小型離心風(fēng)機(jī)機(jī)械振動(dòng)分析及實(shí)驗(yàn)研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文小型離心風(fēng)機(jī)機(jī)械振動(dòng)分析及實(shí)驗(yàn)研究姓名：胡彪申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：制冷及低溫工程指導(dǎo)教師：舒朝暉20110109華中科技大學(xué)碩士學(xué)位論文IIAbstractVibrationisanimptantindicationofsystemperfmanceincentrifugalfan.Vibrationofthecentrifugalfanitsdynamicbehavihasbecomeakeytechnolo

2、gyofsomecpationswhichconcernsthesafenmaloperatingofthemachine.TheimpellevoluteareprincipalpartsofthefantheirperfmancehaveanoutsizedeffectontheefficiencyofthefanAsthemainsourceofvibrationnoiseinfanoperationtheresearchonth

3、eirVibrationactersareverynecessary.Centrifugalfanimpelleristhececomponentoffanfenergyconversionitdirectlyaffectsthecoefficientofsafetyofthefan.ThispaperusetheANSYSsoftwaretodothefiniteelementanalysisfstrengthCalculatingt

4、hemodaloftheCentrifugalfanimpelleroptimumdesignoftheimpellerareproposedincombinationwiththeexperimentaldataseveralpracticalcircuits.Theoptimizedimpellerholdstheadvantageoverrightnownomatterfitsprocessfeaturesmechanicalpr

5、operties.Thevoluteisoneofthemainareaswhichproducevibratymotions.Thepapersimulatedthenaturalfrequencyofthevolutediscussedtheinfluenceofitsnaturalfrequencywhenchangingthethicknessatdifferentpartsofthevolute.Atlastaoptimumd

6、esignisproposeditsnaturalfrequencyarefarawayfromthebasicfrequencydoublefrequencyofthefan.Thecentrifugalfcecausedbytheunbalancevalueoftheimpellerisoneoftheimptantreasonswhichcausethefanvibration.Thispaperdidthefiniteeleme

7、ntanalysisfthemodalofthefantestbedtoobtainitsnaturalfrequency.Basingonthemodalanalysisharmonicresponseanalysisofthetestbedwasdonetoobtainthegraphbetweenthevaluesofresponse(displacement)frequencies.Thedynamicresponsevaria

8、tionsofthetestbedwereexpledwhenchangingtherigidityoftheabsbersthedistancesbetweeneachabsber.Atlastthemostsuitablerigidityoftheabsberwasobtainedwhileusingcurrenttestbedthemostsuitabledistancesbetweeneachabsberwasalsoobtai