噪声控制

Electric motor noise is one of the most key parameters for its quality control and fault diagnosis.

电动机的噪声是其质量控制和故障检测的关键参数之一。

Low noise amplifier ; elliptic function bandpass filters ; balanced mixer ; ultra-fine thin-film process ; automatic gain control

低噪声放大器；椭圆函数带通滤波器；平衡混频；超微细薄膜工艺；自动增益控制

To control the exciting winding current and to produce rounded and even inner complex magnet field.

该控制方法能使步进电机低频振荡和噪声有所减轻、高频不失步，并且在运行的过程中细分切换不产生速度突变。

First, a mathematic model for laser diode with a cool is established, which is looked as a first order segment of inertia in theory. It analyzes the step response in the S field and the time field separately after adopting PID control technique, and it also analyzes the equivalent noise model of the amplifying circuit.

首先从理论上对带制冷的半导体激光器组件建立了数学模型，将其看作一阶惯性环节，分别在S域和时域里详细分析了采用PID控制技术后的阶跃响应；同时也对光接收机放大电路等效噪声模型进行分析。

Based on the establishment of mathematical model of flywheel and the analysis of disturbance and noise,the feedback compensation control system is designed.

首先建立了反作用飞轮数学模型，并分析了摩擦力矩干扰和速率测量噪声的特性，在此基础上进行了反馈补偿控制的设计。

In order to make people live healthily, we need to control noise polution .

为了人们健康的生活，我们要控制噪声污染。

The hardware included helicon wave antenna and focusing system.

其中硬件系统主要包括：螺旋波天线和辉光聚焦系统的设计；PCL-818HG数据采集卡输出的+5V稳定信号，经过分压电阻和三极管后，作为数控器的外部启动/停止信号，控制步进电机带动光谱仪转动；另外，为了减小光电倍增管的噪声，单独为其提供了稳定的高压直流电源。

In this paper, characteristics and control theories of intermittence exhaust noise are thoroughly studied.

本文对间歇性排气噪声特性及其控制理论进行了深入的研究。

On this base, also ameliorate assembling manner of each components in STGB by selecting materials, geometry parameter and machining technology. So increase consumedly the quality of joggle gear in STGB, and control effectively noise.

在确定齿轮传动形式的基础上，通过对齿轮的材质优选、几何参数的试验选择以及加工工艺的合理选择，同时通过对启动变速箱内各零部件装配方式的改进，使启动变速箱内齿轮啮合质量得到较大幅度的提高，从而有效地控制了噪声的产生。

In the AC servo control system, using digital low-pass filter can restrain current feedback noise and improve the resolving power of speed feedback, but it may lead to phase lag of feedback signal and directly influence the response speed.

交流伺服控制中采用数字低通滤波可以抑制电流反馈噪声，提高速度反馈分辨率，但同时会带来反馈信号的相位滞后，将直接影响响应速度。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。