Changing law of launching pitching angular velocity of rotating missile
Guang Liu, Bin Xu, Xiaojuan Jiao, Tiesheng Zhen, Chinese Journal of Aeronautics, October 2014, Volume 27, Issue 5, pp 1171-1179.
Abstract
In order to provide accurate launching pitching angular velocity (LPAV) for the exterior trajectory optimization design, multi-flexible body dynamics (MFBD) technology is presented to study the changing law of LPAV of the rotating missile based on spiral guideway. An MFBD virtual prototype model of the rotating missile launching system is built using multi-body dynamics modeling technology based on the built flexible body models of key components and the special force model. The built model is verified with the frequency spectrum analysis. With the flexible body contact theory and nonlinear theory of MFBD technology, the research is conducted on the influence of a series of factors on LPAV, such as launching angle change, clearance between launching canister and missile, thrust change, thrust eccentricity and mass eccentricity, etc. Through this research, some useful values of the key design parameters which are difficult to be measured in physical tests are obtained. Finally, a simplified mathematical model of the changing law of LPAV is presented through fitting virtual test results using the linear regression method and verified by physical flight tests. The research results have important significance for the exterior trajectory optimization design.In this paper we describe the necessity and significance of coal preparation plant inspection robot, propose the robot design requirements and design the system framework of hardware and software. Then we use RecurDyn software to simulate and analysis the stability and fitness of the inspection robot in coal preparation plant complex environment based on virtual prototype technique.
How Multibody Dynamics Simulation Technology is Used
A multi-flexible body dynamics (MFBD) virtual prototype of a missile launching system is simulated using the RecurDyn FFlex module. A meshed model of the missile and the launching canister were imported into RecurDyn to perform dynamic analysis. The stress profile of the missile and launching canister were obtained where instrumentation for physical testing would be difficult.
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