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Motorcycles
are often used on rough terrains, which result in the need for a thorough
analysis and testing of their suspension systems.
The
figure below (http://www.youtube.com/watch?v=fe9hUW0SN50) shows the suspension of a motorcycle.
To analyze the performance of the system in the lab, the motorcycle is typically
kept in place while a bump is pushed horizontally, opposite to the direction
of motion, under the tire.
Analyze
the system that comprises the rear suspension of a motorcycle that uses this
design and the testing mechanism using the following steps:
- Figure out the length
of all links of the based on the size of a regular motorcycle tire.
- Identify
suitable dimensions to the exciting object to simulate the largest
possible bump that the motorcycle will go over. Similarly, identify a possible
spring. We are not concerned with
the shock absorber at this stage.
- Identify the loops and
joints. Assume that the tire is
rigid.
- Calculate the degree
of freedom of the system.
- Identify the input
link.
- Use Working Model or SolidWorks to study this system.
- Identify the ranges of
the motion of every link.
- Is the performance of
the suspension system satisfactory? Based on the results of the previous
step, discuss possible modifications for the system to meet your design
objectives. Compare the two designs.
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