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Modellering av vibrationsdämpare till bilmotorupphängning

Bergdahl, Kristian and Svensson, Mikael (2000) VSM820
Structural Mechanics
Mechanical Engineering (M.Sc.Eng.)
Abstract
The modelling of rubber materials in industrial applications is often carried out by experimental analysis. The company Saab Automobile AB in Trollhättan has assigned the task of simulating the transportation of vibration and noise from the engine of a car to the surrounding structures. The vibration and noise is reduced by the use of vibration dampers made of rubber. The damper is designed as two hollow cylinders, one inside the other, mounted between two cylinders of steel.

The objective of this report is to simulate the characteristics of rubber in a correct way. Of special interest is the nonlinear properties such as nonlinear elasticity and frequency as well as amplitude dependent stiffness. This is carried out by the creation of... (More)
The modelling of rubber materials in industrial applications is often carried out by experimental analysis. The company Saab Automobile AB in Trollhättan has assigned the task of simulating the transportation of vibration and noise from the engine of a car to the surrounding structures. The vibration and noise is reduced by the use of vibration dampers made of rubber. The damper is designed as two hollow cylinders, one inside the other, mounted between two cylinders of steel.

The objective of this report is to simulate the characteristics of rubber in a correct way. Of special interest is the nonlinear properties such as nonlinear elasticity and frequency as well as amplitude dependent stiffness. This is carried out by the creation of one-dimensional rheological models, which simulate the behavior of rubber components. In NASTRAN, these rheological models are placed in different directions in a three-dimensional structure to analyse how the vibrations from the engine transport to the surrounding chassie of the car. The NASTRAN analysis shows that if the engine vibrates with a frequency over 20 Hz the vibration in the surrounding structure will be very small. The eigenfrequency is about 7.5 Hz, which can also be approximately determined by analytical expressions, and at this frequency there will be no damping of the vibrations at all. From the analysis, it is also clear that the amplitude by which the structure is loaded plays an important role in the stiffness response by the rubber component. (Less)
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author
Bergdahl, Kristian and Svensson, Mikael
supervisor
organization
course
VSM820
year
type
H3 - Professional qualifications (4 Years - )
subject
report number
TVSM-5100
ISSN
0281-6679
language
Swedish
id
3566607
date added to LUP
2013-08-05 15:47:21
date last changed
2013-10-07 11:03:10
@misc{3566607,
  abstract     = {{The modelling of rubber materials in industrial applications is often carried out by experimental analysis. The company Saab Automobile AB in Trollhättan has assigned the task of simulating the transportation of vibration and noise from the engine of a car to the surrounding structures. The vibration and noise is reduced by the use of vibration dampers made of rubber. The damper is designed as two hollow cylinders, one inside the other, mounted between two cylinders of steel.

The objective of this report is to simulate the characteristics of rubber in a correct way. Of special interest is the nonlinear properties such as nonlinear elasticity and frequency as well as amplitude dependent stiffness. This is carried out by the creation of one-dimensional rheological models, which simulate the behavior of rubber components. In NASTRAN, these rheological models are placed in different directions in a three-dimensional structure to analyse how the vibrations from the engine transport to the surrounding chassie of the car. The NASTRAN analysis shows that if the engine vibrates with a frequency over 20 Hz the vibration in the surrounding structure will be very small. The eigenfrequency is about 7.5 Hz, which can also be approximately determined by analytical expressions, and at this frequency there will be no damping of the vibrations at all. From the analysis, it is also clear that the amplitude by which the structure is loaded plays an important role in the stiffness response by the rubber component.}},
  author       = {{Bergdahl, Kristian and Svensson, Mikael}},
  issn         = {{0281-6679}},
  language     = {{swe}},
  note         = {{Student Paper}},
  title        = {{Modellering av vibrationsdämpare till bilmotorupphängning}},
  year         = {{2000}},
}