Preparation Process and Optimization Design for Composites Rudderpost in the Long-Time High Temperature Environment

Rudder is an important part for the glider aircraft. In order to satisfy the long-time high-velocity for the near-space vehicle in the atmosphere, the light- weight, high-stiffness and high-strength all-composites rudderpost is required urgently to be prepared. The all-composites rudderpost can keep high rudder efficiency in the high temperature environment. Based on the technique require-ment of high-performance composites rudder, a 3D C/SiC rudderpost was manufactured by the CVI-CMC-SiC [1] processes. It was found during rudderpost testing that the high-temperature mechanical properties decreased and had large discretization. The analysis of the failure mechanisms was conducted by FTA method to recognize the failure modes and main reasons for rudderpost abnormal fracture and to reproduce the fracture phenomenon, which could guide production company to modify their preparation process control. Then the modified processes were proved to be validated. And the stability and reliability of the production performances were improved.

船舶舵轴轴承结构摩擦激振仿真分析

为避开有关摩擦激振不一定正确的假设和机理,直接从润滑脂特性数据出发,采用分段插值方法对船舶舵轴轴承结构摩擦激振现象进行仿真研究。计算机模拟并预测了摩擦激振现象,分别从时域和频域分析了各参数对摩擦激振的影响,并建议通过适当增加阻尼、规避振动区域、改善低速性能等方式避免船舶舵轴轴承结构发生摩擦激振或减小摩擦激振的影响,为进一步研究奠定了基础。

航天测量船舵机轴承的防腐蚀措施

针对某型航天测量船舵机轴承腐蚀较快的现实问题,分析了在不同航速条件下舵机轴承参与电化学腐蚀反应的水湿环境的变化,分析了舵机轴承油膜分布不均、油质较差问题的数值分布模型;并分别从建立电化学保护、改进润滑油膜分布、改善水湿环境等3个方面提出了系统化的舵机轴承的防腐蚀技术措施。该技术措施的试用性验证及适用性设计完善,技改简单、成本较低、工作可靠性高、可维护性强,具有较为重要的社会及经济效益。

基于波动有限元方法的舵轴振动分析

对波动有限元方法进行研究,推导了波动有限元方程,并建立波动有限元动力学模型。然后使用该方法分析了水下机器人舵轴的振动特性,并验证了分析的准确性,证明了采用波动有限元方法分析振动响应的优势,求出了结构振动时的功率流解,为下一步的结构振动控制提供了理论铺垫,为水下机器人结构振动分析提供了一种更精确的分析手段。