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3D TRANSIENT COUPLED THERMOELASTIC-PLASTIC CONTACT SEAlinG ANALYSIS OF REACTOR PRESSURE VESSEL

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Chinese Journal of mechanical Engineering 2005年第4期18卷 473-476页

作者： Du Xuesong li runfang lin Tengjiao state key laboratory of mechanical transmission Chongqing University Chongqing 400044 China

Sealing analysis of sealing system in reactor pressure vessels is relevant with multiple nonlinear coupled-field effects, so even large-scale commercial finite element software cannot finish the complicated analysis. A finite element method of 3D transient coupled thermo-elastic-plastic contact sealing analysis for reactor pressure vessels is presented, in which the surface nonlinearity, material nonlinearity, transient heat transfer nonlinearity and multiple coupled effect are taken into account and the sealing equation is coupling solved in iterative procedure. At the same time, a computational analysis program is developed, which is applied in the sealing analysis of experimental reactor pressure vessel, and the numerical results are in good coincidence with the experimental resuits. This program is also successful in analyzing the practical problem in engineering.

关键词： Pressure vessel Sealing analysis Finite element method

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石油钻井机械钻速预测研究进展

石油钻探技术 2004年第1期32卷 10-13页

作者：林元华宗玉宇梁政施太和李润方西南石油学院石油管力学和环境行为重点实验室四川成都610500 塔里木石油勘探开发指挥部新疆库尔勒841000 重庆大学机械传动国家重点实验室重庆400000

预测机械钻速研究的进展大体可以分为三个阶段:用现场数据直接统计出钻速方程;考虑所钻地层性质和钻头结构的钻速方程;用计算机仿真方法来预测机械钻速。对每个时期的机械钻速预测研究的情况作了详细介绍,并分析了其优缺点,指出用计算... 详细信息

预测机械钻速研究的进展大体可以分为三个阶段:用现场数据直接统计出钻速方程;考虑所钻地层性质和钻头结构的钻速方程;用计算机仿真方法来预测机械钻速。对每个时期的机械钻速预测研究的情况作了详细介绍,并分析了其优缺点,指出用计算机仿真方法来预测机械钻速是可行的,也是今后机械钻速预测研究的重点方向。

关键词：石油钻井机械钻速钻头岩层性质钻进参数

Performance Improvement of the LM Device and Its Application to Precise Measurement of Motion Trajectories within a Small Range with a Machining Centre

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Modern mechanical Engineering 2012年第3期2卷 71-85页

作者： Hua Qiu Yong Yue Akio Kubo chao lin Kai Cheng Dehong Huo Dayou li 1Department of mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Advanced Manufacturing and Enterprise Engineering Department School of Engineering and Design Brunel University Uxbridge UK Department of Computer Science and Technology University of Bedfordshire Luton UK Department of mechanical Engineering Faculty of Engineering Kyushu Sangyo University Fukuoka City Japan Product Design and Engineering Department School of Engineering and Information Sciences Middlesex University London UK state key laboratory of mechanical transmission Chongqing University Chongqing China

In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre;2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer;and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested.

关键词： Motion Accuracy Measurement Device Performance Improvement Small Size Motion Machining Centre

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垂直型多级位移放大机构设计与力学解析建模

中国机械工程 2021年第8期32卷 908-915,937页

作者：林超沈忠磊李坪洋郑山重庆大学机械传动国家重点实验室重庆400044

针对压电位移放大机构在垂直方向较难实现大行程、高频带宽度的问题,结合两个复合菱形机构、两个杠杆机构以及一个普通菱形机构,提出了一种垂直型多级位移放大机构。基于能量守恒方法和弹性梁理论建立了位移放大比和输入/输出刚度解析模... 详细信息

针对压电位移放大机构在垂直方向较难实现大行程、高频带宽度的问题,结合两个复合菱形机构、两个杠杆机构以及一个普通菱形机构,提出了一种垂直型多级位移放大机构。基于能量守恒方法和弹性梁理论建立了位移放大比和输入/输出刚度解析模型,根据拉格朗日方程推导了固有频率解析模型。通过有限元法对解析模型进行了验证,所建立的位移放大比解析模型有较高的预测精度,可为大行程垂直型柔顺平台的优化设计提供参考。与文献中的位移放大机构性能对比结果表明,提出的垂直型位移放大机构具有更好的静动态平衡性能,其位移放大比可达43.29,同时保持一个较高的固有频率561.28 Hz。

关键词：压电驱动器位移放大机构柔性铰链力学解析垂直运动

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压电驱动微夹持器特性分析

仪器仪表学报 2019年第7期40卷 224-232页

作者：林超李坪洋沈忠磊余江郑山重庆大学机械传动国家重点实验室

针对微夹持器的大行程、低耦合等要求,采用桥式机构和杠杆机构设计了一种新型三级放大微夹持器。根据柔性机构学、弹性力学和动力学原理,优化了桥式机构的固定位置提高微夹持器的动态特性,建立了微夹持器的理论位移放大模型、耦合误差... 详细信息

针对微夹持器的大行程、低耦合等要求,采用桥式机构和杠杆机构设计了一种新型三级放大微夹持器。根据柔性机构学、弹性力学和动力学原理,优化了桥式机构的固定位置提高微夹持器的动态特性,建立了微夹持器的理论位移放大模型、耦合误差模型和动力学模型,获得了微夹持器的输出位移特性与动态特性。应用3D打印和线切割加工技术加工出微夹持器实体,通过理论、仿真和实验数据对比验证了理论模型的正确性,微夹持器的位移放大倍数达到了19. 7倍,固有频率为223 Hz,与实验数据的误差均在10%以内波动,工作行程达到了750μm同时耦合误差仅为工作行程的0. 35%,实现了微夹持器大行程、高精度、低耦合和良好的动态特性。

关键词：微夹持器固定约束耦合误差大行程 3D打印