|dc.contributor.author||Miralles Pérez, Antono||
|dc.description.abstract||A test of a device equivalent to a Girling duo-servo brake mechanism has been
made. The main result is the characterization of a series of frequency associated
to the system. The frequency in the spectrum that matches with the belt’s turn
frequency is the clearest relation response excitation. The excitation source is related
to two small notches on the surface of the belt. A frequency bandwidth with
a main frequency, which has no relation to the natural frequencies of the system,
is present in each spectrum and is related to non-linear friction phenomenon.
Several probes have been studied to find the best solution, which is obtained
with the laser distance sensor. Even using this sensor, the block’s displacement in
the workbench is greater than the probe’s measure threshold in some assemblies.
Several belts have been tested and the belt with smoother notches has been selected.
Another source of instability comes from the necessary velocities used in
the test. These force the electric motor to run at very low velocity that produces
instabilities that has been considered in the analysis results. Amid the recommendations,
it would be suitable get a belt without notches and another driver.
In the present work the following tests has been developed with three springs
set. With a set of 0.14 N/mm stiffness springs, tests have been completed at 20, 15
and 10 rpm. With a set of 0.34 N/mm stiffness springs, tests have been completed
at 20, 15, 10 and 5 rpm. With a set of 0.14 and 0.34 N/mm, a test has been
completed at 5 rpm.
For measures related to the set of 0.14 N/mm stiffness springs, the lower angular
velocity is, the more chaotic the system’s behaviour is. For measures related
to the set of 0.34 N/mm stiffness springs, the higher angular velocity is, the more
chaotic the system’s behaviour is. For the measure related to the set of hybrid
springs, the phase’s plane space shows an area which has not relation to stick phenomenon
owing to a negative slope, instead of the positive slope associated to the
stick. A comparison of the results at 10 rpm for both kinds of springs sets, 0.14
and 0.34 N/mm, shows the stiffer springs are, the more chaotic behaviour is.||es_ES
|dc.rights||Atribución-NoComercial-SinDerivadas 3.0 España||*
|dc.title||Analysis of dry friction by friction test bench||es_ES
|dc.contributor.advisor||Moreno Nicolás, José Andrés||
|dc.contributor.advisor||Marín García, Fulgencio||
|dc.description.centro||Escuela Técnica Superior de Ingeniería Industrial||es_ES
|dc.description.university||Universidad Politécnica de Cartagena||es_ES