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All Journal TEKNIK Rekayasa Mesin Semesta Teknika WARTA JMPM (Jurnal Material dan Proses Manufaktur) Wikrama Parahita : Jurnal Pengabdian Masyarakat BERDIKARI : Jurnal Inovasi dan Penerapan Ipteks Journal of Robotics and Control (JRC)
Kamiel, Berli Paripurna
Teknik Mesin Universitas Muhammadiyah Yogyakarta
Aerospace Engineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Pengaruh Fraksi Volume Serat terhadap Sifat-sifat Tarik Komposit Diperkuat Unidirectional Serat Tebu dengan Matrik Poliester Berli P. Kamiel, M. Budi Nur Rahman ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
Publisher : Jurnal Semesta Teknika

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Abstract

Sugar cane fiber has not optimallybeen used as reinforcement of compositematerial. So far, bagasse has been used as  firewood-substitute, raw material for papers, and brake lining. The purpose of this study is to investigate the effect of fiber volume fraction, Vf, on tensile strength of unidirectional sugar cane fiber/polyester composites. The material being used was sugar cane fiber, 268 SHCP BQTN  polyester resin and catalyst . Fibers were soaked in alkali (NaOH) 5% for 2 hours in order to remove their impurities. Composite panels were made with a printing press and the volume fractions of the fiber were 0%, 10%, 20%, 30% and 40%. Prior to being cut into specimens, the panels were subsequenlypost-cured at a temperature of 60 0C for 4 hours. Tensile testing wa carried out according to theASTM D638 standard, and fracture area photo macrographs of selected sampleswere analysed in order to find out the characteristics of fracture. It was found out that increasing the fiber volume fraction resulted in thedecrease of tesilestrength and strain,butincrease of the modulus of elasticity . The highest average tensile strength and strain was obtained at Vf = 0% (31.44 MPa and 9,11%), and a tensile modulus of elasticity was at Vf = 20% of 426.92 MPa. The observations on the photo macrographs showed thatcomposite fracture predominantly occuredspecimens withVf = 30%, and single fracture combined withfiber pull-out was identified for those ofVf = 0%, 10%, 20% and 40%.
Pengaruh Kecepatan Operasi Pompa Sentrifugal Terhadap Sensitifitas Metode Deteksi Fenomena Kavitasi Berbasis Parameter Statistik Domain Waktu Kamiel, Berli P; Ramadhan, Ray S
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
Publisher : Semesta Teknika

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Abstract

Cavitation is one of the main concern on centrifugal pump faults that could cause component damages up to production failure in the industries. It is essential to detect and diagnose the fault as early as possible to prevent a catasthropic failure. Cavitation on sentrifugal pump could be caused by many factor, one of them are caused by the pump operating speed. This paper presents a method that able to detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain. This method is known as vibration monitoring technique that is undoubtedly the most effective technique to detect rotational machinery faults. The cavitation simulated on the test rig by varying the operating speed at 1000 RPM, 1200 RPM, 1400 RPM, …, 2600 RPM and by varying the size of suction valve opening. The cavitation phenomena are measured and indicated by magnitude of vibration level changes in stastical parameter such as Probability Density Function (PDF), Variance, Standard Deviation, Root Mean Square (RMS), Peak Value, Crest Factors and Kurtosis. The results show that PDF, Variance, Standard Deviation and RMS are proved to be able to detect cavitation caused by the pump operating speed variation. However, parameter such as Peak Value, Crest Factor and Kurtosis show low sensitivity and not suitable for the cavitation detection purposes.
Sifat-sifat Tarik dan Flexural Komposit Serat Sabut Kelapa Unidireksional/Poliester Sudarisman, Sudarisman; Kamiel, Berli P; Rahadi, Slamet
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Semesta Teknika

