查询词典 muffler

Based on a series of signal process and noise source identification techniques, especially the major noise source identification methods, such as expurgation method, sound intensity analysis, spectrum analysis vibro-acoustic correlation analysis and so on, the pass-by noise control of SC7080A and SC6360B are studied in detail. By the roadway and dais experiments, the major noise and radiating parts are identified and some economical controlling methods are made. For the SC7080A, to control the emissing noise from the intake and shell vibration of air cleaner, a intake muffler is installed between the air cleaner and intake valve. Based on the theory of Helmholtz resonator, One three-parallel-connected resonant silencer is designed and trial-manufactured. For the SC6360B, the attenuation performance of exhaust muffler in high frequency region is improved. To reduce the vibration noise of shell part, the structure of oil sump tank, exhaust manifold shield and exhaust manifold shield are analyzed and improved. At the same time, some measures, such as sound absorption, sound insulation, are taken to reduce the noise of engine surface emissivity and a sound shield is designed.

本文首先综述了目前国内外汽车加速噪声控制的现状、主要方法和技术措施，在此基础上，结合SC7080A和SC6350B汽车的车外加速噪声水平及现状，综合运用分别运行法、声强法、频谱分析法、声振相干函数法等现代噪声源识别方法，对SC7080A和SC6360B汽车进行了准确详细的车外加速噪声源识别并提出了经济可行的控制方案，针对SC7080A，主要在空气滤清器和进气阀门之间的进气管道上加装进气消声器，抑制空气滤清器壳体表面和进气口两处的噪声辐射，根据Helmholtz共振腔原理设计了三腔并联旁支型共振消声器，并进行了工程化设计和试制；针对SC6360B，主要改善了排气消声器在高频段的消声性能，对罩壳类零件进行了结构改进，降低了其表面噪声的辐射，并对发动机舱进行了吸声、隔声处理，设计了发动机隔声罩。

Based on the repeated tests, the optimum structure of muffler were defined and the influence of inside pipe structure variation of the muffler on muffling effect were studied.

在大量试验的基础上，研究了二级扩张室式消声器中穿孔管结构的变化对消声器消声效果的影响，并优选出最佳结构的消声器，该消声器消声量大且功率损失小，能满足对内燃机日益严格的噪声要求

My younger brother's apologized to ask me to drink, I seemed to pay no attention to her, and went to comfort him, he telt me she twined a muffler to me, I drunk too much, and felt a little dim slowly, said to him I only wanted to wear the one girl's muffler all my life for the muffler as the bridegroom's clothes.

弟弟歉意地请我喝酒，我似乎不在意她，去安慰他，弟弟跟我说她织好了一条围巾送给我，我喝多了点慢慢地有点迷糊，对弟弟说围巾就像新郎服一样我一辈子只想穿一个女孩子的。

The results of numerical simulation of flow fields of the archetype of exhaust muffler were analyzed and a remodelled exhaust muffler was finalized the design.

依靠传统的实验方法来了解不同的排气消声器的流场特性，既需要耗费大量的人力物力，也需要较长的时间周期。

Series of products: 1, fully automatic production line of Duct flange molding machine, shears, press brake duct and other metal processing equipment. 2, using the entire computer-controlled production lines, specialized in the production mechanism Express rectangle duct flange, Germany duct flange, mechanisms spiral round, flat circular duct, all kinds of bend, the wind pipe fittings. 3, damper, exhaust valves, valve series; 4, muffler, static pressure box, muffler Venetian series; 5, aluminum, teak tuyere, such as stainless steel tuyere tuyere series; 6, Air Shower, Air Shower Channel, clean bench, and efficient delivery of clean air and other series; 7, vertical, horizontal air handling units series; 8, multi-functional modular air handling units series; 9, fan coil series; 10, ventilation, exhaust cabinet series, Fire cabinet centrifugal fan series.

系列产品：1、全自动风管生产线、法兰成型机、剪板机、折弯机等金属风管加工设备。2、采用全电脑控制的生产线，专业生产快速机制法兰矩型风管、德国法兰风管、机制螺旋圆形、扁圆形风管、各类弯头、风管配件。3、防火阀、排烟阀、阀门系列；4、消声器、静压箱、消声百叶系列；5、铝合金、柚木风口、不锈钢风口等风口系列；6、风淋室、风淋通道、洁净工作台、高效送风口等洁净系列；7、立式、卧式空气处理机组系列；8、多功能组合式空气处理机组系列；9、风机盘管系列；10、通风、排气柜系列、消防柜式离心风机系列。

To reduce the noise and dust exhaust port should be installed muffler or muffler throttle.

为减少噪音及防尘排气口应安装消声器或消声节流阀。

High-temperature exhaust muffler as well as the roof fan series muffler, regulating valve, butterfly valve, exhaust valve, positive pressure to send air, fire dampers, smoke mouth plate, fire protection, thermal insulation hose.

消声高温排烟以及屋顶风机系列消声器、调节阀、蝶阀、排烟阀、正压送风口、防火阀、板式排烟口、防火、保温软管。

According to "air conditioning", muffler elbow, silencer muffler static pressure box belong to one ...

根据《空气调节》，消声弯头，消声静压箱均属于消声器的一种。。。。

The results show the glass fibers can significantly improve muffler performance, and the changes of glass fiber's diameter and density have noticeable influences on muffler performance.

结果表明，加入玻璃纤维可以显著改善消声器的消声性能，玻璃纤维的直径和密度对消声器的消声性能也有明显的影响。

Using fluid dynamics FEM (two dimensional, three dimensional andaxisymmetric) and three dimensional acoustic FEM in meticulous analysis ofexpansion muffler structure, this paper studies the influences of each mufflercomponents' position, dimension, form and quantity on the fluid dynamic andacoustic performances;therefore the paper indicates that the end of the intruding tubeis the linchpin of the fluid dynamic performance of the whole muffler structure, thespringhead of muffler fluid dynamic performance is the smoothness of air current, themain factor which affects the acoustic attenuation value of expansion chamber muffleris the grade of saltation of the section of air conducting access, and the attenuationvalue of specific frequency can be dramatically enhanced by carefully designing thelength of expansion chamber.

本文通过流体力学有限元方法和三维声学有限元方法对扩张腔消声结构的参数化模型进行了细致的分析，研究了这种结构的各个组成部份的位置、大小、形状和数量对其流体力学与声学性能的影响，指出插入管端口是影响整个结构流体力学性能的关键，消声结构流体力学性能的根源是气流通过时的平稳程度；影响扩张腔消声量的主要因素为声波传播通路截面突变的程度，并可以通过精细的设计扩张腔轴向长度获得宽频或指定频率消声量的大幅度提高。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。