湿式离合器物理场测量系统设计
发布时间：2018-07-18 11:39
【摘要】：湿式离合器的温度场与热应力场的检测一直是改进离合器摩擦片结构的关键点之一。目前,解决测温系统的响应速度以及温度测点的布置方案是研究的重点问题。基于国内外近些年对摩擦表面物理场的理论研究,本文针对这些重点问题进行了深入探讨,提出了一种能够实时、准确地得到湿式离合器摩擦表面温度场与热应力场测量系统的设计方法。根据对离合器实际运行工况下的摩擦表面温度场与热应力场进行有限元仿真,对温度传感器布阵方式进行了研究,为测量系统的设计提出了依据。分析了物理场分布特征,得到离合器运行过程中高温热点的位置与产生热应力较大处的位置,设计了能够以较少的测点描述整个摩擦表面温度场分布的布阵方案。基于测量系统要求的快速测温原则,选择了合适的热电偶和放大器芯片,设计了无线供电方式对离合器内系统供电,并以电路屏蔽技术和外部屏蔽技术两方面相结合的方式处理外部干扰。研究了最小二乘拟合法剔除野值和小波分析滤波的程序进行信号处理。利用热电偶的动静态标定验证测温系统的准确性和实时性。最后通过模拟真实情况的台架试验检验本文所设计测量系统的有效性。
[Abstract]:The detection of temperature field and thermal stress field of wet clutch is one of the key points to improve the structure of clutch friction disc. At present, it is an important problem to solve the response speed of temperature measurement system and the layout of temperature measuring points. Based on the theoretical research on the physical field of friction surface at home and abroad in recent years, this paper makes a thorough discussion on these important problems, and proposes a new method which can be used in real time. The design method of measuring system of temperature field and thermal stress field on friction surface of wet clutch is obtained. According to the finite element simulation of temperature field and thermal stress field of friction surface under the actual operating condition of clutch, the layout of temperature sensor is studied, which provides the basis for the design of measuring system. The distribution characteristics of physical field are analyzed and the position of hot spot at high temperature and the position where the thermal stress is larger are obtained during the clutch operation. The array scheme which can describe the temperature field distribution of the whole friction surface with fewer measuring points is designed. Based on the principle of rapid temperature measurement required by the measurement system, the suitable thermocouple and amplifier chip are selected, and the wireless power supply mode is designed to supply power to the clutch inner system. The external interference is dealt with by the combination of circuit shielding technology and external shielding technology. The program of eliminating outliers and wavelet analysis filter by least square fitting method is studied for signal processing. The accuracy and real-time of the temperature measurement system are verified by the dynamic and static calibration of the thermocouple. Finally, the validity of the measurement system designed in this paper is verified by simulating the real situation.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.4
本文编号：2131788
[Abstract]:The detection of temperature field and thermal stress field of wet clutch is one of the key points to improve the structure of clutch friction disc. At present, it is an important problem to solve the response speed of temperature measurement system and the layout of temperature measuring points. Based on the theoretical research on the physical field of friction surface at home and abroad in recent years, this paper makes a thorough discussion on these important problems, and proposes a new method which can be used in real time. The design method of measuring system of temperature field and thermal stress field on friction surface of wet clutch is obtained. According to the finite element simulation of temperature field and thermal stress field of friction surface under the actual operating condition of clutch, the layout of temperature sensor is studied, which provides the basis for the design of measuring system. The distribution characteristics of physical field are analyzed and the position of hot spot at high temperature and the position where the thermal stress is larger are obtained during the clutch operation. The array scheme which can describe the temperature field distribution of the whole friction surface with fewer measuring points is designed. Based on the principle of rapid temperature measurement required by the measurement system, the suitable thermocouple and amplifier chip are selected, and the wireless power supply mode is designed to supply power to the clutch inner system. The external interference is dealt with by the combination of circuit shielding technology and external shielding technology. The program of eliminating outliers and wavelet analysis filter by least square fitting method is studied for signal processing. The accuracy and real-time of the temperature measurement system are verified by the dynamic and static calibration of the thermocouple. Finally, the validity of the measurement system designed in this paper is verified by simulating the real situation.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.4
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