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Abstract

The purpose of this study is to investigate the tensile and flexural properties of unidirectional coconut fiber/polyester composite materials, and to describe their failure modes. Specimens were cut from fiber/polyester composite plates containing various fiber contents. Materials being used in this study are coconut fiber that was previously alkali-treated and polyester resin matrix. Whilst tensile testing was carried out in accordance with the ASTM D3039 standard, flexural testing was based on the ASTM D790 standard. Failure surfaces of the representative specimens were then observed under an optical microscope, and their digital photo macrographs were captured for image analysis in order to describe their respective fiber distribution pattern and to determine their respective actual fiber volume fraction, Vf, by means of an open source software called ImageJ. It was found out that the actual Vf of the four composite plates being produced were 10.7%, 17.6%, 27.4% and 40.5%. It was revealed that while tensile strength increases with the increase of Vf, while failure strain, modulus elasticity and flexural strength decreases. The average highest tensile strength, tensile failure strain, and tensile modulus of elasticity were found being 30.01 MPa at Vf = 40.5%, 0.027 mm/mm at  = 0%, and 1.47 GPa at Vf = 0%, respectively. The average highest flexural strength, failure strain and modulus of elasticity were observed being 153.92 MPa at Vf = 10.7%, 0.0358 mm/mm at Vf = 0%, and 3.242 GPa at Vf =10.7%, respectively. It was observed that specimens were failed by fiber pull out and debonding.
Deteksi Cacat Bantalan Bola Pada Pompa Sentrifugal Menggunakan Spektrum Getaran Kamiel, Berli P; Mulyani, Mulyani; Sunardi, Sunardi
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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Abstract

One of the common fault in the centrifugal pump is faulty bearing. Bearings play a very important role for smooth rotation of a shaft. A bearing condition must be constantly monitored to ensure top performance of a pump. Therefore, a method is needed to detect an early defect in the bearings. One of the most widely used methods for bearing faults detection is based on the vibration analysis. Vibration analysis can detect a defect in a bearing without having to disassemble the machine. Furthermore, and it is fast and easy to be implemented. This study aims to develop a fault detection method on the ball bearing using spectrum analysis by applying envelope analysis. This research uses experimental method with three bearings conditions i.e. normal (no fault), outer race fault, and inner race fault. The type of ball bearings used are self aligning double row bearings. The vibration signal from each of bearing condition is taken from the centrifugal pump vibration test rig and measured using accelerometer sensor which is acquired directly with DAQ and then processed into Matlab. The analysis gives the result of frequency spectrum and envelope spectrum. This study concludes that the high amplitude on the frequency that coincide with the frequency of Ball Pass Frequency Outer Race (BPFO) and Ball Pass Frequency Inner Race (BPFI) make an indication of damage to the bearing on the outer and inner race respectively. The envelope spectrum gives better results as compared to the result of the frequency spectrum. This is because the high amplitude of low frequency generated from other components is blocked and removed using a high-pass filter. Consequently, it becomes easier to detect a low amplitude of high frequency vibration signal from a faulty bearing.
Deteksi Kavitasi Berbasis Getaran Pada Pompa Sentrifugal Menggunakan Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Kausar, Ikhsan Aprima
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212219

Abstract

A centrifugal pump is one type of pumps that widely used in industries. Its mechanism which creates pressure changes may cause cavitation. Cavitation phenomenon that is not properly maintained may results fatal breakdown leading to high economic losses. Therefore, research is needed to find and develop a method that can detect early cavitation phenomena and identify it at several levels as well. This paper presents a method that can detect cavitation by monitoring the vibrations level of the pump based on statistical analysis of time domain and Principal Component Analysis (PCA). Vibration data is collected, trained and tested for each cavitation level. Training data is normalized and trained for each cavitation level using PCA which produces data loading matrix. The loading matrix is then multiplied by the testing data which gives a score matrix used to classify cavitation level of the centrifugal pump. The result shows that the method of domain-based PCA is successful in transforming the original data of 7 statistical parameters to 7 principal components (PC) with maximum variant. Three PCs gives 93.68% variants which can clearly identify and classify the differences between normal, early, intermediate and fully developed cavitation in the centrifugal pumps.
Pengembangan Metode Deteksi Cacat Bantalan Berbasis Analisis Envelope pada Prototipe Fan Industri Kamiel, Berli Paripurna; Nuh, Adib Muhammad; Sudarisman, Sudarisman
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 1 (2018): JUNI 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Abstract

