qingguo's portfolio
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Portfolio Qingguo Wang
www.qingguowang.portfoliobox.net
1. Bus Rollover SimulationMotor Coach Industries
Bus rollover under ECE R66
The modification effectively decreased the intrusion of the bus structure to the survival space during the rollover collision.
Design of the bus bay section based on ECE R66- a): Specification of bus rollover test under ECE R66; b): Max deformation of the original structure during rollover; c): Max
deformation of the modified structure during rollover.
(a)
(b) (c)
Force testing of vehicle components
Force testing of bus cross window pillars. Force testing of parcel rack strut.
2. R&D EngineerFAW-Volkswagen
Vehicle structural design and analysis
Stress (top) and fatigue SF (bottom) of a shifting fork
EV engine assembly
Hub of a heavy truck
Tank assembly of a truck Steering-gear bracket
Steering knuckle
Gear shaft
Optimization of braking pedal bracket
159 240
Revised Original
Dynamic simulation of HEM using strong coupling FEA
Static stiffness
Dynamic stiffness
CAD model FEA model
3. U* Index and Load PathsUniversity of Manitoba
Fig. 1: Isotropic system for Original U* calculation- a): Original system; b): Modified system.
๐โ=1โ ๐๐ โฒ=[1โ 2๐
(๐พ ๐ด๐ถ๐๐ถ ) โ๐๐ด ]โ1
(a) (b)
U* index represents the coupling stiffness between an arbitrary point and the loading point.
total strain energy of original system
total strain energy of modified system
Original U* index
Fig. 2: Load transfer analysis of a plate with a hole- a): U* distribution and main load paths; b): Von Mises stress distribution.
U* index predicts accurate load paths, while stress concentrations make the load paths analysis difficult
U* VS. stress
๐พ ๐ด๐ถ=๐พ ๐ด๐ถ (๐ธ๐ฅ (๐ ) )=๐พ ๐ด๐ถ (๐ ) ๐๐โ=[1โ 2๐
(๐พ ๐ด๐ถ (๐ ) ๐๐ถ ) โ๐๐ด ]โ 1
Fig. 3: Orthotropic system for U*O calculation- a): Original system; b):
Modified system.
U*O index for composite materials
(a) (b)
(a) (c)(b)
Fig. 4: The U* or U*O distribution (contours) and the main load paths
(solid black lines) for- a): Isotropic structure, b): [90ยฐ]s fibre reinforced composite, c): [45ยฐ]s fibre reinforced composite.
Case study 1
(a) (c)(b)
Fig. 5: The U* or U*O distribution (contours), the main load paths (solid
black lines), and the reaction forces (bars) for- a): Isotropic structure, b): [0ยฐ/90ยฐ]s fibre reinforced composite, c): [ยฑ45ยฐ]s fibre reinforced composite.
(a) (c)(b)
Case study 2
(a) (c)(b)
4. U* Index in DesignUniversity of Manitoba
Load paths of a complex structure
(a)
(b) (d)
(c)
Fig. 6: Load paths analysis of a bus parcel rack strut- a): The parcel rack strut; b): Computational model; c): U* and main load paths; d): Von Mises Stress.
Prediction of failure mode
(a) (b)
Fig. 7: Prediction of the failure location- a): Singularity of U* variation; b): Failure location of the structure in force testing.
Design optimization
Increase of the consistency of U*
sum distribution can lead to improvement of structural efficiency.
The modified structure is 18.3% higher than the original one in terms of stiffness to mass ratio.
Fig. 8: Size optimization of a bus parcel rack strut- a): U*sum of the original
strut; b): U*sum of the modified strut; c): Process of the design optimization.
(a)
(b) (c)
Thanks for WatchingQingguo Wang
www.qingguowang.portfoliobox.net