高频正弦压力发生装置的非理想因素影响分析
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摘要
高频正弦压力发生装置通过安装在底端的压电换能器作为激励源,谐振腔将会对谐振点分布和幅值产生影响。在实际装置安装的过程中,会因工程因素而造成一定的非理想性,其中包括管腔连接位置处的安装缝隙,管腔内的水介质未完全充满管腔,存在空气夹层,以及压电换能装置表面不平齐等。通过COMSOL仿真平台,以多物理场耦合仿真的方式,分析了压固耦合情况下谐振频率与理论计算的误差,同时针对以上的非理想性因素进行仿真研究,结果表明安装缝隙将会导致压力幅值降低,当管腔内部存在空气缝隙时,会造成谐振点幅值下降,对低频影响严重。同时压电换能器在安装过程中表面不平整时,将导致谐振频率偏移,且倾斜角度越大,偏移程度越严重。最后通过与实验数据相对比,对仿真结果进行验证,规律基本一致。
A piezoelectric transducer installed at bottom of a high frequency sine pressure generator was taken as the generator's excitation source, and its resonant cavity affects distributions of resonant points and pressure amplitude. During the actual installation, there are some non-ideal factors due to engineering reasons including gaps at tube cavity connection positions, water medium not enough to fill tube cavity, air layer and uneven surface of piezoelectric transducer. Based on the software COMSOL simulation platform, taking the form of multi-physical field coupled simulation, the error between resonant frequency under the case of acoustic-structure coupling and theoretical calculation was analyzed, and simulation studies were conducted for non-ideal factors mentioned above. The simulation results showed that installation gaps cause pressure amplitude to drop, and air gaps in tube cavity causes resonant points' amplitudes to drop and affects low-frequency amplitude seriously; uneven surface of piezoelectric transducer in installation process causes resonant frequency to offset, the larger the inclination angle, the more serious the offset; comparing the simulation results with the test ones, both of them have basically consistent laws..
A piezoelectric transducer installed at bottom of a high frequency sine pressure generator was taken as the generator's excitation source, and its resonant cavity affects distributions of resonant points and pressure amplitude. During the actual installation, there are some non-ideal factors due to engineering reasons including gaps at tube cavity connection positions, water medium not enough to fill tube cavity, air layer and uneven surface of piezoelectric transducer. Based on the software COMSOL simulation platform, taking the form of multi-physical field coupled simulation, the error between resonant frequency under the case of acoustic-structure coupling and theoretical calculation was analyzed, and simulation studies were conducted for non-ideal factors mentioned above. The simulation results showed that installation gaps cause pressure amplitude to drop, and air gaps in tube cavity causes resonant points' amplitudes to drop and affects low-frequency amplitude seriously; uneven surface of piezoelectric transducer in installation process causes resonant frequency to offset, the larger the inclination angle, the more serious the offset; comparing the simulation results with the test ones, both of them have basically consistent laws..
引文
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[3] 李龙飞,陈建华,洪流,等.高频燃烧不稳定性的试验研究方法及面临的挑战[J].火箭推进,2009,35(2):7-11.LI Longfei,CHEN Jianhua,HONG Liu,et al.Experimental research methods and challenges of high frequency combustion instability[J].Journal of Rocket Propulsion,2009,35(2):7-11.
[4] 张远平,池家春,龚晏青,等.爆炸冲击波压力测试技术及其复杂信号的处理方法[C].第十四届高压学术会议,2007:324-327.
[5] LOKAR T,SMRECNIK A,BAJSIC I.Generating dynamic pressure with loudspeakers[C].XVI IMEKO World Congress.Vienna,AUSTRIA,2000:25-28.
[6] KUTIN J,BAJSIC I.Characteristics of a dynamic pressure generator based on loudspeakers[J].Sensors and Actuators A:Physical,2011(168):149-154.
[7] SVETE A,?TEFE M,MA,et al.Development of a measurement system for dynamic calibration of pressure sensors[C].XXI IMEKO World Congress.Measurement in Research and Industry.August 30 September 4,2015,Prague,Czech Republic
[8] SVETE A,?TEFE M,MA,et al.Dynamic pressure generator for dynamic calibrations at different average pressures based on a double-acting pneumatic actuator[J].Sensors and Actuators A:Physical,2016(247):136-143.
[9] 陶继增,李程,李欣.一种新型正弦压力发生器[J].计测技术,2008,28(3):24-25.TAO Jizeng,LI Cheng,LI Xin.A new type of sine pressure generator[J].Metrology & Measurement Technology,2008,28(3):24-25.
[10] 杨凡,孔德仁,孔霖,等.基于BP神经网络的冲击波压力传感器组件动态特性分段建模方法研究[J].振动与冲击,2017,36(16):155-158.YANG Fan,KONG Deren,KONG Lin,et al.A segment modeling method for the dynamic characteristics of shock wave pressure sensor assembly based on BP neural network[J].Journal of Vibration and Shock,2017,36(16):155-158.
[11] SALYI D,BOLDOR D,AITA G M,et al.COMSOL Multiphysics model for continuous flow microware heating of liquids[J].Journal of Food Engineering,2011(104):422-429.
[12] 苏尔皇.管道动态分析及液流数值计算方法[M].哈尔滨:哈尔滨工业大学出版社,1983:65-74.
[13] Zimmerman W.B.J.中仿科技公司.COMSOL Multiphysics 有限元多物理场建模与分析[M].北京:人民交通出版社,2007.