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Jurnal POLIMESIN
ISSN : 16935462     EISSN : 25491199     DOI : -
Jurnal POLIMESIN is an peer-reviewed journal that publishes original and high-quality research papers in all areas of mechanical engineering. The editorial team aims to publish high quality and highly applied research and innovation that has the potential to be widely disseminated, taking into consideration the potential mechanical engineering that it could generate. Jurnal Polimesin is publish twice a year in February and August.
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PENGARUH TIPE BANTALAN BOLA PADA POROS POMPA SENTRIFUGAL TERHADAP SINYAL GETARAN hajar, Ibnu
Jurnal POLIMESIN Vol 16, No 1 (2018): Polimesin
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.552

Abstract

Pompa sentrifugal merupakan salah satu pompa yang sangat banyak digunakan pada industri pengolahan, seperti industri pengolahan air minum, industri pengolahan minyak, dan pabrik kelapa sawit. Bentuknya sederhana dan biaya perawatan lebih murah. Permasalahan yang sering terjadi pada pompa sentrifugal adalah kerusakan pada bantalan poros yang diakibatkan oleh getaran, keausan, dan misalignment. Pada makalah ini membahas pengaruh tipe bantalan bola terhadap sinyal getaran poros pompa sentrifugal satu tingkat. Tujuan penelitian ini adalah mengetahui dan mendapatkan pengaruh tipe bantalan bola pada poros pompa sentrifugal dengan mengukur sinyal getaran. Pompa yang digunakan dalam penelitian ini adalah pompa sentrifugal yang mempunyai head tekanan  9 meter, debit aliran 3 liter/detik dan daya output 746 watt. Metode penelitian dengan mengamati dan analisis perilaku sinyal getaran yang terdiri dari simpangan (displacement), kecepatan( velocity) dan percepatan (acceleration) pada bantalan bola pompa sentrifugal pada titik P-01 dan P-02 dari arah aksial, vertikal dan horizontal. Pengukuran sinyal getaran dilakukan dengan menggunakan alat ukur Vibrometer Analog VM-3314A. Bantalan (bearing) yang gunakan dalam penelitian ini adalah tipe cylindrical roller bearing dan  roller ball bearing yang dipasang pada poros pompa sentrifugal untuk diamati dan ukur sinyal getarannya. Hasil pengujian menunjukkan bahwa harga simpangan tertinggi 37,125 µm terjadi bantalan tipe ball bearing arah horizontal pada titik pengukuran P-02 tinggi tekan 3 meter dengan debit aliran 2,8 liter/detik. Sedangkan harga simpangan terendah  27,1 µm terjadi pada cylindrical roller bearing dengan tinggi tekan 3 meter dan debit aliran 2,8 liter/detik. Dengan naiknya tinggi tekan pada pompa sentrifugal menyebabkan turunnya getaran pompa sesuai penurunan beban pada pompa, sehingga untuk pompa sentrifugal satu tingkat lebih aman menggunakan tipe cylindrical roller bearing.Kata kunci: Tipe bantalan, pompa sentrifugal, sinyal getaranAbstractCentrifugal pumps are one of the most widely used pumps in the processing industry, such as the drinking water treatment industry, the oil processing industry and the palm oil mill, in addition to the simpler and cheaper maintenance costs. The most common problem with centrifugal pumps is damage to the shaft bearings caused by vibration, wear and misalignment. This paper discusses the effect of ball bearing type on the single-stage centrifugal pump vibration signal. The purpose of this research is to know and get the influence of ball bearing type on centrifugal pump shaft by measuring vibration signal. The pumps used in this study are centrifugal pumps that have a 9-meter pressure head, a flow rate of 3 liters / second and a power output of 746 watts. Research method by observing and analyzing vibration signal behavior consist of displacement, velocity and acceleration on centrifugal pump ball bearing at point P-01 and P-02 from axial, vertical and horizontal direction. Measurement of vibration signal is done by using Analog Vibrometer VM-3314A. Bearings used in this study are cylindrical roller bearing and roller ball bearings mounted on the centrifugal pump shaft to be observed and measure the vibration signal. Test results showed that the highest deviation 37,125 μm occurred bearing type ball bearing horizontal direction at the point of measurement P-02 high press 3 meter with flow debit 2,8 liter / second. While the lowest 27.1 μm deviation occurred in cylindrical roller bearing with 3 meter press and 2.8 liter / second flow rate. With the increase in the height of the tap on the centrifugal pump causes the decrease of pump vibration according to the load decrease at the pump, so for the centrifugal pump one level safer using cylindrical roller bearing type.Keywords: Bearing type, centrifugal pump, vibration signalCentrifugal pumps are one of the most widely used pumps in the processing industry, such as the drinking water treatment industry, the oil processing industry and the palm oil mill, in addition to the simpler and cheaper maintenance costs. The most common problem with centrifugal pumps is damage to the shaft bearings caused by vibration, wear and misalignment. This paper discusses the effect of ball bearing type on the single-stage centrifugal pump vibration signal. The purpose of this research is to know and get the influence of ball bearing type on centrifugal pump shaft by measuring vibration signal. The pumps used in this study are centrifugal pumps that have a 9-meter pressure head, a flow rate of 3 liters / second and a power output of 746 watts. Research method by observing and analyzing vibration signal behavior consist of displacement, velocity and acceleration on centrifugal pump ball bearing at point P-01 and P-02 from axial, vertical and horizontal direction. Measurement of vibration signal is done by using Analog Vibrometer VM-3314A. Bearings used in this study are cylindrical roller bearing and roller ball bearings mounted on the centrifugal pump shaft to be observed and measure the vibration signal. Test results showed that the highest deviation 37,125 μm occurred bearing type ball bearing horizontal direction at the point of measurement P-02 high press 3 meter with flow debit 2,8 liter / second. While the lowest 27.1 μm deviation occurred in cylindrical roller bearing with 3 meter press and 2.8 liter / second flow rate. With the increase in the height of the tap on the centrifugal pump causes the decrease of pump vibration according to the load decrease at the pump, so for the centrifugal pump one level safer using cylindrical roller bearing type. Keywords: Bearing type, centrifugal pump, vibration signal
RANCANG ULANG MESIN PENYAYAT DAGING SAPI UNTUK BAHAN BAKU MEMBUAT ABON MENGGUNAKAN MOTOR LISTRIK 1 HP Hasrin, Hasrin; Zuhaimi, Zuhaimi; Sumardi, Sumardi
Jurnal POLIMESIN Vol 16, No 1 (2018): Polimesin
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.548

Abstract

The high consumption of processed beef products is a separate business opportunity to be developed. The shifting consumption pattern of the people in consuming processed beef products from fresh meat to processed products ready to encourage some parties to develop technology in terms of processing beef. In making abon now it is still traditional by using hands, knives or forks to cut the meat after the boiling process until cooked to be made abon. By using such manual equipment of course the process of making abon will take a long time, greater energy, and besides also slicing meat by pounding using a fork is considered less safe for workers. The purpose of this research is to get a tool / machine penyya beef is simpler for raw materials to make abon using electric motor 1 hp. Changes in the redesigned construction consist of: cylinder casing design, inlet and outlet ducts, container tubs and placemats. The result of the test has been tested by 1 kg of beef, thus showing the measured fiber texture measurement results consist of: 0.5 mm thickness, 30 mm length; 1 mm thick, 35 mm long and 1.5 mm thick, 35 mm long. Capacity of beef cultivation yields are: 3.3 ounces / minute or 1 kg / 3 minutes. So it can be concluded the closer the gaps in the cassing, then the result of the incision the better (smoother). Keywords: Meat meat machine, inlet hopper, cylinder case
OPTIMALISASI SISTEM TATA UDARA GEDUNG PERKANTORAN BERTINGKAT DENGAN METODE SIX SIGMA (Studi Kasus Gedung PT.Bank Aceh Cabang Lhokseumawe) Syamsuar, Syamsuar
Jurnal POLIMESIN Vol 16, No 1 (2018): Polimesin
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.549

