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ANALISIS EFISIENSI PADA GENERATOR 12 SLOT 8 POLE
Full text linkWind energy can be used as an electric energy generator, known as a Bayu Power Plant (PLTB). The PLTB component consists of wind turbines, generators, and batteries. The efficiency of the generator is influenced by the loading system on the power plant, which includes the use of data logger and controller components. The study aimed to find out the efficiency of the 12 Slot 8 Pole generator. The research method uses a MagNet Software simulation, with variables: in the form of R = 15 resistance and rotor rotation n = 1000 - 10,000 rpm. The results of the study show that the efficiency of the generator and the circuit starts to stabilize at rotor rotation n = 3000 rpm; highest efficiency when rotor rotation n = 9000 rpm with efficiency ηmax = 90,04614%; average efficiency ηav = 88.867%.
Keywords: PLTB, 12 Slot 8 Pole Generator, MagNet Software, efficiency
PENGARUH VARIASI FRAKSI VOLUME KOMPOSIT SERAT SABUT KELAPA UNSATURATED-POLYESTER TERHADAP PENGUJIAN TARIK
Full text linkThe development of composite materials in recent years is very rapid. One of them is coco fiber as a material of natural fiber composite amplifier. The benefits of coco fiber coated composites are available, easy raw materials, low density, and easy machining processes. The purpose of this research is to know the mechanical properties of tensile strength with coco fiber reinforcement. In the application of coconut fiber composite engineering products can be used as household, desk panel, ethernet and gypsum. fabrication of coconut fiber-reinforced composites with unsaturated resin-polyester structures as a matrix and coco fiber orientation as reinforced. Variation of volume fraction of composite fiber 0%, 5%, 7,5%, and 10%. The results of this study indicate the fraction of the volume of 7.5% fiber in composites that have tensile test results of 20.2 MPa. While the volume fraction of 10% fiber on composite has the lowest yield of 10.47 Mpa.
Keywords: coco fiber composite, hand lay-up, composite volume fractio
PENGGUNAAN HYDRO-CRACK SYSTEM SEBAGAI UPAYA MENINGKATKAN KINERJA MESIN
Full text linkThe use of hydro-crack systems in combustion motors in addition to functioning to improve exhaust emissions and improve engine performance through the combustion process. Perfect combustion can be adjusted during the combustion process. The purpose of the study was to determine the select magnitude of power increase, decrease fuel consumption and increase the average effective pressure and rotation of the use of 92 octane fuel without HCS. The method of testing engine performance in obtaining data is constant speed (v boarding) based on ISO 1585. Subsequent data signifies presented in a graphical form which is then calculated by statistics. Power increased 2.83hP and bmep 43.19kPa at 4000rpm, sfc dropped 0.0358kg / hP. Hours at 1000rpm and rose by 43.19kPa, when using 92 octane fuel against the standard. When using octane 95 with HCS the power rises 7.95hP at 4000rpm, buys 28.42 kPa when 4500 and sfc drop 0.0537kg / hp. Hours at 1000rpm
Keywords: power, fuel consumption, effective average pressure, octane value, hydro-crack syste
PEMILIHAN KAPASITAS BATERAI PENYIMPAN ENERGI LISTRIK DARI ENERGI SURYA
Full text linkThis paper is concern on the using of some solar batteries for storing the energy from the solar panel. The battery used is a 100 WP solar cell with the appliances. Research was carried out in an open air with real condition without treatment for two months continuously during hot dry season in Malang city, Indonesia. It is concluded that emerged energy from the solar panel was 550 WH or equal to 12 V of 45 AH. During the electric charging from solar panel to the battery, the flowing current vary between 2 A to 6 A. The battery charging only started after 7 am when the voltage was above 12 V. For the solar panel 100 WP to use battery with the storage capacity above 40 AH.
