Course detail
Noise and Vibrations
FSI-IHV Acad. year: 2020/2021 Winter semester
The following topics will be dealt with: Sources and sound propagation in closed and free areas. Monitoring and reduction of the noise in the living and working environment. Generation of vibrations, sensors and instruments for vibration measurement. Influence of the noise and vibrations to human health condition. Standards and limits. Practical acoustical measurements in common situations.
Language of instruction
Czech
Number of ECTS credits
4
Supervisor
Department
Learning outcomes of the course unit
Knowledge of basic physical quantities for description of noise and vibrations in the working and living environment. Basic overview of standards and regulations concerning the measurement and evaluation of the noise and vibrations. Basic information about techniques for decreasing the noise and vibrations.
Prerequisites
Oscillations. Simple harmonic motion. Superposition of harmonic oscillations. Waves. Types of waves: Longitudinal and transversal waves. Plane and spherical waves. Linear polarized waves. Superposition and interference of waves.
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is suplemented by practical laboratory work.
Assesment methods and criteria linked to learning outcomes
To receive a course-unit credit, a student has to attend all laboratory measurements and to hand over the reports. The exam has 2 parts: oral and written (theory and a solution of a problem).
Aims
The aim of the course is to make students acquainted with problems caused by noise and vibrations so that they will be able to monitor the sound fields and vibrations, to measure relevant physical quantities and apply theoretical laws for their reduction. Acquiring basic knowledge about standards and regulation limits.
Specification of controlled education, way of implementation and compensation for absences
A teacher checks the attendance in labs stated in the timetable. The form and the date of the compensation of missed lessons are specified by the teacher.
The study programmes with the given course
Programme M2I-P: Mechanical Engineering, Master's
branch M-TEP: Environmental Engineering, compulsory
Type of course unit
Lecture
26 hours, optionally
Teacher / Lecturer
Syllabus
Noise as a pollutant factor of the living and working environment. Sources of the noise.
Basic concepts and quantities. Sound field and its energy. Analysis of acoustic signals. 1/1 oct and 1/3 oct frequency analysis. Sound propagation in free space and closed area.
Sound field of several sources. Sound power. Directional emission. Noise of air-conditioning machines. Sound mufflers.
Noise reduction of machines. Absorption construction.
Instrument and rooms for measurement of the sound. Actual directives and limits for the noise.
Generation of the vibrations. Basic concepts and quantities of mechanical vibrations. Measurement of vibrations. Sensors and instruments. Diagnostics and monitoring of machines in operation. Measurement of the impact of the vibration on a human.
Methods for reducing vibrations.
Currentl directives and vibrations limits.
Laboratory exercise
13 hours, compulsory
Teacher / Lecturer
Syllabus
Measurement of the traffic noise.
Measurement of the acoustic power of the noise source.
Measurement of the sound isolation characteristics of the construction.
Analysis of the mechanical vibrations of the engine in dependence of operational revolutions.
Influence of the absorption layer on mechanical vibration transmission from noise source to installation pad.