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All Journal Sinergi FLYWHEEL : Jurnal Teknik Mesin Untirta JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) JTTM: Jurnal Terapan Teknik Mesin Automotive Experiences AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin

Subekti Subekti

Universitas Mercu Buana

Author-ID : 2082892

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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IMPLEMENTATION OF FREQUENCY RESPONSE FUNCTION ON TAPPER BEARING MAINTENANCE Ari Susanto; Setyo Qomarudin Yusuf; Abdul Hamid; Haris Wahyudi; Subekti Subekti
SINERGI Vol 23, No 2 (2019)
Publisher : Universitas Mercu Buana

Bearing acts as a pad that supports a shaft to rotate without excessive friction, hold the radial load and maintain the motion towards the left and right shafts (Thrust Load) when turning together. Due to frequent taper bearing damage to the wheels, predictive maintenance is therefore necessary. One of the predictive maintenance methods widely used today is vibration analysis. The principles of vibration-based bearing damage detection using the Frequency Response Function (FRF) method will be shown in this paper. Harmonics signal is given to the bearing surface in a vertical or perpendicular direction to the taper bearing surface. The vibration response measurement was carried out on three axes (x, y, and z). The results of this study indicated the ability of FRFs to predict any damage on the bearing taper.

INSPECTING A BUMP TEST IN THE MAINTENANCE OF A 1200-CC DAIHATSU SIGRA DISC BRAKE Subekti Subekti; Abdul Hamid; Basuki Dwi Effendy; Agung Wahyudi Biantoro
SINERGI Vol 23, No 3 (2019)
Publisher : Universitas Mercu Buana

A motorized vehicle needs a system that can not only reduce the speed and stop the vehicle but can also serve as a safety tool and ensure a safe distribution which is called a braking system. It is important to conduct maintenance of a disc brake that is part of the braking system. Therefore, this study developed a technique to inspect a 1200-cc Daihatsu Sigra disc brake through the vibration measurement using a bump test. A disc brake is comprised of three fields: A (located next to the center of the disc brake), B ( in the middle diameter), and C ( in the outer diameter of the disc brake). Each field has ten measurement points. This study showed that disc brake damages occurring in field A were at points 1-3, and they appeared after the 250-Hz frequency. Meanwhile, in fields B and C, at all measurement points, there were no changes taking place at any frequency.

DYNAMIC CHARACTERIZATION OF BALL BEARING IN TURBINE PROPELLER USING BUMP TEST METHOD Monika Audiya Pratiwi; Muhammad Ikhsan; Rio Duzan Octavianto; Abdul Hamid; Subekti Subekti
SINERGI Vol 25, No 2 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2021.2.004

Bearing is an essential component in a mechanical rotating equipment system. It is no less important than lubrication to prevent wear is very important to consider in the mechanical maintenance system of rotating equipment. Bearing wear is one of the problems in wind turbines that will increase maintenance costs, shorten the wind turbines' lifespan, and cause the component or overall damage to the wind turbine. The latest technology has provided instruments for analyzing the damage of elements in a bearing according to the caused vibrations. Therefore, this study was performed on Ball Bearing Turbine Propeller to identify the dynamic characteristics of Ball Bearing with and without lubrication. The test was carried out using the Bump Test method applied in three measured parts: X, Y, and Z axes. The measuring instrument which was used was Fast Fourier Transform (FFT) Analyzer (Ono Sokki) and the data were analyzed using MATLAB. It was identified that the application of oil could reduce the amplitude and decrease the frequency. Personal frequency appearing more than once indicates the existence of global vibration modes. The frequency which only appears once in the measurement spot indicates local vibration modes. The highest frequency both after and before the application of oil was found in the Y-axis.

