ES386-15 Dynamics of Vibrating Systems
ES386-15 Dynamics of Vibrating Systems
Vibrations exert a significant influence on the performance of the majority of engineering systems. All engineers should understand the basic concepts and all mechanical engineers should be familiar with the analytical techniques for the modelling and quantitative prediction of behaviour. Thus, this module provides students with fundamental skills necessary for the analysis of the dynamics of mechanical systems, as well as providing opportunities to apply these skills to the modelling and analysis of vibration.
This third-year module is mandatory for students pursuing a degree in Mechanical Engineering, building upon competences acquired earlier in the course. This module introduces students to the use of Lagrange’s equations (applied to 1D and 2D systems only for this module) and to techniques for modelling both lumped and continuous vibrating systems. It includes some coverage of approximate methods both as an aid to physical understanding of the principles and because of their continuing usefulness. The module assumes basic understanding of mechanics and linear algebra consistent with the level of Year 2 modules.
At the end of the module students should have a sound understanding of the wide application of vibration theory and of the underlying physical principles. In particular, they should be able to use either Newtonian or Lagrangian mechanics to analyse 2D systems, and to determine the response of simple damped and undamped multi-degrees of freedom (DOF) systems to both periodic and aperiodic excitation. They should also be familiar with engineering solutions for measuring and influencing vibrational behaviour.
This is an indicative module outline only to give an indication of the sort of topics that may be covered. Actual sessions held may differ.
- Generalised co-ordinates, Lagrange's equation (including preliminary study of other classical methods)
- General application of the Lagrange equation to vibrating systems
- Multi-degree of freedom systems: lumped system models, continuous system models; geared and branched systems; reduction of an n-DOF system to a set of n single-DOF systems; principal co-ordinates
- Matrix methods of analysis: conservative and non-conservative (damped) systems; determination of principal co-ordinates
- Modelling of damping: hysteretic, Coulomb, viscous; measurement of damping factor
- Forced vibration: harmonic excitation of multi-DOF systems; shaft whirling; transmissibility; vibration isolation; non-harmonic and arbitrary excitation (convolution integral)
- Approximate methods e.g. Rayleigh's method, Dunkerley's method
By the end of the module, students should be able to:
- 1. Model planar mechanical systems using Newton’s and Lagrange’s equations: Determine appropriate co-ordinate systems, analyse vibrations.
- 2. Abstract more complex engineering mechanisms: analyse using lumped system models or simple distributed mass and stiffness models. Use and justify standard methods and approximations for extended and continuous vibrating systems.
- 3. Evaluate the natural frequencies and modes of vibration of a multi-degree of freedom linear system.
- 4. Determine and analyse the free and forced response of single-degree of freedom systems to periodic and aperiodic excitation, as well as the effects of linear and non-linear damping on the system behaviour.
- 5. Evaluate complex (multi-degree of freedom) undamped or damped systems numerically, using a systematic approach to analyse the natural frequencies and modes, and the response of the system to periodic and aperiodic excitations.
- 6. Demonstrate a sound understanding of the application of vibration analysis to key engineering systems.
Indicative reading list
- Theory of Vibration with Applications, by W. T. Thomson and M. D. Dahleh. Publisher: Pearson. Fifth edition, 1998. ISBN-10: 013651068X, ISBN-13: 9780136510680.
- Principles of Vibration, by B. H. Tongue. Publisher: Oxford University Press. Second edition, 2002. ISBN-10: 0195142462.
- Engineering Vibrations, by D. J. Inman. Publisher: Pearson. Fourth international edition, 2013. ISBN-10: 0273768441, ISBN-13: 9780273768449.
- Mechanical vibrations, by S. S. Rao, Fook Fah Yap. Publisher: Prentice Hall. Fifth edition in SI units, 2011. ISBN-10: 9810687125, ISBN-13: 9789810687120
- Vibrations, by B. Balachandran, E. B. Magrab. Publisher: Cengage. Second international SI edition, 2009. ISBN10: 0495411256, ISBN-13: 9780495411253.
Subject specific skills
SSS4: Ability to apply relevant practical and laboratory skills.
SSS8: Ability to be pragmatic, taking a systematic approach and the logical and practical steps necessary for, often complex, concepts to become reality.
TS1: Numeracy: apply mathematical and computational methods to communicate parameters, model and optimize solutions.
TS2: Apply problem solving skills, information retrieval, and the effective use of general IT facilities.
TS3: Communicate (written and oral; to technical and non-technical audiences) and work with others.
TS7: Overcome difficulties by employing skills, knowledge and understanding in a flexible manner.
|Lectures||30 sessions of 1 hour (20%)|
|Seminars||2 sessions of 1 hour (1%)|
|Practical classes||1 session of 2 hours (1%)|
|Private study||86 hours (57%)|
|Assessment||30 hours (20%)|
Private study description
Guided independent learning, assignment preparation, etc 86 hours.
No further costs have been identified for this module.
You must pass all assessment components to pass the module.
Students can register for this module without taking any assessment.
Assessment group C
|Vibration analysis computational project||20%|
Matlab code submitted on Matlab Grader (50%) and a brief computational report (500 words, 50%)
In-depth vibrational analysis of a systemt in an 8-page written report.
|Online Examination||50%||30 hours|
~Platforms - AEP,QMP
Feedback on assessment
- Feedback during laboratory sessions
- Feedback on assignments.
- Model solutions to exam type questions.
- Support through advice and feedback hours.
- Cohort level feedback on examinations
To take this module, you must have passed:
This module is Core for:
- Year 3 of UESA-H310 BEng Mechanical Engineering
- Year 3 of UESA-H315 BEng Mechanical Engineering
- Year 4 of UESA-H314 BEng Mechanical Engineering with Intercalated Year
- Year 3 of UESA-HH35 BEng Systems Engineering
- Year 3 of UESA-HH36 BEng Systems Engineering
- Year 4 of UESA-HH34 BEng Systems Engineering with Intercalated Year
- Year 3 of UESA-H311 MEng Mechanical Engineering
- Year 3 of UESA-H316 MEng Mechanical Engineering
- Year 4 of UESA-H317 MEng Mechanical Engineering with Intercalated Year
- Year 3 of UESA-HH31 MEng Systems Engineering
This module is Core optional for:
- Year 3 of UESA-H115 MEng Engineering with Intercalated Year
UESA-H317 MEng Mechanical Engineering with Intercalated Year
- Year 3 of H317 Mechanical Engineering with Intercalated Year
- Year 4 of H317 Mechanical Engineering with Intercalated Year
- Year 4 of UESA-HH32 MEng Systems Engineering with Intercalated Year
This module is Optional for:
- Year 3 of UESA-H113 BEng Engineering
- Year 3 of UESA-H114 MEng Engineering
- Year 4 of UESA-H115 MEng Engineering with Intercalated Year
This module is Option list A for:
- Year 4 of UESA-H111 BEng Engineering with Intercalated Year
UESA-H112 BSc Engineering
- Year 3 of H112 Engineering
- Year 3 of H112 Engineering