Course detail
Dynamics IV - Selected Chapters
FSI-RRSAcad. year: 2022/2023
In the course the students will be acquainted with the basic dynamic properties and dynamic behavior of the components and parts of rotor systems. Specifically, with the shaft, non-linear constraints between the rotating and non-rotating parts, turbine and compressor blades and disks. Special attention is paid to the rotor eigen frequencies, mode shapes and critical speed prediction. Some tasks can be computationally demanding, especially in the time domain solutions. Therefore, the students will be introduced to methods of reducing degrees of freedom. The course will also pay attention to vibrations and noise, which are accompanying phenomena of working processes of all machinery. The course is focused on the basics of acoustics, measurement of acoustic quantities and computational modeling of vibroacoustic systems. In the exercises students will be introduced to the solution of vibroacoustic problems using numerical methods. In addition, students will be introduced to optimization methods.
Language of instruction
Number of ECTS credits
Mode of study
Guarantor
Learning outcomes of the course unit
Prerequisites
Co-requisites
Planned learning activities and teaching methods
Assesment methods and criteria linked to learning outcomes
Active participation in seminars, obtaining at least 20 points of 40 possible, which can be obtained by elaborating partial tasks and their presentations and passing two seminar tests of the basic knowledge and solution of typical tasks from profiling areas of the subject (at least 30 points out of 60 must be gained). The specific form of the tests, types, number of tasks or questions and details of the assessment will be given by the lecturer during the semester. The final evaluation is given by the sum of the point according ECTS. For successful completion of the course it is necessary to obtain at least 50 points.
Course curriculum
Work placements
Aims
Specification of controlled education, way of implementation and compensation for absences
Recommended optional programme components
Prerequisites and corequisites
Basic literature
Gasch, Pfutzner: Dynamika rotorů, SNTL Praha, 1980.
Recommended reading
Lyon, R. H., DeJong, R.G: Theory and Application of Statistical Energy Analysis, Butterwortth-Heinemann, Boston, 1995
Mišun, V.: Vibrace a hluk, Vysoké učení technické , Brno, 1998
Ohayon, R., Soize, C.: Structural Acoustic and Vibration, Academic Press, London, 1998
Elearning
Classification of course in study plans
Type of course unit
Lecture
Teacher / Lecturer
Syllabus
2. Undamped Laval (Jeffcott) rotor in rigid and flexible bearing supports
3. Laval (Jeffcott) rotor with external and internal damping. Roro stability
4. Joints between rotating and non-rotating parts (bearings, shock absorbers, sealing joints).
5. Vibration of bladed disks, Campbell diagram
6. Vibration of the non-attenuated rotor taking into account gyroscopic effects,
7. Rotor balancing
8. Methods of reduction of dynamic systems
9. Acoustic quantities, wave equation and its solution, mechanical and aerodynamic noise sources
10. Measurement of acoustic quantities
11. Deterministic models of vibroacoustic systems: finite element method (FEM), boundary element method (BEM)
12. Statistical models of vibroacoustic systems (statistical energy analysis SEA), hybrid models (FEM + SEA)
13. Optimization
Computer-assisted exercise
Teacher / Lecturer
Syllabus
2. Simulation of starting of electric motors in time domain
3. Simulation of electric motor start in frequency domain
4. Simulation of rotor bearing behavior
5. Vibration of disks and bladed disks
6. Modeling of bladed disks using cyclic symmetry
7. Effect of nonlinearities in bladed discs dynamic behavior
8. Degrees of freedom reduction: Examples in MATLAB, MSC Adams and ANSYS
9. Propagation of acoustic waves in free and enclosed space
10. Radiation of acoustic waves from vibrating body to free space, radiated acoustic power
11. Propagation of acoustic waves from a vibrating body into a acoustic cavity
12. Transmission of acoustic waves across different types of walls
13. Application of selected optimization methods
Elearning