STUDYING THE DYNAMIC CHARACTERISTICS TO LENGTHEN THE OPERATING LIFE FOR A DIESEL ENGINE USING FREQUENCY RESPONSE FUNCTION (FRF) MEASUREMENT Subekti Subekti
SINERGI Vol 22, No 3 (2018)
Publisher : Universitas Mercu Buana

This research was conducted on Diesel engine single cylinder which aims to study the dynamic characteristics of Diesel engine type HATZ 1D 80 made in Germany. The test was performed by measuring the Frequency Response Function (FRF). In this study, the vibration response was measured at three points: point A which was situated below the engine shaft and in line with the stinger. Point A indicated the FRF point. Point B was located in the valve train component, while point C was situated above the cap of the valve train component. The range of frequencies applied was 0 - 3200 Hz, 3200 - 6400 Hz, 6400 - 9600 Hz, and 9600 - 11200 Hz. This research indicates that the natural frequencies arose because of the global vibration mode. The global vibration mode occurred at natural frequencies of 3118, 4805, 4821, 5021, 7129, 8601, and 11107 Hz. While other natural frequencies were associated with the local vibration mode because it appears only at one point of measurement.

Karakteristik Dinamik Disc Brake Daihatsu Sigra 1200 cc dengan Metode Bump Test subekti bekti
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume V Nomor 1, April 2019
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v0i0.3947

Penelitian ini dilakukan pada sistem disc brake Daihatsu Sigra dengan silinder 1200 cc. tujuan makalah ini adalah untuk mengetahui karakateristik dinamika pada sistem disc brake Daihatsu Sigra buatan pabrik mobil di Indonesia. Pengujian dilakukan dengan pengukuran metode bump test. Pada penelitian ini, response getaran diukur dengan menggunakan sensor accelerometer pada tiga puluh titik yang dibagi kedalam tiga bagian yaitu diameter dalam (bagian A), diameter tengah (bagian B), dan diameter luar (bagian C). gaya eksitasi dilakukan dengan mengunakan metoda bump test, pada pada titik yang sama. Rentang frekuensi yang digunakan adalah 1 – 1000 Hz. Pada penelitian ini, Terdapat frekuensi pribadi yang muncul lebih dari satu titik pengukuran. Hal ini menunjukan adanya modus getar global. Modus getar global terjadi pada frekuensi pribadi 40 Hz, 53 Hz, 62 Hz, 116 Hz, 123 Hz, 304 Hz, dan 557 Hz Sedangkan frekuensi pribadi yang lain berkaitan dengan modus getar lokal, karena hanya muncul pada satu titik pengukuran saja.

Hilbert Transform Analyzer for Mechanical Fault Detection of Vehicle Alternators Subekti Subekti; Muhammad Nurul Hidayat; Basuki Dwi Efendi; Abdul Hamid; Alim Murwanto
Automotive Experiences Vol 3 No 3 (2020)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Checking the alternator with mechanical measurements of moving parts takes sufficient time, especially in compact design engines. Therefore, this article presents a new method for alternator fault detection using the Hilbert transform application. The instantaneous amplitude and frequency are used as input variables for fault detection. Joint time-frequency analysis based on the wavelet analysis is also applied to identify the nonlinear characteristics. Various wavelet functions are examined, and some recommendations regarding the most suitable ones and the interpretation of the results are discussed. As a result, the backbone curve obtained from the instantaneous amplitude and frequency demonstrates the presence of the nonlinear phenomena, which can help make decisions about an alternator in normal conditions or indicate fault detection. From the test results, this method is very promising to be applied as part of vehicle's preventive maintenance.

Measurement of Vibration on The Alternator Due to The Influence of Rotation Speed Subekti Subekti; Hadi Pranoto; Muhammad Nurul Hidayat; Basuki Dwi Efendy
International Journal of Advanced Technology in Mechanical, Mechatronics and Materials Vol 2, No 1 (2021)
Publisher : Institute for Research on Innovation and Industrial System (IRIS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37869/ijatec.v2i1.44

