Multibody analysis of a vending machine

Structural and dynamic optimzation

Turin 23 April 2013

Ing. Marco Morrone

1. SUMMARY

A. Altran Italia

B. System description

C. Analysis strategy and results

D. Conclusion

1. SUMMARY

A. Altran Italia

B. System description

C. Analysis strategy and results

D. Conclusion

ALTRAN ITALIA

MARKET DRIVERS

Time to market and development costs reduction are some of the most important target during project activities of new mechanical systems in every industrial sector.

CAE analysis is the most important method to reach these targets

Altran has developed a CAE competence center in order to perform the most important virtual analysis requested by the market,

CAE Competence center is able to perform analysis and to develop new methodologies for the following analysis types:

FEM analysis

CFD analysis

Multibody analysis

Virtual validation Solution

o About 100 employees working in research & development.

o Consolidated project management approach.

o Structured working flows and operative procedures for both

Product and Innovation development processes.

o Product development supported by advanced virtual validation

methods in both Design and Lab test stages.

o The company holds the patents related to the technology of its machines.

N&W is leader for the production of vending machine and it is always in research of innovative solutions:

N&W partenrshiip

1. SUMMARY

A. Altran Italia

B. System description

C. Analysis strategy and results

D. Conclusion

Aim of the project

The aim of the project is to optimize a mechanical system of a vending machine .

The optimization targets are :

• Remove or reduction of impact phenomenas

• Generation of a smoothly motion

• Reduction of engine torque

• Structural improvement of engine frame

System

The system is composed by :

• Cam

• Screaper

• Shifter

During its work the system is able

to produce hot beverage through an

infusion process

MB Model

• MB Model is composed by rigid

bodies.

• There are contacts between :

• Cam & scraper

• Cam & shifter

• Poisson contact model with

coloumb friction is used in the

model

• Costant speed rotation is applied

on the center of the cam

1. SUMMARY

A. Altran Italia

B. System description

C. Analysis strategy and results

D. Conclusion

During this phase the following analysis were performed

Definition of motion profile

Run with out contact with motion imposed for

every part of the system

Creation of CAM profile

During this phase the following analysis were performed

Contact introduction

Friction introduction

Analysis of the requested torque to the electric engine

Choose of the electric engine

1. Heading

Phase 1

Cam profile definition

Phase 2

Engine Torque

OPTIMIZATION

LOOP

During this phase the following analysis were performed

Calculation of the force acting on the system from MB Model

Generation of FE model for the support system

Static analysis for the worst load

Choose of the suitable material for the system components

During this phase the following analysis were performed

Topological optimization

Improvement of the stiffness for several components

Reduction of component material

1. Heading

Phase 3

Structural Analysis

Phase 4

Optimization

1. SUMMARY

A. Altran Italia

B. System description

C. Analysis strategy and results

D. Conclusion

Conclusion

From the multibody and FE analysis, the following results have been obtained:

• Smoothly motion of the scraper and shifter

• Reduction of engine torque

• Reduction of the acting forces on the fixing frame

• Improvement of the frame stiffness

• Reduction of material of the fixing system

• Reduction of time to market

Altair Knows HPC and works with customers

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