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Introduksi Incubator Buatan Untuk Mempersingkat Waktu Pembuatan Dadih Khairul Amri; Aronald Arif Putra
Jurnal Teknik Mesin Vol 9 No 1 (2012): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Dadih merupakan produk makanan fermentasi khas Sumatera Barat yang diproduksi dengan cara menyimpan susu kerbau di dalam tabung bambu dan membiarkannya selama 2-3 hari sehingga terjadi proses fermentasi yang dilakukan bakteri asam laktat yang berasal dari tabung bambu atau daun pisang atau dari susu itu sendiri, sehingga menghasilkan tekstur yang padat dan mempunyai rasa asam yang spesifik serta memiliki sifat fisikokimia yang sama dengan susu fermentasi seperti yogurt. Tujuan dari penelitian yang dilakukan adalah perancangan dan pembuatan alat incubator untuk mempersingkat waktu pembuatan dadih. Metoda kerja incubator adalah dilengkapi alat control temperature beserta pewaktu dimana suhu ruang incubator akan dijaga konstan pada range suhu optimal yang dibutuhkan oleh bakteri asam laktat untuk berkembang. Disisi lain, pewaktu digunakan sebagai pengingat dan pemberi informasi bagi petani Dadiah bahwa dadiah yang dibuat terlah terbentuk dengan sempurna. Dari hasil pengujian daidapat control temperature dan pewaktu yang dibuat pada alat incubator dadiah dapat bekerja dengan baik dan sesuai dengan alat ukur standar; stopwatch untuk waktu dan thermometer digital untuk temperature. Sesuai dengan teori yang dijelaskan oleh Lee and Lucey, (2010) bahwa bakteri asam laktat berkembang dengan cepat pada suhu 40 0C, ini terlihat dari proses pembuatan dadiah yang hanya butuh waktu 5 jam, dibandingkan dengan proses tradisional yang memerlukan waktu selama 50 jam.
Pengukuran Objek 2 Dimensi Dengan Menggunakan Kamera Berbasis LabVIEW Khairul Amri; Ruzita Sumiati
Jurnal Teknik Mesin Vol 11 No 2 (2018): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Quality Control (QC) is one of the most important components in the manufacturing process. The aim is to determine whether a product is feasible to market. One aspect of QC is the size / dimension of the object to be made. If the size is still within the range of tolerance, then it has passed the QC in terms of size, but if not then it includes a failed product. The problem encountered is that it takes a long time to take measurements, especially objects in the third dimension where each part is different as microdrill, zipper etc. To overcome this weakness, a CCD camera is used as a sensor to record images and then use LabVIEW software to analyze the size of the recorded image. This is a preliminary study so that it is only done for objects with two dimensions with square and circular shapes. From the research that has been done, the measurement with the camera gives results that are almost the same as the use of calipers where the standard deviation fluctuates from 0.3 to 23.8 for circles and 0.54 to 32.05 for squares. Furthermore, the time needed to do one measurement process with the camera ranges from 201 ms to 338 ms whereas using the calipers takes 3 to 5s
Kaji Eksperimental Pengunaan R22 dan R410A Berdasarkan Variasi Laku Aliran Massa Pada Mesin AC Dian Wahyu -; Nasrullah - -; Khairul Amri -
Jurnal Ilmiah Poli Rekayasa Vol 9, No 2 (2014)
Publisher : Pusat Penelitian dan pengabdian kepada Masyarakat (P3M) Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.432 KB) | DOI: 10.30630/jipr.9.2.60

