共查询到19条相似文献,搜索用时 93 毫秒
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设计了一种基于非晶态合金的可同时检测转速和转矩的新型传感器.介绍了传感器的结构、工作原理,并分析了它的输出灵敏度特性和非线性误差,还进行了静态标定试验和动态模拟试验.静态试验分析了传感器的静态特性以及气隙、线圈匝数、激磁电流强度及频率对检测灵敏度的影响等.动态试验采用柴油机为加载动力,分析了温度、电磁和振动干扰对传感器性能的影响.试验结果表明:传感器的主要静态特性,如最大和最小重复性误差分别为3.17%和1.17%,最大和最小非线性误差分别为3.64%和0.83%,灵敏度高达0.586 9 mV/kN.传感器结构简单、工作可靠,能够实现传动轴转速和转矩的在线动态检测. 相似文献
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加载速率是影响裂解质量的重要因素,合理的加载速率可以提高材料的脆性.应用ABAQUS/Explicit动态有限元软件对捷达轿车四缸发动机箱体轴承座(材料HT150)裂解时加载速率对应力、应变的影响进行了模拟分析.确定了裂解时采用6.4 mm/s的加载速率可以达到最佳裂解质量.并且在CSS-88300材料试验机上进行了试验,试验速度:静态、6.4mm/s、8.3 mm/s.根据试验,以速度6.4 mm/s裂解的试件的轴承孔变形量0.06 mm,而其它两件的轴承孔变形量分别为0.29 mm和0.32 mm,这为实际液压系统和裂解设备的楔形推杆设计提供了理论基础. 相似文献
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本文介绍了橡胶减振器在轴系扭振系统中的减振原理及其基本特性参数的测定方法。通过交替加载的静态特性试验,自由衰减振动试验以及动态阻尼特性试验,可以测定橡胶减振器的自振频率,动态刚度、静态刚度,动静比及动态阻尼系数比等基本特性参数,为柴油机扭振计算和橡胶减振器的设计和使用提供了必要的数据资料。 相似文献
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在GT-POWER与Matlab耦合仿真和试验验证的基础上,对电控泵管嘴燃油喷射柴油发电机组在脉冲工况下的动态特性进行了仿真,研究了不同PID控制参数对脉冲工况下柴油机性能的影响,得到了一组理想的控制参数;并提出了首脉冲负载加载前提高柴油机转速的方案,以增大机组轴系在脉冲负载加载前的能量,减小机组在脉冲过程中的动态调速率。仿真结果显示,在理想的PID参数下,机组的动态调速率可由现场试验的6.8%降至4.0%,如果首脉冲负载加载前提前升高柴油机转速,机组的动态调速率可降至2.8%。 相似文献
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可调二级增压柴油机瞬态加载性能的试验 总被引:1,自引:0,他引:1
对柴油机用可调二级增压系统进行了瞬态加载试验研究,建立了可调二级增压系统的柴油机瞬态试验系统,通过全工况范围内的稳态试验进行了可调二级增压旁通阀调节规律分析研究.基于稳态的旁通阀调节规律确定了瞬态加载过程的试验方法,进行了3条转速线上的瞬态定转速加载性能试验.试验结果表明:较低转速高负荷时应关闭涡轮旁通阀来改善燃烧,相应瞬态过程中在低负荷时也应关闭旁通阀来避免增压压力上升缓慢和排放性能差等问题.针对较高转速提出了一种修正调节规律,从而有效地提高了增压系统对柴油机加载过程的响应特性,同时也改善了烟度排放. 相似文献
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汽车动力总成橡胶隔振器弹性特性的有限元分析 总被引:13,自引:0,他引:13
本文以汽车动力总成液阻悬置的橡胶主簧为研究对象,探讨了橡胶隔振器弹性特性的有限元分析方法。文中介绍了橡胶有限元分析的基本理论,论述了建立橡胶超弹性特性本构关系时试验数据的获取方法,并对由不同橡胶本构模型拟合试验数据的结果进行了分析。对一轿车发动机液阻悬置的橡胶主簧在三个垂直方向的力一位移特性进行了有限元分析,并和实测结果进行了对比分析,计算了橡胶主簧的静、动态应力,结果可用于其强度的分析,讨论了橡胶主簧静态弹性特性有限元分析计算结果与单元特性的关系。文中所述的方法也可用于其它橡胶产品的分析。 相似文献
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为了研究真空压力加载方式对泥浆固结效果的影响,通过室内模型试验,分别从土样排水量、平均沉降量、差异沉降量、物理力学性质等方面分析了不同加载方式下4组相同土样的固结效果。结果表明,与常规真空预压加载方式(初始真空压力为-80 kPa)相比,降低初始真空压力(初始真空压力分别取-20、-50 kPa)和分级加载真空预压下的试验箱排水量分别提高了10.6%、6.1%、14.0%,表层土体平均沉降量分别提高了8.02%、5.64%、12.85%,可见采用降低初始压力真空预压和分级加载真空预压处理泥浆时固结效果更好。 相似文献
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为了研究冻融劣化和荷载预损伤对混凝土动态损伤特性的影响,利用10 MN大型多功能液压伺服静动力三轴仪及TR-TSDRSL冻融仪,对历经不同冻融循环后混凝土进行一定幅值的加载历史后,按照不同应变率单调加载直至破坏,并通过Najar能量法对损伤变量D进行了定义,从弹性模量、应变速率和预加载历史三个因素对试件进行损伤分析。试验结果表明,随应变速率的增加,混凝土强度总体呈线性增长,强度增加比例为40%左右,两者拟合后发现预加载历史对混凝土强度的增幅更敏感;随着预加载历史的增大,混凝土强度呈现出先增大后减小的趋势;弹性模量、应变速率和预加载历史三者之间预加载历史的损伤率敏感性更高。随着预加载历史的增大,正式加载时混凝土的压密阶段提前,损伤快速发展阶段提前。 相似文献
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管道厌氧消化器各组成管节的性状和效能呈规律性变化。所能承受的有机质负荷率逐节降低,非解离挥发性脂肪酸的提高可改变消化器的运行性能,消化器对有机质负荷率的波动具有良好的抗性,但所处的有机质负荷率水平不同,抗性各异,去除填料会影响反应器的工作性能。 相似文献
