查询词典 pi

Permanent Magnet Synchronous Motor has the feature of strong nonlinear, coupling and parameter time-varying. The Proportional and integral part of traditional PI controller is fixed and unable to meet high precision requirements of PMSM speed control.

永磁同步电机是具有强非线性、强耦合和参数时变特性的被控对象，传统PI 控制方法作为一种线性控制其比例、积分环节的参数固定不变，不能满足永磁同步电机对高精度的要求。

The detailed steady state process of OCC APF with both resistive load and nonlinear load is analyzed,based on which the physical meaning and steady condition of proportional part and integral part in PI controller are given.

在此基础上给出了 PI调节器中P和I环节的物理意义及其应满足的条件，发现可将其作用分开：I环节主导Um长期内较大的变动，用来反映负载大小的改变；P环节每个工频周期内对Um小范围调整，用来平衡每个工频周期内负载存在的谐波。

Then we study the simulation software PSAT, based on that take the second exploit towards the software and on the basis of MATLAB/SIMULINK we establish the intangible control drivers model then put it into the PSAT, comparing to the former PI control model, it increases the emulational precision.

对仿真软件PSAT进行了研究，在其基础上对软件进行了2次开发，在MATLAB／SIMULINK平台上建立了模糊控制的驾驶员模型，将其导入PSAT，相比原来的PI控制模型提高了仿真精度。

Sometime soon, I will start assigning ranges for calculating the quadrillionth (10^15th) bit of Pi.

很快我将开始分配对Pi的第10^15比特位的计算任务。

September 6, 1998- PiHex begins calculations of the quadrillionth bit of pi.

1998年九月6日- PiHex 开始 pi 的千万亿分之一位的计算。

The trial demonstrated that PI-88 increased time to tumour recurrence by 76%.

试验表明PI-88使肿瘤复发时间延长了76%。

ConclusionPressure force modulates the cell cycle time and the PI of fibroblast cells in fibrous tissues restrainedly, which may be one of the possible cytobiological principles of that dredging the channels and eliminating stagnation submitted by massage therapy.

结论压力刺激对筋膜组织成纤维细胞周期与PI的抑制性调节，可能是推拿"舒筋散结"的细胞生物力学原理之一。

Due to the large torque ripple of direct torque control in low speed range,a torque angle adjustor based on fuzzy neural network and PI control was adopted to improve the control effect.

针对直接转矩控制低速时转矩脉动大的问题，采用基于模糊网络与PI控制结合的转矩角调节器来改进控制效果。

This paper propounds an improved kinetic model of monthly potential evapotranspiration ETi:ETi=where i is a number of month, Pi the monthly mean atmospheric pressure,ti the monthly mean air temperature, di the number of days in a month,Ui the monthly mean wind velocity measured at height 10-12m, woi the saturated water vapour pressure at ti,and hi the monthly mean relative humidity.

本文提出了关于月可能蒸散量ETi动力学模型的改进形式：式中，i是月份的编号，Pi是月平均气压，ti是月平均气温，di是月的天数，Ui是在10─12m高度处观测的月平均风速，woi是在温度为ti时的饱和水汽压，而hi是月平均相对湿度。

In this paper, based on theoretical research of the method of Scanning Parameters Optimization, a new DSP-based SPM controller with self-adjusting PI parameters is developed.

针对SPM存在的以上缺点，本文在研究扫描参数优化算法的基础上，设计了一种基于高性能DSP的新型PI参数自整定SPM控制器。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。