共查询到19条相似文献,搜索用时 156 毫秒
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结构静力试验是研究复杂工程构件静特性的重要手段,是鉴定产品结构的设计静强度的主要方法。电液伺服静力加载系统是进行静力试验的关键设备。设计一种基于直动式数字阀的电液力伺服加载系统,采用了直动式数字伺服阀与经典PID控制相结合,提高了系统的加载精度与动态响应速度,取得了比较好的实验效果。 相似文献
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对CPC电液伺服控制系统进行设计选型,分别建立伺服放大器、伺服阀、阀控非对称缸以及电液伺服控制系统的数学模型,并进行仿真分析。仿真结果证明所设计的控制系统数学模型是正确可行的。文中研究工作对实现该控制系统的国产化、降低钢铁企业在实际生产中的备件和维护成本,具有重要意义。 相似文献
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电液伺服协调加载系统的神经网络自学习PSD控制 总被引:8,自引:1,他引:7
从电液伺服协调加载系统的特点出发,提出一种基于神经网络在线自学习PSD控制方法。该方法简单,实用,便于在线实现。控制器无须事先训练,参数选取极具一般性,适用范围广,控制精度高且鲁棒性强,采用这一方法实现了对某大型电液伺服结构试验装置的协调加载控制,控制品质优良。 相似文献
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针对航空发动机空中试验过程中液压功率提取的试验要求,采用电液伺服控制系统,研制航空发动机飞行台液压加载系统,以实现被试发动机飞行台试验过程中,液压加载无级可调的要求。试验结果表明:在被试发动机飞行台试验中,该系统可以按要求定量模拟液压功率提取,满足系统设计指标。 相似文献
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本文对次级调节扭矩伺服加载系统的工作原理进行了详尽的分析,给出了系统的传递函数方框图,设计了用于加载系统的带加权因子的模糊控制器,对加载系统的两个主要组成部分转速和扭矩控制系统在不同输入信号下分别进行了试验研究,同时还对二者之间的相互干扰进行了试验研究。 相似文献
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装甲车辆扭杆裂纹的声发射检测 总被引:1,自引:0,他引:1
采用常规的无损检测手段检测装甲车辆悬挂系统扭杆裂纹损伤比较困难。为了方便地检测扭力轴上的裂纹缺陷,提出了利用声发射技术在扭杆加载状态下,检测裂纹损伤的方法。为此基于虚拟仪器的原理,采用便携式工控机、高速数据采集卡、高灵敏传感器、手动液压加载装置构建了扭杆检测硬件系统,并编制了专用的检测定位软件。通过实际应用试验,成功地检测到了被测装备扭杆上的损伤。通过对比分析可得,基于声发射技术的动态检测方法是解决扭杆裂纹静态检测的有效办法。 相似文献
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M.L. Young S. Gollerthan A. Baruj J. Frenzel W.W. Schmahl G. Eggeler 《Acta Materialia》2013,61(15):5800-5806
Crack extension in pseudoelastic binary NiTi shape memory alloy (SMA) compact tension (CT) specimens was examined during static loading. The material composition of 50.7 at.% Ni (austenitic, pseudoelastic) was investigated using high-energy synchrotron X-ray diffraction. A miniature CT specimen was developed, which is small enough to allow in situ testing in a synchrotron beam line to identify phases, textures and lattice strains in front of a crack tip. Stress-induced martensite in pseudoelastic NiTi SMAs was mapped in front of the crack of a CT specimen during static loading using synchrotron radiation. The phase volume fraction and lattice microstrain results are discussed and compared with results from thermographic measurements. The Poisson effect is observed by comparing the lattice strains in the loading direction and transverse to the loading direction. 相似文献
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Il Song Park Sang Yong Won Tae Sung Bae Kwang Yeob Song Charn Woon Park Tae Gwan Eom Chang Mo Jeong 《Metals and Materials International》2008,14(2):133-138
This study evaluates the fatigue limits for five implant-abutment combinations. Each implant-abutment system was tightened
with a closing torque of 32 N-cm. The test specimen was loaded at an inclination of 30 degrees with respect to the loading
axis after fixing it 11 mm away from the fixed point. A cyclic compression load was applied at loading cycles of 10 Hz using
a hydraulic dynamic testing machine (Model 8516, Instron, USA). The highest and lowest mean static strength was observed in
the EXZRTS (1772.2 N) and INTIWS (893.8 N), respectively. The fatigue limits that guarantee a life of 5×106 cycles ranged from 300 N to 800 N. The mean static strength of the external hex type was higher than that of the internal
type. However, the fatigue strength of the internal type was higher than that of the external hex type. The fatigue strength
of the external hex type with a zirconia abutment was higher than that with the titanium abutment. Fatigue fracture of the
zirconia abutment occurred after crack propagation by chipping in the contact position of the margin. 相似文献