 This paper examines the spectrum and envelope spectrum for detection of ball bearing fault using vibration signals taken from a prototype of industrial fan. It presents a procedure to detect fault on the outer and inner race of roller bearing. Three conditions of ball bearing i.e., normal, outer race fault and inner race fault is tested. The artificial fault on the bearing is 2 mm depth and 0,7 mm width. The vibration signals are taken by using an accelerometer mounted on the vertical-radial direction of bearing pillow block. The waveforms are then transformed into spectrum and envelope spectrum. The differences between spectrum and envelope spectrum for both types of faults are analyzed and discussed. The paper explains the effect of amplitude modulation (AM) on the inner race fault to the spectrum and envelope spectrum. The discussion about the ability of spectrum and envelope spectrum for bearing fault detection is presented and compared in detail. The results show that spectrum has good ability for fault detection since it gives clear and high amplitude of bearing fault frequencies. However the spectrum often fails when the size of fault is relatively small, in this case the envelope spectrum gives better results.
Perancangan dan Analisis Kekuatan Frame Sepeda Lipat Menggunakan Autodesk Inventor Kamiel, Berli Paripurna; Nugraha, Ghozi Adib; Sunardi, Sunardi
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 2 (2018): DESEMBER 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Abstract

AbstrakKemacetan lalulintas adalah masalah yang banyak terjadi di kota-kota besar.  Salah satu cara mengatasinya adalah dengan menggunakan transportasi umum. Meskipun demikian, lokasi halte pemberhentian kadang terlalu jauh dari pusat aktivitas masyarakat jika ditembuh dengan berjalan kaki. Hal ini menyebabkan banyak orang tidak tertarik menggunakan transportasi umum.  Untuk mengatasi masalah ini, dibutuhkan alat transportasi individu yang dapat mempermudah mencapai lokasi halte dengan cepat dan aman sehingga penggunaan transportasi umum menjadi menyenangkan. Tujuan perancangan adalah menghasilkan perancangan sepeda lipat yang lebih efisien dari segi ukuran, bobot, dan harga beli dibandingkan sepeda lipat yang sudah ada di pasar. Perancangan dilakukan dengan menggunakan Autodesk Inventor Professional dan dititikberatkan pada frame sepeda. Untuk menjamin kekuatan dan keamanan ketika digunakan, kekuatan frame dihitung dan dianalisis menggunakan metode elemen hingga. Material frame yang dipilih dari hasil perancangan adalah alumunium 6061-T6. Perancangan menghasilkan sepeda lipat dengan dimensi kondisi terlipat adalah 765 x 742 x 328 mm. Analisis kekuatan frame memberikan tegangan von mises maksimum sebesar 96,32 MPa, displacement maksimum sebesar 6,925 mm, dan faktor keamanan minimum sebesar 2,8. Angka-angka hasil analisis kekuatan tersebut adalah angka tertinggi dari keseluruhan angka hasil perhitungan. Hal ini disebabkan oleh konsentrasi tegangan pada frame yang mengalami diskontinuitas geometri. Meskipun demikian, semua angka tersebut masih berada pada interval yang aman ditinjau dari tegangan ijin rencana. AbstractTraffic congestion is one of many problems that occur in big cities. One of the solution to reduce it is by starting to use the public transport, such as bus and train. But, to reach the public transport, some walk is needed and sometimes the distance is too far to go on foot. Other than that, it’s often that the public tranport doesn’t drop passanger right on the destination, so there will be another walk needed. For that reason, many people don’t like to use the public transport. To solve this problem, there should be an individual transportation device that can make commuting using the public transportation mode become less tiring. This design process aims to result a folding bicycle design which is more efficient in size, weight, and cost compared to the exsisting folding bicycles on the market. The design was made using Autodesk Inventor Professional 2015  software. The design was focused on the bicycle frame. To acknowledge the design safety, strength analysis was conducted on Autodesk Inventor Professional 2015 software using the finite element metode. The choosen material for the design was Aluminium 6061-T6.The design process resulted a folding bicycle design with a folded dimention of 765x742x328 mm. From the strength analysis conducted, the design experienced maximum von mises stress of 96,32 MPa, maximum displacement of 6,925 mm, and had minimum safety factor of 2,8. These values were the worst results from the entire design’s analysis results and only happened in one area. It happened because there was an acumulated stress on some part caused by geometry discontinuity. Even so, the value of the safety factor on this area was still far from the design’s allowed stress. In conclusion, the design was safe to use.
Peningkatan Kemandirian Desa Melalui Pembangunan Instalasi Perpipaan Air Bersih dari Sumber Mata Air ke Rumah Penduduk Sukamta, Sukamta; Sudarja, Sudarja; Nurrahman, Budi; Kamiel, Berli Paripurna; Sudarisman, Sudarisman
Berdikari: Jurnal Inovasi dan Penerapan Ipteks Vol 7, No 1 (2019): February
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/bdr.7152

