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连续油管用闸板防喷器矩形胶芯的特性研究 被引量:4
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作者 刘冰 李涛 +4 位作者 周婷婷 任宣铭 庄会涛 韩宝坤 尹恩来 《山东科技大学学报(自然科学版)》 CAS 北大核心 2018年第3期123-128,共6页
针对井控风险中闸板防喷器密封胶芯经常在关键密封位置失效这一问题,设计了连续油管用闸板防喷器的矩形胶芯,建立了矩形胶芯的三维物理模型,运用静力学理论进行其力学性能分析,胶芯受力考虑为液压推力和井内介质压力的相互累加作用,进... 针对井控风险中闸板防喷器密封胶芯经常在关键密封位置失效这一问题,设计了连续油管用闸板防喷器的矩形胶芯,建立了矩形胶芯的三维物理模型,运用静力学理论进行其力学性能分析,胶芯受力考虑为液压推力和井内介质压力的相互累加作用,进而推导出矩形胶芯密封力计算式。运用有限元法进行材料非线性分析,研究了弹塑性能,得到矩形胶芯可承受的最大液压推动力是19 MPa,当0≤F0≤8 MPa时,为弹性变形阶段;当8<F0<10 MPa时,为弹塑性变形阶段;当10≤F0≤19 MPa时,胶芯塑性变形显著。并用ANSYS疲劳寿命分析工具,得出矩形胶芯在10 MPa液压推动力下的疲劳寿命循环次数约为134 700,疲劳使用系数为0.074 26。研究表明,该矩形胶芯能够有效解决常规胶芯在关键密封位置失效的问题。 展开更多
关键词 连续油管 闸板防喷器 矩形胶芯 有限元分析 疲劳寿命
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Aircraft Optimal Separation Allocation Based on Global Optimization Algorithm
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作者 ren xuanming TANG Xinmin 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2022年第6期707-720,共14页
A dynamic programming-sequential quadratic programming(DP-SQP)combined algorithm is proposed to address the problem that the traditional continuous control method has high computational complexity and is easy to fall ... A dynamic programming-sequential quadratic programming(DP-SQP)combined algorithm is proposed to address the problem that the traditional continuous control method has high computational complexity and is easy to fall into local optimal solution.To solve the globally optimal control law sequence,we use the dynamic programming algorithm to discretize the separation control decision-making process into a series of sub-stages based on the time characteristics of the separation allocation model,and recursion from the end stage to the initial stage.The sequential quadratic programming algorithm is then used to solve the optimal return function and the optimal control law for each sub-stage.Comparative simulations of the combined algorithm and the traditional algorithm are designed to validate the superiority of the combined algorithm.Aircraft-following and cross-conflict simulation examples are created to demonstrate the combined algorithm’s adaptability to various conflict scenarios.The simulation results demonstrate the separation deploy strategy’s effectiveness,efficiency,and adaptability. 展开更多
关键词 optimal separation allocation sequential quadratic programming dynamic programming globally optimal control optimal control law
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