pi

英 [paɪ]

美 [paɪ]

n.  圆周率; 希腊字母表的第16个字母

复数：pis　

计算机

BNC.8364 / COCA.18727

牛津词典

noun

• 圆周率
  the symbol π used to show the ratio of the circumference of (= distance around) a circle to its diameter (= distance across), that is about 3.14159
• 希腊字母表的第16个字母
  the 16th letter of the Greek alphabet (Π, π)

柯林斯词典

• 圆周率（通常用希腊字母�表示，近似值为3.142）
  Piis a number, approximately 3.142, which is equal to the distance round a circle divided by its width. It is usually represented by the Greek letter �.

英英释义

noun

• the 16th letter of the Greek alphabet
• the ratio of the circumference to the diameter of a circle

双语例句

• Research of fuzzy PI control of dual-motors driving servo system
  双电机驱动伺服系统的模糊PI控制研究
• The controller consisted of a PI feedback controller and a self-adaptive DRNN feed-forward controller.
  反馈控制器以目标转速与实际转速的误差为输入量，采用PI控制来提高控制系统的稳定性。
• The output voltage of converter is stabilized at the reference value by PI close-loop control.
  通过PI闭环控制，将变流器输出电压实时稳定于基准值。
• Predictive voltage feedback PI controller with feedforward voltage compensator is adopted as the controlled method of the inverter system.
  针对在光伏并网系统中采用单纯PI控制的缺点，提出了增加电网电压前馈控制来改善并网电流波形。
• PI controller is widely used in wind turbine control system and its parameters need to be identified.
  风电机组控制系统中PI控制器较多，需要辨识各PI控制器的参数。
• Fuzzy PI Control Strategies of Networked Control System
  网络控制系统的模糊PI控制方法
• An integral item of error was added to the PI regulative law to restrain interference effectively.
  在PI调节律中引入了对误差的积分项以更好地抑制外部扰动；
• In our self-Oscillation drive system, the stable error of the oscillation amplitude is eliminated by the PI controller.
  在该闭环驱动系统中，通过引入PI控制器消除了振动幅度控制的稳态误差。
• We want to discuss sigma bonds and pi bonds.
  我们要讨论sigma键和π键。
• Simulation results show it is better than classic PI optimal controller.
  仿真结果表明，它也优于经典离散PI最优调节器。