Reducing the vibrations in Scania’s test cells
(2016) In Diploma work MME820 20161Machine Elements
- Abstract
- This thesis aims to present different ways of handling the vibrations for large displacement single cylinder engines (test beds). These test beds are used for development purposes at Scania. The imbalances causing the vibrations are discretized which are then suppressed using counter weights and carefully designed balance shafts. It is found that with some unconventional designs, balance shafts can be used to suppress both oscillating forces and moments. The moment balancing is restricted to a single load condition and engine speed. By dimensioning these shafts with respect to engine assembly’s critical speeds, an engine speed range completely free from resonance behaviour can be achieved. Various balancing measures are presented using... (More)
- This thesis aims to present different ways of handling the vibrations for large displacement single cylinder engines (test beds). These test beds are used for development purposes at Scania. The imbalances causing the vibrations are discretized which are then suppressed using counter weights and carefully designed balance shafts. It is found that with some unconventional designs, balance shafts can be used to suppress both oscillating forces and moments. The moment balancing is restricted to a single load condition and engine speed. By dimensioning these shafts with respect to engine assembly’s critical speeds, an engine speed range completely free from resonance behaviour can be achieved. Various balancing measures are presented using numerical simulation from analytically derived equations.
Different types of engine mounts are also studied and evaluated from the test bed perspective. It is shown that the active engine mount systems offers benefits over other engine mount designs. While these systems may be costly and troublesome to implement to road vehicles, several aspects can be identified for the test beds offering cheaper and less complex implementation. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8626495
- author
- Sjöholm, Johan LU
- supervisor
- organization
- course
- MME820 20161
- year
- 2016
- type
- H2 - Master's Degree (Two Years)
- subject
- publication/series
- Diploma work
- language
- English
- id
- 8626495
- date added to LUP
- 2016-02-15 13:52:53
- date last changed
- 2016-02-15 13:52:53
@misc{8626495, abstract = {{This thesis aims to present different ways of handling the vibrations for large displacement single cylinder engines (test beds). These test beds are used for development purposes at Scania. The imbalances causing the vibrations are discretized which are then suppressed using counter weights and carefully designed balance shafts. It is found that with some unconventional designs, balance shafts can be used to suppress both oscillating forces and moments. The moment balancing is restricted to a single load condition and engine speed. By dimensioning these shafts with respect to engine assembly’s critical speeds, an engine speed range completely free from resonance behaviour can be achieved. Various balancing measures are presented using numerical simulation from analytically derived equations. Different types of engine mounts are also studied and evaluated from the test bed perspective. It is shown that the active engine mount systems offers benefits over other engine mount designs. While these systems may be costly and troublesome to implement to road vehicles, several aspects can be identified for the test beds offering cheaper and less complex implementation.}}, author = {{Sjöholm, Johan}}, language = {{eng}}, note = {{Student Paper}}, series = {{Diploma work}}, title = {{Reducing the vibrations in Scania’s test cells}}, year = {{2016}}, }