Machine design ingress egress

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alvin_shim

alvin shim

Engineering

Vehicle Doors
1. Types
a. Suicide
b. Canopy
c. Gull-Wing
d. Butterfly & Scissors

Challenges of Gull-Wing Doors
1. Pros
a. Easier entry due to high height restriction
b. Less sideway clearance needed
1. Cons
a. Roll over
b. Need Support to hold in place
c. Hard to weather proof

1. Components
a. Hinges
b. Panel
c. Gas Struts
d. latches
e. Windows & Sealing
ADR

Hinge Designs
1. Specification of Hinges
a. Von Misses stress > Yield Stress
b. High Stiffness of the arm
c. Weather resistance
d. Shearing Stress of the Pin
e. Fasteners on bracket
f. Fatigue resistance
g. Reduce stress concentrators
h. Weight

FEA of hinge, Aluminium 6061 (T6)
Transverse load of 4.5kN Longitudinal load of 5.5kN

Fasteners,
Similar to the pin, under shear rate it against
material shearing.
Under Tensile load, Compute for Stress Area to
find nominal diameter of the screw to use.
Stress area = nominal diameter /proof strength

Panel Composition
A sandwich of Carbon Fibre skin a core.
The core provides high shear strength and
stiffness.
The core replace what would be multiple
laminate layers.
Effective flexural stiffness
(EI)eff = Ep ep (ep + ec)2 / 2
ep = thickness of skin
ec = thickness of core
Ep = the modulus of elasticity of the material
skin

Gas Struts
Mock up Spec
Extended length of 550mm
Stroke range of 280mm
Strut size of 8-18(greater value mean larger force it can
hold)
Force limit: 650N

Damping System of Gas Struts
Restrictor check valve piston

Latches
Bear Claw latches
Rotary latches
Similar to Hinges in term of mechanical
properties requirement.
Additional care needed to be taken so that the
latch much meet the requirement of two latching
position.

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Machine design ingress egress

1. Ingress & Egress Alvin Shim 1770934 MEE30002 - Machine Design

2. Vehicle Doors 1. Types a. Suicide b. Canopy c. Gull-Wing d. Butterfly & Scissors

3. Body Design 2016

4. Gull-Wing Door 1.8m

5. Challenges of Gull-Wing Doors 1. Pros a. Easier entry due to high height restriction b. Less sideway clearance needed 1. Cons a. Roll over b. Need Support to hold in place c. Hard to weather proof

6. 1. Components a. Hinges b. Panel c. Gas Struts d. latches e. Windows & Sealing ADR

7. Hinge Designs 1. Specification of Hinges a. Von Misses stress > Yield Stress b. High Stiffness of the arm c. Weather resistance d. Shearing Stress of the Pin e. Fasteners on bracket f. Fatigue resistance g. Reduce stress concentrators h. Weight

8. FEA of hinge, Aluminium 6061 (T6) Transverse load of 4.5kN Longitudinal load of 5.5kN

9. Pin Shearing

10. Fatigue loading

11. Fasteners, Similar to the pin, under shear rate it against material shearing. Under Tensile load, Compute for Stress Area to find nominal diameter of the screw to use. Stress area = nominal diameter /proof strength

12. Panel Composition A sandwich of Carbon Fibre skin a core. The core provides high shear strength and stiffness. The core replace what would be multiple laminate layers. Effective flexural stiffness (EI)eff = Ep ep (ep + ec)2 / 2 ep = thickness of skin ec = thickness of core Ep = the modulus of elasticity of the material skin

13. Carbon Fibre with Cores

14. Gas Struts Mock up Spec Extended length of 550mm Stroke range of 280mm Strut size of 8-18(greater value mean larger force it can hold) Force limit: 650N

15. Damping System of Gas Struts Restrictor check valve piston

16. Torsion Bar

17. Latches Bear Claw latches Rotary latches Similar to Hinges in term of mechanical properties requirement. Additional care needed to be taken so that the latch much meet the requirement of two latching position.

Editor's Notes

https://en.wikipedia.org/wiki/Suicide_door https://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=0ahUKEwjZvoGF0tDLAhWG6KYKHco5APgQjxwIAw&url=http%3A%2F%2Fwww.carponents.com%2Fcontent%2Fdoor-jammin-a-quick-overview-on-the-most-popular-car-door-types-161&psig=AFQjCNF01mKEVcZtWckDD1piDkfsUS76XQ&ust=1458610594771033&cad=rjt http://www.autoevolution.com/news/car-door-types-sliding-butterfly-that-commits-suicide-with-scissors-43632.html
http://www.osti.gov/scitech/servlets/purl/10157028/
http://euler9.tripod.com/bolt-database/23.html
http://www.hexcel.com/Resources/DataSheets/Brochure-Data-Sheets/Honeycomb_Attributes_and_Properties.pdf
Ref: https://www.google.com.au/search?q=carbon+fibre+core&biw=1704&bih=969&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjwmtjn0NDLAhUm5KYKHaNICmEQ_AUIBigB#tbm=isch&q=carbon+fibre+plywood+core&imgrc=jLJlAe_fHtwZsM%3A
http://dacoglu.com/desotocd/14_body/proprods-technical_guide.pdf
http://dacoglu.com/desotocd/14_body/proprods-technical_guide.pdf
https://www.google.com.au/search?q=delorean+torsion+bar&rls=com.microsoft:en-AU&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiB-sLL8NDLAhVlLKYKHXocDoYQ_AUIBygB&biw=1184&bih=612#imgrc=uJ6EsBd2D0slEM%3A
http://www.3dcontentcentral.com/download-model.aspx?catalogid=3607&id=1705

Machine design ingress egress

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Editor's Notes