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Hydrostatic thrust bearings are widely applied in rotating machinery field. Its comprehensive performance and safe operation is of great significance for ensuring equipment efficiency. In this paper, the numerical method is adopted to investigate the slit-restricted hydrostatic thrust CO_2 bearing with a small film thickness. The research is carried out from two aspects, which mainly consider the operating conditions and structural parameters. Firstly, the influence of different working fluid types including real air and CO_2(include subcritical and supercritical state) on the static characteristics of bearing is studied, and the results indicate that the bearing with CO_2 as working fluid has a better static performance. Secondly, the influence of rotor rotating speed is studied and the conclusion shows that the rotating speed has a significant effect on bearing static characteristics. Thirdly, the influence of different slit arrangement forms is investigated, and the consequence indicates that the circumferential slits show a better load capacity than that of radial slits, while the flow rate difference is small. Finally, the effect of film thickness on bearing static performance is investigated and the research shows that this factor affects static performance in a dramatical way. When the clearance tends to be smaller, the load capacity increases sharply, while the massflow rate of working fluid decreases. 相似文献
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《International Journal of Hydrogen Energy》2020,45(50):26490-26500
The operating life of the proton exchange membrane fuel cell stack is mainly decided by performances of its weakest single cell because of the “Buckets effect”, thus high voltage uniformity during a dynamic loading process is key to the stack durability. In this work, a 3-kW stack is examined experimentally on its voltage uniformity (voltage coefficient variation (Cv)) under conditions of loading from open-circuit state (0 A) to nominal current (165 A) and stack temperatures of 30 °C, 45 °C and 65 °C. Different dynamic loading strategies, namely constant loading rate strategy, decreasing loading rate strategy, and increasing loading rate (square/cube increasing loading rate) strategy, are examined and compared. Results display that during the loading process, (a) the voltage uniformity rises abruptly and goes down quickly when the loading current is small (e.g. from 0 A to 22 A), (b) the voltage uniformity under a small loading current is better than that under the open-circuit state, and (c) voltage uniformity decreases as the loading current increases from a small value to the nominal current. Comparisons of different current loading strategies show that as the stack temperature rises from 30 °C to 65 °C, the stack Cv value under the open-circuit state increases from 1.12 to 1.84 and decreases from 3.85 to 2.45 in the nominal current state. The maximum Cv for the decreasing loading rate strategy decreases from 16.25 to 9.49 and that of the constant loading rate strategy also decreases from 5.85 to 4.96. Cv values of the square current increasing loading rate strategy keep below 3.85 under conditions of the three stack temperatures and display a slight fluctuation during the whole current loading process, which indicates that the strategy can effectively make the stack being of an excellent voltage uniformity during the instantaneous response process. 相似文献