Subject: VEHICLE NVH SIMULATION (A.A. 2021/2022)
Unit vehicle nvh simulation
To be chosen by the student (lesson)
Provide advanced numerical methods for NVH (Noise Vibration and Harshness) and comfort issues in the automotive field.
Knowledge of acoustic and vibration propagation inside materials in order to design noise and vibration abatements in vehicles.
Vehicle NVH testing
Sound propagation theory in materials (propagation of plane waves in air with complex formulation, propagation of sound with air-material interface, sound propagation in dissipative materials and multilayer systems);
Sound absorption of materials (types of materials, resonant systems and dissipative systems);
Measurement techniques of acoustical, physical and mechanical properties of materials;
Theoretical models for predicting acoustic properties of porous and multilayer systems;
Overview of FEM / BEM / SEA simulation techniques for automotive applications;
FEM acoustic modeling for automotive applications (cockpit, silencers);
Advanced modeling of finite elements for dynamic analysis of automotive components such as car frames and critical components;
Vibration suppression (design and methods for experimental testing of vibration dampers);
Laboratory: computer simulation activities with FEM software with automotive applications
Seminars: short seminars will be held during the course by automotive industry staff.
The course includes: theoretical lectures made with the aid of multimedia systems. The didactic material is uploaded before each lecture on the platform “Dolly” (http://dolly.ingmo.unimore.it); training and laboratory activities related to the FEM simulations of vibro-acoustic problems for automotive applications; technical seminars by specialists and educational visits at local companies. Due to COVID19 problems, the theoretical lessons and simulation tutorials can be delivered electronically (streaming or recorded). Deliverables are: a speech presentation with slides of 15 minutes regarding one numerical simulation performed during the course.
The exam consists in an oral test. The oral exam, for testing the understanding and application of the course content, consists of two parts: a 15-minute oral speech regarding the numerical simulation developed during the course, and an oral test regarding the course contents. The exam is passed if the score of each test is at least sufficient. The final mark is the arithmetic mean of the marks obtained in the two tests.
Knowledge and understanding: through lectures and technical seminars by specialists, students learn how to simulate NVH problems related to vehicles, and develop the ability to think out and implement original ideas and problem solving skills even in a Research & Development contest.
Applying knowledge and understanding: through the practical exercises and laboratory activities related to NVH simulations, students learn how to apply the knowledge gained.
Making judgments: through the engineering project development and the discussion with the teacher, students develop the ability to integrate knowledge and handle complexity, and formulate judgments even on the basis of incomplete or limited information, reflecting on social and ethical responsibilities linked to the application of their knowledge and judgments.
Communication skills: through the work in team and the discussion with the teacher, students develop the ability to critically communicate, especially using the engineering technical language, technical information, ideas, problems and solutions to both specialist and non-specialist.
Learning skills: the activities described allow students to develop the skills necessary to autonomously deepen technical topics, in order to effectively face professional challenges or to undertake further studies.
J. F. Allard, N. Atalla, Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials, Second Edition, John Wiley & Sons, Ltd, 2009
Mechanical Vibrations (6th Edition), Singiresu S. Rao, ISBN-13: 978-0134361307.
Noise and Vibration Analysis: Signal Analysis and Experimental Procedures, Anders Brandt, ISBN: 9780470746448.
Per l’approfondimento personale dei contenuti/For the personal deepening of contents:
S.Marburg, B. Nolte, Computational Acoustics of Noise Propagation in Fluids, Springer, 2008.
Carl Hopkins – Sound Insulation - Cap 4 (SEA Modeling)
Random Vibration and Shock Testing, Wayne Tustin.
Vibration monitoring, testing, and instrumentation, Clarence W. de Silva.
Vibration damping of structural elements, C. T. Sun, Y. P. Lu
Passive vibration isolation, Eugene I. Rivin
Vibration damping, control, and design, Clarence W. de Silva
Vibration: fundamentals and practice, Clarence W. de Silva