Engine-Gasket HPC trial and Suspension NVH analysis … · Suspension NVH analysis using...

© 2014 ANSYS, Inc. October 2, 2014 ANSYS Japan K.K. Proprietary

Engine-Gasket HPC trial and Suspension NVH analysis using

Linear_Perturbation

ANSYS Japan Mechanical BU

Toru Hiyake


• Topic 1 : Engine-Gasket Nonlinear Analysis – Legacy Data Import – Gasket modeling – Bolt Pretension modeling – HPC Performance

• Topic 2 : Leaf-Spring Suspension Dynamic Analysis – Tire Model – Leaf Spring Model – Suspension Assy Model – Linear Perturbation

Agenda


Topic 1 : Engine-Gasket Nonlinear Analysis


• Data Import in Mechanical using WB tool(External Model)

< Topic 1 : Engine-Gasket Nonlinear Analysis >

Legacy Data Import

Legacy FE Data (.cdb file)

ANSYS Mechanical

Engine Block(1)

Cylinder Head(x2) Gasket(x2)

Bolt(X16)


• Engine Block(1) + Cylinder Head(x2) + Gasket(x2) + Bolt(x16)


Legacy Data Import

Elements : 2,017,780 Nodes : 3,379,929 Total DOF : 10,130,299


• ANSYS Gasket Elements – Inter192-195

• Change Element Type

– From Solid185 to Inter195 • Solid185 is one order structural element(original element in .cdb file) • Inter195 is one order gasket element

– Using Command Object


Gasket Modeling : Element Setting

Solid185 element Inter195 element

Gasket

Gasket Mesh

Command Object


• Gasket Material – The gasket material is usually under

compression and is highly nonlinear. – The material also exhibits quite

complicated unloading behavior when compression is released.

• WB Engineering Data – ANSYS support Gasket material


Gasket Modeling : Material Setting

Gasket material in WB Engineering Data


• This boundary condition applies a pretension load to a cylindrical face, to bodies, typically to model a bolt under pretension. – Easy Bolt modeling

• In Mechanical , user can set this boundary condition easily. – Pattern copy using object generator


Boundary Conditions : Bolt Model

Bolt Pretension Setting in Mechanical


• Direct Node Selection for displacement’s constraint.


Boundary Conditions : Constraints

Boundary Condition Setting in Mechanical


• Analysis Type – Non-Linear Statics

• Solver Type – Sparse Direct Solver – PCG Iterative Solver

• HPC Setting – Parallel Type

• SMP(Shared Memory Parallel) • DMP(Distribute Memory Parallel)

– Number of Cores • 2,4,8,12


Solver Setting

Solver Type

HPC Setting

Analysis Type

Solver Type

Parallel Type

Cores

Sparse SMP

2,4,8,12 DMP

PCG SMP

DMP

Setting Combination


• DELL T5610 – Type A1 & A2 & A3


Hardware Information • DELL T7600

– Type B

CPU Memory HD Drive OS

Type A1 8 Core x 2(16 Core) , 2.6GHz 64GB , 1866MHz 3TB , 7200RPM Win7

Type A2 8 Core x2(16 Core) , 2.6GHz 64GB , 1866MHz 256GB , SSD Win7

Type A3 8 Core x2(16 Core) , 2.6GHz 64GB , 1866MHz 420GB, Fusion-io Win7

Type B 6 Core x 2(12 Core) , 2.3GHz 256GB , 1600MHz 2TB , 7200RPM Win8


• Sparse Direct Solver Information

• Nonlinear EQUILIBRIUM ITERATION – Total Number : 8


Analysis Requirements

H/W Solver Type Memory Mode .LN09

Type A Direct Optimal Out-of-Core 95GByte

PCG In-Core -

Type B Direct In-Core -

PCG In-Core -

100G Byte!!

Number of Iteration



Results

Mises Stress

Gasket Disp.


11.4

16.4

32.8

18.5

10.3

7.4

32.9

18.3

8.5 6.8

29.4

15.6

10.0 7.7

31.7

18.3

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

Direct_SMP Direct_DMP PCG_SMP PCG_DMP

HD SSD Fusion-io Large_MEM

• Hardware : HD , SSD , Fusion-io , Large_MEM • Solver : Direct_SMP , Direct_PCG , PCG_SMP , PCG_DMP • Number of Cores : 2(Default)


Results : Hardware v.s. Solver Ti

me

(hou

r)


10.3

7.2 5.6 5.0

7.4 5.5 4.8

3.0

32.9

17.9

11.8 10.1

18.3

5.5 3.4

2.5

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

2 Cores 4 Cores 8 Cores 12 Cores

Direct_SMP Direct_DMP PCG_SMP PCG_DMP

• Hardware : SSD • Solver : Direct_SMP , Direct_PCG , PCG_SMP , PCG_DMP • Number of Cores : 2 , 4 , 8 , 12

< Topic 1 : Engine-Gasket Nonlinear Analysis > Results : Parallel v.s. Solver

Tim

e (h

our)


Topic 2 : Leaf-Spring Suspension Dynamic Analysis


• Workbench Schematic

< Topic 2 : Leaf-Spring Suspension Dynamic Analysis >

Process Flowchart

Linear Perturbation

Nonlinear Statics Eigen Value Frequency Response



Tire Modeling

• Modeling Keyword – Hyper Elastic Material – Reinforce Elements – Hydrostatic Fluid Pressure – Contact

Section Tire & Wheel

Foot Print Deformation

Tire model for NVH Analysis


• Modeling Keyword – Large Deformation – Contact – Bushing


Leaf Spring Modeling

Front Bush Rear Bush x 2

Plate Contact

Deformation(Animation)


• Boundary Conditions – Tire Inner Pressure

• 0.2MPa – Contact between Tire and Ground

• Penalty Method • Friction : 0.2

– Contact between Plates • Augmented Lagrange Method • Friction : 0.2

– Enforced Displacement • Ground Area • Z direction : +40mm


Suspension Modeling

Displacement


• Non linear Statics – Elapsed Time : 506(s)


Suspension Analysis

Displacement Non_Linear Iterations

Equivalent Stress Equivalent Elastic Strain(Animation)


• Eigen Value Analysis after Static Analysis – Linear Perturbation Process

• Initial Stress • Last deformation & Stiffness


Suspension Analysis

Mode 2 : 16Hz(Animation) Mode 4 : 20Hz(Animation)


• Frequency Response Analysis after Eigenvalue Analysis – Modal FRF Creation


Suspension Analysis

Input Point (Under Leaf +Z)

Frequency Response Function

Output Point (Leaf Tip +Y)


• ANSYS HPC performance – ANSYS’s solver performance is continuing to be improved.

• SMP/DMP • Direct/Iterative • HPC

• ANSYS Non_Linear Staics & Dynamics Analysis – ANSYS has many nonlinear technology.

• Gasket • Rubber • Contact • Reinforce • Hydrostatic Fluid • Etc…

– Statics & Dynamics combination analysis(Linear perturbation) is very easy using WB.

Conclusion

Engine-Gasket HPC trial and Suspension NVH analysis … · Suspension NVH analysis using...

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