Abstract

The development of the use of air conditioning machines (AC machines) is very high , due to the increased consumption of electricity for household needs are also increasing . Based on field observations of R22 refrigerant is still widely used in commercial air conditioning machines , where the refrigerant has properties that are not friendly to the environment . R410A refrigerant has been recommended to replace worn R22 . It became one of the rationale for conducting the assessment directly to efforts to reduce electricity consumption due to the use of air conditioning machines in the household and the efforts to preserve the environment . The research was conducted on a commercial air conditioning machines by testing the engine for both types of refrigerant ( R22 and R410A ) . Testing the engine characteristics , tested by varying the refrigerant mass flow rate for both refrigerants . The test results showed , electricity consumption ( compressor power ) for the use of both types of refrigerants is similar but uses R410A refrigerant produces a greater cooling effect than by using refrigerant R22 . In Overall effect of the variation of mass flow rate for both refrigerants clearly evident , the increase in mass flow rate causes enhancement of several variables such as the increase in compressor power , cooling effect , the effect of heat release , but for the coeficient of perfomance ( COP ) , the addition of the mass flow rate after COP The optimum value of the COP does not increase anymore . In this study, the highest COP values obtained in the refrigerant mass flow rate 3.4 g / s for R410A and R22 for 1.9 has the highest COP of 1.7 at a flow rate of refrigerant mass 3 g / s . For maximum cooling impact , generated by 0.502 kW to 0.572 kW usage for R22 and R410A.
Pengukuran Aliran Gas menggunakan Ultrasonik Flowmeter 3-Lintasan Akustik Transduser-Ganda dengan Metoda Waktu-Tempuh Simultan K. Amri; L.F. Wiranata; F. Fitria; R. Michael; Suprijanto Suprijanto; D. Kurniadi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 8 No 1 (2016): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2016.8.1.6

Abstract

Ultrasonikflowmeter(USM)denganmetodawaktu tempuhmerupakanflowmeterdenganakurasiterbaik diantarasemuajenisUSMyangadasaatini,tetapisangat senstifterhadapperubahanprofilaliran.Profilaliran adalahdistribusikecepatanaliranfluidapadapenampang melintangpipa.Penggunaanmultilintasanakustikbisa mengatasipermasalahanini,tetapiakanmemunculkan masalahbaruyaitulamanyawaktupencuplikanuntuk satusesipengukuran,karenaselamainiselalu diasumsikanselamasatusesipengukurantidakterjadi perubahankecepatanalirandan/atautidakterjadi perubahanprofilaliran.Bilainiterjadimakahasil pengukurantidaklagimemperlihatkannilaiyang sebenarnya.Untukmengatasipermasalahantersebut, makadiusulkansuatuteknikpengambilan data yang dinamakandenganmetodawaktu-tempuhsimultan denganmenggunakantransduserganda.Penelitianini diawalidenganmelakukanpengujiankinerjabeberapa bentukkonfigurasimultilintasanakustiksecaranumerik. Berdasarkanhasilsimulasidiputuskanuntuk menggunakankonfigurasi3lintasanakustikparalel(LIN) denganpertimbanganfaktorhidrodinamik,faktor sensitivitasorientasi,faktorrentangorientasisertafaktor kemudahanimplementasinya.Selanjutnyadilakukan eksperimendenganmembuatUSMdengankonfigurasi LINdisertaidengansistempengukuranyang menggunakanmetodawaktu-tempuhsimultan.Darihasil pengukurandiperolehnilaikecepatanaliransebesar3,53 m/s dengan  tingkat presisisebesar 3,10%Kata Kunci:USM multi lintasan akustik, metode waktu- tempuh simultan, eksperimen pengukuran, transduser ganda, flowmeter gas
PENGUKURAN DAN REKONSTRUKSI ALIRAN GAS BERPROFIL ASIMETRIS DENGAN HOT-WIRE ANEMOMETER MENGGUNAKAN METODA INTERPOLASI KUBIK Khairul Amri; Andriyanto Andriyanto; Rino Sukma
Rang Teknik Journal Vol 3, No 1 (2020): Vol. 3 No. 1 Januari 2020
Publisher : Fakultas Teknik Universitas Muhammadiyah Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1514.496 KB) | DOI: 10.31869/rtj.v3i1.1703

Abstract

Profil asimetris adalah distribusi kecepatan aliran pada penampang melintang pipa yang acak dan alirannya belum berkembang mantap. Aliran asimetris menyebabkan timbulnya galat hingga 11% pada hampir semua alat ukur flowmeter. Solusi agar pengukuran aliran pada fluida berprofil asimetris tetap akurat adalah dengan mengetahui langsung profil kecepatan aliran karena mampu memberikan informasi distribusi kecepatan aliran dengan tepat. Menggunakan Hot-wire Anemometer, mengoptimalkan penempatan lokasi pencuplikan data pada penampang melintang pipa dan memanfaatkan metoda interpolasi kubik, diperoleh hasil pengukuran yang akurat ketika mengukur aliran asimetris dengan galat rata-rata adalah 1,96 % dan profil rekonstruksi yang diperoleh menyerupai profil yang diukur.
Pembuatan Mesin Pengiris Singkong Pada Usaha Industri Rumah Tangga Dengan Kapasitas 40kg/Jam Sir Anderson; Khairul Amri; Harfardi Harfardi; Rama Pranata
Jurnal Teknik Mesin Vol 15 No 2 (2022): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.15.2.789

