By taking a rolling-spring isolation system as the study object, the effects of the non-uniform distribution of rolling friction coefficient on its isolation performance were analyzed by a compiled computer program. T...By taking a rolling-spring isolation system as the study object, the effects of the non-uniform distribution of rolling friction coefficient on its isolation performance were analyzed by a compiled computer program. The results show that the errors associated with the structural maximum relative displacement, acceleration and residual displacement due to ignoring the friction variability sequentially grow. This rule is weakened by the spring action, however, the unreasonable spring constant will cause sympathetic vibration. Under the condition of large friction variability, in the calculation of the structural maximum relative displacement and acceleration, the friction variability should be considered. When the structural residual displacement is concerned, the variability of rolling friction coefficient should be fully considered regardless of the friction variability.展开更多
对板壳支承结构提出了阻振质量、框式改进和弹性隔振3种减振措施,开展减振方案设计,并建立改进支承结构与原支承结构数值模型,以泵类设备振动激励作为输入,分析振动从支承结构向外壳的传递特性,采用数值方法研究3种改进设计方案的减振...对板壳支承结构提出了阻振质量、框式改进和弹性隔振3种减振措施,开展减振方案设计,并建立改进支承结构与原支承结构数值模型,以泵类设备振动激励作为输入,分析振动从支承结构向外壳的传递特性,采用数值方法研究3种改进设计方案的减振效果。结果表明,3种减振措施对泵类设备振动通过支承结构向外壳传递的衰减效果分别最高可达3、10、40 d B,考虑工程特性参数和质量比一定时,阻振质量工程适应性最强,但减振效果有限,弹性隔振效果显著,但工程使用难度较大,框式支承则兼顾了减振效果和工程参数影响,具有较强工程应用前景。展开更多
基金Projects(51308549,51378504,51478475) supported by the National Natural Science Foundation of ChinaProject(2015JJ3159) supported by the Natural Science Foundation of Hunan Province,ChinaProject(2015CX006) supported by the Innovation-driven Plan in Central South University,China
文摘By taking a rolling-spring isolation system as the study object, the effects of the non-uniform distribution of rolling friction coefficient on its isolation performance were analyzed by a compiled computer program. The results show that the errors associated with the structural maximum relative displacement, acceleration and residual displacement due to ignoring the friction variability sequentially grow. This rule is weakened by the spring action, however, the unreasonable spring constant will cause sympathetic vibration. Under the condition of large friction variability, in the calculation of the structural maximum relative displacement and acceleration, the friction variability should be considered. When the structural residual displacement is concerned, the variability of rolling friction coefficient should be fully considered regardless of the friction variability.
文摘对板壳支承结构提出了阻振质量、框式改进和弹性隔振3种减振措施,开展减振方案设计,并建立改进支承结构与原支承结构数值模型,以泵类设备振动激励作为输入,分析振动从支承结构向外壳的传递特性,采用数值方法研究3种改进设计方案的减振效果。结果表明,3种减振措施对泵类设备振动通过支承结构向外壳传递的衰减效果分别最高可达3、10、40 d B,考虑工程特性参数和质量比一定时,阻振质量工程适应性最强,但减振效果有限,弹性隔振效果显著,但工程使用难度较大,框式支承则兼顾了减振效果和工程参数影响,具有较强工程应用前景。