Abstract

The use of energy in the air system of PT. Bank Aceh Lhokseumawe branch annually averages 60 - 75% of total energy consumption in buildings. The purpose of this research is to optimize energy use in air system continuously using Six Sigma approach. The six sigma approach is expected to reduce the cost of using the air system system without neglecting the comfort level according to the national comfort standard (SNI). The problem faced by the air system is the existence of over cooling load (over cooling load), the value reaches the figure beyond the initial 60,000 watts planning capacity. The calculation results obtained actual average cooling load reached 75,580.3 watts. It is known that the cooling overload is caused by several factors, namely: the quantity of occupant / human, the air ventilation factor, the management factor of electric appliances usage, the lighting factor, and the solar radiation / transmission factor. Solutions to improve the air conditioning system by minimizing the factors that cause over cooling load. The results of the improvement get a cooling load of 57,340.9 watts which means savings of 24.2%, or monthly electrical energy savings of 4,428.324 kwh / month or equivalent to 50,739.888 kwh / year. Keywords: cooling load, six sigma, optimization, critical to quality
DESAIN DAN FABRIKASI PATOK RINTANGAN LAPANGAN GOLF BAHAN POLYMERIC FOAM YANG DIPERKUAT SERAT TANDAN KOSONG KELAPA SAWIT Zulfahmi, Zulfahmi
Jurnal POLIMESIN Vol 16, No 1 (2018): Polimesin
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.550

Abstract

A golf course with obstacles in the forms of water obstacle and lateral water obstacle marked with the stakes which are called golf course obstacle stake in this study. This study focused on the design and fabrication of the golf course obstacle stake with a solid cylindrical geometry using EFB fiber-reinforced polymeric foam composite materials. To obtain the EFB fiber which is free from fat content and other elements, EFB  is soaked in the water with 1% (of the watre total volume) NaOH. The model of the mould designed is permanent mould that can be used for the further refabrication process. The mould was designed based on resin-compound paste materials with talc powder plus E-glass fiber to make the mould strong. The composition of polimeric foam materials comprised unsaturated resin Bqtn-Ex 157 (70%), blowing agent (10%), fiber (10%), and catalyst (10%).  The process of casting the polimeric foam composit materials into the mould cavity should be at vertical casting position, accurate interval time of material stirring, and periodical casting. To find out the strength value of the golf course obstacle stake product, a model was made and simulated by using the software of Ansys workbench 14.0, an impact loading was given at the height of 400 mm and 460 mm with the variation of golf ball speed (USGA standard) v = 18 m/s, v =35 m/s, v = 66.2 m/s, v = 70 m/s, and v = 78.2 m/s. The clarification showed that the biggest dynamic explicit loading impact of Fmax = 142.5 N at the height of 460 mm with the maximum golf ball speed of 78.2 m/s did not experience the hysteresis effect and inertia effect. The   largest deformation area occured at the golf ball speed v = 66.2 mm/s, that is 18.029 mm (time: 2.5514e-004) was only concentrated around the sectional area of contact point of impact, meaning that the golf course obstacle stakes made of EFB fiber-reinforced polymeric foam materials have the geometric functional strength that are able to absorb the energy of golf ball impact. Keywords: Composite, Polymeric Foam, EFB Fiber, Tension Distribution, Ansys Workbench 14.0
APLIKASI TEKNIK MANUFAKTUR VACUUM ASSESTED RESIN INFUSION (VARI) UNTUK PENINGKATAN SIFAT MEKANIK KOMPOSIT PLASTIK BERPENGUAT SERAT ABACA (AFRP) Dabet, Abubakar; Indra, Indra; Hafli, Teuku
Jurnal POLIMESIN Vol 16, No 1 (2018): Polimesin
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.551

