噪声控制

The Chinese Standard Compressing Garbage Truck was firstly developed and manufactured in the beginning of 2001. Now, we have 5 grades and 8 categories of rear-loading compressing garbage truck which was modified from the chassis with loading capacity of 3T～15T. The truck frame was made of high strength steel and is controlled by advanced PLC programmable controller. It is of reasonable structure, simple operation, safety and reliability, low noise and low fuel consumption. Basically, it has no secondary pollution, and awarded many patents. The primary technological performance of the truck is at the advanced level compared to similar domestic products. The series provide various loading methods, suitable for the collection and transportation of barrel-packing, bag-packing and no-packing living garbage in urban residential areas.

h， C _9 d# U' e4 O 中标牌压缩式垃圾车系列产品自2001年初开始研制、生产，目前已拥有采用装载量3T～15T的汽车二类底盘改装的五个级别八个品种的后装压缩式垃圾车，整车采用高强度钢制作和先进的PLC可编程序控制器控制，具有结构合理、操作简便、安全可靠、噪声低、油耗少的特点，基本杜绝了二次污染，并拥有多项专利，其整车的主要技术性能处于国内同类产品先进水平，该车系可提供多种上料方式，适用于城镇居民桶装、袋装和散装生活垃圾的收运。

Noise control ; hot-dip galvanization ; steel tube ; blowing tube

热镀锌；钢管；吹管噪声；控制措施

The control of an electromagnetic valve in the ABN brake chamber forces the spring to vibrate at a frequency of 18 times per second while braking, and also with certain natural frequency reciprocating motion.

利用停易ABN制动气室弹簧的振动及电控装置控制电磁阀激振，迫使气室弹簧在整个制动过程中不但以每秒18次的自振频率振动，同时又以一定的固有频率往复运动，利用弹簧的储能作用，将刹车时产生的声能和热能用弹簧的势能和动能来置换，从而达到降低制动噪声、温度和磨损的目的。

Accordingly, the control of industrial noise pollution should cause our deep-felt attention.

因此，工业噪声污染的控制应引起我们深切的关注。

Article 41 The Contractor shall take actions to control and handle environmental pollution or hazard caused by dust, exhaust gas, waste water, solid waste, noise or vibration, in compliance with applicable legislations and regulations of environmental protection and safety production.

第四十一条建筑施工企业应当遵守有关环境保护和安全生产的法律、法规的规定，采取控制和处理施工现场的各种粉尘、废气、废水、固体废物以及噪声、振动对环境的污染和危害的措施。

The main parameters for the reception path is a very low noise figure (2dB typical including the duplexer and the limiter losses), the amplitude/phase control with a very high accuracy.

接收支路的主要参数是很低的噪声系数(典型值是2dB，包括收发开关和限幅器损耗)，以及很高精度的幅相控制。

After all, an OAA style experimental set-up in a single expansion chamber silencer for engine exhaust noise control was developed. Three kinds of software for the AANC system, the AANC system combined with the ALE, and the AANC system combined with the proportional tuned PDC were programmed.

结果表明：该系统在部分消除了影响次级通道建模精度的宽带干扰噪声的同时，充分发挥了前向窄带控制系统的作用，提高了次级通道建模精度，系统稳定性及消声性能得到提高。

The theoretical foundation for further research is established. In chapter 6, the flow field of poppet valve and spool valve which are two kinds valve frequently used in hydraulic technique are predicated by finite element method. The flow field structure at different valve opening are illustrated by visualizing images. The effect on the flow noise and energy loss probably caused by vortexes is analyzed quantitatively, the flow channel of the valve is improved.

第六章用有限元方法对液压传动与控制中最常见的两种结构形式的液压阀—液压滑阀和液压锥阀流场进行数值预报，给出不同开口度和不同结构尺寸下流场结构的可视化图像，定性分析涡旋的产生对流体噪声及能量损失可能产生的影响，并对阀的流道结构进行改进。

Results:Eleven subjects were recruited in each group according to the affected factors (head motion,behavioral performance and machine noise) were ruled out.

结果：在严格控制被试头动、行为学表现及机械噪声等因素影响后，最终符合实验要求的被试为脑梗死运动性失语患者和正常人各11例，均为男性。

Phase unwrapping algorithm based on edge detection is suitable to well separated fringes, the unwrapped phase can be rewrapped to the original phase map, which shows the result is correct.

4对于低噪声情况下或滤波后的干涉条纹图，在基于边缘检测的相位解缠过程中，利用Snake模型可以高效准确的实现边缘点的连接，所连接的边缘线与干涉条纹很好的吻合，可将连线的精度控制在三个像元。

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。