The alternator or dynamo ampere is a device that functions as a generator that produces alternating current (AC) and converts it to direct current (DC). Signs of damage that often occur due to damage to the Alternator are the smell of burning, squeaking, dim spotlights, indicator lights, malfunction of the battery, and the supply of electricity. These signs will cause the vehicle to stop in the middle of the trip the electricity supply is very lacking. This requires that preventive maintenance checks on the alternator are a must in the automotive world. In this paper we research measuring the vibration of the alternator due to the influence of rotation speed (750 rpm and 1800 rpm), to predict damage to the alternator of the Daihatsu Luxio vehicle. The results of this study indicate that at the rotational speed of 750 rpm and 1800 rpm, were found 1x rpm the condition of the vibration amplitude on the alternator is smaller than the alternator in poor condition, this is due to the presence of an unbalanced alternator. Also, vibration due to misalignment is obtained because it has characteristics, among others: vibrations with a frequency of 1xRPM and/or accompanied by a relatively large 2xRPM, and relatively high vibration in the axial direction.

Analysis of the vibration caused by porting on the intake and exhaust channels of a 150 cc Kawasaki Ninja driver Eko Saputra Eko Saputra; Subekti Subekti; Tulus Supriyanto
JTTM : Jurnal Terapan Teknik Mesin Vol 4 No 1 (2023): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Sekolah Tinggi Teknologi Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v4i1.359

Motorcycle vehicles are very popular because they are easy to maneuver and fast, so they are the most popular in various aspects of transportation in urban areas. However, motorbike drivers get tired easily. Acute fatigue, fatigue, chronic sleepiness, sleep disturbances, and heavy workloads have been associated with reduced performance in psychomotor tests and driving simulators and increased rates of motor vehicle crashes, injuries and deaths in certain populations. One that must be considered is the spread of vibrations originating from the piston motor. This is due to vibrations occurring in the work environment and distributed to the body of the workforce or objects in the workplace or work environment throughout the body in the form of mechanical vibrations originating from machines or mechanical equipment. Therefore, the purpose of this study will be to determine the effect of port placement on the intake and exhaust channels on vibrations throughout the body (Whole Body Vibration). Tissue resonance throughout the human body causes health problems. The standard or threshold value for the whole body vibration level that applies at the international level refers to ISO 2631. The test results on the driver’s arm with a rotational speed of 9900 rpm at the standard obtained a frequency of 6 Hz and an amplitude of 0.911137 mm/s2, after porting, the frequency is 7 Hz and the amplitude is 0.771992 mm/s2. Meanwhile, on the driver’s feet with a rotational speed of 9900 rpm, the standard obtained a frequency of 3 Hz and an amplitude of 12.0214 mm/s2, after porting a frequency of 3 Hz and an amplitude of 18.6765 mm/s2 was obtained. The results of this study can be concluded that the use of ports on motorbikes will cause riders to experience fatigue more quickly than standard motorbikes. Because the average ported has a greater amplitude than the standard conditions

Pengaruh Reed Valve Dengan Variasi Dual Stage Terhadap Torsi, Horsepower Dan Konsumsi Bahan Bakar Pada Kendaraan Dua Langkah Yamaha RXK 135 Suryawan Wicaksono; Subekti
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2023)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar

Motor bensin merupakan salah satu jenis motor pembakaran dalam yang digunakan untuk menggerakkan atau sebagai sumber tenaga dari suatu kendaraan. Optimalisasi pada proses sebelum pembakaran dapat meningkatkan performa mesin seperti melakukan pergantian pada komponen reed valve. Reed valve atau katup buluh bekerja berdasarkan kehisapan pada ruang engkol dan mekanisme yang tidak terhubung dengan putaran mesin. Penelitian ini dilakukan untuk mengetahui pengaruh reed valve standar dan dual stage reed valve terhadap torsi, horsepower, konsumsi bahan bakar pada sepeda motor Yamaha RXK 135 cc. Penelitian ini menggunakan metode eksperimental dimana pengujian dilakukan secara bergantian untuk masing-masing variasi reed valve untuk memperoleh torsi, horsepower, dan konsumsi bahan bakar menggunakan Pertalite. Pengujian dilakukan pada tingkat putaran mesin 6800-16000 rpm menggunakan mesin dynotest di Alonso Lee Motor Workshop. Hasil penelitian menyimpulkan bahwa torsi dan daya tertinggi didapatkan oleh lidah membran standar dengan nilai 18,91 HP pada 9500 rpm dan 14,7 N.m pada 8450 rpm sedangkan pada lidah membran dual stage menghasilkan torsi dan daya sebesar 18,38 HP pada 14500 rpm dan 9,49 N.m pada 12540 rpm. Hal tersebut dikarenakan bahan dari lidah membran dual stage yang lebih kaku. Sehingga membuat penghisapan bahan bakar kurang responsif dibandingkan dengan lidah membran standar yang berbahan lebih lentur sehingga mampu melakukan penghisapan bahan bakar lebih cepat dan mengoptimasi kinerja mesin. Kata kunci : katup buluh; membran; mesin dua langkah; yamaha RX king.

