共查询到20条相似文献,搜索用时 93 毫秒
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PZT材料中内应力分析 总被引:1,自引:0,他引:1
用压痕测试技术分析了PZT材料极化前后的内应力大小和分布情况,并提出了有关模型进行解释。极化前,内应力各向同性,内应力的分布,对材料宏观力学性能如强度和断裂韧性,都将产生较大的影响。 相似文献
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替代工质用润滑油添加剂的作用机理研究 总被引:1,自引:0,他引:1
通过文献检索和试验研究,分析了与空调制冷用替代工质相匹配的润滑油性能的不足,指出这些不足可以通过添加不同的润滑油添加剂来弥补。进一步分析了各种空调制冷用润滑油添加剂的作用机理,并对极化制冷润滑油添加剂PROA的作用效果进行了试验研究。结果表明PROA可以改善系统的润滑性能,延长压缩机的寿命。 相似文献
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一类新型的聚氨酯类二阶非线性光学材料 总被引:1,自引:0,他引:1
报道了一类新型的含对硝基苯偶氮苯烷基胺发色团的热交联型二阶非线性光学聚合物的合成和极化工艺。将分散红-19、甲苯二异氰酸酯和三乙醇胺预反应生成的溶胶-凝胶液旋转涂膜后在160℃电晕极化1h可制得光学性质良好的极化膜。采用可见光谱测定了极化膜取向发色团的序参数及其取向的热稳定性。用一维刚性取向气体模型计算极化膜的二阶非线性光学极化系数x^(2)达10^-7esu量级。该极化膜有良好的取向稳定性,在1 相似文献
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胶州市水产冷藏厂在中强企业管理方面,了能降耗当作重中之重的工作来抓,收到了较好的效果。在制冷系统中添加了美国魏林森(williamson)公司生产的极化制冷油添加剂(英文缩写“PROA”Polarzied Refigerant Oil Additive),使制冰平均降低电耗18.1%,冷藏平均降低电耗19.2%,节能效果令人满意。 相似文献
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聚氨酯/环氧树脂互穿网络二阶非线性光学材料 总被引:6,自引:0,他引:6
制备了一类新型的各含对硝基苯偶氮苯胺发色团的聚氨酯和环氧树脂的互穿网络型二阶非线性光学聚合物。用程序升温及升压电晕极化法可制得有良好光学质量的极化膜。DSC曲线显示该互穿网络聚合物有1个玻璃化转变温度。在一维刚性取向气体模型的基础上,通过可见吸收光谱研究了该极化膜的非线性光学性质。其二阶非线性光学极化系数可达10^-7esu量级,发色团有优异的取向稳定性,其序参数在100℃仍可长期稳定。 相似文献
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Pt/PZT/Pt电容的γ射线辐照积累剂量效应 总被引:1,自引:0,他引:1
研究了辐照积累剂量对PZT铁电电容的电滞回线和C-V特性的影响,结果表明,在积累剂量辐照过程中,由于辐照感生缺陷的影响,剩余极化和矫顽场增加。介电常数下降。根据实验结果和铁电材料的有关辐照理论,提出了剩余极化随积累剂量变化的缺陷相关模型。 相似文献
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半主动控制电流变液压悬置隔振性能仿真研究 总被引:2,自引:0,他引:2
对半主动控制式电流变液压悬置的结构及工作原理进行了描述,考虑阻尼通道及电流变液的特性,建立了该悬置的动力学仿真模型.选择模糊控制作为控制算法,通过仿真计算研究了该悬置的隔振性能.利用ADAMS软件,建立了汽车动力总成悬置系统的六自由度动力学模型,对采用半主动控制式电流变液悬置的动力总成系统进行了仿真研究,并将其结果与采用被动悬置的动力总成系统的振动特性进行了比较分析.研究结果表明:施加控制之后,动力总成的振动将大为降低,这说明采用半主动控制式电流变液压悬置能很好地改善悬置的隔振性能. 相似文献
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电流变液在流体控制中的应用 总被引:3,自引:0,他引:3
电流变液作为工作介质应用于流体控制系统,可用于没有机械运动部件的流体控制阀,阀的流量和压降可直接由电场信号来调节。介绍了电流变阀的设计准则,设计制作了4件电流变阀组成一流体控制元件用于流体动力控制,并对不同电场强度下的流量、压力特性等进行了理论和实验分析。 相似文献
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M. Asgari H. Foratirad M. Golabadi M. Karimi M.G. Gholami 《Materialwissenschaft und Werkstofftechnik》2021,52(5):511-519
In this study, the effect of amino-based additives including ammonia, ethanolamine and a mixture of two additives on the pH change of condenser water and corrosion behavior of aluminum bronze alloy as a structural material of condenser were investigated. The results of polarization curves, wheel tests and inductively coupled plasma showed that by increasing the pH from 8.5 to 10.5, the corrosion rate of aluminum bronze alloy and the dissolution rate of alloying elements are increased. The effect of amino-based additives at the same pH is similar to each other. A comparison of corrosion rates determined by polarization curves. The corrosion rates for solutions contained ammonia and ethanolamine additives at pH = 10.5, were 2.92 ⋅ 10−2 