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
• In the process of rotor speed identification, the variable parameters PI mechanism, which has good dynamic and static performance and robustness are used.
  在转速辨识过程中，应用了具有较好动态性能和鲁棒性的变参数PI算法。
• The inner loop adopts PI algorithm and the outer loop adopts a time optimal self-tuning PID algorithm.
  伺服控制器分别采用有源PI校正和时间最小参数自调整PID控制算法。
• Research of Hybrid Excitation Claw Alternator Control System Based on Fuzzy Self-adaptive PI
  基于模糊自适应PI的混合励磁爪极发电机控制系统研究
• The design of nonlinear PID and PI attitude-controller for a flexible spacecraft
  挠性航天器的非线性PID和PI姿态控制器设计
• The test results show that it has better performance both in dynamic and steady state than traditional PI control.
  此方法计算量小，实验证明获得了较传统PI控制更好的动静态性能。
• 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。
• In the corporate brand building, Product Identity ( PI) strategy is very important.
  在企业的品牌建设中，产品形象识别（PI）策略是非常重要的。
• 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；
• Net Search Extender supports comment nodes ( example 3 in Listing 30) and processing-instruction ( PI) modes.
  NetSearchExtender支持评论节点（清单30中的示例3）和处理指令（PI）节点。