Pemanfaatan Limbah Kantin Sekolah Menjadi Pupuk Organik Sebagai Teknik Pengolahan Sampah di Sekolah Nur Indah; Darwin Sebayang; Rita Sundari; Subekti Subekti; R. Ariosuko; Fajar Anggara; Gian Villany Golwa
JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) VOL. 8 NOMOR 2 JULI 2024 JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat)
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jppm.v8i2.21272

Tujuan kegiatan ini adalah untuk keterampilan dan kemampuan dalam pembuatan pupuk organik cair pada siswa SMKN 35, dalam rangka mengurangi pencemaran lingkungan akibat limbah kantin disekolah. Pelatihan ini terdiri dari dua bagian, yaitu indoor dan outdoor. Dalam indoor diberikan materi mengenai proses dan prosedur pembuatan sampah menjadi pupuk cair. Sedangkan outdoor melakukan praktek cara pembuatan tabung composer dan cara pembuatan pupuk organik cair dari limbah yang berasal dari kantin dan buah-buahan yang busuk. Sehingga siswa-siswi SMKN 35 dapat memperoleh pengetahuan dan keterampilan cara membuat pupuk cair organik dari limbah kantin dan buah-buahan busuk. Hasil kegiatan juga berupa antusiasme dan semangat siswa-siswi yang mengikuti pelatihan sebanyak 30 orang menunjukkan ketertarikan dalam praktek pembuatan pupuk cair organik dari limbah.

Co-Authors Abdillah Fatkhurrokhman Abdul Hamid Abdul Hamid Abdul Hamid Abdul Hamid Abdul Hamid Abdul Hamid Abdul Hamid Agung Dwi Prasetya Agung Dwi Prasetya Agung Wahyudi Biantoro Ahmad Kharis Surnadi Ahmad Zaki Maulana Alim Murwanto Andi Suryadi Ari Susanto Arvian Iswahyudi Basuki Dwi Efendi Basuki Dwi Efendy Basuki Dwi Efendy Basuki Dwi Effendy Darwin Sebayang Dayu Andryas Saputra Dayu Andryas Saputra Deni Arif Rahman deni Dimas Suharto Dimas Suharto Dimas Suharto Doni Revaldo Eko Saputra Eko Saputra Erlangga Yorda Agustin Erlangga Yorda Agustin Fajar Abdul Aziz Fajar Anggara Farezi Andriansyah Gian Villany Golwa Hadi Pranoto Haris Wahyudi Kurtusi Muhamad Monika Audiya Pratiwi Muhamad Fadhil Faali Muhamad Fadhil Faali Muhammad Ikhsan Muhammad Noor Al-Fauzan Syahputra Muhammad Nurul Hidayat Muhammad Nurul Hidayat Muhammad Nurul Hidayat Naufal Waliy Ishlah Naufal Waliy Ishlah Naufal Waliy Ishlah Nur Indah Nur Indah Nur Indah Nur Indah Nur Indah Panca Purwanto Prasetio Aji Nugroho R. Ariosuko Rio Duzan Octavianto Rita Sundari Salvatore Johanes Rega Salvatore Johanes Rega Salvatore Johanes Rega Setyo Qomarudin Yusuf Suryawan Wicaksono Tri Haryono Triwahyudin Rohman Triwahyudin Rohman Triwahyudin Rohman Tulus Supriyanto Usman Rosid Mashuri Yusuf Nugroho

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