Calculations of flexibility module in measurements instruments

5th ModTech International Conference - Modern Technologies in Industrial Engineering

Wróbel, A.^1 ; Placzek, M.^1 ; Baier, A.^1

Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18a Street, Gliwice

44-100, Poland^1

关键词: Direct piezoelectric effects;    Electrical parameter;    Material deformation;    Measurements instruments;    Mechanical elements;    Number of components;    Piezoelectric sensors;    Potential difference;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/227/1/012137/pdf
DOI  :  10.1088/1757-899X/227/1/012137

来源: IOP

【 摘 要 】

Piezoelectricity has found a lot of applications since it were discovered in 1880 by Pierre and Jacques Curie. There are many applications of the direct piezoelectric effect - the production of an electric potential when stress is applied to the piezoelectric material, as well as the reverse piezoelectric effect - the production of strain when an electric field is applied. This work presents a mathematical model of a new model of vibration sensor. The principle of operation of currently used sensors is based on the idea: changes in thickness of the piezoelectric plates cause the vibration of the mechanical element, so-called "fork". If the "forks" are not buried by the material deformation of the full tiles broadcasting is transmitted to receiver piezoelectric plate. As a result of vibration of receiver plates the cladding is formed on the potential difference proportional to the force. The value of this voltage is processed by an electronic circuit. In the case of backfilling "forks" the electric signal is lower. At the same time is not generated the potential for cladding tiles. Such construction have a lot of drawbacks, for example: need to use several piezoelectric plates, with the increase in number of components is increased failure of sensors, sensors have now produced two forks resonance, using these sensors in moist materials is often the case that the material remains between the forks and at the same time causes a measurement error. Mentioned disadvantages do not appear in the new proposed sensor design. The Galerkin method of the analysis of considered systems will be presented started from development of the mathematical model, to determine the graphs of flexibility and confirm two methods: exact and approximate. Analyzed beam is a part of the vibration level sensor and the results will be used to identify the electrical parameters of the generator. Designing of technical systems containing piezoelectric transducers is a complex process, due to the phenomena occurring in them. A correct description of the given device in the form of a mathematical model, already in its design phase, is a fundamental condition for its proper functioning. The presented analyzes may be used in the study of any mechanism by piezoelectric sensor, including for the steering column examination.