| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 87 === This article focuses on the investigation of the properties of the single-piston and multi-piston fluid damper in high frequency motion. Dynamic tests in relatively high velocity were also performed to understand detailed properties of damper with various cross sectional area. Additional tests were performed to observe the relationship between the efficiency decay of fluid damper with respect to the temperature change.
Testing results were analyzed, with conclusions as follows:
1. Temperature is one of the major factors which affects the efficiency of fluid damper. When fluid damper operates, the fluid temperature increases continuously, which makes the efficiency decay for fluid dampers. Eventually, the damper reaches a stable state, that is, temperature does not increase, and the damping factor does not decrease.
2. Proven by the test results, the damping factor and stiffness of the damper are dependent to the frequency of motion. For the higher frequency of motion, the stiffness of the damper gets higher, while the damping factor gets lower.
3. The damping factor of the damper rises as the pieces of piston increased. However, the test results show that the damping factor does not increase proportionally by the number of pistons.
4. The testing results of the dampers with various cross sectional area show that as the piston move into the section of smaller area from the section of large area, damping factor increases with a linear function instead of a state function.
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