Ljudreduktion för maskiner som arbetar i flera kvadranter
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Transcript of Ljudreduktion för maskiner som arbetar i flera kvadranter
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Ljudreduktion för maskiner som arbetar i flera kvadranter
17/4-2012
Liselott Ericson
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Introduction
The combustion engine’s noise level has been reduced
Makes the hydraulic systemnoise level more apparent
Increased pressure levels and reduced weight of the hydraulic system
Increases the noise level
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General Noise
Excitation Emitted noiseResponse
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Noise in Fluid Power Systems
Force and moment pulsation
Excitation System Response Emitted noise
Mechanicalvibration
PressurepulsationFlow pulsation
Noise
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Hydraulic resonance response
Mechanicresonance response
Mechanic resonance response
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Noise in Fluid Power Systems
Force and moment pulsation
Mechanicalvibration
PressurepulsationFlow pulsation
Noise
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Hydraulic resonance response
Mechanicresonance response
Mechanic resonance response
Excitation System Response Emitted noise
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Reduce Noise in Fluid Power Systems
Force and moment pulsation
Mechanicalvibration
PressurepulsationFlow pulsation
Noise
ScreeningIsolation
GeometryMaterialPipe clamping
PipesVolumesOrifices
Reducing the excitation energy from pump/motor
System developer
Pump/motor designer
Hydraulic resonance response
Mechanicresonance response
Mechanic resonance response
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Excitation System Response Emitted noise
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Flow Pulsations
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Flow Pulsations
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Flow Pulsations
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Note: The kinematic flow
rip
ple is changed
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Pump Motor
Pump vs. Motor
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Pump vs. Motor
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Pump Motor
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Cross-angle
Cross-angle, g
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The Cross-angle varies the dead centre at displacement changes.
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PUMP
Displacement
Rotational direction
Counter-clockwise
Clockwise
Negative PositivePUMPMOTOR
MOTOR
Left port pressurised Right port pressurised
Displacement
Rotational direction
Counter-clockwise
Clockwise
PositivePUMP MOTOR
MOTOR PUMP
Negative
Different Driving Modes
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Common Noise Reduction Features
Pre-compression and decompression angle Very sensitive for changes
of operational conditions
Pressure relief groove
Pre-compression filter volume
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Pre-compressionfilter volume Pressure
relief groove
Sound Pressure at pump housing vs. Flow Ripple
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Small volume
Large volume
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System knowledge
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Noise reduction
Syst
em k
now
ledg
e
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Pump/motor working space
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Noise reduction
Pum
p/m
otor
wor
king
spa
ce
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Variable pressure with fix displacementConstant pressure with fix displacement
Fix pre-compression
Gradual pressuris
ation
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The choice of noise reduction feature
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The choice of noise reduction feature
Constant pressure with variable displacement
Fix pre-compression
and Cross-angle
Gradual pressuris
ation
and Cross-angle
Variable pressure with variable displacement
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Variable pressure with variable displacementfixed pressure port
Gradual pressuris
ation
and Cross-angle
Variable pressure with variable displacementchanged pressure port
Gradual pressuris
ation ???
The choice of noise reduction feature
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Fix pre-compression
Gradual pressurisatio
n
Fix pre-compression
and Cross-angle
Gradual pressurisatio
n
and Cross-angle
Gradual pressurisatio
n
and Cross-angle
Gradual pressurisatio
n???
The choice of noise reduction feature
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Tack för din uppmärksam
het