mechatronic modeling: pretensioner mechanism simulation analysis as part of a retractor mechanism....
TRANSCRIPT
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Mechatronic Modeling: Pretensioner Mechanism
Simulation Analysis as part of a Retractor Mechanism.
04/19/2006
Guillermo Cazares
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Presentation Content
• Background Information
• Functional Analysis
• Simulation Analysis
• Results
• Conclusion
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Problem Statement
• Analyze the performance of Pretensioner Mechanism as part of a retractor assembly in a seat belt system.
• Transfer of Pressure over the piston.• Transfer of torque to belt and determine
the length of belt.Note: The requirement is that 80mm of
belt must be pulled into spool in 12ms.(Beside packaging and weight requirements)
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Background Information
• Components of a Seatbelt System
Retractor
Buckle and Latch
Belt
Height Adjuster
Anchor
Front View of a Passenger Side Seat Belt System Schematic
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Background Information
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Background Information
Belt
Pretensioner Unit
Retractor Assembly
Locking Mechanism
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Background Information
Gas generator
Hub
Pinion
Gearwheel
Shaft
Spring
Cover
Housing
Roller
O-Ring
Assembly Vent
Tube
Damper
Piston
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Background Information
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Schematic Diagram
Signal From CU
Igniter Fires Propeller & Pressurizes the Chamber
Piston Movement
Pinion & Gear Wheel Rotates
Hub Rotates
Rollers Engage Hub to rotate Spool
Spool Pulls In Webbing
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1
OneJunction5
TFTF5
Integrate1
1Spool
MSeMSe1
TFTF4
I
I4
TFTF3SignalGenerator1
I
I3
I
I2
1Hub
TFTF2
I
I1
1Gear_Wheel
TFTF1
1Piston
Bond Graph
Transformer 1
Hydraulic Power to Mechanical Translation Power
Transformer 2
Mechanical Translation Power to Mechanical Rotational Power
Transformer 3
Mechanical Rotational Power.
Transformer 4
Mechanical Rotational Power.
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Resultsmodel
0 0.005 0.01 0.015 0.02time {s}
0
0.05
0.1
0.15
0.2 output {m}
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Comparison Results
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Resultsmodel
0 0.005 0.01 0.015 0.02time {s}
0
10
20
30
40
50
60
70
p1.f {m/s}
model
0 0.01 0.02 0.03 0.04time {s}
0
20
40
60
80
100 p.e {N}
model
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035time {s}
0
200
400
600
800
1000
1200
1400p.e {N.m}
Torque at the Spool
Speed of Piston
Force at the Piston
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Further Simulationmodel
0 0.005 0.01 0.015 0.02 0.025time {s}
-0.5
0
0.5
1
1.5
2
2.5 output {m}
Radius of 25 mm
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Conclusion
•The simulation used did give us the expected results expect that I had to remove some of the unknown R and C elements that in reality are present in the system.• At the same time the model provided useful information that is very difficult and costly to attain.• It allows you to gain knowledge of the behavior of a system with simple click of a button.
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Questions?
• Thank you for your Attention