基于热分析的二齿差摆杆活齿传动中心轮模态研究

为了研究温度对二齿差摆杆活齿传动结构模态的影响，首先对二齿差摆杆活齿传动中心轮进行了温度场和热应力分析，然后在二齿差摆杆活齿传动热-结构耦合分析的基础上对中心轮进行了模态分析，将不同工作状态下的模态分析结果进行比较，分析温度场对摆杆活齿传动中心轮模态的影响。结果表明：由温度变化所引起的材料力学性能变化对各阶固有频率影响的程度不同，由热应力引起的固有频率变化小于由材料力学性能变化引起的固有频率变化。分析结果符合实际工况，为二齿差摆杆活齿传动的振动可靠性设计及动态特性研究提供了理论依据。

Modal Study of Two-tooth Difference Swing-rod Movable Teeth Transmission Based on Thermal Analysis

To study the influence of temperature on the modes of two-tooth difference swing-rod movable teeth transmission structure, the temperature field and the thermal stress of the central wheel of the transmission were analyzed.On the basis of thermal structure coupling analysis of two-tooth difference swing-rod movable teeth transmission, modal analysis of the cental wheel was carried out. The results of modal analysis under different working conditions were compared, and the influence of temperature field on the modes of the central wheel of the transmission was investigated. The results showed that the natural frequencies of the central wheel are influenced in different degrees by the change of mechanical properties of the materials caused by temperature change, and that the natural frequency variation caused by thermal stress is less than that caused by changes in mechanical properties of materials. The analysis results are in accord with the actual working conditions,provide a theoretical basis for vibration reliability design and dynamic characteristics´research of two-tooth difference swing-rod movable teeth transmission.