Abstract

In this paper, the quality and quantity of sliced cassava chips are improved by design a new slicer machine. The strategy of increasing production capacity is by using an electric motor to drive a chopper blade that makes the faster cutting speed. Meanwhile, the blade is attached to affixed shaft to ensure an even cut. The machine is mainly composed of frame, the feed inlet, chopper blade, motor, v-belt and pulley as transmission part. The slicer machine operates in the following ways: a peeled cassava is pressed into the feed inlet, then the high speed rotating cutter will cut the material into slices, finally the slices drops from the outlet. A fabrication of the machine starts with 1. design technical drawings of the slicer machine using Catia V5R21, 2. manufacturing the frame, shaft, feed inlet and outlet, 3. assembly of all components such as: chopper, bearings, shaft, pulley, feed inlet, cover, motor 1,25 hp 1400 rpm and v-belts. The results of performance test of the slicer machine have actual capacity is 40 Kg/hour with a flatness of 3-4 mm.
Perancangan Mesin Pemutar Gerabah Dengan Kekuatan Tumpuan Maksimal 10 kg Sir Anderson; Yazmendra Rosa; Khairul Amri; Maimuzar Maimuzar; Hendra Hendra; Aqli Ridawansyah
Jurnal Teknik Mesin Vol 16 No 1 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.1.980

Abstract

Pottery is an art craft made from clay which besides having a high use value also has a pretty good aesthetic value. Pottery craft business has existed in Indonesia since ancient times until now. This business has a deficiency in the production machine part, where the production machine still uses human power as the main driving force during the rotation during the pottery making process. Therefore, a modification of a better pottery turning machine is needed to support the pottery craft business. The design of this pottery turning machine uses a working drawing design of a pottery turning machine product with a rotating speed that can be adjusted according to work requirements via a speed control pedal. The pottery turning machine has a strong construction with machine specifications of length 760 x width 400 x height 700 mm, with the addition of 2 pulleys with a first pulley diameter of 2.5 inches, and a second pulley diameter of 12 inches with a connecting belt using type A-57. And by using umbrella gears with a ratio of z1 = 25 and z2 = 50 with a maximum pedestal capacity of 10 kg.
RANCANGAN MESIN SIKAT KARPET DENGAN MODIFIKASI TABUNG CAIRAN DETERJEN Sir Anderson; Khairul Amri; Ferdi Nanda Hafni
Jurnal Ilmiah Poli Rekayasa Vol 19, No 1 (2023): Oktober
Publisher : Pusat Penelitian dan pengabdian kepada Masyarakat (P3M) Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jipr.19.1.335

Abstract

Now, washing carpets no longer requires a lot of human power. Just one person can wash carpets on a large scale at the same time as three human workers. By using this carpet brush machine, the job of cleaning carpets will be easier and faster. The aim of designing this machine is a form of innovation and creativity in a carpet brush machine with an electric motor drive. The machine is made with the addition of a detergent channel tube to make work easier and increase efficiency. The working principle of this carpet brushing machine is that when the motor is turned on, a pulley with a size of Ø 76.2 mm will rotate with a rotation of 1400 rpm, followed by a belt with a size of 24 inches to rotate the pulley on the shaft with a rotation of 703.5 rpm with a pulley size of Ø 152 mm. The rotation will be continued by the shaft, and the brush will rotate to clean up dirt or stains on the carpet. In making this machine, we obtained a motor power of ½ HP and a rotation of 1400 rpm. This machine has dimensions of 580x380x980 mm and uses a belt and pulley transmission with brush components. This carpet washing machine is used for MSME businesses (micro, small and medium businesses)