Abstract

Community empowerment program to make a village independent is very important. Village independence could be seen from various aspects, and one of which is the aspect of independence in the provision of clean water. Clean water supply activities in Balong Hamlet, Donoharjo Village, Ngaglik Sub- District, Sleman Regency are community empowerment activities in order to make Balong Hamlet independent on the aspect of the ability to provide clean water. This activity began with a survey and data collection of local residents’ water needs, followed by calculation of clean water requirements, design of clean water supply and distribution systems, implementation of piping installation, commissioning tests, economic analysis, and its contribution in making the village independent of clean water. This activity produces a piping system for clean water from the spring to the houses of Balong hamlets with a population of approximately 203 households. On average, each household needs 600 liters/day so it requires 121.8 m3 /day or 3654 m3 /month. The price of standard clean water for the Drinking Water Company (PAM) is Rp1,960.00/m3 , so the hamlet has saved Rp7,161,840.00/month or Rp85,942,080.00/year. Thus, this activity has made Balong Hamlet contribute significantly to the independence of Donoharjo Village.
Ekstraksi Parameter Statistik Domain Waktu dan Domain Frekuensi untuk Mendeteksi Kavitasi pada Pompa Sentrifugal Berbasis Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Prastomo, Niko; Riyanta, Bambang
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.8

Abstract

Cavitation phenomenon frequently occurs on the centrifugal pump which may decrease its performance. It may cause a catastrophic failure which leads to a total breakdown of the piping system if the presence of cavitation is not immediately detected and solved. Recently, the popular method used to detect cavitation is based on pattern recognition. The use of pattern recognition technique requires statistical features which are used as input for building the classifier. The extraction of statistical features is usually taken from the vibration signal which consists of time domain and frequency domain. Previous research tends to use the statistical features extracted from the time domain or the frequency domain solely. There is a research gap that can be explored by combining statistical features extracted from both time domain and frequency domain. In this study, Principal Component Analysis (PCA) is used as a feature’s selection and fault classification. PCA linearly transforms statistical features from the original coordinate system into a new coordinate system called principal components (PCs). The first few PCs are a set of selected features which can be used as a classifier. The classifier evaluates and classifies the new set of vibration data then decides whether it falls into normal condition or cavitation category. The vibration signal is taken from the cavitation test-rig under normal condition by opening the valve, level 1 cavitation by opening 75% of valve, level 2 by 50%, and level 3 by 25%. The data is extracted into 7 statistical features from the time domain and 5 from the frequency domain.  Five hundred sets of vibration data are recorded using an accelerometer which was then divided into 400 set for training and 100 set for testing. The study shows that the classifier using statistical features taken from the time domain and frequency domain gives promising results where the clustering effect between normal and cavitation condition is clearly observed.
DETEKSI KAVITASI PADA POMPA SENTRIFUGAL MENGGUNAKAN SPEKTRUM GETARAN DAN SPEKTRUM ENVELOPE Kamiel, Berli P.; Nafsaka, Deby Arikh; Riyanta, Bambang; Asyratul, Azhim
Semesta Teknika Vol 22, No 1 (2019): MEI 2019
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.221231

