Noise Pollution

Scholar Year: 2018/2019 - 1S

Courses

Head Teacher Responsability Nuno António Neves Nunes Head

Weekly workload Hours/week T TP P PL L TC THE EL OT OT/PL TPL S Type of classes 3 Lectures Type Teacher Classes Hours Theorethical and Practical classes Totals 1 3,00

Teaching language

Portuguese

Intended learning outcomes (Knowledges, skills and competencies to be developed by the students)

Knowledge of basic of mechanical vibrations.
Knowledge of components of a vibration system and resonance phenomenon.
To know the principle of the vibration isolation. Must know what is the sound and the fundamental relations of the sound. Range of frequency and range of amplitude audible by ear.
To know the main quantities: pressure, intensity and power of a sound. Logarithmic scale and the decibel. Learn to add and subtract quantities in dB. Sound spectrum and octave filters. To know the equal loudness curves and weighting curves (A, B, C and D). To know the operation of a sound level meter and a dosimeter.
To know the anatomy of the human ear and the effect of noise on hearing and in the human body.
To know the requirements for good acoustics in audition rooms. Mode of sound propagation through air and structures.
To know how to calculate the sound power of a device. Must meet processes to reduce industrial noise.
To know the noise regulation more significant for this UC.

Syllabus

1. Vibrations
1.1. Introduction to mechanical vibrations
1.2. Simple harmonic motion
1.3. Components of vibration system
1.4. Free and forced vibration
1.5. Transmissibility and vibration isolation
2. Acoustics
2.1. Sound characteristics and properties
2.2. Frequency range and amplitude audible of human ear
2.3. Pressure , intensity and power of sound
2.4. Pressure, intensity and power sound levels. The decibel scale
2.5. Sound spectrum and octave filters. Equal loudness curves. Weighting Curves A, B , C and D
2.6. Noise measurement instruments. Sound level meters
2.7. Anatomy of the ear. Noise effects on human body
2.8. Room acoustics. Reflection and reverberation. Absorbers
2.9. Propagation of sound through air and structures. Sound propagation fields.
2.10. Determination of intensity and power sound levels
2.11. Industrial noise control. Identification and diagnosis of sound sources. Vibration reduction. Silencers
2.12. Legislation applied to environmental noise

Keywords

Technological sciences > Engineering > Sound engineering

Technological sciences > Engineering > Mechanical engineering > Vibration engineering

Demonstration of the syllabus coherence with the UC intended learning outcomes

The syllabus has been prepared taking into account the objectives of the curricular unit's.
Was divided into two parts namely vibrations and acoustics. Had kept in mind that some of the vibrations comprises about 20 % of the time which is reflected in the syllabus.
On the vibrations of the curriculum allows to transmit the knowledge objectives set out in a simple way to help understanding of acoustic phenomena.
In the acoustic part of the syllabus aims to meet the objectives set.
It presents the basic concepts of analysis tools including filters and weighting curves. The sound level meter is presented and studied. The effect of noise on the human body, sound propagation and
measurement of relevant quantities were considered in the syllabus.

Teaching methodologies

Theoretical-Practical classes: Theoretical exposure of the subjects followed by problems solving;
Realization of practical works related to the subject of sound and noise.

Demonstration of the teaching methodologies coherence with the curricular unit's intended learning outcomes

The Theoretical-Practical classes are composed by an expositive part, where the fundamental concepts of the different subjects are presented, followed by problems solving. The students are stimulated to participate in the resolution of the problems.
In the laboratorial classes the students in group, perform under the teacher supervision, practical work
with specific guidelines and final report presentation, or solve exercises to consolidate the subjects taught.

Assessment methodologies and evidences

The assessment is done by performing two tests (Tt) or an examination (Ex) and two laboratories works
(TL1 and TL2). The final grade (NF) is given by NF = 0.3 (Tt1 Tt2 +) + 0.4 MTL or NF = 0.6 + 0.4 Ex MTL (in which MTL is the simple arithmetic average of the laboratories works).
The score of the tests cannot be less than 8 values, while the exam score cannot be less than 9,5. The final grade, NF, must be greater or equal to 10 after rounding.

Primary Bibliography

Secondary Bibliography