1,721,026 research outputs found
A vibration absorber for motorcycle handles
Full text linkThis paper describes the application of a vibration absorber to ameliorate the comfort of motorcycle handles. The concept of dynamical absorber is briefly summarised and a frequency response function is expressed as the ratio of vibration amplitudes (transmissibility).
Some practical hints on the tuning strategy are also suggested in order to correctly define the absorber and then achieve the most effective vibration reduction. A specifically designed item is presented, with the peculiar characteristic of taking advantage of the damping properties of viscoelastic material undergoing shear deformations. An experimental verification of the good performances of the absorber is eventually given on the basis of both a modal analysis of a motorbike and the testing of its handle on an electrodynamical shaker
Experimental identification of non-linear parameters over a scaled multi-storey building
No full text
ISWEC: DESIGN OF A PROTOTYPE MODEL FOR WAVE TANK TEST
No full textThe extraction of energy from ocean waves has been
investigated in Europe since the 1970s. During the research
process hundreds of devices have been proposed and a few of
them have been built full scale and deployed to the ocean.
Unlike other renewable energies, so far there has not been a
device standing out to be the most suitable to exploit wave
power. One of the practical problems to be solved in a Wave
Energy Converter (WEC) is durability in the harsh marine
environment. This could be critical if parts of the converter such
as turbine rotors or auxiliary floats are needed to move or to
react while exposed to seawater and spray. One method to solve
the problem is to use a WEC composed just by one sealed
floating body carrying a gyroscope. The inertial effects of the
gyroscope are activated by the float motion and are used to
drive a generator. The whole system operates in the clean
environment inside the float. In this work a procedure to design
the ISWEC device (Inertial Sea Wave Energy Converter) is
outlined. The mechanical equations describing the system are
linearized, studied in the frequency domain and used as a
mathematical tool in the design process. The method is then
applied iteratively to design a scaled prototype model to be
tested in the wave tank at the University of Naples. The final
version of the prototype model is then scaled up to evaluate the
performances of a full scale device
EXPERIMENTAL TESTING ON A ONE DEGREE OF FREEDOM WAVE ENERGY CONVERTER CONCEIVED FOR THE MEDITERRANEAN SEA
No full text
- …
