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在分析当前冶金行业炉前移盖机的种类和结构特点的基础上,设计的一种臂架摆动式全回转式炉前移盖机,其结构简单、重量轻、造价低、使用维护方便。应用有限元分析软件ANSYS,对炉前移盖机的臂架结构进行了有限元计算,为炉前移盖机的结构设计提供参考。 相似文献
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Swing Suppression and Accurate Positioning Control for Underactuated Offshore Crane Systems Suffering From Disturbances 下载免费PDF全文
Offshore cranes are widely applied to transfer large-scale cargoes and it is challenging to develop effective control for them with sea wave disturbances. However, most existing controllers can only yield ultimate uniform boundedness or asymptotical stability results for the system’s equilibrium point, and the state variables’ convergence time cannot be theoretically guaranteed. To address these problems, a nonlinear sliding mode-based controller is suggested to accurately drive the boom/rope to their desired positions. Simultaneously, payload swing can be eliminated rapidly with sea waves. As we know, this paper firstly presents a controller by introducing error-related bounded functions into a sliding surface, which can realize boom/rope positioning within a finite time, and both controller design and analysis based on the nonlinear dynamics are implemented without any linearization manipulations. Moreover, the stability analysis is theoretically ensured with the Lyapunov method. Finally, we employ some experiments to validate the effectiveness of the proposed controller. 相似文献
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中综述了对汽车起重机臂架系统进行全面动态分析时的计算模型,各工况的分析方法,特别是臂架系统变幅工况的非线性分析,风致涡激振动分析和动态稳定分析,并且介绍了所开发的臂架结构动态分析系统ELDYNARM。 相似文献
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针对混凝土泵车臂架模态分析中液压油缸难以精确模拟的问题,推导了液压油的等效刚度公式,结合臂架液压系统特点,建立了臂架液压油缸的等效模型,得出了臂架任意姿态下液压缸的等效刚度与密度公式.运用上述方法对某臂架两种典型姿态进行模态分析,并进行对应姿态的固有频率测试,所得结果验证了提出的液压油缸等效方法的准确性. 相似文献
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大型轮式装载机动臂部件是关键结构件,在恶劣工作环境中,容易因破坏而失效。采用两种方法对其进行分析:一种是应用多体动力学与有限元相结合的方法,首先在ADAMS中建立装载机整体结构件系统的刚-弹耦合动力学模型,进行作业过程的动力学分析,然后在ANSYS中建立整体结构件系统的三维有限元模型,研究各部件间连接的模拟,对装载机工作过程典型工况进行有限元分析,获得动臂结构性能特征;另一种是应用传统方法,对动臂部件单独分析,找到动臂上的危险部位。对两种方法进行对比,结果表明:刚-弹耦合整体系统结构分析,可精确求得各铰点受力大小,使整个系统动力学仿真更加接近真实情况。基于刚-弹耦合的多体系统模型,考虑各部件间相互影响,可以更加直观地发现整体结构中的薄弱部位,而薄弱环节就是实际使用中出问题的部位,由此说明装载机刚一弹耦合整体系统结构分析的合理性与实用性。 相似文献
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Boom clay formation is a potential natural host rock for geological disposal of high-level nuclear waste in Belgium.Heating pulse tests with controlled power supply(maximum temperature was limited to 85℃) and controlled hydraulic boundary conditions were performed under nearly constant volume conditions to study the impact of thermal loading on the clay formation.Selected test results of intact borehole samples retrieved in horizontal direction are presented and discussed.The study focuses on the time evolution of temperature and pore water pressure changes along heating and cooling paths,i.e.pore pressure build-up during quasi-undrained heating and later dissipation at constant temperature. 相似文献