Jurnal Ilmiah Poli Rekayasa
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Analisis Kegagalan Boom Crane dan Pencegahannya
Get PDFSleeve (Boom) on Crawler Crane is the main equipment that serves the weight at the time of appointment (Hoisting).The problem which is founded is a fracture at the boom while lift 6 Tons of weight while the optimum design of equipment is 50 tons. The aim of this research is to found the root cause of the fracture by using photo documentation fractografi (microfractografi and macrofractografi), and hardness tests, and test the chemical composition at the surface faults boom crane. We used Finite element method (FEM) to form simulated load. The results is that the porblem accured because of error while read the load chart and error in SO
Perancangan dan Implementasi Network Monitoring Sistem Menggunakan Nagios dengan Email dan SMS Alert
Get PDFNetwork Monitoring System is a system which has a function to observe or monitor the computer network system is running. Network monitoring system can be implemented in real time in a computer network.Development of network monitoring system using the local ip and web-based applications, where the construction of this network monitoring system using CentOS 6.4 operating system as the server.Nagios is a network monitoring application based on open source that can be used according to user needs. To maximize the use of Nagios can use email and SMS as alerts
Pembuatan Alat Pemotong, Pencampur dan Pengaduk Pakan Ternak Sapi dengan Metode Logika Fuzzy untuk Meningkatkan Efisiensi Pakan Ternak
Get PDFThe growth of cattle majorly affected by the type of fodder and its digestion system. To gain the healthy growth, cattle fed green grass and additional concentrate in form of mixed agricultural wastes such as rice straw, corn straw, etc and tofu residues in cattle fodder. Since cattle have no upper incisor, (insisivus), it use combination of its molar and its tongue to cut the grass or rice straw or corn straw, as the result more fodder like fresh grass, rice straws or corn scraws are wasted. If the wasted re-use by giving it back to cattle, it will not eat it, so it will cause inefficiency in feeding livestock. In order to solve that problem a chopping and mixing tool is needed, by using fuzzy method to control a dc motor constant speed to chopping grass, rice straws and corn straws, and then mixing with additional concentrate such as tofu wasted. Rice straws, corn straws and fresh grass are chopped in chopping section and mixed with tofu residues in the mixing section. When all the food material mixed and stired, the weight will be measures using a current sensor ACS712-20A. This sensor is used to measure the motor load. Furtheremore, if the more food materials place into this device, so, the faster the dc motor will rotate. When this device loaded 3000gr, the current measure is 4.53 ampere. The load position is not smooth will result the reading of the sensor always fluctuated. As the result, the fuzzy method applied will be optimal when the current is 4.22 ampere and the PWM fuzzy is higher than 252-mark is legibl
Gerusan Lokal yang Terjadi di Hilir Bendung dan Upaya Pengendaliannya
Get PDFMajarity of damages on the dam construction in Indonesia is caused by continuous local scouring at the end side of the dam construction. It grows and reach its lower/bottorm part. It could results in degradation in the dam operation safety. This local scouring was caused by major water flowing passing the dam where there is a high difference level between the top and the end of the dam. Furthermore, it generates inbalancing water flow speed and additional water turbulence. There are different approachs to prevent such damage, and for example by providing one or more additional construction at the end part of the dam. This structure is designed and installed at the bottom part of the dam. Various empirical functions have been developed to design this structure, and one of them is developed by Lacey. The function is reprsented by D = 0.47 * (Q/F)1/2 (D= scouring depth, Q= Discharge, F= the size of the sand particle). However, that function has some limitation. For examples are the local river and dam construction characteristics. Therefore, it is required to be validated by developing a model of dam contructed in a laboratory. Experiments was undertaken by using the model with different characteristics of water flow in order to investigate the scouring pattern, and than method prefentif wor
Kestabilan Global Endemik Model Epidemi SEIR
Get PDFIn this paper, it will be studied global stability endemic of equilibrium points of a SEIR model with infectious force in latent, infected and immune period. From the model it will be found investigated the existence and its stability of points its equilibrium. The global stability of equilibrium points is depending on the value of the basic reproduction number If there is a unique endemic equilibrium which is globally asymptotically stable
Model Numerik 1D Penggerusan Endapan di Mulut Muara dengan Metode Beda Hingga
