Self-driven displacement sensor based on friction nano-generator

Abstract

The invention provides a self-driven displacement sensor based on a friction nano-generator. The displacement sensor comprises a cylindrical inner column and a cylinder with a cylindrical cavity. Oneend of the inner column is fixedly connected to a component to be measured, the other end of the inner column is inserted into the cavity of the cylinder. The inner column generates axial relative displacement with cylinder along with displacement of a to-be-measured component, and the inner dielectric material layer and the outer dielectric material layer rub each other to generate an electric signal. Compared with other strain measurement devices, the self-driven displacement sensor based on the friction nano-generator has the advantages of simple structure, wide application range, high measurement precision, no need of additional power supply, low cost and the like. Meanwhile, the self-driven displacement sensor has the characteristics of low cost, high precision, wide application range, easy processing, simplicity and convenience in operation and the like.

Description

technical field [0001] The invention relates to a self-powered sensor device for structural dynamic displacement monitoring, in particular to a self-driven displacement sensor based on a friction nanogenerator. Background technique [0002] Under the action of external loads such as wind load, earthquake load and traffic load, civil engineering structures will produce vibration and displacement, exceeding a certain limit will affect the normal use of the structure, and even cause structural damage, so it is necessary to strengthen the structure of the building Vibration displacement monitoring to ensure its safety and feasibility. Most of the current displacement monitoring is done by strain testing. The structural strain testing is a very important link for engineers to optimize the design of the structure, understand the stress state of the structure and ensure the safety of the structure. In today's civil engineering industry, strain measuring instruments are widely used...

AI Technical Summary

Problems solved by technology

Among them, if the dial gauge strain gauge is used, due to the length of the label and the limitation of installation, it is limited in practical application; if the resistance strain gauge is used, it has nonlinearity, weak output signal, poor anti-interference ability, and is affected by the environment. Larger, and it can only measure the strain of a point on the surface of the component along a certain direction and cannot perform global measurement; if a vibrating wire sensor is used, the requirements for sensor materials and processing technology are high, and the measurement accuracy is low

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