Jurnal Keteknikan Pertanian
Not a member yet
627 research outputs found
Sort by
The equipment that were bought from the manufacturer would have the data of reliability for example, MTTF (Mean Time To Failure), MTBF (Mean Time Between Failure) or MTTR (Mean Time To Repair), however these data only valid if the operation and maintenance condition are same with the operation and maintenance condition that were given by the manufacturer. If these condition could not be satisfied by the user then the data of MTTF, MTBF and MTTR that given by manufacturer could not be able as a refwence data of reliability. This research aimed to devt?loped the statistical method of probability density fimtion which can be used on the data processing which are collected during operation and maintenance of the paper machine P. T Kertas Padalarang from 1980 to 1995. By processing these data, MTTF, MTBF or MTTR of the components can be determined. To calculate the tofal failure probability of paper machine, the author used the sofrware of DFT (Diagram Fault Tree Analysis) that developed by Suryadh.na.N.N.\u2771 The result of this research is the total failure probability of paper machine is 0.999 at the operation time of 2000 hr. It is mean that at that operation time the machine has reached failure condition, may be it will stop suddenly. At that operation time, the reliability of machine is 0.001. The Operation time of 2000 hr could be able as a reference value for doing maintenance and repair.
No full textThe equipment that were bought from the manufacturer would have the data of reliability for example, MTTF (Mean Time To Failure), MTBF (Mean Time Between Failure) or MTTR (Mean Time To Repair), however these data only valid if the operation and maintenance condition are same with the operation and maintenance condition that were given by the manufacturer. If these condition could not be satisfied by the user then the data of MTTF, MTBF and MTTR that given by manufacturer could not be able as a refwence data of reliability. This research aimed to devt?loped the statistical method of probability density fimtion which can be used on the data processing which are collected during operation and maintenance of the paper machine P. T Kertas Padalarang from 1980 to 1995. By processing these data, MTTF, MTBF or MTTR of the components can be determined. To calculate the tofal failure probability of paper machine, the author used the sofrware of DFT (Diagram Fault Tree Analysis) that developed by Suryadh.na.N.N.\u2771 The result of this research is the total failure probability of paper machine is 0.999 at the operation time of 2000 hr. It is mean that at that operation time the machine has reached failure condition, may be it will stop suddenly. At that operation time, the reliability of machine is 0.001. The Operation time of 2000 hr could be able as a reference value for doing maintenance and repair
Rheological Properties of ABS Lustran QE1455 in Different Temperatures
Full text linkPaper ini menyajikan sifat-sifat rheology ABS Lustran QE1455. Sifat-sifat yang diteliti meliputi shear rate on viscosity, effect of shear stress on viscosity, and effect of temperature on viscosity. Pengukuran in-line atau in-process dirancang untuk mengukur dan mengontrol proses fluida. Data diambil dad penelitian yang dilakukan di Laboratoritum Polymer, the University of Bradford, England. Percobaan menggunakan Cincinnati ACT30 untuk mengukur in-line rheometry. Data yang diperoleh akan disajikan dalam paper ini. Shear stress sebagai fungsi dad shear rate disajikan dalam grafik dan terlihat bahwa grafik membentuk kurva yang berbentuk cekung ke bawah. Perilaku shear stress meningkat apabila shear rate meningkat. ditunjukkan dalam grafik itu. Viscosity sebagai fungsi dari shear rate diplotkan dalam beberapa temperatur yang berbeda. Penurunan viskosity terjadi saat peningkatan shear rate seperti ditunjukkan dalam grafik lain. Perilaku ini disebut aliran pseudoplastic. Pada shear rate sama, grafik menunjukkan implikasi semakin tinggi temperatur semakin rendah shear viscosity
Pendugaan Sebaran Suhu pada Penukar Panas Pipa Vertikal