Get PDFSedimentation at estuary river have potency to cause floods because the narrowing of estuary as outlet. Sedimentation process can be caused by the so small river discharge at dry season so that cannot to flushing the sediment that happened at estuary mouth. When the rains arrive, river discharge which starting to big shall no long castaway to sea freely, so that causes floods in headwaters. Numerical simulation by using finite different method with Preissmann implicit scheme conducted to see ability of river discharge in early the rains to flushing the sediment in estuary mouth. Simulation was done at river with sediment elevation at + 4.00 m in estuary mouth. Boundary condition in the form of discharge hydrograph in early the rains at upstream boundary and also critical water surface elevation in sediment top and sea level at downstream boundary applied at model to see behavior of sediment transport and change of profile at bottom channel that happened. Simulation result show with 24 hours floods charge in early the rains, sediment volume of flushed equal to 20,52 %, with elevation reside at + 3,179 m. Sediment will fully under sea-water face after 9 days simulation. Change of upriver discharge and tidal elevation at downstream will influence to speed of stream that happened. By the end of simulation, the bottom profile of channel influenced of tide
Menentukan Kematangan Buah Manggis Menggunakan Metode Summary Squared Error (SSE) yang Diaplikasikan pada Belt Conveyor Pemisah Buah
No full textAll parts of mangosteen are useable. In order to obtain some qulified mangosteen, it is need to make a belt conveyor sorting system which is able to sort based on it’s diameter and maturity. To obtain the maturity decision it is used Sum Squared Error (SSE) methode which find the minimum error of image RGB value between mangoosten rind color and the color templates. When need to derive the diameter, it is utilize the hough circle transform method.The results give 86% accuracy of maturity detection, 10.9% error accuracy of diameter measurements when mangosteen stalks are up and 3.4% error in diameter value when mangoosteen stalks are down
Kaji Eksperimental Pengunaan R22 dan R410A Berdasarkan Variasi Laku Aliran Massa Pada Mesin AC
Get PDFThe 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
Studi Pemanfaatan Abu Tanah Liat Bakar Asal Gunung Sarik Padang Sebagai Filler Pada Campuran Hot Rolled Sheet (HRS) – WC
Get PDFTogether with advancement in transportation technology, there is a need to study current technology on transportation. Various research have been conducted on pavement to achieve a strong, durable, and economic construction. One of the constructions is Hot Rolled Sheet – Wearing Course (HRS-WC) or widely known as thin concrete asphaltic layer. Concrete asphalt is a flexible pavement with high structural strength and widely used in Indonesia as road pavement. Therefore the characteristic of the mixture is highly affected by type and percentage of filler in the mixture. In the last two decades, design methods are developed based on analytical method which require stiffness modulus and structural values of the material. During this period many research have been conducted on the methods to improve performance of asphaltic concrete by modification of materials as well as material substitution.The main objective of this study is to evaluate the impact of substitution of standard filler of HRS-WC with clay mineral from Gunung Sarik, Padang, on Marshall properties parameters such as stability, density, VIM, VMA, VFB, flow, and MQ. This aim is achieved by analyzing Marshall properties of the mixtures.Our study shows that the substitution of standard filler with clay mineral from Gunung Sarik with variations from 25%, 50%, 75%, and 100% has no significant impact on optimum asphalt content and other Marshall properties such as Density, VIM, VMA, and Flow. These values do not vary from mixtures using standard filler
Pengembangan Mesin Pencacah Tandan Kosong Sawit (TKS) dengan Metode Pemotongan Crusher
Get PDFPalm empty fruit bunches (EFB) fiber content ± 70 % and can be used for elastic fiber, matrix, mattresses, rugs and raw material fiber -based composite board products, but until now has not been utilized to the fullest . The problem is not the availability of processing unit generates EFB fiber in small scale . One of them is the processing unit thrasher EFB. EFB counter technology that exists today is a large scale that can only be owned by the oil palm industry with a capacity of ± 4,124 kg/hour. For small-scale fiber industry needs a minimum engine capacity of census enumerators ± 300 kg/hour, but this machine is not yet commercially available.In general, the purpose of this research is small scale EFB cutting machines with a capacity of 200-300 kg/hour, the design parameters and identify optimum operating conditions for each component with the technical test of the prototype. From the results obtained machine design an engine capacity of 300 kg/hour, with a few major components, namely counter unit, unit funnel in and out, frame and drive unit . From the results of design calculations obtained engine power 15 hp motor drive with 1450 RPM rotation with 3 phase. From the results of the testing machine in the first enumeration results obtained by the size of the pieces of shredded EFB ± 7 x 7 ( cm ), while the second enumeration stage shredded EFB size becoming smaller ± 3 x 3 ( cm )