A set of laminar flow predictions are presented to demonstrate the effects of the Reynolds number, helix angle(α), the number of stars(Ns) on the velocity circulation, the Nusselt number, the emendatory Nusselt number and the friction factor.
698),通过数值模拟的方法在Re=600-2000的范围内对内螺纹肋管内周期性充分发展的层流流动进行了模拟分析,说明了不同Re、螺纹肋的旋转角度α、螺纹肋的牙数N8对速度环量、Nu、Nu和阻力系数的影响,并通过对Nu和速度环量之间的关系进行了分析,得出在内螺纹肋管内强化换热流动中决定换热强度的物理量一速度环量。
A set of laminar flow predictions are presented to demonstrate the effects of the Reynolds number, twisted-ratio, tape thickness and the fin-parameter on the Nusselt number, velocity circulation and the friction factor.
以空气为介质 (Pr=0 6 98) ,通过数值模拟的方法在Re=30 0～ 80 0的范围内对含扭曲带管内周期性充分发展的层流流动进行了模拟分析 ,说明了不同Re、扭曲比y、纽带厚度δ和翅片系数Cfin对Nu、速度环量和阻力系数的影响 ,并通过对Nu和速度环量之间的关系进行了分析 ,得出在含扭曲带管内强化换热流动中决定换热能力的物理量———速度环量 。
The flow field, vorticity field, velocity circulation, Nusselt number and the horse shoe vortices in the fin-and-flat tube bank heat exchanger have been investigated by numerical analysis.
本文通过数值模拟的方法对扁管管片式散热器中的流场、涡量场、速度环量、 Nu数、马蹄形涡进行了模拟。
Then a vector control method with speed closed-loop and magnetic linkage closed loops put forward, which is based on the constant velocity by means of stator flux-oriented vector control.
在基于定子磁场定向的矢量控制恒线速运行控制方案的基础上,提出了一个速度闭环、磁链闭环的矢量控制方案。
Study of linear motor speed loop based on model reference adaptive sliding model control;
基于模型参考自适应滑模控制的直线电机速度环研究
motor phase-locked system, in which the external loop is the frequency and phase discriminating loop, where as the internal loop is the speed loop.
为了获得较好的动特性和较高的稳态精度，在直流电动机销相系统中可采用数字模拟混合系统方案，即采用双环结构，外环是鉴频鉴相环，内环是速度环。
According to design of speed loop for PMSM servo system,this paper analyzes the shortage of traditional PI adjustor.
针对永磁交流伺服系统中速度环的设计,分析了采用传统PI调节器的不足之处,进而引出变结构思想以提高伺服系统的快速响应能力。
How to use it in a servo system,especially how to select the arithmetic and the parameters of the velocity loop,the hardware and the software are discussed.
具体选用Kollmorgen公司的ServostarS/C系列,该伺服控制器是当前性能指标较为优异的电机控制器,如何在伺服系统中使用,尤其是速度环的算法选取、参数选取及相关软硬件设计,进行了详细的讨论。
This article presents a design of permanent magnetic brushless DC motor control system and mainly involves the hardware circuit design of speed closed loop and power module drive.
介绍了一种永磁无刷直流电机控制系统的设计方案,主要涉及速度闭环和功率模块驱动的硬件电路设计;并通过实验证明该设计可直接用于小型无刷直流电机的控制。
Speed Closed Loop Controller of 270 V High Voltage Brushless DC Motor
270V高压无刷直流电动机速度闭环控制器
Closed-loop speed control of hybrid step motor using the harmonic back EMF
利用谐波反电势实现混合式步进电动机速度闭环控制
Research and Design of the Speed Feedback Control System of Linear Motor Pumping Unit;
直线电机抽油机速度闭环控制系统的研究与设计
Design and Implementation of Speed Closed-loop Control of Brushless DC Motor Based on FPGA
基于FPGA的无刷直流电动机速度闭环系统设计与实现
A Research on Interface Circuits of Closed-Acceleromenter;
闭环电容式微加速度计接口ASIC研究
Design of ΣΔ-Modudulation ASIC Circuit for Closed-Loop Micro-Accelerometer
闭环微加速度计ΣΔ调制ASIC电路的设计
System Analysis and Optimization of the Closed-Loop Microaccelerometer
闭环微加速度计系统性能分析与优化
Design on Low-Power Closed-Loop Accelerometer Interface ASIC
低功耗闭环加速度计接口ASIC设计
CMOS interface circuit for closed-loop accelerometer
闭环加速度计CMOS接口电路(英文)
A Designing Research on Speed-Regulating System of Double Closed-Loops;
速度和电流双闭环直流调速系统的设计新探
A Closed-loop Control System of Hydraulic Press with Variable BHF and Pressing Velocity
压边力和冲压速度可调的液压机闭环控制系统
Asic Interface Circuit Design for High Dynamic Range of Closed-Loop Micro-Accelerometer
高动态范围闭环微加速度计接口ASIC电路设计
Design on Full Defferential Interface Circuit for Closed-Loop Micro-Acceleromenter
闭环微加速度计接口全差分ASIC电路的设计
Differential capacitance detection circuit for digital closed-loop accelerometer
用于数字闭环加速度计的差动电容检测电路
The Research of Micro-capacitive Accelerometer's Control Technique
微电容式加速度计的闭环控制技术研究
Research of Silicon Micro-capacitive Accelerometer's Closed Loop Control Technique
硅微电容式加速度计的闭环控制技术研究
Proceed from the actual situation, the accuracy and stability gurantee measures of speed signal in closed loop vector control were put forward.
介绍了闭环矢量控制中速度信号的精确和稳定的必要措施。
Close-Loop Control for Speed Feedback of Linear Stepping Electric Motor Based on DSP Control;
基于DSP控制下的直线步进电机的速度反馈闭环控制