振动式料位计固有频率分析及测试方法  

Research on Vibration Rod Level Sensor's Natural Frequency Analysis and Test Method

作　　者：曹恒[1] 宫文斌[1] 李美雄[2] 邱伟[1] 吴昊[1] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]上海氯碱化工股份有限公司,上海200241

出　　处：《仪表技术与传感器》2009年第9期89-90,94,共3页Instrument Technique and Sensor

摘　　要：为了实现振动式料位计材料的更换,对料位计物理结构以及工作原理进行了研究,提出一种可靠有效的测试方法。材料的改变引起结构固有频率的变化,通过ANSYS软件进行有限元分析得出系统固有频率。在此基础上,利用波形发生器,发出PWM波对压电陶瓷进行激励,调整PWM波频率与电压,直至棒体振动。经实验证明,此方法得到的系统频率与实际频率十分接近,可用于指导料位计的设计工作并缩减调试过程。In order to change the material of the vibration rod level sensor, this paper researched on the physical structure and work principle of level sensor, presented a kind of reliable and valid of test method. The change of material caused the variety of the structure natural frequency. Using finite element analysis software ANSYS, the structure natural frequency could be a- chieved. Based on the frequency, PWM wave was sent out to encourage the PZT by waveform generator, adjusted PWM wave fre- quency and voltage until the rod＇s vibration. Proved by experiment, the system frequency got by this method is very close to the ac- tual one and can be used for instruction to the design of the level sensor, decrease the process of the test.

关 键 词：料位计 固有频率 有限元分析 振动 

分 类 号：TH816[机械工程—仪器科学与技术]