In this paper, a passive damper based on energy dissipation through shock and dry friction (shock-friction damper) is investigated regarding its design effectiveness for damping self-excited torsional vibrations similar to those occurring in deep drilling. The results are compared the of conventional dampers. different operational drilling parameters that change during process, such as weight b...

Human gait is characterized by periodic repetitions of two phases: a stance phase in which a foot is in contact with the ground, followed by a swing phase in which the lower limb swings through after toe-off. The functional necessities of above-knee prostheses are to provide knee locking during the stance phase and damping during the swing phase. Most of the conventional above-knee prostheses a...

This study aims to develop a knee-brace friction damper for mid-rise timber frame buildings. First, time history seismic response analysis was conducted investigate the performance of improve four-story building. Then, static cyclic loading test on beam-column joint with/without prototype carried out verify effectiveness damper. It is found that mitigates slip behavior and increases equivalent ...

braced frames structures have a good lateral stiffness against earthquakes. however, energy loss of their members is slight and strong forces are given to the structures. moment frames have a more flexible function against earthquakes and also have a better flexibility than braced frames. however, since its lateral stiffness is low, too much displacement of the structure results in an increase ...

dynamic behavior of the wind-excited-benchmark-building using semi-active electromagnetic friction dampers (saemfds), with modulated homogeneous friction algorithm is presented. the performance of the benchmark building is studied under across wind loads by installing the saemfds with smooth boundary layer semi-active friction (sblsaf) algorithm. the governing equations of motion are solved by ...

Use as an elastic body of the working fluid improves efficiency hydraulic damper, reliability, and durability, in this case, issues improving reliability existing locomotives dampers by upgrading separate components for major repairs with extension useful life are relevant. To increase damping dynamic vibrations reduce load on support units running gear elements, a modernized design hydro frict...