Inelastic Processes in Internal Permanent Joints of Mechanical Resonators of the Wave Solid-State Gyroscopes

Abstract

The article discusses the dissipative processes occurring in typical internal permanent (adhesive and soldered) connections of wave solid-state gyroscopes, implemented when assembling a resonator with a base and installing piezoelectric elements on its surface. Part of the resonator oscillation energy is dissipated due to volumetric and thermoelastic inelastic processes in the material of the connecting layers, which significantly worsens the characteristics of the device. This effect can be reduced by balancing the resonator, increasing the area of the connection, decreasing the thickness of the connecting layer, and selecting a layer material with low volumetric internal friction. The axial asymmetry of such a connection leads to the dependence of the insertion losses on the circumferential angle. In another type of connections, piezoelectric element-resonator, in addition to the volumetric internal friction, thermoelastic losses arising during bending vibrations should also be taken into account. Calculations show that the use of soldered connections of this type is preferable compared to adhesive ones with a layer thickness of less than ~ 20 µm. In addition, the thixotropic properties of adhesives lead to hysteresis of their inelastic properties during heating and cooling, and, accordingly, to errors in wave solid-state gyroscopes operating in a wide temperature range. The influence of the configuration of internal permanent connections and the properties of the material of the connecting layer on the dissipation of oscillation energy is analyzed

Please cite this article in English as:

Lunin B.S., Basarab M.A. Inelastic processes in internal permanent joints of mechanical resonators of the wave solid-state gyroscopes. Herald of the Bauman Moscow State Technical University, Series Instrument Engineering, 2025, no. 4 (153), pp. 30--45 (in Russ.). EDN: MADNSW

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