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• RESEARCH OF ELECTROMECHANICAL TRANSDUCER’S FASTENING INFLUENCE TO THE ACCELERATION PIEZOSENSOR’S CHARACTERISTICS

  V.V. Yanchich

  2021-07-18

  Abstract ▼

  The research is carried out to obtain data necessary to improve calculation accuracy and
  for construction optimization in piezosensors of mechanical values. These sensors are widely used
  for control, monitoring and diagnostics of complex equipment and engineering structures. The
  task of the research is to study the features of working deformations in electromechanical
  piezotransducer in area of fastening to sensor base and to estimate their influence to the main
  metrological characteristics. The object of the research is electromechanical transducer in the
  form of cylindrical monolithic block made of piezoelectric ceramics with height-to-diameter ratio
  0.33 to 2. This transducer is fixed on the sensor’s base which is affected by progressive acceleration
  of vibration oscillations from the controlled object. Using the ANSYS Multiphysics softwarepackage a mathematical model of the transducer with two fundamentally different types of fastening
   “free sliding” and “rigid”  has been investigated. At the same time the mechanism of
  transverse mechanical shunting of transducer’s deformation in limit region of the rigid fastening
  was revealed. “Fastening effect coefficient” and its determination formula for various transducer’s
  height-to-diameter ratios are proposed for quantitative estimate of fastening conditions influence
  to transducer’s characteristics. Taking into account the properties of structural materials
  used in practice and the most frequently used elastic compression of elements a method was developed
  and experimental studies were carried out to determine the effect of transducer’s fastening in
  real sensor designs. It was found that base material properties and transducer dimensions ratio in
  real sensor design can cause changes in voltage conversion coefficient up to 15%, the charge
  conversion coefficient up to 22%, electric capacity up to 9% and longitudinal resonance frequency
  up to 16%. The influence of boundary fastening conditions decreases simultaneously with the increase
  of transducer’s relative height. The calculating data were obtained experimentally for the
  fastening effect coefficient when making the sensor’s base of metals with elastic modulus of
  74300 GPa and density of 270017700 kg/m3. The results of research carried out can be taken
  into account when designing piezosensors of mechanical values.