described below in conjunction with the accompanying drawings.
[0017] The structure of the present invention is as figure 1 As shown, it includes a fatigue meter 1.1, a multiplier 1.2, an acquisition card 1.3, and a horizontal support arm 2.1, a bow body 2.2, a mounting foot 2.3, and a rubber elastic body 2.4 constituting the multiplier 1.2.
[0018] The bow-shaped strain multiplier 1.2 is formed by wire-cutting the thicker horizontal support arm 2.1 and the middle part of the thinner bow-shaped body 2.2. The deformation is mainly caused by the bending deformation of the middle part of the bow-shaped body 2.2, and the displacement at both ends is concentrated at the bow-shaped opening. , there are two mounting feet 2.3 at one end of the horizontal support arm 2.1 on both sides; the bow-shaped opening is filled with vinyl rubber, that is, the elastic body 2.4, and two fatigue gauges 1.1 are pasted on the elastic body 2.4, which are...
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The invention discloses a digital fatigue sensor. The digital fatigue sensor comprises fatigue meters, multipliers, and acquisition cards, the fatigue meters are made of foil-shaped constantan materials for forming a microscopic Ni atom assembling body, four fatigue meters are pasted at the bottoms of the multipliers, the multipliers are arc pre-stress structures, the multiplier comprises an arc elastic structure and an elastomer connected with an arc opening, the dimension of the elastomer is a little smaller than the dimension of the arc opening, the multiplier is in a pre-compression state under the effect of a restoring force of the arc opening and the elastomer, and the acquisition cards are directly arranged on horizontal supporting seats of the multipliers and can acquire resistance change signals of the fatigue meters of two channels. According to the digital fatigue sensor, the mechanical structure is simple, the size is small, the anti-interference ability is high, the converting precision is high, the temperature and non-linear influence can be eliminated, long-distance measuring transmission can be performed, and the composition of a test network is easy.
Description
technical field [0001] The invention relates to the field of health monitoring, in particular to a digital fatigue sensor. Background technique [0002] With the softening of large-scale structural design and the increasing complexity of structural form and function, its durability has attracted increasing attention. For example, long-span bridges work in a very complex environment for a long time. Due to the role of many unknown and complex factors in the structure and environment, it is very important to grasp the bearing capacity and durability of the bridge structure during operation. my country's current bridge design codes lack detailed regulations on the fatigue problems of such bridges, and the design of steel or steel-concrete composite girder cable-stayed bridges and suspension bridges often ignores the consideration of fatigue problems. Therefore, the current bridge fatigue monitoring system plays an important role. The method of large-scale bridge damage monito...
Claims
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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 李训涛胡明敏张明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS