Reveal the soil dynamic performance under compaction process . set up a dynamic model for the whole system . study the optimal matching problem between the vibratory system and impactive system 用数学手段拟合试验数据，得到土内应力的分布规律和变化规律，揭示了土体在压实过程中的动态特性，并建立了系统的动力学模型。
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Moreover , owing to rapid use of large numbers of nonlinear or impactive loads in power system , many power quality problems will be caused , such as voltage sag , swell , unsymmetry , flicker , fluctuation , harmonic and so on 然而，随着电网中冲击性、非线性负荷的不断增加，导致电网电压波形发生畸变、波动、闪变和三相不平衡等电能质量问题却越来越严重。
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With the development of power electronic technology , much nonlinear , impactive and imbalance load emerges in power system . as a result , power quality has deteriorated . the problem of voltage fluctuation and flicker , one issue of power quality , becomes more and more serious 近年来，依托电力电子技术发展起来的用电负荷日益增多，由于它们非线性、冲击性及不平衡的用电特性，造成诸多电能质量问题，电压波动与闪变就是其中之一。
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4 . the choice reference of medium belt material is came up with : with higher compress intensity , pull intensity and bend fatigue intensity , with middle or low elastic modulus , besides fine heat - resistant , wearable , oil - fast , water - fast anti - impactive capabilities 4 、提出并分析了介质带材料的合理选择原则：压缩强度、拉伸强度和弯曲疲劳强度高和韧性好的中低弹性模量复合材料，此外还需具有良好的耐热、耐油耐水性、耐磨性、抗冲击性、耐候性等。
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In the last , the thesis gives the four model compare test . it include common static roller , vibratory roller impactive roller and composite roller model test . the density and soil stress be measured at same time in the test 最后本文还进行了四种压路机模型的对比试验，静碾压路机模型、振动+静碾压路机模型、冲击+静碾压路机模型和振动+冲击+静碾压路机模型，采用了宏观测量压实度和微观监测土体内应力变化并用的方法，分析比较了各种模型的作业效果和被作用介质应力的变化规律。
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In recent years , current rectifiers , frequency converters , arc furnaces and other power electronic devices etc have been increasingly used in power network . with nonlinear , impactive , unbalanced characteristics , they generate lots of harmonics and cause distortion in power network current or voltage 近年来，配电网中整流器、变频装置、电弧炉以及其它电力电子设备等的应用不断增加，由于这些负荷具有非线性、冲击性和不平衡的用电特性，引起供电网中的电流(电压)畸变，产生大量谐波。
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As technique of power electronics develops , the load with nonlinear , impactive , unbalanced characteristics such as current rectifiers , frequency converters , arc furnaces have been increasingly used in power network in recent years . they generate lots of harmonics and cause distortion in power electrical network current ( voltage ) 随着电力电子技术的发展，近年来电网中象整流器、变频器、电弧炉这样具有非线性、冲击性和不平衡用电特性的负荷不断增加，引起供电网中的电流(电压)畸变，产生大量谐波。
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We equip the following machines for the environmental testing and the reliability test : test box with high and low temperature , test box with high temperature , test box with invariableness temperature and humidity , salt - spray test box , vibrant and impactive test machine , tensile test machine , frequency tester and scanner , oscillograph , oven with invariableness temperature etc . pic the 3d machine 环境试验可靠性测试等方面配置有以下仪器设备：高低温试验箱高温恒温试验箱恒定湿热试验箱盐雾腐蚀箱振动冲击试验台拉力试验机谐振频率f0快速测试仪扬声器f0快速测试仪音频扫频信号发生器示波器电热恒温干燥箱等。
