摘要
离心机是惯性导航系统加速度计的标定设备,转盘变形将严重影响标定精度。基于耦合理论研究了离心机流-热-固多场耦合问题的数值计算方法,分析了此类问题的全耦合数学模型,研究了求解数学方程的强、弱耦合算法及其应用。根据耦合方式不同定义了三种分析方法:直接法、顺序迭代法和顺序耦合法,建立了它们与强、弱耦合算法的联系。验证方法正确性后,对比离心机温度场强、弱耦合算法的计算结果发现,强耦合算法计算时间长,但模拟细节好,更接近真实情况,弱耦合算法计算时间短,但精度较低,故采用强耦合算法计算离心机流场和温度场。三种分析方法计算热-结构耦合的结果相近,故选择顺序耦合法计算离心机结构变形。
A centrifuge is a calibrating device for the accelerometer in inertial navigation system, and the deformation of the rotator could seriously affect the calibrating accuracy. The numerical methods of fluid-heatsolid physics coupling of precision centrifuge are studied based on the coupling theory. The mathematical models of multi-physics coupling are presented, and the strong and weak coupling algorithms to solve the coupling-equations are introduced. Three analysis methods（i.e. the direct method, the sequence iteration method and the sequential coupling method） are defined according to different coupling modes, and the relationship with strong /weak coupling algorithm is given. After validating the proposed methods, the results of centrifuge temperature field by the two algorithms are compared, and it is found that the computation time of the strong coupling algorithm is longer, but the simulation results are better and are closer to the real situation. The calculation time of the weak coupling algorithm is shorter, but its accuracy is lower. Thus the strong coupling algorithm is adopted to simulate the centrifuge＇s fluid field and temperature field. Due to the results from three analysis methods are close to each other, the sequence coupling method is selected to calculate the thermal deformation.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2016年第2期275-280,共6页
Journal of Chinese Inertial Technology
基金
国家重大科学仪器设备开发专项(2011YQ130047)
关键词
多场耦合
计算方法
离心机
流场
温度场
结构场
multi-physics coupling
calculation method
centrifuge
fluid field
temperature field
structure field
