|
|
论文:2016,Vol:34,Issue(6):982-989 |
|
|
引用本文： |
|
|
杜大华, 贺尔铭, 薛杰, 孙百红. 大推力液体火箭发动机启动冲击响应特性研究[J]. 西北工业大学学报 |
|
|
Du Dahua, He Erming, Xue Jie, Sun Baihong. Research on Start-up Impact Response Characteristics of Large Thrust Liquid Rocket Engine[J]. Northwestern polytechnical university |
|
|
|
|
|
|
|
| 大推力液体火箭发动机启动冲击响应特性研究 |
|
| 杜大华1,2, 贺尔铭1, 薛杰2, 孙百红2 |
|
1. 西北工业大学 航空学院, 陕西 西安 710072;
2. 西安航天动力研究所, 陕西 西安 710100 |
| 摘要: |
| 大推力液体火箭发动机结构对启动冲击环境的适应性对于发动机自身及火箭的可靠性与安全性均有重大影响。提出了精细化、系统性的发动机三维动力学建模技术，建立了组/部件及整机模型，采用元素型模型修正方法和模态测试数据对数学模型进行修正，获得准确的发动机结构动力学模型；基于冲击动力学理论，提出了研究发动机启动冲击力学环境效应的非线性瞬态动力学分析方法，仿真研究了结构对瞬态、强载荷冲击激励的动力响应规律。研究结果表明，预示前四阶模态与试验结果的一致性较好，模型的准确性满足冲击动力学分析要求；振动监测点的响应预测数据与试验测量值基本吻合，验证了启动冲击作用下结构瞬变过程分析方法的有效性；发动机的动态位移满足结构总体干涉和运动包络要求，掌握了发动机结构的薄弱环节在发动机氧化剂入口管的固定支板处，通过抗冲击结构改进设计成功地解决了该问题，提高了发动机结构的抗冲击能力和可靠性；文中的建模技术及冲击动力学分析方法为发动机结构精准动力学预示及试验提供了技术途径。 |
| 关键词:
液体火箭发动机
动力学建模
启动
冲击
瞬态响应分析
|
|
| Research on Start-up Impact Response Characteristics of Large Thrust Liquid Rocket Engine |
|
| Du Dahua1,2, He Erming1, Xue Jie2, Sun Baihong2 |
|
1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China |
| Abstract: |
| The adaptability of large thrust liquid rocket engine (LRE) to start-up impact environment has great influences on the reliability and safety of engine as well as rocket. Refined, systemic 3-D dynamics modeling techniques are developed for large thrust LRE. The component and whole models of engine are established, the numerical model is modified using the element-type model updating method in combine with the modal test data, so that dynamics model of engine structure can be accurately built up. Based on the theory of shock dynamics, the analytical method of nonlinear transient dynamics was proposed, which is applied to investigate the effects of start-up impact dynamics environment on the engine. The dynamic response of the engine structure under transient, strong shock excitation has also been studied in this paper. The results show that the predicted first four modes are in good agreement with experimental data, suggesting that the accuracy of the model can meet the requirement of impact dynamics analysis. The validity of the current analytical method is examined by comparing the calculated response data with experimental results at the vibration monitoring point. It is shown that the proposed analytical method performs well and also indicated that the dynamic displacement can meet the demand of structural interference and motion envelope. Otherwise, the weakest joint strength of the engine structure is located at the supporting plate of oxidant inlet pipeline, which can be improved by changing the shock resistance design of the structure. The modeling technique and impact dynamics analytical method of this research provide a technical approach for accurately predicting and testing the dynamics characteristics of the large thrust LRE. |
| Key words:
liquid rocket engine
dynamics modeling
start-up
impact
design of experiments
structural dynamics
