l'analisi multibody nell’industria automotive: adams/car · l'analisi multibody...
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Paolo Gervasio
MSC.Software Project Manager
l'analisi multibody nell’industria automotive:Adams/Car
MSC.Software Project Manager
Mercoledì 30 aprile 2014
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• ADAMS: Automatic Dynamic Analysis of Multibody System– Presentazione di Adams quale solutore di sistemi multicorpo, I diversi software della suite
Adams e la loro integrazione in Adams/Car.
• Adams/Car– Perché A/Car e sua struttura. Organizzazione dei dati e realizzazione dei modelli utente
mediante il sistema template->subsytem->assembly.
• Simulazioni con A/Car– Tipologie di simulazioni affrontabili con Adams/Car, peculiarità e ambito di applicazione.
Agenda
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• Realizzazione di nuovi modelli– Il template builder e la creazione di modelli parametrici.
• SmartDriver– Il pilota di A/Car, dove interviene e suo utilizzo.
• Adams/Tire– Modelli di pneumatico disponibili in A/Car, cosa sapere per un uso corretto.
• Adams/Controls– Cosimulazione in ambiente Adams/Car
• Adams/Flex– Introduzione di corpi deformabili in un modello Adams.
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Definizione di sistema Multi-Body
• Sistema di parti meccaniche rigide / flessibili
• Interconnesse da giunti rigidi / elastici
• Soggette a qualsiasi sistema di forze
• Compiono grandi spostamenti nello spazio 3D
Introduzione alla dinamica dei sistemi multi-body
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•
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Introduzione alla dinamica dei sistemi multi-body
Definizione di sistema Multi-Body
•Dinamica descritta da equazioni differenziali
•Vincoli descritti da equazioni algebriche
� Sistema di equazioni DAE non-lineare
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� Sistema di equazioni DAE non-lineare
Risoluzione di tipo numerico
� Integratori ODE
(Ordinary Differential Equations)
� Integratori DAE
(Differential Algebraic Equations)
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Introduzione alla dinamica dei sistemi multi-body
Basic Concepts
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Basic Concepts
Introduzione alla dinamica dei sistemi multi-body
� Kinematics:
o Study of motion of a system without regard to motivating forces
o All degrees of freedom are prescribed as functions of time
o Forces cannot affect motion
o Forces calculated as a consequence of motion
o Displacement, Velocity, Acceleration and Reaction force solution is algebraic in nature
o No need to solve differential equations
� Statics:o Study of equilibria of a system without regard to inertia forces or velocity dependent forces
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o Study of equilibria of a system without regard to inertia forces or velocity dependent forces
o System velocities and accelerations are zero at each configuration
o Force affects configuration only
o Governing equations are algebraic in nature
� Dynamics:
o Study of motion of a system as a consequence of applied forces and inertia forces
o Forces affect accelerations
o Accelerations are integrated to velocities
o Velocities are interated to give displacements
o 2nd order differential equations are to be solved
� Linear Analysis:o Study of the modes of vibration of a system at any specified operating point:
o Equations of motion are linearized about operating point to getare constant matrices
o Vibration mode shapes and frequencies are analyzed by solving the associated eigenvalue problem
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Introduzione alla dinamica dei sistemi multi-body
ADAMSAutomated Dynamic Analysis of Mechanical System
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GENERAL PURPOSE COMPUTER PROGRAM
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Applicazioni dell’Analisi Multibody
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Applicazioni dell’Analisi Multibody
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ADAMS/ExchangeADAMS/Exchange
ADAMS Full SimulationADAMS/View(Pre/Post) & ADAMS/Solver
ADAMS/Controls ADAMS/Durability ADAMS/Flex ADAMS/Linear
ADAMS/Postprocessor
ADAMS/InsightADAMS/Insight
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Test labEngine Advanced
Engineering
Suppliers
• Bridges departments by sharing models and data
• Facilitates quick subsystem changes
• Templates
Applicazioni dell’Analisi Multibody nella grande industria
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DrivelineChassis
engineeringBody
engineering
Suppliers
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Applicazioni dell’Analisi Multibody nella grande industria
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ADAMS/ExchangeADAMS/Exchange
ADAMS Full SimulationADAMS/View(Pre/Post) & ADAMS/Solver
ADAMS/Controls ADAMS/Durability ADAMS/Flex ADAMS/Linear
ADAMS/Postprocessor
ADAMS/InsightADAMS/Insight
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Adams/Car
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Adams/Car: gerarchia dei modelli
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• A database is a collection of tables (directories) stored on the hard drive. The top directory, which has the extension .cdb, stores a number of tables (directories). Each table is a placeholder for model information.
