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目的研究脉动压力作用下冲压发动机燃烧室热结构振动环境预示方法。方法建立发动机结构的力学模型,同时开展相应的常温和热模态试验,对有限元模型进行对比、修正,以最终得到的力学模型为基础,分段对发动机结构施加脉动压力,完成冲压发动机脉动压力作用下热振动响应计算,并与试验结果进行对比分析。结果预示结果与试验结果基本相符,验证了所采用的冲压发动机振动响应分析方法和技术途径的可行性和正确性。结论这种热-结构分析方法可用于冲压发动机振动环境预示,同时也可用于优化发动机结构设计,对飞行器研制初期环境预示及结构设计工作具有重要的工程应用价值。
Aim To study the method of predicting the vibrational environment of the thermal structure of the ramjet engine under the action of pulsating pressure. Methods The mechanical model of the engine structure was established. At the same time, the corresponding normal temperature and thermal modal tests were carried out. The finite element model was compared and corrected. Based on the resulting mechanical model, the pulsating pressure was applied to the engine structure in stages, Under the action of pressure, the thermal vibration response is calculated and compared with the test results. The results show that the results are in good agreement with the experimental results, and the feasibility and correctness of the analysis methods and technical approaches for the vibration response of the ramjet engine are verified. Conclusion This method of heat-structure analysis can be used to predict the vibration environment of ramjet engine. It can also be used to optimize the design of engine structure. It has important engineering application value for the early environmental prediction and structural design of aircraft.