transient analysis
|
|
| 收稿日期: 2016-05-16
修回日期:
|
| DOI: |
| 基金项目: 国家自然科学基金（51675426）、航天科技创新基金（2014KC010043）资助。 |
| 通讯作者:
Email： |
| 作者简介: 杜大华(1977-),西北工业大学博士研究生,西安航天动力研究所高级工程师,主要从事结构动力学研究。
|
|
|
|
|
|
|
|
参考文献: |
|
|
[1] 张贵田. 高压补燃液氧煤油发动机[M]. 北京:国防工业出版社,2005 Zhang Guitian. High Pressure Staged Combustion LOX/Kerosene Rocket Engine[M]. Beijing, National Defense Industry Press, 2005(in Chinese)
[2] Ordonneau G, Girard N. Low Frequency Oscillation Phenomena during VULCAIN Shutdown Transient[R]. AIAA-2001-3543
[3] Belyaev E N, Chvanov V K. The Outflow of a Two-Phase Gas-Liquid Mixture from the Mixing Head of a Gas Generator When Starting a Liquid-Propellant Rocket Engine[J]. High Temperature, 2005,43(3):446-451
[4] 刘红军, 张恩昭. 补燃循环发动机启动特性仿真研究[J]. 推进技术, 1999, 20(3):5-9 Liu Hongjun, Zhang Enzhao. Start-UP Simulation of a Liquid Propellant Staged Combustion Rocket Engine[J]. Journal of Propulsion Technology, 1999, 20(3):5-9(in Chinese)
[5] 李程, 杨永强. 500t级液氧煤油补燃发动机起动过程仿真研究[J]. 火箭推进,2014, 40(6):1-7 Li Cheng, Yang Yongqiang. Numerical Simulation of Start-up Process for 500t Thrust LOX/Kerosene Staged Combustion Cycle Rocket Engine[J]. Journal of Rocket Propulsion, 2014, 40(6):1-7(in Chinese)
[6] 李锋, 何泽夏, 孙百红. 液体火箭发动机启动冲击特性研究[J]. 机械强度, 2009, 31(3):375-377 Li Feng, He Zexia, Sun Baihong. Investigation of Start-up Impact Characteristics of Liquid Rocket Engines[J]. Journal of Mechanical Strength, 2009, 31(3):375-377(in Chinese)
[7] 李锋, 邓长华, 鲍福廷. 液体火箭发动机冲击响应谱分析计算方法[J]. 西安工业大学学报, 2009, 29(1):28-31 Li Feng, Deng Changhua, Bao Futing. Analysis of Shock Response Spectrum for Liquid Rocket Engines[J]. Journal of Xi'an Technological University, 2009, 29(1):28-31(in Chinese)
[8] 朱景文, 何昆. 基于弹性力学火箭发动机自锁电磁阀冲击响应分析[J]. 强度与环境, 2013, 40(3):25-30 Zhu Jingwen, He Kun. Impulse Response Analysis of Electromagnetic Valve on Rocket Engine Based on Elasticity[J]. Structure & Environment Engineering, 2013, 40(3):25-30(in Chinese)
[9] 杨德庆, 王德禹, 汪庠宝. 考虑星-箭动力耦合作用结构瞬态响应分析[J]. 宇航学报, 2003,24(2):213-216 Yang Deqing, Wang Deyu, Wang Xiangbao. Structural Transient Response Analysis Considering Satellite-Rocket Dynamic Coupling Effect[J]. Journal of Astronautics, 2003,24(2):213-216(in Chinese)
[10] 马庆镇. 推力终止时结构的载荷识别及瞬态响应分析[D]. 长沙:湖南大学, 2014 Ma Qingzhen. Load Identification and Transient Response Analysis Research on Thrust Termination Structure[D]. Changsha, Hunan University, 2014(in Chinese)
[11] Imregun M, Visser W J. A Review of Model Updating Techniques[J]. The Shock and Vibration Digest, 1991, 23:141-162
[12] Goldman R L. Transient Loads from Thrust Excitations[R]. NASA SP-8030, 1969
[13] 吕海波,李明. 适用瞬态响应计算的火箭结构动力学模型修正方法[J]. 噪声与振动控制, 2013,33(6):11-14 Lu Haibo, Li Ming. An Updating Method for Structural Dynamic Model Applicable for Transient Rocket Response Computation[J]. Noise and Vibration Control, 2013, 33(6):11-14(in Chinese)
[14] 宁建国, 王成. 爆炸与冲击动力学[M]. 北京:国防工业出版社, 2010 Ning Jianguo, Wang Cheng. Explosion and Shock Dynamics[M]. Beijing, National Defense Industry Press, 2010(in Chinese) |
|
|
|
|
|
|
|
