通风机

In the first session the fans vibration on-line monitoring system is realized with VC language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis.

首先用稳定性强、扩展性好的VC++语言开发了通风机振动在线监测系统，并编写了自功率谱密度函数、互功率谱密度函数、自相关函数和互相关函数等频谱分析函数来进行简单的离线故障诊断。

The internal relation between a large number of existing aerodynamic sketches and performance parameters of centrifugal fan is analyzed and investigated by means of statistical method,the correspondence relation between speed coefficient and diametral quotient,impeller outlet breadth and diametral quotient is found.

应用统计的方法对大量已有离心通风机的空气动力学略图和性能参数之间的内在关系进行分析研究，发现了速度系数σ与直径系数δ之间以及叶片出口宽度b2与直径系数δ之间存在着对应关系，利用这些关系提出了确定风机叶轮主要参数的新方法。

Fanner ; Performance test ; Automation ; Data collection ; Data processing

通风机；性能测试；自动化；数据采集；数据处理

To satisfy the requirement that fan industry fosters to the talent, my school holds class of attend in a advanced studies of fanner design......

为满足风机行业对人才培养的需求，我校特举办通风机设计、。。。。。。

Using the monitor data, the system also can draws performance's curve of fanner and print report forms of testing data under demands of users.

在监测的基础上，还可以根据需要绘制出通风机的性能曲线和打印测试数据报表。

Is a professional design, production and sale of fire civil construction and industrial and mining enterprises, ventilation and refrigeration equipment in science and technology backbone enterprises.

上虞通风机有限公司是一家专业设计，生产，销售民用建筑和工矿企业消防，通风，制冷设备的科技骨干企业。

The dynamic character of a pipe system is measured by hot wire and pressure sensor system.

本文的实验工作针对叶轮机械进出口的动态响应特性，采用热线风速仪和压力传感器同时测量了一管道和高压通风机内流动参数的响应。

A fault diagnosis based on wavelet and PNN was introduced, which firstly uses Mexican Hat wavelet to transform diagnosis signal and extract energy normalized vector, then uses PNN to output fault as a classifier.

针对煤矿主通风机故障与征兆对应关系复杂的特点，以及利用传统BP网络进行故障诊断存在训练速度慢、易陷入局部极小的缺点，提出基于小波和概率神经网络的故障诊断方法：先利用时频两域有紧支撑能力的MexicanHat小波变换故障信号并提取能量归一化故障特征向量；然后将概率神经网络作为诊断决策分类器，输出故障模式。

The first step of simulation method is to establish the one-dimension parabolic partial differential advection diffusion equation that was used to describe the mass transportation model of air-pollution distribution as a block program model of the controllable plant. Then, applying the Fuzzy logic theory to operate tunnel jet-fans and control the tunnel wind quantity and adjust the wind average velocity would not let the air-pollution concentration over the standard safety value too much.

模拟方式首先将常被用以表示隧道内空气污染物质传理论模式之一维向平流扩散抛物线型偏微分方程式建构成一组可控制对象的方块程式模拟模型，再运用模糊逻辑理论模拟控制喷流式通风机之运转风量来调节隧道内平均风速以控制隧道内空气污染物浓度不至於高过标准安全值太多。

This paper introduces the principles of sound intensity method and the application of the method to measure the noise of the fan.

该文介绍了声强法的原理和通风机噪声的声强测量方法，有一定实际应用价值。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。