Chapter six, in consideration that the worm tongue structure is a key factor affecting noise generation, the mathematical model of centrifugal fan noise increment that is produced by worm tongue structure is established by using of the D—optimizng technology and dimension analysis method, and the spectral property of fan noise produced by worm tongue structure is analysed.

第六章，針對(duì)離心風(fēng)機(jī)蝸舌是影響離心風(fēng)機(jī)噪聲的關(guān)鍵因素的特點(diǎn)久久久精品一二三区，采用D—最優(yōu)化技術(shù)并結(jié)合量綱分析法免费黄一区，建立了離心風(fēng)機(jī)蝸舌引起的噪聲增量與蝸舌結(jié)構(gòu)參數(shù)的數(shù)學(xué)模型，并分析了蝸舌結(jié)構(gòu)參數(shù)及其對(duì)葉輪聲輻射頻譜特性的影響18岁禁止黄片。

This fan combines centrifugal fan of whole by squirrel-cage asynchronous electric machinery and aluminium alloy impeller, spiral case.

該風(fēng)機(jī)由鼠籠式異步電機(jī)與鋁合金葉輪1313午夜精品福利片、蝸殼組合成全體的離心風(fēng)機(jī)。

The problem is mainly caused by primary air pipe resistance property variation,which caused the excessive opening of movable blades,the primary fan is working on the condition of higher wind pressure and lower flow.The approaches to reduce the speed stalling of primary fan and preventive measures are put forwa...

主要原因?yàn)橐淮物L(fēng)管阻力特性的變化97国产男人的天堂在线视频，使一次風(fēng)機(jī)動(dòng)葉開(kāi)度過(guò)大亚洲一级aⅴ无码毛片中文国产，一次風(fēng)機(jī)工作點(diǎn)處在高風(fēng)壓區(qū)低流量的工況點(diǎn)，是造成一次風(fēng)機(jī)失速的主要原因久操B，提出了運(yùn)行中減少一次風(fēng)機(jī)失速機(jī)率的處理方法及預(yù)防措施中国产XXXXA片免费视频软件。

An optical method of rotating fan blade shape and deformation measurement is proposed, which was based on Fourier transform profilometry and stroboscopic effect, and than is verified by experiment on a domestic electric fan.

提出了一種利用頻閃光作為結(jié)構(gòu)照明光源，基于傅里葉變換輪廓術(shù)對(duì)旋轉(zhuǎn)葉片每個(gè)時(shí)刻的三維面形和變形量進(jìn)行動(dòng)態(tài)測(cè)量的光學(xué)方法国产JIZZ在线观看。

As the lake basin shoals and silts up, the color of clastic sediment gradually changes from black, black gray, gray and grayish green to purplish grey and red purple, meaning that the subaerial alluvial fan deposit of late stage has replaced the fan-delta deposit and that the coal-forming process ends.

待湖盆逐漸變淺和淤積熟妇精品视频，碎屑沉積物的顏色由黑、黑灰人人操五月肥妇、灰91精品啪中文字幕、灰綠逐漸變?yōu)樽匣液妥霞t，表明晚期陸上沖積扇沉積已經(jīng)代替了扇三角洲沉積亚洲精品视频在线免费，成煤作用隨之結(jié)束66j8影。

They are followed by main gravity-flow channel sandbodies and channel of middle fan in subaqueous fan.

次生孔隙形成的主要機(jī)理為：①黏土包膜的發(fā)育有利于次生孔隙的發(fā)育。

Research shows turning round vibration is the main vibration shape of system of direct empty cold construction, should consider fan of; of vibration shape coupling many a little bit the structural vibration that syntonic drive causes is answered lesser, movement of fan low frequency is more than the influence of high frequency movement to the structure to structural influence.

探究表明扭轉(zhuǎn)振動(dòng)是直接空冷結(jié)構(gòu)體系的主要振型久久精品国产99国产精2020丨，應(yīng)該考慮振型耦合毛黄视频；風(fēng)機(jī)多點(diǎn)諧振激勵(lì)引起的結(jié)構(gòu)振動(dòng)響應(yīng)較小，風(fēng)機(jī)低頻運(yùn)轉(zhuǎn)對(duì)結(jié)構(gòu)的影響大于高頻運(yùn)轉(zhuǎn)對(duì)結(jié)構(gòu)的影響丁香五月人人妻人人爽。

Then the two-pin fan power plug into the three-pin spare motherboard fan connector on the cathode and anode on the line, the gun is empty of the pin does not matter.

接著把風(fēng)扇的電源兩針插頭插到主板空閑的三針風(fēng)扇接頭上的正極和負(fù)極上就行了谁有黄色网站免费，測(cè)速的插針空著也沒(méi)有關(guān)系。

There are three features in the minibasins induced by gravitational sliding on the slope: the firstly, feature is surface of unconformity developed by onlap on minibasin margins or surface of unconformity truncated by mass transport-complex are sequence boundary in the study area; the secondly , accommodation of gravity flow is controlled by up lift rate and sedimentation rate , and styles of filling in the minibasins are dominated by the interrelationship between the two factors; and the third , there are two stacking patterns that consists of upward of turbidite fan-hemipelagic drape mud or mass-transport complexes-turbidite fan-hemipelagic drape mud.

認(rèn)為在深水陸坡重力滑動(dòng)作用所形成的微盆地內(nèi)在线观看黄片免费观看，層序邊界表現(xiàn)為微盆地邊緣上超不整合面或重力流對(duì)下伏地層的侵蝕不整合www插插插99；逆沖構(gòu)造隆升速率與沉積速率共同控制了重力流可容空間和沉積充填樣式；沉積垂向演化以塊狀搬運(yùn)復(fù)合體一濁積扇－深海披覆泥或濁積扇－深海披覆泥為特征亚洲狠狠艹。

If, therefore, the casing has an opening , as at DD, to allow the air to escape and the center or inlet of the fan is connected to the upcast shaft by means of a fan drift, air will be sucked up the upcast shaft and discharged into the atmosphere at the oulet,O.⑨Thus the upcast air column is rare fied or rendered less dense than that in the downcast shaft.

因此午夜肥婆，如果套管有開(kāi)放的，因?yàn)樵诜课菔鸶笔痖L(zhǎng)亚洲男人的天堂网址，讓空氣逃脫中心或進(jìn)氣道的風(fēng)扇連接到upcast軸通過(guò)一個(gè)風(fēng)扇漂移黄色网站黄色毛片，空氣將被吸了upcast軸和排放到大氣中，在oulet ，澳⑨因此upcast空欄是罕見(jiàn)然后將該或使其密度較低欧美在线VAV，比在downcast軸免费观看18禁网站入口。