Dynamic Pressure Analysis of Liquid Circular Angular Accelerometer: Fluid Type and Temperature Dependence

This paper concerns the problem of the dynamic pressure analysis of liquid circular angular accelerometers (LCAAs) with different fluids inside and at different temperatures on the basis of the transient flow model. Theoretically, the models of temperature dependence on density and wave speed of different fluids are presented via parameters analysis in the transient flow model. Furthermore, the influence of gas content in the fluids of LCAAs is also taken into account, in order to enhance the performance of LCAAs under adverse conditions of practical applications. Simulation experiments were carried out, and thus the frequency-response curve and the temperature dependence of low-frequency gain as well as the natural frequency of LCAAs were obtained, when pure water, acetone, methanol and mercury were selected as working fluids in LCAAs. What’s more, the gas content influence on the density and wave speed was also simulated to determine its effects on dynamic pressure process. Consequently, this study does provide us with theoretically adequate models and indication for temperature compensation module design, working fluid selection and gas content limitation of LCAAs.