Analisis Modal Raket Tenis Wilson Tergantung Bebas dengan Peredam Tipe-1 dan Tipe-2
Abstract: One way that can be
used to analyze vibration in structures is the modal method of analysis. With
this method vibration can be measured when the structure is working, so get the
form of vibration mode and vibration valueswith different frequency levels. If
the frequency of the structure in operation is known, then the structure can becontrolled
so that it does not work on its private frequency, so that the vibrations that
occur in the structure are at a safe level. The objective of this research is
to know the mechanism of reconstruction of disturbance force ontennis racket
structure that vibrates and determines the personal frequency through the test.
Then determine the time-frames style graph. In testing, the Wilson brand test
racket was given a type 1 and type 2 damper with a weight of 320 grams and a
697mm long vertical hanging with a free-to-pedestal condition. After the
software was run, an excitation style with impact hammer was applied to the top
of the racket. Measurement of response is done by recording FRF (frequency
domain) and coherence graph. The sampling results are stored in * .txt
extensioned files and processed with microsoft excel to get real FRF and
imaginary FRF graphics. The test is done several times by varying the
accelerometer position of 8 points and 2 types of silencer. From the capital
test the analysis of the specimen is hung freely with the silencer, then
obtained the personal frequency of the test racket with alower silencer than
the personal frequency of the system without damper with a difference of 2 Hz.
The three lowest vibration modes of the free-hanging system of the experimental
results are the first mode of a half-wave graph forming a peak, the second mode
being a one-wave graph forming a single valley peak, and the third mode being a
one-and-a-half wave graph of the two valleys. The damping of the test structure
is different at each test point and at any given frequency range.
Penulis: Rozi Saferi, Ismet
Eka Putra
Kode Jurnal: jptmesindd160593