For certain workloads cache hit ratio is lower than would justify having it enabled 在一定的负载压力下,如果缓存命中率太低了,就启用它。
If chaos or network theories are right , a chance of large cascading failures is inherent to stressed or highly interconnected systems 如果混沌或网络理论是正确的,在负载压力大或高度联结的系统里,大规模连锁跳电的机率总是存在的。
The improvement system is made up of the pressure sensor , flow sensor , displacement sensor , electro - hydraulic proportional flow control valve , power amplifier , data gathering board and computer . the platform can carry out testing the hydraulic parameters , processing the tested data , saving the processed data and drawing , adjusting the pressure automatically 改造后的测控系统主要由压力传感器、流量传感器、位移传感器、比例节流阀、功率放大器、数据采集卡和计算机组成。改造后的实验台具有自动采集实验数据、自动处理实验数据、自动保存实验数据、自动调节液压系统负载压力等功能,大大提高了实验台的工作效率、测试精度和智能化水平。
The key items include the car sinking , constant speed characteristics , inspection function , auto relevelling function and level accuracy , etc . the research contents focus on the following three parts : firstly , research on effects of system parameters on car sinking has been completed . secondly , the constant speed performance with the compensation of internal leakage of pump / motor is improved . lastly , research on improvement of the car level accuracy and contrast to that of traction elevators is presented , and the reasons of low car level accuracy of hydraulic elevators are discussed 重点研究了三方面内容:一是研究了停层沉降特性及影响电梯轿厢停层沉降特性的各种因素;其次是通过负载压力补偿液压泵马达内泄漏来改善电梯轿厢速度稳定性;最后是液压电梯平层精度的理论和实验研究,并与曳引电梯的理论模型进行了对比,阐述了液压电梯平层精度低的原因,理论探讨了影响液压电梯平层精度的主要因素。
That is , through analysis of the principle on flow control and " hydraulic transistor " , design and calculation of flow control characteristic as well as main parts in valve inner chamber , a piloted reducing valve will be installed between main valve and pilot valve . after a pressure - difference compensating reducing valve was added in the non - pressure compensating piloted reducing valve of the flow control valve in vlalvistor valve , the calculation on control characteristic emulation and load characteristic emulation has been carried out . the result of the calculation shows that after pressure compensating reducing valve was added , the linearity of the control characteristics has been greatly improved thus eliminating influence upon outlet flow by load pressure - change of the hydraulic system and improving performance characteristics of the hydraulic component 文章还在对瑞典valvistor阀的插装比例阀研究的基础上,提出了一种新的流量控制原理,即:通过对流量控制和“液压晶体管”原理的分析、流量控制特性及阀内腔主要结构件的设计计算,在主阀和导阀之间增设先导减压阀,并进一步对valvistor阀的流量控制阀之无压力补偿先导减压阀、加入压差补偿减压阀后的控制特性进行了仿真计算和负载特性仿真计算,结果表明:增设压力补偿先导增压阀后,其控制特性曲线变得非常线性,从而消除了液压系统负载压力变化对主阀输出流量的影响。