Numerical and Experimental Analysis

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Information about Numerical and Experimental Analysis

Published on February 8, 2014

Author: galatticostef



Analysis of Machinery, Mechanical Vibrations and Acoustics

Eidos Engineering Eidos Engineering is an engineering company offering engineering service and innovative anti-vibration devices. Eidos Engineering is established in the technological center “Polo Tecnologico di Pordenone Andrea Galvani” in Pordenone (Italy).

Vibrations, noise and dynamics how to turn problems into opportunities For many companies, problems related to mechanical vibrations, noise and dynamics have a significant influence on the quality, reliability and conformity with the standards and specifications expressed by customers. Often, the solution of these problems involves time and cost also because of the absence, in the company staff, of a figure possessing the necessary skills. Eidos Engineering, technical study of the leading experts in the field of mechanical vibrations, noise and dynamics, provides the following services:  Dynamics of machinery  Mechanical vibrations  Acoustics  Design and supply of mass dampers  Numerical analysis and simulation  Experimental analysis  Training

Eidos know-how the work flow Investigation and technical specification Customer Selecting tools Experimental-numerical analysis Synthesis and processing solutions Prototyping and verification

Eidos know-how theory and practice Numerical analysis Experimental analysis ANALITICAL SOLUTION EFEA - EBEA Acoustics Acoustic maps and source identification High Frequency FEA Modal analysis Dynamic Low Frequency Cineto-dynamics and strain FEA - MULTIBODY Static Complexity

Our tools SOFTWARE and NUMERICAL ANALYSIS: Mathworks MatLab – multipurpose, data processing, application development MSC Patran – FEA modeler MSC Nastran – FEA solver for FEM and vibro-acoustics analysis MSC Adams – multibody analysis with rigid and flexible bodies Solidworks – solid modeler INSTRUMENTS and EXPERIMENTAL ANALYSIS: LMS Pimento – 16 channels acquisition system Accelerometers Load cell Pulse hammer Microphones and intensity probe Laser distance sensor National Instruments NI9237 – strain measurement

Simulation and Numerical Analysis

Finite element analysis Structural, modal and fatigue analysis, to a complete development of the components of machines.

Multi-body dynamics Eidos applies its knowledge on several kind of problems such as the analysis of articulated joints (i.e. diggers, robots,...) or in the development of high speed mechanisms (i.e. centrifuge).

Dynamics of structures Displacement [m] Vibration of structure Time [s] Friuli 1976 – Buja seismic station Displacement of the structure at top Dynamic analysis of a three stories structure. The graph shows the displacement of top of the structure under the 1976 Friuli earthquake.

Finite element acoustics Nowadays, acoustic standards increasingly demanding. are Washing machine cabinet vibration Strictly related to the vibration analysis, the predictions of noise emissions is the result of the application of the rights techniques. Eidos moves through different methods, such as FEA and experimental analysis, to better outline the problems and find out the solutions. Acoustic pressure inside a car Acoustic pressure inside a room at 66Hz

Self-balancing systems Ball balancing ring for rotors Fluid balancing ring for rotors

Experimental Analysis

Frequency response The first way to investigate the behaviour of a system is to measure its frequency response function. It may be found out by impulse hammers or by vibro-dynamic exciters. Vibro-dynamic exciter on a tool machine

Case study: chatter attenuation in a milling machine by mass damper

Case study: attenuation of rattle in transmissions Acceleration [m/s2] Rattle vibration Orginal solution Eidos solution Clutch 56% vibration reduction Acceleration RMS [m/s2] Motor shaft Sincronizer PTO 1000 1100 1200 1300 1600 1500 1400 Motor Speed [rpm] 1700 1800 1900 2000

Acoustic intensity map Noise levels and acoustic intensity maps Examples of acoustic intensity measurements and intensity maps of a burner and a washing machine. Major emission areas are automatically identified.

Main contact Eng. Stefano Galassi, Ph.D.  e-mail:  mobile: +39 333 6907275  tel.: +39 0434 507547  fax: +39 0434 507546  web:  headquarters: via Roveredo 20/b 33170 Pordenone, Italy

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