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依据切舍了高阶振动后得到的弹性转子系统低阶模型,提出一种有效克服振荡现象的新型H∞控制系统设计方法。通过求解互补灵敏度函数和调整函数在特定频域内的最小混合问题设计了H∞控制器。仿真结果表明,该方法以抑制系统振荡,保证系统鲁棒稳定性具有良好的效果。 相似文献
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H∞方法在振动主动鲁棒控制中的应用 总被引:10,自引:0,他引:10
研究了振动系统频域不确定和参数不确定两种情形的H∞鲁棒控制设计问题,文中对参数不确定情形提出了结构摄动鲁棒稳定与灵敏度函数设计相结合的设计方法。对一个实例的数值仿真结果证实了所提方法的有效性,并且表明H∞方法能够较满意地处理振动控制中的确定性,因而在振动主动鲁棒控制设计中有着较大的应用潜力。 相似文献
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为避免未建模误差对系统性能的影响,本文采用滑模面的频域整形方法提出了一种基于H∞理论设计滑模面的变结构控制器,并将它运用到一泵控马达伺服系统中,并给出仿真结果。 相似文献
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本文给出了具有参数摄动的时滞自治系统二次稳定充分条件,该条件为-Riccati不等式。进而将具有参数摄动的时滞系统鲁棒控制问题等效为H∞标准设计问题。 相似文献
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H∞混合灵敏度控制在液压伺服系统中的应用 总被引:10,自引:0,他引:10
运用H∞混合灵敏度控制理论,针对液压伺服系统的特点,通过仿真,总结了一般加权阵的选取规律和方法,提出采用线性矩阵不等式设计典型电液位置伺服系统H∞控制器的计算方法,并设计了控制器,使系统在保证鲁棒稳定性的同时可以确保系统的瞬态性能指标。通过 设计举例说明了控制器的设计方法,并通过与原系统参数摄动时系统特性的比较,验证了H∞控制器不仅可以提高系统的频宽,改善系统的响应速度,而且可以改善参数变化对系统性能的影响,从而说明际H∞控制器的有效性。 相似文献
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针对设计一级倒立摆系统的H_∞鲁棒控制器时出现的保守性问题,提出了一种以结构奇异值μ理论为依据的μ分析和μ综合方法。首先进行了倒立摆系统的标准H_∞控制器设计,同时运用μ分析的方法证明了系统H_∞控制器存在保守性这一事实,指出了问题的解决方向;其次,针对出现的问题,运用D-K迭代算法设计了修正后的H_∞控制器并加入原系统,修正了原控制器存在的问题;最后从仿真实验结果和与不同干扰抑制度的H_∞控制结果的比较等方面,验证了新方法对降低保守性的实际效果。研究结果表明:新方法降低了原控制器的保守性,同时改善了输出质量,方法有效。 相似文献
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本文从讨论轴流风机级型与动叶理论反作用度Ω_d∞的关系着手,进而讨论了轴流风机按等环量设计时主要气动力参数和结构参数的取值控制,以期达到提高轴流风机效率的目的。在Ω_d∞基础上,又引入静叶的理论反作度Ω_g∞和级的理论反作用度Ω_J∞等新的概念。并对不同Ω_d∞的流体动力学本质作了深刻的阐述。 相似文献
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R. I. Nepershin 《Journal of Machinery Manufacture and Reliability》2011,40(2):140-148
A model of axisymmetric formation of a flange from a flat blank with a hole by expanding by a hard punch with a fixed flat
flange is given, taking into consideration contact friction, change of wall thickness, strengthening of material, and the
tool bending radius. Elastic, elastic-plastic and hard-plastic process stages are studied. 相似文献
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V. N. Danilov 《Russian Journal of Nondestructive Testing》2005,41(8):490-497
The influence of the pulsed operating mode on a bottom echo-signal level reflected from a plane surface of a cylindrical article is studied during variations in the article's radius. It is shown that the pulsed character of a signal smoothens this function significantly as compared to that in the previously computed continuous mode. Numerical estimates of the bottom echo signal have been made for the ultrasonic inspection of wheel-pair axles of railway vehicles. 相似文献
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广州市某冷库一台冷凝器压缩机在试压检漏时发生整体爆炸.经现场调查和对爆炸碎片、残骸的研究,分析了爆炸的过程,判断事故原因为试压工艺问题和操作不当,并给出了改进措施. 相似文献
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The problem of buckling of a thin elastic spherical shell inside a spherical cavity of uniformly contracting massive body is considered. This problem arises, for example, when designing pressure vessels made of composite materials with a thin metal cap layer. It is assumed that at the beginning of the compression the shell fits tightly against the wall of the cavity (to the rigid frame). An algorithm for searching the equilibrium state of the shell in the supercritical state is described. As a result of solving the problem, among other things, critical values of compressive strain and shell configuration in the supercritical state were obtained. 相似文献
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N. A. Kuchinskiy V. A. Baranov V. N. Duginov F. E. Zyazyulya A. S. Korenchenko A. O. Kolesnikov N. P. Kravchuk S. A. Movchan A. I. Rudenko V. S. Smirnov N. V. Khomutov V. A. Chekhovsky 《Instruments and Experimental Techniques》2014,57(5):553-557
Detector rate capability is one of the main parameters for designing a new detector for high energy physics due to the permanent rise of the beam luminosity of modern accelerators. One of the widely used detectors for particle track reconstruction is a straw-detector based on drift tubes. The rate capability of such detectors is limited by the parameters of readout electronics. The traditional method of increasing detector rate capability consists in increasing their granularity (the number of “elementary” detectors = readout channels) by reducing the straw diameter and/or by dividing the straw anode wire into two parts (for decreasing the rate per readout channel). A new method of designing straw detectors with a high rate capability is presented and tested. The method is based on dividing the straw cathode into parts and the independent readout of each part. 相似文献
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A. S. Ivanov M. M. Ermolaev V. I. Grek E. N. Nikol’skaya 《Russian Engineering Research》2010,30(3):224-227
A tight joint subjected to a torque is considered, in the case of pliability of the joint components and tangential pliability
of the contact layer. On that basis, the torque distribution over the joint length may be determined more precisely, and fretting
wear may be predicted. 相似文献
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I. K. Aleksandrov 《Russian Engineering Research》2014,34(4):275-276
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Improvement in the running-in of internal combustion engines by applying copper and antifrictional coatings to the cylinder
surface is considered. The recommended optimal conditions correspond to higher surface quality and shorter running-in. 相似文献