基于智能移动终端的全频动平衡测试系统研究与开发
发布时间：2018-07-14 15:44
【摘要】：整机动平衡是旋转机械振动控制的关键技术,目前,工业上都是孤立地利用单向振动信息去实施整机动平衡,但是对于刚度各向差异显著的转子系统,单次平衡精度不高和平衡效率低下。此外,基于上述方法的动平衡仪器常见是以单片机为核心的手持式设备或者是以PC机为核心,单片机为下位机的现场测试系统。前者数据处理能力弱,交互能力差,后者虽然具有数字化和人性化的特点,但是成本高,续航能力弱,携带不方便,上下位机间需用专用线缆通信,现场布线麻烦。针对以上缺点,本文在深入研究全频整机动平衡方法基础上,从硬件框架,通讯协议和软件实现等方面详细讨论了基于智能手机的全频整机动平衡测试系统的设计与开发,取得了以下成果：1.提出了全频整机动平衡方法。首先拾取转子系统的基准信号和水平,竖直方向的振动信号,用整周期互相关方法识别出工频振动信号的幅值和相位,结合FFT和全息技术进行工频故障确诊,提高不平衡确诊率。再将工频椭圆分解成正进动振动和反进动振动,用模拟和实验验证了正进动振动的初矢径能够代表刚度各向异性转子的不平衡振动响应,研究证明可以基于正进动的初矢径用影响系数法去识别出转子不平衡量。2.提出了一种基于智能移动终端的全频整机动平衡测试系统方案。该系统采用主从结构,移动终端主要用于人机交互,振动监测,故障诊断,不平衡解算和数据存储,下位机是单片机,控制信号采集,上下位机通过RFCOMM数据格式的进行数据通信。3.设计了上下位机之间的通信协议,完成了整个动平衡测试系统的软件实现。用软件实现了两者之间的蓝牙RFCOMM信道的连接和可靠通信,实现了手机上实时振动监测、振动分析、不平衡解算和数据储存。4.用开发仪器对4-72型离心式风机进行了动平衡实验,获得了良好的效果,实验结果表明,全频动平衡方法比传统影响系数法单次平衡精度更高,平衡效果更显著,验证了全频动平衡方法和研制仪器的可靠性和实用性。
[Abstract]:Dynamic balancing is the key technology in vibration control of rotating machinery. At present, the unidirectional vibration information is used in industry to implement the dynamic balance of the whole machine, but for rotor systems with different stiffness in different directions, The single balancing accuracy is not high and the balance efficiency is low. In addition, the dynamic balancing instrument based on the above method is usually a hand-held device with single-chip microcomputer as the core or a field test system with PC as the core and single-chip computer as the lower computer. Although the former has the characteristics of digitalization and humanization, the latter has the characteristics of high cost, weak endurance, inconvenient carrying, special cable communication between the upper and lower computers, and trouble of wiring in the field. In view of the above shortcomings, this paper discusses the design and development of the full frequency dynamic balance test system based on smart phone in detail from the aspects of hardware framework, communication protocol and software implementation, on the basis of in-depth research on the dynamic balancing method of full-frequency whole machine. The following results have been achieved: 1. The dynamic balancing method of full frequency whole machine is put forward. Firstly, the reference signal and horizontal signal of rotor system are picked up, the vibration signal in vertical direction is picked up, the amplitude and phase of vibration signal of power frequency are identified by the method of whole period cross-correlation, and the power frequency fault is diagnosed with FFT and holography. Improve the diagnosis rate of imbalance. Then the power frequency ellipse is decomposed into positive precession vibration and reverse precession vibration. It is verified by simulation and experiment that the initial vector diameter of positive precession vibration can represent the unbalanced vibration response of the rotor with anisotropic stiffness. It is proved that the rotor unbalance. 2. 2 can be identified by the influence coefficient method based on the forward precession initial vector diameter. In this paper, a scheme of dynamic balance testing system for full frequency whole machine based on intelligent mobile terminal is presented. The system adopts master-slave structure, mobile terminal is mainly used for man-machine interaction, vibration monitoring, fault diagnosis, unbalanced solution and data storage. Upper and lower computer through RFCOMM data format for data communication. 3. The communication protocol between upper and lower computers is designed, and the software implementation of the whole dynamic balance test system is completed. The connection and reliable communication of Bluetooth RFCOMM channel between them are realized by software. The real-time vibration monitoring, vibration analysis, unbalanced solution and data storage on mobile phone are realized. The dynamic balance experiment of 4-72 centrifugal fan is carried out with the development instrument. The experimental results show that the full frequency dynamic balancing method is more accurate than the traditional influence coefficient method, and the balance effect is more remarkable than that of the traditional influence coefficient method. The reliability and practicability of the full frequency dynamic balance method and the instrument are verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH877
[Abstract]:Dynamic balancing is the key technology in vibration control of rotating machinery. At present, the unidirectional vibration information is used in industry to implement the dynamic balance of the whole machine, but for rotor systems with different stiffness in different directions, The single balancing accuracy is not high and the balance efficiency is low. In addition, the dynamic balancing instrument based on the above method is usually a hand-held device with single-chip microcomputer as the core or a field test system with PC as the core and single-chip computer as the lower computer. Although the former has the characteristics of digitalization and humanization, the latter has the characteristics of high cost, weak endurance, inconvenient carrying, special cable communication between the upper and lower computers, and trouble of wiring in the field. In view of the above shortcomings, this paper discusses the design and development of the full frequency dynamic balance test system based on smart phone in detail from the aspects of hardware framework, communication protocol and software implementation, on the basis of in-depth research on the dynamic balancing method of full-frequency whole machine. The following results have been achieved: 1. The dynamic balancing method of full frequency whole machine is put forward. Firstly, the reference signal and horizontal signal of rotor system are picked up, the vibration signal in vertical direction is picked up, the amplitude and phase of vibration signal of power frequency are identified by the method of whole period cross-correlation, and the power frequency fault is diagnosed with FFT and holography. Improve the diagnosis rate of imbalance. Then the power frequency ellipse is decomposed into positive precession vibration and reverse precession vibration. It is verified by simulation and experiment that the initial vector diameter of positive precession vibration can represent the unbalanced vibration response of the rotor with anisotropic stiffness. It is proved that the rotor unbalance. 2. 2 can be identified by the influence coefficient method based on the forward precession initial vector diameter. In this paper, a scheme of dynamic balance testing system for full frequency whole machine based on intelligent mobile terminal is presented. The system adopts master-slave structure, mobile terminal is mainly used for man-machine interaction, vibration monitoring, fault diagnosis, unbalanced solution and data storage. Upper and lower computer through RFCOMM data format for data communication. 3. The communication protocol between upper and lower computers is designed, and the software implementation of the whole dynamic balance test system is completed. The connection and reliable communication of Bluetooth RFCOMM channel between them are realized by software. The real-time vibration monitoring, vibration analysis, unbalanced solution and data storage on mobile phone are realized. The dynamic balance experiment of 4-72 centrifugal fan is carried out with the development instrument. The experimental results show that the full frequency dynamic balancing method is more accurate than the traditional influence coefficient method, and the balance effect is more remarkable than that of the traditional influence coefficient method. The reliability and practicability of the full frequency dynamic balance method and the instrument are verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH877
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