Abstract

AbstrakInovasi dalam bidang material komposit menuntut terciptanya material yang lebih ramah lingkungan.  Saat ini komposit serat alam (green material) patut dipertimbangkan menjadi material yang sangat berpotensi untuk mensubstitusi komposit serat sintetis sebagai material teknik. Serat alam mempunyai kekurangan karena mempunyai scatter sifat mekanik yang sangat besar. Salah satu cara untuk mengatasi kekurangan tersebut adalah melalui pemilihan proses manufaktur (fabrikasi) komposit. Tujuan penelitian ini adalah membuat prototype komposit plastik berpenguat serat abaca (AFRP)  menggunakan metode Vakum (Vacum Assested Resin Infusion (VARI)). Semua spesimen dilakukan postcure pada suhu 800 C selama 2 jam. Sifat mekanik dari komposit dievaluasi uji tariknya. Komposit AFRP difabrikasi dengan fraksi volume (Vf) : 20%, 30% , 40%, serta ukuran spesimen uji (140x5x1) mm. Dengan proses fabrikasi sebagai berikut: 1) Serat abaca disusun dalam cetakan kaca yang memanjang sejajar (00) kemudian dimasukkan ke dalam kantong plastik vakum. 2) Resin dicampur hardener dialirkan kedalam cetakan yang sudah kondisi vakum. Metode cetakan ini dapat menghilangkan gelembung udara di dalam komposit sehingga diharapkan kekuatan tarik komposit menjadi lebih tinggi.  Bahan-bahan yang diperlukan dalam penelitian ini adalah: Serat abaca, Resin BTQN 157-EX, Hardener MEKPO dan Wax. Peralatan yang diperlukan adalah: Instalasi cetak vakum, Alat uji tarik, Kamera digital, dan Scanning Electron Microscope (SEM). Penampang patahan diselidiki untuk mengidentifikasi mekanisme perpatahannya.  Hasil penelitian menunjukkan bahwa kekuatan dan regangan tarik komposit memiliki harga optimum untuk (Vf) 40%, yaitu 257 Mpa dan 0.44%.  Penampang patahan komposit diklasifikasikan sebagai jenis patah slitting in multiple area sehingga dapat disimpulkan bahwa komposit plastik berpenguat serat abaca memiliki potensi yang cukup besar untuk diaplikasikan sebagai material struktural. Kata kunci: Serat Abaca, AFRP, Kekuatan tarik, VARI, Scanning Electron Microscope AbstractInnovation in composite materials demands the creation of more environmentally friendly materials. Currently the composite of natural fibers (green material) should be considered to be a material that has the potential to substitute synthetic fiber composites as engineering materials. Natural fibers have disadvantages because they have a very large mechanical properties scatter. One way to overcome these shortcomings is through the selection of a composite manufacturing (fabrication) process. The purpose of this research is to make prototype of plastic composite with abaca fiber (AFRP) using Vacuum Assured Resin Infusion (VARI)). All specimens were performed postcure at 800 C for 2 hours. The mechanical properties of the composites are evaluated by the tensile test. The AFRP composite is fabricated by volume fraction (Vf): 20%, 30%, 40%, as well as test specimen size (140x5x1) mm. With the fabrication process as follows: 1) Abaca fiber is arranged in a parallel laminated glass mold (00) then put in a vacuum plastic bag. 2) The resin in the mixed hardener flowed into a mold that has a vacuum condition. This mold method can remove air bubbles inside the composite so that the expected composite tensile strength becomes higher. The materials needed in this research are: Abaca fiber, BTQN 157-EX Resin, MEKPO and Wax Hardener. The necessary equipment are: Vacuum printing installation, Tensile test equipment, Digital camera, and Scanning Electron Microscope (SEM). Fault cross sections were investigated to identify the fracture mechanism. The results showed that the strength and composite tensile strain had the optimum price for (Vf) 40%, ie 257 Mpa and 0.44%. The composite fault cross section is classified as a type of broken slitting in multiple areas so it can be concluded that the plastic composite of abaca fibers has considerable potential to be applied as a structural material. Keywords: Abaca Fiber, AFRP, Tensile Strength, VARI, Scanning Electron Microscope

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