Laptop personal computers(LPCs) and their components are vulnerable devices in harsh mechanical environments. One of the most sensitive components of LPCs is hard disk drive(HDD) which needs to be protected against da...Laptop personal computers(LPCs) and their components are vulnerable devices in harsh mechanical environments. One of the most sensitive components of LPCs is hard disk drive(HDD) which needs to be protected against damages attributable to shock and vibration in order to have better magnetic read/write performance. In the present work, a LPC and its HDD are modeled as two degrees of freedom system and the nonlinear optimization method is employed to perform a passive control through minimizing peak of HDD absolute acceleration caused by a base shock excitation. The presented shock excitation is considered as half-sine pulse of acceleration. In addition, eleven inequality constraints are defined based on geometrical limitations and allowable intervals of lumped modal parameters. The target of the optimization is to reach optimum modal parameters of rubber mounts and rubber feet as design variables and subsequently propose new characteristics of rubber mounts and rubber feet to be manufactured for the HDD protection against shock excitation. The genetic algorithm and the modified constrained steepest descent algorithm are employed in order to solve the nonlinear optimization problem for three widely-used commercial cases of HDD. Finally, the results of both optimization methods are compared to make sure about their accuracy.展开更多
随着硬盘的磁密度越来越高,数据存取速度越来越快,要求硬盘的驱动速度更快,寻道精度更高。在这种苛刻的工作条件下,即使是微小的机械振动也会产生数据的读写错误。为了提高其动态响应特性,重点研究采用基于动态柔度的拓扑方法进行硬盘...随着硬盘的磁密度越来越高,数据存取速度越来越快,要求硬盘的驱动速度更快,寻道精度更高。在这种苛刻的工作条件下,即使是微小的机械振动也会产生数据的读写错误。为了提高其动态响应特性,重点研究采用基于动态柔度的拓扑方法进行硬盘驱动臂的拓扑形态设计,包括硬盘驱动臂拓扑设计的建模、灵敏度分析、拓扑优化的过程以及对优化结果的分析。通过研究,得到几种新的硬盘驱动臂的结构拓扑形态,发现它们与静态拓扑和基于频率的拓扑设计结果具有一定的局部相似性,这表明基于动态响应的拓扑设计具有更好的综合性能。文中提出的方法为进一步改善HDD(hard disk drive)驱动臂的动态性能提供一种新的途径。展开更多
文摘Laptop personal computers(LPCs) and their components are vulnerable devices in harsh mechanical environments. One of the most sensitive components of LPCs is hard disk drive(HDD) which needs to be protected against damages attributable to shock and vibration in order to have better magnetic read/write performance. In the present work, a LPC and its HDD are modeled as two degrees of freedom system and the nonlinear optimization method is employed to perform a passive control through minimizing peak of HDD absolute acceleration caused by a base shock excitation. The presented shock excitation is considered as half-sine pulse of acceleration. In addition, eleven inequality constraints are defined based on geometrical limitations and allowable intervals of lumped modal parameters. The target of the optimization is to reach optimum modal parameters of rubber mounts and rubber feet as design variables and subsequently propose new characteristics of rubber mounts and rubber feet to be manufactured for the HDD protection against shock excitation. The genetic algorithm and the modified constrained steepest descent algorithm are employed in order to solve the nonlinear optimization problem for three widely-used commercial cases of HDD. Finally, the results of both optimization methods are compared to make sure about their accuracy.
文摘随着硬盘的磁密度越来越高,数据存取速度越来越快,要求硬盘的驱动速度更快,寻道精度更高。在这种苛刻的工作条件下,即使是微小的机械振动也会产生数据的读写错误。为了提高其动态响应特性,重点研究采用基于动态柔度的拓扑方法进行硬盘驱动臂的拓扑形态设计,包括硬盘驱动臂拓扑设计的建模、灵敏度分析、拓扑优化的过程以及对优化结果的分析。通过研究,得到几种新的硬盘驱动臂的结构拓扑形态,发现它们与静态拓扑和基于频率的拓扑设计结果具有一定的局部相似性,这表明基于动态响应的拓扑设计具有更好的综合性能。文中提出的方法为进一步改善HDD(hard disk drive)驱动臂的动态性能提供一种新的途径。
