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中文摘要：
稳定平台安装在旋转导向钻井工具的内部，对其外形尺寸有特殊要求，要求尽可能地细小，同时又要承载巨大的动态冲击载荷，所以旋转导向钻井工具稳定平台的刚度和稳定平台控制轴的强度直接关系到稳定平台能否正常工作及其寿命的长短。针对开发设计的稳定平台进行了静力学分析，分别建立了稳定平台刚度分析和控制轴强度分析的力学模型，利用有限元分析软件计算了稳定平台的刚度和控制轴的强度。从计算结果可以看出，稳定平台控制轴的最大应力不超过306MPa．发生在靠近下轴承处，强度安全系数大于2．7，满足强度要求。发电机涡轮处最大横向位移为0．528mm，刚度安全系数大于2．8，满足刚度要求。稳定平台最大挠度为3．321mm，偏大，可能会影响稳定平台的动态平衡性能，有必要进一步采取措施，改进设计。
英文摘要：
A stabilized platform is installed inside a rotary-steering drilling tool. It is subjected a huge dynamic impact, and meanwhile its dimensions have to be as small as possible. Therefore, both the rigidity of a stabilized platform and the strength of its control axles are crucial factors that directly determine its work conditions and its life. For the stabilized platform designed by the authors, two mechanical models are established respectively to analyze the rigidity of stabilized platform and the strength of its control axles. The rigidity and the strength are computed using finite element software based on the two models. The computational results indicate that the maximum stress of a control axle is 306 MPa which occurs nearby the lower bearing with a permitted strength safety factor of more than 2.7, the maximum lateral deformation of its turbine generators is 0. 528 mm with a permitted rigidity safety factor more than 2.8, the maximum deflection of the whole stabilized platform is 3. 321 mm. This deflection, a little bit larger than permitted, may be harmful to the dynamic balance performance of a stabilized platform. Therefore, it is necessary to take further measures to improve the design.
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