旋转式能量回收装置转速测量方法研究  

Speed measurement method of rotary energy recovery device

作　　者：袁任江 叶天壮 曲云飞 胡鑫超 焦磊[1,2] YUAN Renjiang;YE Tianzhuang;QU Yunfei;HU Xinchao;JIAO Lei(Ocean College,Zhejiang University,Zhoushan 316000,China;Donghai Laboratory,Zhoushan 316000,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316000 [2]东海实验室,浙江舟山316000

出　　处：《机电工程》2023年第9期1336-1344,共9页Journal of Mechanical & Electrical Engineering

基　　金：国家重点研发计划项目(2017YFC0403800)。

摘　　要：海水淡化旋转式能量回收装置的转子转速最能直接体现装置的运转状态,但转子被外筒体完全包裹,转子转速无法直接测量。为此,对旋转式能量回收装置振动频率与转子转频进行了分析,提出了一种基于振动信号的旋转式能量回收装置转子转速测量方法。首先,通过实验采集了不同流量下装置的振动和转速数据,并且对装置振动频率与转子转频进行了分析,发现了装置振动主要频率与转子8倍转频有良好的对应关系,建立了振动主频与转子转频的关系式;然后,在此基础上研究了从振动信号中获取转频信息的信号处理与转频计算方法,包括使用小波变换消除振动信号中的基线漂移,利用包络法进行了信号解调以凸显转频信息,为了准确地计算旋转式能量回收装置转子的转速,通过振动能量估计了转频的范围;最后,为了对该转速测量方法的准确性进行验证,在实验平台上对其进行了实验。研究结果表明:在装置平稳运转状态下,该方法测量转速最大误差率为2.55%,在非平稳运转状态下的最大误差率为4.58%,能够满足在线、准确地测量旋转式能量回收装置转子转速的要求。The rotary energy recovery device(RERD)was used in the seawater desalination process.The rotational speed of the rotor can directly reflect the operative state of the RERD.The rotor was entirely covered by the outer shell.Therefore,the rotational speed of the rotor was difficult to measure directly.To solve the problem,the vibration frequency and rotor rotation frequency of rotary energy recovery device were analyzed,and a method for measuring rotor speed of rotary energy recovery device based on vibration signal was proposed.Firstly,the vibration data and the rotational speed data at different flow rates were collected by experiments.It was found that the main vibration frequency corresponded well to the 8 times rotational frequency by analyzing the vibration frequency of the device and the rotational frequency of the rotor.The relationship between the main frequency and the rotational frequency was established.Then,the method of processing signals and calculating the rotational frequency was studied to obtain the rotational frequency information from vibration signals,including eliminating baseline drift by wavelet transform,demodulating vibration signals to reflect the rotational frequency better;in order to accurately calculate the rotor speed,the frequency conversion range was estimated through vibration energy.Finally,the accuracy of the speed measurement method was verified on the experimental platform.The results show that the maximum error rate of rotational speed is 2.55%under the steady state and the maximum error rate is 4.58%under an unsteady state.It can meet the requirements of online and accurate measurement of the RERD rotational speed.

关 键 词：旋转式能量回收装置 转子转速测量方法 振动信号 基线漂移 信号包络解调 振动主频 转子转频 

分 类 号：TH133[机械工程—机械制造及自动化] P747[天文地球—海洋科学]