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Utilization and advantages of skeleton modelling in Catia
Environment
Ing. Jozef Bucha, PhD.
SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA
FACULTY OF MECHANICAL ENGINEERING
ESF 26240220076 Industrial research into the methods and procedures in generative design and knowledge engineering in car development, OP VaV
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Outline of presentation
Skeleton modeling,
Cava module for Catia
Using Cava in skeleton model,
MSC Adams/Car,
Using skeleton model with MSC Adams/Car,
Conclusion.
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Skeleton method in CAD Definition: The CAD skeleton is collection of specifications, which keeps functional characteristic of entire model.
The specification can be:
Surface geometry,
Wireframe geometry (Points, lines, planes),
Parameters and formulas,
Axis systems.
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Skeleton method in CAD Main advantages of using skeleton modelling are:
All information in assembly is stored in one placed and transferred trough product structure.
Every part or subassembly is constrained only to skeleton part. Assembly does not contain unnecessary constrains. Easy replacing of assemblies.
Mechanical designers involved in design can work individually, all necessary information are stored in shared skeleton part.
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Skeleton method in CAD Where to use skeleton method:
Mechanical models with different variations of dimensions but same kinematics function (suspensions, engines, boom arms, etc..)
Mechanical models with shape variations.
Disadvantage of skeleton modeling:
Skeleton modeling should be used from beginning of design process.
Making skeleton for one time project is time consuming.
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Skeleton method in Catia Assembly
Skeleton part
Part 1
Part 2
Specifications
Geometry
Geometry
Fixed constrain
Constrained to skeleton part
Constrained to skeleton part
Pseudo skeleton
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CAVA
Overall Vehicle Architecture,
Manikin,
Safety,
Vision,
Wiper,
Tools.
CATIA V5 AUTOMOTIVE EXTENSIONS VEHICLE ARCHITECTURE
Can be used through every step of vehicle design,
Can be helpfull in process of homologization,
Contains various standards (SAE, ECE,...), Fully parametrical, Detailed manual.
CAVA advantages
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CAVA Wheelbase Front
overhang Rear overhang
Overal lenght
Front track Rear track
2575 mm 1000 mm 775 mm 4350 mm 1564 mm 1557 mm
Front pneumatics Rear pneumatics
POTENZA RE050A 225/40 R 18
POTENZA RE050A 255/35 R 19
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OVA - Slope angle OVA - Static curb
OVA - Crash barriers OVA - Lamp position
CAVA Selected analyses
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CAVA Selected analyses
OVA - Side impact OVA - Number plates
OVA - Wheel covering OVA - TCD device
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CAVA Selected analyses
Vision - Plan view
Vision – CAVA mirror
Vision - Direct view 3D Vision – Close range visibility
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Using CAVA in skeleton model
Front suspension assembly
Rear suspension assembly
Vehicle assembly Overall data Seats Wheel Planes
Skeleton
Steering assembly
Body assembly
Skeleton
Coordinates
Skeleton
Coo
rdin
taes
, par
amet
ers,
form
ulas
Front suspension components
Rear suspension components
Steering components
Body components
Coordinates
Coordinates
Coordinates
Skeleton Parameters
Parameters
Parameters
Parameters
CAVA skeleton
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Using CAVA in skeleton model
Lower control arm
Suspension assembly Points
Axis systems Formulas
Cava skeleton
Steering assembly
Coo
rdin
ates
Coordinates
Par
amet
ers
Skeleton
Upper control arm
Knuckle
Wheel hub
Tierod
Upper strut
Lower strut
Spring
Coordinates
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Skeleton model of double wishbone suspension
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Skeleton model of double wishbone suspension Topology variations
Design table in Excel file
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Skeleton model of vehicle
Changing suspension type
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MSC Adams/Car
Adams/View, Adams/Car, Adams/Chassis, Adams/Driveline, Adams/Solver, Adams/Postprocessor, Adams/Flex, Adams/Insight.
Part of software package:
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MSC Adams/Car Procedure of vehicle creation
Template Subsystem Assembly
Template: basic block of vehicle; it defines basic topology of vehicle component, properties of parts, geometry of parts, used types of joint. It cannot be used directly in simulations.
Subsystem: based on template. One template can be used by multiple subsystems. In subsystems it is possible to alter some parametrical values, change properties of spring, dampers, modification of behaviour of vehicle component is not possible.
Assembly: collection of subsystems, which together compose valid suspension or full vehicle assembly. Both types of assemblies have prescribed minimum necessary types and number of subsystem
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MSC Adams/Car Suspension assembly
Suspension assembly Virtual stend
Suspension Steering Other
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MSC Adams/Car Full vehicle assembly
Full vehicle assembly Virtual stend
Virtual road
Front suspension
Break Drive
Rear suspension Steering Body
Front Wheels Rear Wheels
Other
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MSC Adams/Car Template of double wishbone suspension in Adams/Car
Skeleton of double wishbone suspension
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MSC Adams/Car Template of double wishbone suspension in Adams/Car
Skeleton of double wishbone suspension
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Transfer of data between Catia and Adams/Car Manual transfer: Directly in Adams/Car, by mouse and menus.
Automatic transfer: By macro in Adams/Car.
Delete simple geometry representation
Import new geometry as .stl or .catpart file
Compute new part properties from geometry (mass, inertia,
position of CG)
Change color of part
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Katona, S.: Parametrický model nápravy MacPherson, Strojnícka fakulta, STU v Ba, 2014
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Takács, J.: Parametrický model viacprvkového zavesenia nápravy automobilu, Strojnícka fakulta, STU v Ba, 2014
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Kiripolský, T.: Parametrický model lichobežníkovej nápravy automobilu, Strojnícka fakulta, STU v Ba, 2014
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Šimurka, D.: Parametrický model hrebeňového riadenia automobilu, Strojnícka fakulta, STU v Ba, 2014
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Change of Cardan joint position
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Change of pinion position on rack
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Change of pinion parameters
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Thank you for your attention
ESF 26240220076 Industrial research into the methods and procedures in generative design and knowledge engineering in car development, OP VaV