排序方式: 共有103条查询结果,搜索用时 15 毫秒
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微机控制液压万能试验机在拉伸实验中的应用 总被引:2,自引:0,他引:2
郑淑玲 《中国教育技术装备》2007,(5):29-30
本文通过对材料力学拉伸实验的教学体会,全面介绍了微机控制液压万能实验机的功能特点、结构原理及操作要点,旨在对微机控制液压万能试验机的推广应用提供有益的参考。 相似文献
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Simulation investigation on fluid characteristics of the water hydraulic jet pipe servo valve (WHJPSV) is conducted through a commercial computational fluid dynamics (CFD) software package FLUENT. In particular, the factors to fluid characteristics of WHJPSV are addressed, which include diameter combination of jet pipe and receiver pipe, jet pipe nozzle clearance, angle between two jet receiver pipes and deflection angle of the jet pipe. It is concluded from the results that: (i) Structural parameters have ... 相似文献
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伺服系统频率特性测试方法研究 总被引:2,自引:0,他引:2
伺服系统是一种广泛应用于各个行业的控制系统,其频率特性是其最重要的特性之一。研究了伺服系统的各种频率特性测试方法,并在嵌入式工控机组成的测试系统上,以某电液伺服系统为测试对象,用Delphi语言编程对频率特性测试方法进行了实验验证;将各种伺服系统频率特性测试方法进行比较,分析总结了各种测试方法的优缺点。 相似文献
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The backstepping technique is one of the tools which provides control Lyapunov functions (CLFs) and, therefore, control laws for automatic systems. In this paper, the backstepping design for position and force nonlinear electrohydraulic servos is investigated. Three control laws ensuring the asymptotic stability of references tracking are obtained by constructing CLFs on the errors concerning the state variables and theirs desired values. The possibility of converting a position servo into a force servo, with only minimal hard modification, is proved. An approach based on partitioning the state system into two subsystems—a first one stable, and a second one taken as framework of control synthesis by backstepping technique—was developed and used. Using as reference point a flight controls hydromechanical servo, numerical simulations were reported from viewpoint of servo time constant performance. Certain conjectures, concerning the behaviour of systems mathematical models, in connection with mathematical methodologies of control synthesis operating on them, are finally stressed. 相似文献
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李伟 《石家庄铁路职业技术学院学报》2008,7(1):40-43
通过对基于图像的视觉伺服系统的数学模型推导,分析线性化模型在平衡点附近的稳定性,然后利用LMI把Delta算子的闭环极点配置在D区域内,解决Delta域内的极点配置问题. 相似文献
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林剑辉 《中国现代教育装备》2012,(15):47-48,52
针对当前模糊控制的发展,将LabVIEW仿真系统引入模糊控制教学中,详细讲解了LabVIEW中如何设立变量模糊隶属函数,建立模糊控制规则,以电液位置伺服系统为例,建立模糊控制仿真系统,并与普通闭环控制结果进行对比,加深学生对模糊控制的理解,提高学习主动性,提升教学效果。 相似文献
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荆萃 《天津职业院校联合学报》2012,14(5):80-84
文章对连续式包装机纵封牵引、横封驱动的控制方法进行深入研究。研究实践表明该控制方法则有效解决了目前连续式全自动包装机(不等速(偏心轮)传动机构)客观存在的问题,且整机高速运行优势明显提高。 相似文献