Adams/Car: organizzazione dei dati
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Adams/Car: file di simulazione
Driver control data file (.dcd)
Event file (.xml)
Adams command file (.acf)
Adams dataset file
(.adm)
Adams/Car Interface
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Adams/Car Solver
.msg
.req
.res
.gra
.out
Output files
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Adams/Car: tipologie di simulazione
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Adams/Car: tipologie di simulazione
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Adams/Car: Template builder
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1. Calcola con un solutore quasistaticoun profilo di velocità coerente con la traiettoria e i limiti del veicolo
2. Il solutore interno (modello rigidosemplificato) verifica l’applicabilitàdella velocità richiesta in quel punto di
Adams/SmartDriver
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della velocità richiesta in quel punto disimulazione e ne richiede la eventualecorrezione
3. Il veicolo viene risolto nelle condizionipreviste con il modello semplificato
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Adams/Tire
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Adams/Tire
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Adams/Controls (Co-simulation)
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• Function evaluation (or continuous) mode lets the MATLAB (or EASY5) integrators solve the entire problem made up of the Adams equations and the MATLAB (EASY5) equations. In this mode, Adams simply acts as a ‘function evaluator’ for the MATLAB (EASY5) integrator.
Adams/Controls (Function evaluation)
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Mode Integrators used Comments
Co-simulation MATLAB and AdamsMATLAB solves Simulink model, Adams/Solver solves Adams model. Data exchanged periodically.
Function Evaluation MATLABMATLAB solves both, Simulink model and Adams model. Adams/Solver just acts as function evaluator for MATLAB integrator.
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If you can satisfy these requirements:
1. MATLAB with a Real Time Workshop license available.
2. Microsoft Visual C++ for compilation in RTW. Other C/C++ compilers (for example gcc) will not work properly.
3. An available Adams/Controls license.
Adams/Controls (Control system import)
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*.dll
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• Adams will support the Functional Mock-up Interface (FMI) standard
Adams/Controls (FMI Co-simulation)
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Adams/Flex: Component Mode Synthesis
free-free mode
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static correction mode
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Use Lagrangian Formulation:
Extended DOF table ξ
Rigid
Modal
Th
e F
lexib
le B
od
yAdams/Flex: Coupling Equation of Motion
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5. Solve Equations
1. Compute position of point P in Global Ref.
up
≅ Σ Φi(P)qi2. Use Modal Expansion approximation for up
3. Derive w.r.t. time and compute vp
4. Compute Kinetic and Potential Energy for the FB
Th
e F
lexib
le B
od
y
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Adams/Flex
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MSC & University
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• FEA Solver Used by Large Manufacturers
MSC Nastran Student Edition (with Patran)
• FEA Solver for Tough Nonlinear Problems
Marc Student Edition (with Mentat)
MSC Nastran-Patran
MSC Student Editions
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• FEA Solver for Tough Nonlinear Problems
• Kinematic and Dynamic Analysis of Systems
Adams Student Edition (with View)
Marc-Mentat
Adams-View
• Powerful Acoustic Simulation Software
Actran Student Edition
Actran
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Learning Resources for Teachers
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• MSC Learning Center - $99 Subscription for Students
• Video Tutorials – Student Edition Tutorials
• Actran Student Edition Tutorials – Problem Sets
• SimCompanion – Knowledge Base Portal
Learning Resources for Students
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