共查询到20条相似文献,搜索用时 125 毫秒
1.
基于SIMULINK的液压伺服系统动态仿真 总被引:4,自引:1,他引:4
本文提出了利用SIMULINK软件包对液压伺服系统进行动态仿真的方法。以阀控液压缸为例建立了液压伺服系统的动态模型,给出了,该系统的仿真模型,详细介绍了如何利用SIMULINK对液压系统的动态特性进行仿真,同时较详细地讨论了影响液压伺服系统动态特性的主要因素。仿真结果表明,SIMULINK方法是对液压伺服系统的动态特性进行仿真的一条有效途径。 相似文献
2.
液压马达滑靴副动态倾侧性能研究 总被引:1,自引:1,他引:0
建立了考虑球铰副摩擦影响的液压马达滑靴副倾侧动态性能模型, 通过计算机仿真, 研究了滑靴副倾侧状态下动态特性以及球铰副摩擦对滑靴副动态性能的影响。 相似文献
3.
利用一种新的非定常流量测量实验技术以及理论分析、频谱分析和参数辨识等方法对三种液压阻尼器的压差—流量非定常特性进行了砭究,确立了其动态数学模型,并通过时域仿真与实验研究对上述模型进行了验证。 相似文献
4.
本文对新型锥式电磁换向阀的结构原理、性能特点以及静动态的液动力作了详细的分析和理论推导,通过实验和产品试制,不仅证明分析正确,而且取得了良好的效果。 相似文献
5.
螺旋桨飞机飞行时,调速器对飞机的飞行稳定性与发动机安全性起着关键作用。分析液压调速器的设计结构及其工作原理;针对调速器、液压系统以及执行机构建立AMESim模型,进行动态特性仿真与分析;对调速器动态特性进行单因素影响分析,主要设计参数包括控制活门质量、配重质量以及弹簧刚度等,再通过多因素影响分析比较得到最优设计参数。对优化后的调速器模型进行动态仿真。研究结果表明:调速器参数优化后,调速振荡幅度和振荡次数显著减小,增加了调速器系统的稳定性,其性能得到了巨大提升,能够更好地满足发动机、螺旋桨的调速要求。 相似文献
6.
7.
8.
9.
10.
11.
12.
板簧特性与电液伺服试验机系统 总被引:2,自引:0,他引:2
本文从汽车板簧的力学特性物电液伺服系统相结合的角度,对电液伺服板簧试验机系统进行了理论分析和试验研究。指出板簧动态试验时变形和负荷的控制不宜相互替代,采用新的模型跟随自适应控制方法,有效地解决了电液伺服板簧试验机波形失真和试验加载频带问题。 相似文献
13.
高速压力机下死点精度试验研究 总被引:2,自引:1,他引:1
使用Rm-72型下死点测试仪器对某高速压力机在空载和有载荷两种情况下进行了下死点测量.在空载时改变滑块重量、运转速度、动平衡配重块重量以及运转时间以获取下死点变化数据,并进行比较分析.测试结果表明:滑块重量增大、运转速度提高以及测试时间延长会导致下死点向下偏移,改变配重块重量对下死点变化不明显.在有载荷时通过对不同型号高速压力机进行下死点测试,发现下死点波形存在差异.测试结果表明:随着速度的提高,下死点附近的波形形态发生改变,结构不同的高速压力机存在波形图的差异.该研究结果有助于高速压力机下死点精度控制. 相似文献
14.
《Acta Materialia》2002,50(11):2813-2824
Jerky flow, or the Portevin-Le Chatelier effect, is investigated at room temperature by applying statistical, multifractal and dynamical analyses to the unstable plastic flow of polycrystalline Al–Mg alloys with different initial microstructures. It is shown that a chaotic regime is found at medium strain rates, whereas a self-organized critical dynamics is observed at high strain rates. The cross-over between these two regimes is signified by a large spread in the multifractal spectrum. Possible physical mechanisms leading to this wealth of patterning behavior and their dependence on the strain rate and the initial microstructure are discussed. 相似文献
15.
《Intermetallics》2000,8(9-11):987-995
The hot deformation behavior of as-cast Ni3Al alloy has been characterized on the basis of its flow stress variation obtained by isothermal constant true strain rate compression testing in the temperature range 1100–1250°C and strain rate range 0.001–10 s−1. The mechanisms of hot working have been evaluated using four generations of materials modeling techniques, which included shape of stress–strain curves, kinetic analysis, processing maps and dynamical systems approach. The material exhibited a steady-state flow behavior at slower strain rates but flow softening associated sometimes with broad oscillations, was observed at higher strain rates. The flow stress data did not obey the kinetic rate equation over the entire regime of testing but a good fit has been obtained in the intermediate range of temperatures (1150–1200°C). In this range, a stress exponent value of 6.5 and an apparent activation energy of about 750 kJ/mol have been evaluated. Microstructural investigations have shown that the matrix γ′ phase undergoes dynamic recovery in the presence of harder γ colonies The processing maps revealed four different domains out of which three are interpreted to represent cracking processes. The fourth domain, which has a peak efficiency of about 44%, occurred at 1250°C/0.001 s−1. Microstructural observations revealed that this domain represents dynamic recrystallization (DRX) of γ phase and is desirable for hot working the material. The material exhibits flow instabilities when deformed in the intermediate temperature regime at strain rates higher than 1 s−1 and these are manifested as shear localization. 相似文献
16.
17.
Coatings by different techniques, mainly in the form of films or particles, have been extensively used to functionalize filaments in the textile industry. In this study, electrospinning was employed to coat polymeric nanofibres on Poly (ethylene terephthalate) multi- and mono-filaments. The parameters in the coating process including solution concentration, coating time, coating distance, electric field and flow rate, were systematically investigated to determine their effects on the resultant coating. The coating morphology and durability were examined by means of scanning electron microscopy and abrasion testing, respectively. Results showed that nanofibres coating on filaments with various morphologies, exhibiting some degree of durability was achieved. 相似文献
18.
19.