>> P.72
1-4BearingSelection(16)NoiseConfirmationofbearingnoiseperformanceisdonewithananderonmeter.Belowisanoverviewofanderonmeters.*Anderon:AunitusedtoexpressthevibrationuniquetobearingsAnderonmeterAnanderonmeterisadevicewhichrotatesbearingsasacompleteproducttomeasuretheirvibrationproperties.Thebearinginnerringismountedontheanderonmeterspindleandrotatedat1800min-1;preloadisappliedtothestationaryouterring,aspeedsensoristouchedtotheouterringperiphery,andthemechanicalvibrationtransmittedtotheouterringisextractedaselectricalsignalsforevaluation.Byrotatingtheinnerringonahigh-precisionspindleanddetectingvibrationdirectlyfromtheouterring,externalinfluencescanbeeliminatedandweakvibrationcanbedetected.ThevibrationdetectedisdividedintoL(lowband),M(mediumband),andH(highband),andconfirmedandevaluatedineachfrequencyband.Aswell,headphonescanbeconnectedtotheanderonmetertoconfirmnoiseperformance.Theminiatureandsmall-diameterrollingballbearingsmanufacturedbyMinebeaMitsumifocusonlowernoiseduringrotation,aswellasthevibrationissuesaddressedabove.Approachestolowernoisehavebecomemoreandmoreimportantinrecentyearsasdemandsforenergysavingappearineveryfield;bydetectingscratchesanddetritusinbearingcomponentsandimprovingbearingquality,wesupportlowernoiseinautomobiles,industrialproducts,andhouseholditemslikeairconditionersandventilationfans.BandFrequencyband(Hz)PickupL:LowbandM:MediumbandH:Highband50~300300~18001800~10000SpringRetainerLoad1800min-1SpindleBearingFig.16-1Simplediagramofdetectionpart72
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