Abstract

AbstrakKavitasi adalah salah satu indikator penting kondisi operasi sebuah pompa sentrifugal. Fenomena kavitasi ditunjukkan dengan terbentuknya formasi gelembung udara yang kemudian pecah secara tiba-tiba akibat perubahan tekanan pada sisi hisap pompa. Kavitasi dapat menyebabkan kerusakan yang parah komponen pompa terutama bagian sudu atau impeller. Kavitasi biasanya dapat diidentifikasi melalui suara bising dan timbulnya getaran yang berlebihan. Sebuah metode deteksi kavitasi dibutuhkan agar potensi kerusakan lebih lanjut pada pompa sentrifugal dapat diantisipasi secepatnya. Penelitian ini bertujuan menghasilkan sebuah metode deteksi kavitasi menggunakan spektrum getaran dan spektrum envelope pada bentang frekwensi rendah 0-4 kHz dan bentang frekwensi tinggi 4-8,5 kHz. Sinyal getaran pompa direkam menggunakan sebuah akselerometer yang diletakkan pada rumah volute pompa arah aksial. Sinyal getaran kemudian ditransformasikan kedalam spektrum dan spektrum envelope menggunakan  Fast Fourier Transform. Spektrum dan spektrum envelope untuk masing-masing bentang frekwensi dibandingkan antara pompa kondisi normal dan kondisi tiga level kavitasi kavitasi. Hasil penelitian menunjukkan bahwa spektrum frekwensi rendah dapat digunakan untuk mendeteksi kavitasi level 3 yang ditunjukkan dengan peningkatan amplitudo frekwensi poros sebesar 47,6 Hz dan ½ BPF sebesar 149,6 Hz. Sedangkan kavitasi level 1 dapat dideteksi oleh spektrum envelope pada bentang frekwensi tinggi. Dapat disimpulkan pula bahwa penurunan ampitudo teramati secara umum pada domain waktu seiring dengan meningkatnya level kavitasi. AbstractCavitation is an important indication of operation condition for a centrifugal pump. An indication of the appearance of cavitation is the formation of bubbles which collapse suddenly when the pressure changed on the suction side of the pump. The formation of cavitation bubbles can cause fault to the inner pump components. The fault that often results from cavitation phenomenon is affected in the impeller. This fault is usully identified through noise and vibration generated. Therefore, a method is needed to detect early cavitation phenomenon at the centrifugal pump. This study aims to develop cavitation detection methods using the vibration spectrum and envelope spectrum of low frequency band of 0-4 kHz and high frequency band of 4 kHz-8,5 kHz. In this study, cavitation detection in conducted by recording vibration signals that occur at centrifugal pump using an accelerometer. The data obtained is then transformed into the frequency domain and envelope spectrum using Fast Fourier Transform. The results were compared between normal condition and level 1, 2, and 3 cavitation. Comparisons were made on each vibration spectrum and envelope spectrum at the low frequency and high frequency bands. The result of this study showed that the vibration spectrum with low frequency band can detect the formation of level 3 cavitation with an increase in shaft frequency amplitude (47,26 Hz) and ½ BPF (149,6 Hz). Whereas early cavitation or level 1 cavitation was identified through the envelope spectrum at high frequency band. It also showed that a decrease in amplitude occured gradually in the time domain along with increasing level of cavitation.
Co-Authors Anjarico, Fauzan Asyratul, Azhim Bambang Riyanta, Bambang Endah Saptutyningsih Fadilah, Muhammad Rizki Irianta, Henry Ardian Kausar, Ikhsan Aprima Kausar, Ikhsan Aprima krisdiyanto, krisdiyanto Maemunah Malik, Muhammad Malik Nadziful Mulyani, Mulyani Nafsaka, Deby Arikh Nugraha, Ghozi Adib Nugraha, Ghozi Adib Nuh, Adib Muhammad Nurrahman, Budi Prastomo, Niko Rahadi, Slamet Ramadhan, Ray S Riyanta, Bambang Sudarja Sudarja, Sudarja Sukamta Sukamta Sulis Yulianto Sunardi Sunardi Sunardi, Sunardi Wicaksono, Kurniawan Budi Wiranto, Arie Joko