Research On Vortex Anti-vibration Performance Based On Triaxial Accelerometers

Vortex flowmeter is a kind of instrument which achieves the measurement based on the principle of fluid vibrating.Because of its simple structure,easy maintenance,and many other advantages,it had already plays an important role in the fields of petroleum,chemical,power and other industries,but defects are also exposed as its widespread application.It's very sensitive to external vibration disturbance and has poor vibration resistance.This paper continued the research on vortex acceleration measurements,presented and further optimized the vortex measurement program based on triaxial accelerometer.Firstly,the principle of vortex flowmeter and research on seismic work were briefly summarized and compared.Then this paper reviewed the results of previous studies of the subject,presented the idea that further broaden the operating band by optimizing the cantilever probe parameters,following research were carried out on basis of this idea:1)Theory and real model of vortex probe are established to complete the theoretical derivation of the cantilever structure's natural frequencies and mode shapes.Then this paper listed and analyzed the material and structural parameters which had impact on natural frequency(first-order modal frequency),proposed the idea of continuing the structural optimization by changing total length L and the value of L1: L2,making it more suitable for acceleration measurement;2)Using ANSYS finite element analysis software to do the modal analysis on probe models with different L and L1: L2,changes of the first-order modal frequency(natural frequency)are attached importance to.Then this paper analyzed how the value of L and L1: L2 affect the natural frequency respectively.Without consideration on displacement of the end of probe,we gave preliminary optimization programs for probe structure of DN50(L=40mm);3)In order to achieve a more realistic simulation of small load vortex flow conditions,this paper calculated the dynamic pressure values on both sides of the probe by fluid simulation,then applied it at the end of the probe as a pressure load.Using full solution method to do the harmonic response analysis on probe modes with different L and L1: L2.At last,we presented the final optimization program of DN50 probe structure based on simulation results and research data above;4)According to the simulation results,structure parameters of the acceleration vortex probe were improved.The overall design was completed by installing the acceleration acquisition module at the end of the probe with potting;The experiments were completed on the gas pipeline vibration device in Tianjin University,the design achieved the expected results.