2024
Noise and Vibration
Name: Noise and Vibration
Code: EME13151M
6 ECTS
Duration: 15 weeks/156 hours
Scientific Area:
Mechanical Engineering
Teaching languages: Portuguese
Languages of tutoring support: Portuguese
Sustainable Development Goals
Learning Goals
Knowledge of linear systems with 1 degree of freedom.
Knowledge of linear systems with n degrees of freedom, including computational applications.
Knowledge of non-linear systems with 1 degree of freedom.
Domain of continuous systems with analytical solutions.
In-depth knowledge of noise in its technical aspects.
Knowledge of information sources and measurement equipment.
Knowledge of Software for dynamic and coupled systems.
Ability to identify industrial problems with solution under vibration and noise.
Knowledge of linear systems with n degrees of freedom, including computational applications.
Knowledge of non-linear systems with 1 degree of freedom.
Domain of continuous systems with analytical solutions.
In-depth knowledge of noise in its technical aspects.
Knowledge of information sources and measurement equipment.
Knowledge of Software for dynamic and coupled systems.
Ability to identify industrial problems with solution under vibration and noise.
Contents
1) Relevant laboratory equipment: accelerometers, hand vibrometers, microphones, data loggers.
2) Linear systems with 1 degree of freedom.
3) Principle of virtual power. Euler-Lagrange equations.
4) Deduction of mass matrices, damping and stiffness for n degrees of freedom.
5) Laboratory experiments in model structures. Experimental modal analysis.
6) Modal superposition and truncated modal superposition - static shift and static correction
7) Generalized proportional damping. Reduction to first order.
8) Analysis of continuous medium - second and fourth order hyperbolic systems.
9) Non-linear vibrations: Routh-Hurwitz criterion, Liapunov criterion. Methods of perturbation, method of Lindsedt. Noise and acoustics: pressure and acoustic power, noise level, noise exposure, noise perception, reflection, flutter.
10) Reverberation, absorption and transmission, propagation and structures. Application examples.
2) Linear systems with 1 degree of freedom.
3) Principle of virtual power. Euler-Lagrange equations.
4) Deduction of mass matrices, damping and stiffness for n degrees of freedom.
5) Laboratory experiments in model structures. Experimental modal analysis.
6) Modal superposition and truncated modal superposition - static shift and static correction
7) Generalized proportional damping. Reduction to first order.
8) Analysis of continuous medium - second and fourth order hyperbolic systems.
9) Non-linear vibrations: Routh-Hurwitz criterion, Liapunov criterion. Methods of perturbation, method of Lindsedt. Noise and acoustics: pressure and acoustic power, noise level, noise exposure, noise perception, reflection, flutter.
10) Reverberation, absorption and transmission, propagation and structures. Application examples.
Teaching Methods
Theoretical classes using Powerpoints, videos and quizes
Practical classes that include summaries and exercises, as well as applications in the workshop and professional center.
Presentations by invited experts.
A) Evaluation Methods
1) Development of a project in the area of vibrations or in the area of noise (at the student's choice) (classification in the interval [0.20]).
Weight 70%
2) Resolution of a faulty chip (rating in the range [0.20]).
Weight 30%
If the final mark is 10 or higher: Approved
If the final classification is less than 10 values: Disapproved
B) Student Accompaniment and Attendance
Question Time available 3 times a week, in sets of two hours each, in the teacher's office. Use of e-mail to ask basic questions or to mark another time of convenient accompaniment for each student.
Practical classes that include summaries and exercises, as well as applications in the workshop and professional center.
Presentations by invited experts.
A) Evaluation Methods
1) Development of a project in the area of vibrations or in the area of noise (at the student's choice) (classification in the interval [0.20]).
Weight 70%
2) Resolution of a faulty chip (rating in the range [0.20]).
Weight 30%
If the final mark is 10 or higher: Approved
If the final classification is less than 10 values: Disapproved
B) Student Accompaniment and Attendance
Question Time available 3 times a week, in sets of two hours each, in the teacher's office. Use of e-mail to ask basic questions or to mark another time of convenient accompaniment for each student.
