Authors:J . Croes 1 , S. Iqbal 1 , A. Reveillere 2 ,
description
Transcript of Authors:J . Croes 1 , S. Iqbal 1 , A. Reveillere 2 ,
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Multidomain modeling approach for energy analysis and redesign of production machinery applied
to weaving looms
Authors: J. Croes1, S. Iqbal1, A. Reveillere2,D. Coemelck3, B. Pluymers1, W. De roeck1, W. Desmet1
1: KULeuven 2: LMS Imagine 3: Picanol
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Table of contents
1. Introduction
2. Description of the model1. Losses in bearings & seals
2. Losses in cam & follower
3. Losses in 3D multibody mechanism
3. Model updating
4. Analysis
5. Multidomain modeling for redesign
6. Conclusions & future work
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Description of the system
gearbox
cam&follower mechanism
3D mechanism
3D mechanism
rapier wheel with gripper
1. Introduction
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System under investigation• High dynamic weaving machine• Strongly coupled modules• Losses in order of magnitude of kW
Most dominant loss sources• Friction in bearings, seals, gears, cam&follower• Losses in electric motor
Objective• Analysis of loss distribution in the system to improve the overall
efficiency
Requirements• Component loss models with reasonable level of accuracy• Accurate description of the dynamic behavior of the system
1. Introduction
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2. Description of the model
cosi
mul
atio
n
cosimulation
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Bearing (seal) losses• Modeled as a friction torque in opposite direction of the velocity• Loss is estimated according to Palmgren or SKF model• Bearing loads come from contact in gear teeth, cam & joints• Implemented as an multidimensional loss map• Dedicated development of bearing component
2. Description of the model1. Losses in bearings & seals
)/( tanhTTT loss12
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2. Description of the model
cosi
mul
atio
n
cosimulation
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2. Description of the model
Cam & follower mechanism• Extension of existing cam rocker model with conjugate part• Linear stiffness behavior at cam & follower contact• Losses implemented and added at the cam shaft• Forces are defined as external variables• Loop is closed inside the submodel
2. Losses in cam & follower
cam shaft
follower shaft
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2. Description of the model
Cam & follower mechanism
2. Losses in cam & follower
slidingSslidingMrollingSrollingMbearingSbearingMloss PPPPPPP
)10/tanh()(
6
gaus
PT lossloss
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2. Description of the model
cosi
mul
atio
n
cosimulation
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2. Description of the model3. Losses in 3D multibody mechanism
3D mechanism• Model 3D kinematics(loads, velocities)
• Rotation vectors change in magnitude and orientation
• Need for multibody software
• AMESim calculates friction torque
• Modeled as equivalent inertia
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2. Description of the model3. Losses in 3D multibody mechanism
Post processing motion signals
Action points• Axis definitions
• Joint definitions
• Mind sign conventions
• Discrete nature signals
• Communication interval
Computation time• Tolerance
• Step size
loss torqueloads, velocities
loads, velocities of each shaft
loss torque
input output shaft AMESim
cosim block
- radial load 1- radial load 2- axial load- velocity
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3. Model updating
Use of two configurations to estimate & validate parameters
configuration 1
configuration 2
T(1,2)
T(2,1)
T(1,2)
T(2,1)ω(1,1)
α(2,2)
α(2,2)
ω(1,1)
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3. Model updating
Procedure
Pre- and postprocessingr
Simulation
- Sensitivity analysis- Updating procedure
- Runs with different parameters
Dominant parameters/components- Stiffness & damping of the cam shaft- Bearing loss model- Motor loss map
Dynamic behaviorEnergetic behavior
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3. Model updating
Configuration 1: 500 RPM mean velocity
Dynamic behavior
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3. Model updating
Configuration 1: 600 RPM mean velocity
Dynamic behavior
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3. Model updating
Configuration 2: 500 RPM mean velocity
Dynamic behavior
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3. Model updating
Configuration 2: 600 RPM mean velocity
Dynamic behavior
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3. Model updating
Properties• Measurements linear regression between different temperatures• Viscosity exponential curve• Slope 34.4W/°C (config 1) vs 53.2W/°C (config 2)
Losses at 48.4°• Configuration 1 2% overestimation losses in the model• Configuration 2 20% underestimation losses in the model
Preliminary conclusions• Temperature (viscosity) has significant influence (lubrication assumption)• Increase of damping decreases the losses• Motor losses contribute to the slope increase
Power measurements
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4. Analysis
Energetic analysis• Usage of the model to asses energy loss distribution• Gain insight in how dynamics/components influence energetic behavior• Use the model to formulate design guidelines
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Flow chart of energy losses
4. Analysis
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5. Multidomain modeling for redesign
• Virtual energy analysis leads to more insight in the most dominant loss sources and the most influential parameters
1: Lubrication properties highly influence the friction losses
2: Dynamic excitation is the main input for mechanical loss models
Multidomain analysis allows you to quantify the losses!
Provides a basis for experimental testing
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5. Multidomain modeling for redesign
1: Lubrication properties highly influence the friction losses
Virtual experiments• Increase the oil temperature by 10°
– 10% decrease in energy loss
Physical experiments:• Increase the oil temperature by 3°
– 3,8% decrease in energy loss
• Reduce the oil flow by 60%– 10% decrease in power consumption
– Increase of oil temperature by 6°
– Increase and decrease of bearing temperatures by ±3.5°
Lubrication regime can be optimized for energy consumption without jeopardizing performance & lifetime
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5. Multidomain modeling for redesign
2: Dynamic excitation is the main input for mechanical loss models
Virtual experiments• Decrease equivalent inertia of the gearbox (scales with n²)• Reduces dynamic loads and by extension bearing friction
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5. Multidomain modeling for redesign
2: Dynamic excitation is the main input for mechanical loss models
Virtual experiments• Increase damping on the main shaft by mounting damping layer• Significant reduction of dynamic forces • Dissipation caused by damper is small compared to the reduction in
friction loss in the bearings by decreasing the load
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5. Multidomain modeling for redesign
2: Dynamic excitation is the main input for mechanical loss models
Virtual experiments• Reassess cam profile• A smaller curvature radius leads to
– Decrease in torsional vibrations– Lower rotational velocities at bearings– Decrease in rolling & sliding friction
cam shaft
follower shaft
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5. Multidomain modeling for redesign
2: Dynamic excitation is the main input for mechanical loss models
Other virtual experiments can be• Assessing the effect of different bearings• Changing the load distribution to decrease the friction• Apply different topologies for some subsystems• Changing inertia’s & stiffness of specific components• …
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5. Conclusions & future work
Conclusions• Dynamic and energetic behavior can be modeled using combined
1D/3D approach• Accurate estimation of dynamic behavior is necessary to estimate
the losses• Representative loss models are required• Virtual energetic analysis provides good insight in the physical
behavior and leads to a better design• Virtual experiments quantify the influence of redesign changes on
the energy efficiency
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5. Conclusions & future work
Future work• Model updating of loss behavior• Usage of the model to do a detailed analysis• Usage of the model to do virtual experiments for redesign
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