Module Delivered in
| Short Title: | Mechanics 5 |
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| Full Title: | Mechanics 5 |
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| Reviewed By: | FIONA CRANLEY |
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| Description: | The first aim of this subject is to describe and analyse vibrations and their role in mechanical systems. The second aim of the module is to enable the student to examine complete systems, including translational, rotational, and fluid systems. These systems are analysed to enable the student to create mathematical models of the systems. This provides the student with the advanced knowledge and practical skills required to evaluate and analyse complete systems. |
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| Learning Outcomes: |
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| On successful completion of this module the learner will be able to | - Describe simple harmonic motion systems. [POa, POb, POc, POd]
- Analyse the free and damped vibration behaviour of single degree of freedom systems. [POa, POb, POc, POd]
- Analyse forced vibration systems. [POa, POb, POc, POd]
- Calculate the critical speed of rotating shafts and their deflections. [POa, POb, POc]
- Determine the criteria to balance rotating systems and the magnitude and direction of the out of balance forces. [POa, POb, POc]
- An understanding of appropriate safety procedures and standards whilst using laboratory equipment. [POe]
- Describe the general procedure for systems modelling and simulation.
- Classify variables and systems according to type and properties.
- Construct system models using idealised elements.
- Derive mathematical models consisting of ordinary differential equations.
- Arrange mathematical models in a form suitable for solution.
- Solve systems models up to second order using the Laplace transform and it's inverse.
- Identify the limitations of assumptions made in mathematical modelling.
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Module Content & Assessment| Content |
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Free Vibration: (6 hrs) Introduction, Simple Harmonic, Motion Pendulum, Modal Analysis Damped Vibration: (4 hrs) Damped Vibration – single degree of freedom, Viscous Damping & Columb Damping &Log Decrement Forced Vibration: (5 hrs) Theory, Transmission of force Whirling of Shafts: (5 hrs) Theory, Deflection at speeds other than critical. Balancing of Rotating forces: (6 hrs) Static balance, dynamic balance, forces on bearings caused by imbalance. Systems Modelling Overview: (2 hours) System modelling and simulation methodology, model qualification, model verification, model validation. Classification of variables and systems. Types of models. Fluid Systems: (4 hrs) Variables, element laws, dynamic models of hydraulic systems. Translational Mechanical Systems: (8 hrs) Variables, element laws, interconnection laws, free body diagrams, parallel and series element combinations, obtaining system models. Rotational Mechanical Systems: (4 hrs) Variables, element laws, interconnection laws, free body diagrams, obtaining system models. Transform solutions of Linear models: (8 hrs) Laplace transform solutions, transforms of functions, transform properties, transform inversion, solution of 1st and 2nd order models.
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| Assessment Breakdown | % |
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| Course Work | 40% | | End of Semester Formal Examination | 60% |
| | Outcome addressed | % of total | Assessment Date |
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| Formal End-of-Semester Examination | 1,2,3,4,5,7,8,9,10,11,12 | 60% | Semester End |
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| Coursework Breakdown |
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| Type | Description | Outcome addressed | % of total | Assessment Date |
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| Other | Free & Damped Vibration (assessed by individual report) | 2,3 | 10 | Week 4 | | Other | Systems Modelling Lab (assessed by group report) | 9,10,11,12,13 | 10 | Week 6 | | Other | Case Study: System Analysis, Group Project (assessed by report / presentation ) | 8,9,10,11 | 20 | Week 10 |
IT Tallaght reserves the right to alter the nature and timings of assessment Module Workload & Resources| Workload | Full-time |
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| Type | Description | Hours | Frequency | Average Weekly Learner Workload |
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| Lecture | No Description | 4 | Every Week | 4.00 | | Independent Learning | No Description | 4 | Every Week | 4.00 | | Total Weekly Learner Workload | 8.00 | | Total Weekly Contact Hours | 4.00 |
| Resources |
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| Required Book Resources |
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- Ginsberg 2001, Mechanical & Structural Vibrations Theory & Applications, Wiley
- D. H. Bacon, R. C. Stephens 2000, Mechanical Technology,, 3rd Ed Ed., Butterworth-Heinemann
- Charles M. Close, Dean K. Frederick, Jonathan C. Newell,, Modeling and Analysis of Dynamic Systems, WIE 3rd Ed., Wiley [ISBN: 978-0-471-45296-6]
| | Recommended Book Resources |
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- W. Bolton 1997, n/a, Laplace and Z-Transforms Ed., Longman
- Stephens & Hannah 2000, Mechanics of Machines, Arnold
- Ryder & Bennet 1994, Mechanics of Machines, Macmillan
- Nicolae Lobontiu,, System Dynamics for Engineering Students, 1st Ed., Elsevier Academic Press [ISBN: 978-0-240-81128-4]
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