缩短水射流实验调压时间的改进方法

人工调节泵压时间长,导致现有水射流实验时效低。分析发现人工调阀稳定性差、操作与信息不同步是导致终压段调压时间过长的主要原因,为此设计研制了机械手,通过与电动机匹配进行控制调阀,并将调阀控制与数据信息进行集成,实现了对高压水射流泵压的远程控制和精细调节。经测试,该装置使单套实验平均调压时间下降55%,节省电量28.5 kW·h,节省水量2.05 m^(3)。该装置的运用提高了泵压调节的控制精度,降低了人员劳动强度、实验周期和成本,具有较好的社会效益和经济效益。同时整套装置结构简单、成本投入低、可靠性强,能有效解决人工调阀的不方便与不安全,具有一定的推广价值。

Synthesis Scheme for Low Power Designs Under Timing Constraints

To minimize the power consumption with resources operating at multiple voltages a time-constrained algorithm is presented.The input to the scheme is an unscheduled data flow graph (DFG),and timing or resource constraints.Partitioning is considered with scheduling in the proposed algorithm as multiple voltage design can lead to an increase in interconnection complexity at layout level.That is,in the proposed algorithm power consumption is first reduced by the scheduling step,and then the partitioning step takes over to decrease the interconnection complexity.The time-constrained algorithm has time complexity of O(n 2),where n is the number of nodes in the DFG.Experiments with a number of DSP benchmarks show that the proposed algorithm achieves the power reduction under timing constraints by an average of 46 5%.