Calculated-experimental study frequency response strain transducer

Abstract

The strain transducer is used in the pressure sensors for converting the force (pressure)
into an electrical signal. In order to analyze the possibility of using a strain transducer for
definition of loading rail vehicles from the effects of irregularities by the roadway in the article found its frequency response. Experimentally identified by the first two natural frequencies of flexural vibrations strain transducer and determine the decrement at these frequencies.
The diameter of the lever is 4,5 mm, and the mass of 5 g, so the contact methods for
measuring the amplitude and frequency of oscillations are not applicable. Therefore frequency response of the strain transducer is determined experimentally using a strain gauge circuit of the strain transducer and using a single-point three-dimensional laser vibrometer Polytec 3D LV. Laser vibrometer measures three components of linear vibration velocity at the point of the oscillating object. Excitation was performed with the use of an electrodynamic shaker LDS V650 and control system LMS Scadas Lab.
Two strain transducers tested. Tests were carried out method a smooth change of frequency
sinusoidal oscillations. The two first resonant frequencies of the oscillations determined strain transducer. Resonance method defined damping coefficient. Found allowable level vibratory loads at resonance, the excess of which will result in damage to the strain
transducer.
Using finite element model the dependence of the first natural frequency of strain transducer bending stiffness of the system. This dependence makes it possible to predict the natural frequency of strain transducer according to the passport provided in each product.
Experimentally determined resonant frequency and decrement it possible to construct
computational model of the strain transducer, a verified test results. The model can be used
early in the design of pressure sensors and sensors measure the loading rail vehicles from the effects of irregularities by the roadway in the article found its frequency response.