and 4.55 ⋅ 10−2 mm/y respectively. The wheel test results indicated that the corrosion rates of solutions containing different additives increased to 1.1028 mm/y and 0.4504 mm/y for solutions containing ammonia and ethanolamine, respectively. Therefore, due to similar environmental conditions in the condenser and the wheel test because of the presence perturbation and biphasic fluid, it can be concluded that at pH above 10, aluminum bronze alloy has lower corrosion rate in the cooling water containing ethanolamine than ammonia additives. 相似文献
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介绍采用ER流体的筒式半主动座椅减振器车辆的平顺性模拟.建立具有针对系统不确定的内部鲁棒性的滑模控制器,通过控制电场来控制座椅的振动水平.模拟计算结果表明,采用半主动悬架时,在共振频率附近位移和加速度的传输率得到实质性的减小;当汽车驶过不平路面时,从半整车模型的位移和加速度的频率响应的整个频域段来看,采用ER流体半主动悬架汽车的性能得到了很大提高.特别是在1Hz以上频率段,位移和加速度传输率都得到了显著减小.表明通过采用ER流体半主动悬架能够很好地提高车辆的行使平顺性. 相似文献
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Radiation heat transfer control through the application of an electric field upon an Electroheological (ER) fluid based composite material is an innovative new area of research. A conceptual experiment has been conducted to study radiation heat transfer through a composite window featuring an ER fluid. The composite window is composed of two thin glass plates with a layer of ER fluid contained between them. The glass walls were transparent except for a very thin coating of an electric-conductive film which enabled the inside of the glass surfaces to serve as electrodes. The ER fluid was contained between the glass surfaces and consisted of a suspension of micron sized crystalline zeolite particles in a silicon oil. This study has demonstrated the unique capability of ER fluids to regulate and control radiation heat transfer via transmittance measurements. A semi-empirical model is developed from the experimental data to correlate the dependence of radiation transmission through ER fluids based on several physical parameters (fv, V*, and L). This model agrees reasonably well with the measured data. The results obtained in this study are very important to those concerned with the development of a thermally smart material for heat transfer control.Presented at the Second Minsk International Heat and Mass Transfer Forum, May 18–22, 1992. 相似文献
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Summary This paper presents vibration control responses of an electrorheological (ER) damper system subjected to temperature variation
and time delay. The field-dependent yield stress of the ER fluid is experimentally evaluated at various temperatures and the
dynamic characteristics of the ER damper are investigated in order to obtain the time constant. These two properties are integrated
with the governing model of a quarter car ER suspension system, and a sliding mode controller is formulated. Vibration control
responses of a quarter car model installed with the ER damper system are evaluated under bump excitation. 相似文献