• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.8 no.4
• /
• pp.826-831
• /
• 2007

Analytic solutions for pile driving system with and without suspension were presented and influences of suspension on the driving system were discussed. According to the results of analysis, magnitude of amplitude of vibratory pile driver with suspension increases as the mass of the suspension increases and soil dampening decreases. As a results of comparing power of vibratory pile driver with suspension with that of design criterion, power versus soil dampening reaches a peak value and then declines. The maximum power increases with mass ratio and the power is always below that of the Vulcan design criterion.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.39 no.1
• /
• pp.45-53
• /
• 2015

Large-capacity of household washing machine can become unbalanced during the dehydration process. To solve this problem, several types of suspensions have been installed in a washing machine. In this study, physical tests were carried out on a frictional suspension, and the nonlinear characteristics were modeled by combining several simple physical models. The parameters were estimated based on the least squares solution. The simulation and test results were compared to verify the validity of the friction damper model.