- 期刊
Dynamic Analysis on Feed System of Gantry Machine Tool Considering Thermal-Mechanical Coupling
考慮熱－力耦合的龍門機床進給系統動態分析
摘要
龍門機床進給系統具有行程大、受力複雜、發熱源多的特點，導致進給系統的動態性能是一個涉及到熱—力耦合的問題。為了研究熱—力耦合效應對大型龍門機床進給系統動態性能的影響規律，在熱—力耦合理論分析基礎上，提出通過有限元仿真和試驗相結合建立動態分析模型的方法。根據所提出的方法，對所研究的一種大型龍門機床進給系統分別進行熱—力耦合振動穩態分析和瞬態分析發現：在整個進給系統達到熱平衡狀態之前，進給系統的熱能不斷地增加，導致熱能轉化為機械能，進而使得進給系統的振幅變大，並且新增一階固有頻率。因此，在對龍門機床進給系統進行分析與設計的過程中，必須考慮熱—力耦合特性對振動性能的影響。
並列摘要
Gantry machine tool feed system has the characteristics of long travel, complex loads and multi-thermal sources, so the dynamic performance of the feed system is a thermal-mechanical coupling problem. In order to study the law of thermal-mechanical coupling affecting on gantry machine feed system's dynamic performance, a method for dynamic analysis modeling by combining finite element simulation and experiment was proposed based on the thermal-mechanical coupling theoretical analysis. According to the proposed method, after conducting the thermal-mechanical vibration steady-state and transient analysis on gantry machine tool feed system studied, the conclusions obtained are as follows: Before the whole feed system reaches thermal balance state, feed system's thermal energy increasing continually results in the thermal energy transforming into mechanical energy, which makes the vibration amplitude of the feed system increasing continually and makes the feed system getting a new natural frequency. Therefore, in the gantry machine tool feed system's analysis and design process, the influence of thermal-mechanical coupling on the vibration performance must be considered.