AGUSTIN, ERLANGGA YORDA (2023) IDENTIFIKASI MISFIRING PADA MOTOR TORAK 1000CC DENGAN MENGGUNAKAN ANALISIS HILBERT TRANSFORM. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Misfiring causes abnormalities in piston engines that affect the combustion process. Misfiring is caused by several factors, including damage to the ignition coil, damage to the injector and damage to the spark plug. In this study predicted and analyzed the vibration due to misfiring by conducting a vibration test on a 1000cc motorcycle piston. The data was measured using the accelerometer sensor and the Ono Sokki fft analyzer and then analyzed using the Hilbert transform method. The performance of the motor piston can be predicted normal or abnormal by the vibration method. This can be seen from the change in frequency that occurs. In this research, it is shown that at a rotational frequency of 900 rpm under abnormal conditions, the first shape mode occurs at 69 Hz with an amplitude of . Whereas in normal conditions the first shape mode occurs at a frequency of 99 Hz with an amplitude of . In abnormal conditions known to the occurrence of bearing defects. This is because it occurs 4x rpm. Furthermore, at a rotational speed of 2500 rpm the frequency in shape mode, the first abnormal condition occurs at 69 Hz with an amplitude of . Hilbert Transform analysis obtains an instant frequency of 2900 at 0.001 seconds. While the highest instantaneous frequency occurs in abnormal conditions at 0.0723 seconds. After the frequency is instantaneous, an analysis of the condition of the restore force is carried out. This shows that under normal spring stiffness conditions is obtained. While for abnormal conditions, the spring stiffness value is obtained by the abnormal equation . From the above, it shows that the value of spring stiffness decreases due to misfiring damage. As a result of the spring stiffness value, this abnormal condition causes the frequency to decrease. Keywords: Misfiring; Piston Motor; FFT; Hilbert Transform; Accelerometer Misfiring menyebabkan ketidaknormalan pada mesin torak sehingga mempengaruhi proses pembakaran. Misfiring disebabkan oleh beberapa faktor antara lain kerusakkan pada ignition koil, kerusakkan pada injector dan kerusakkan pada busi. Dalam penelitian ini diprediksi dan dianalisis terhadap getaran akibat misfiring dengan melakukan uji getaran pada motor torak 1000cc. Data diukur menggunakan sensor accelerometer dan alat Ono Sokki fft analyzer kemudian dianalisis menggunakan metode Hilbert transform. Kinerja motor torak dapat diprediksi normal atau tidak normal dengan metode getaran. Hal ini dapat dilihat dari perubahan frekuensi yang terjadi. Dalam penelitian ini diperlihatkan pada putaran 900 rpm frekuensi pada kondisi tidak normal mode shape pertama terjadi pada 69 Hz dengan amplitude . Sedangkan pada kondisi normal mode shape pertama terjadi pada frekuensi 99 Hz dengan amplitude . Pada kondisi tidak normal diketahui terjadinya bearing defect. Hal ini dikarenakan terjadi 4x rpm. Selanjutnya pada kecepatan putaran 2500 rpm frekuensi pada mode shape pertama kondisi tidak normal terjadi pada 69 Hz dengan amplitude . Analisis Hilbert Transform diperoleh instantaneous frekuensi 2900 pada 0.001 detik. Sedangkan instantaneous frekuensi tertinggi terjadi pada kondisi tidak normal saat 0.0723 detik. Setelah dilakukan instantaneous frekuensi maka dilakukan analisis kondisi restoring force. Hal ini menunjukan bahwa pada kondisi normal kekakuan pegas diperoleh . Sedangkan kondisi tidak normal diperoleh nilai kekakuan pegas sebesar persamaan tidak normal . Dari hal tersbut diatas menunjukan bahwa nilai kekakuan pegas turun akibat terjadinya kerusakan misfiring. Akibat nilai kekakuan pegas kondisi tidak normal ini mengakibatkan frekuensi turun. Kata Kunci: Misfiring; Motor torak; FFT; Hilbert Transform; Accelerometer
| Item Type: | Thesis (S1) |
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| Call Number CD: | FT/MSN. 23 100 |
| Call Number: | ST/13/23/052 |
| NIM/NIDN Creators: | 41319110056 |
| Uncontrolled Keywords: | Misfiring; Motor torak; FFT; Hilbert Transform; Accelerometer |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | Annas Tsabatulloh |
| Date Deposited: | 20 Sep 2023 02:03 |
| Last Modified: | 20 Sep 2023 02:03 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/80761 |
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