Full text linkPenelitian ini bertujuan untuk mengembangkan model matematik dalam menduga sebaran suhu pad a penukar panas jenis pipa vertikal, serta menduga suhu udara pengering yang dihasilkan oleh penukar panas. Hasil penelitian ini diharapkan dapat memberi manfaat pad a perancangan alat penukar panas serta meningkatkan efisiensi dalam penggunaan bahan bakar pada penukar panas. Hasil simulasi menunjukkan bahwa laju pembakaran bahan bakar merupakanparameter penting dalam sistem penukar panas. Pada laju pembakaran bahan bakar 0.77 kg/jam, suhu udara pengering yang dihasilkan adalah 56.2 °e. Sedangkan pada laju pembakaran bahan bakar 2.32 kg/jam, suhu udara pengeringadalah sebesar 90.9 °e. Laju aliran udara pengering dan luas permukaan penukar panas berpengaruh terhadap peningkatan efektifitas penukar panas. Setiap peningkatan laju aliran udara sebesar 0.2 m 3/detik, maka efektifitas penukar panas naik sebesar 0.02 hingga 0.03. Namun, penambahan laju ini akan menurunkan suhu udara pengering yang dihasilkan
Study on the Storage Characteristics of Minimally Processed of Oranges (Citrus grandis L.) Under Modified Packaging
No full textOrange (Citrus grandis L.) is one of horticulture commodity which is consummed because of its delicious taste and plenty vitamins and minerals that is required by the humm body. The respiration rate of the minimally processed of orange at 10, 15 and 27.5 OC were 8.10, 13.24 and 28.212 ml/kg. h, re.jp,pectivily. The respiration rate of whole (unpeeled) orange at the same storage temperature were 10.15, 19.13 and 42.28 ml/kg. h, respectivily
Effect of Impact and Fruit Harvesting Indexes on the Quality of Mangosteen Fruit
No full textMangosteen fruit is one of tropical exotic fruits that has potency as exported commodity but its potency is limited by its poor quality. Both the fruit shell and its aril are very susceptible to any improver handling during and after harvesting andsince then its quality decreases rapidly. Experiments were set up to study the effect of impact, by dropping the fruit from certain heights, and fruit harvesting indexes on its quality. Visual observations showed that dropping the fruit from 0.5 m above the floor was sufficient to damage fruit shell and aril. The inner surface of fruit shell that subjected to the impact became brown and the aril became translucent and tasteless. Quantitatively, fruit shell became hard after two-day- storage and the dropping of the fruit and fruit harvesting indexes significantly affected total soluble solid of the aril. The fruit with harvesting index 5 significantly contained the less total soluble solid when it was dropped from the height of 1 m and stored for 6 days
Design of the Prototype Instrument for Measuring Freshness of Fish Based on Resistance
Full text linkThe freshness of the dead fish is very difficult to be known visually whereas the use of chemical analyses is not only time consuming but also is not readily available at for market. Therefore, it is considered necessary to find out a newmethod for that purpose. In this. research, a prototype instrument for measuring freshness of the dead fish was designed based on the fish electrical resistance. The sensor was made of a couple of steel wires with diameter of 0.5 mm. During measurement, the wires sensor was inserted into the fish body with the distance of 2 cm to each other. Result of the research showed linear relationship between dead fish freshness and its resistance. The linear relationship was also found between water content of the fish body and its resistance
Informatika Pertanian : Status Saat ini dan Prospek di Masa Depan
Full text linkPertanian berbudaya industri merupakan orientasi pembangunan pertanian masa depan di INdonesia. Pertanian berbudaya industri diartikan sebagai pengelolaan kegiatan pertanian secara industri.Beberapa ciri pertanian bebudaya industri adalah adanya pemanfaatan ilmu pengetahuan untuk pengambilan keputusan. pemakaian kemajuan teknologi sebagai instrumen utama pada pemanfaatan sumberdaya dan perekayasaan untuk meminimalkan ketergantungan terhadap lingkungan, efisiensi dan produktivitas sebagai dasar uatama dalm alokasi sumberdaya, mutu dan keunggulan merupakan orientasi, wacana sekaligus tujuan, dan mekanisme pasar instrumen utama dalam transaksi barang dan jasa (Kartasasmita, 1996)