Keywords: battery, solar panel, energ
ANALISIS STRUKTUR STATIS PROVISION CRANE DENGAN SOFTWARE ANSYS 16.2
Full text linkProvision crane is one type of crane used for loading and unloading on ships. Material provision cranes used in this study are structural steel with a cross-section of hollow pipes. This study aims to analyze the strength and equilibrium of the structure of provision cranes. The research methodology used is the analysis of finite element analysis with Ansys 16.2 software. The results of the structural analysis show that the maximum deflection occurs at the end of the boom arm, namely aks max = 0.93843 mm; σymaks maximum yield stress = 36,233 MPa; the maximum yield strain εymaks = 0.027632%.
Key Words: provision crane, finite element method, Ansys 16.2, δmaks, σy mak
PENGARUH VARIASI KONSENTRASI MEDIA PENDINGIN (QUENCHANT) PADA PROSES QUENCH TERHADAP KEKERASAN, STRUKTUR MIKRO DAN RETAK AKIBAT QUENCH (QUENCH CRACK) DARI BAJA AISI 1040
Full text linkCracks during the quench process are a common problem. There are several observational parameters in the heat treatment process to succeed, namely the chemical composition of steel and its hardness, the geometry of the components, mechanical handling, the type of cooling fluid, the temperature of the cooling fluid, the conditions of the coolant, the circulation of the cooling media. In mass production, for example, bolt production in the quench process is more dominant in smaller diameters than As Bar compared to larger diameters. In this study, mechanical properties such as hardness, physical properties such as microstructure and cracking were considered as a function of the quenching conditions of AISI 1040 steel with a diameter of 25mm after hardening process at 850oC with the influence of quenchant concentration variations investigated. The microstructure of as-quench martensite and its development during the Hardening process is observed. The results showed changes in hardness and microstructure as well as cracks that occurred from specimens due to the hardening process on Quenchant Variation
Key Words: Hardness, Heat Treatment, Quench, Quench Crack, Quenchan
PENGARUH TEMPERATUR ANNEALING TERHADAP KEKERASAN DAN STRUKTUR MIKRO KOMPONEN THRUST WASHER DIFFERENTIAL
Full text linkAnnealing is a heat treatment process for the softening metallic materials, especially plain carbon steels. Based on the case study was found that thrust washer differential on the dump truck unit-machine model CWB6BLLDN2 fell up failure. Failure of the component was caused by the impact of gear differential on the differential case. The cracking of thrust washer was affected by the characteristic of materials which low resistance to impact load. Variation temperatures of annealing process are used by 825 °C, 875 °C, 925 °C, and 975 °C. Furthermore, a cooling method that been used is cooling on the furnace. Hardness test is used by Vickers hardness test with an indentation load of 200 kgf, and indentation time of 5 s. Cross section of the microstructure is examined by optical microscope. Based on the hardness test, the hardness is decreased by increasing of annealing temperature. Observation of microstructure shown changes on microstructure that been caused by increasing of annealing temperature.
Keywords: Annealing, Hardness, Microstructure, Thrust washer differentia
PERANCANGAN MULTIPURPOSE WHEELCHAIR
Full text linkThe limitations of the rooms in the hospital may be reasonable, but it will be a problem if this happens at certain times when there is an over the quota of patients such as during an outbreak of Dengue Fever or in the event of a natural disaster. Generally, patients must be willing to sleep on the floor just because of the limitations of the inpatient room and also the bed.
To help overcome this problem, especially to help paramedic needs, a multipurpose wheelchair is designed so that in addition to being able to be used as patient transportation, it can also be used as an examination table. The method used to develop the wheelchair starts from an inventory of wheelchair needs, concept development, and selection. The reference used for concept development is a conventional wheelchair while the criteria set for the variety of concepts are the function, operational ease and convenience (wheelchair wear ergonomics).
As the central part of the wheelchair, the frame is made of stainless steel pipes. To keep the seating position stable, the swing arm is used as a place to hang the seat on the mainframe. The cross position in the middle of the frame functions to keep the wheelchair symmetrical and can be folded when not in use. Semicircular discs with seven keyholes, each of which is spaced 150, are used as a system for backrest mechanisms to allow them to lie down. The rack and pinion system is used as a mechanism for wheelchair lifting when it is functioned as an examination table. Ergonomics analysis with the help of Catia software using the RULA method, the grand score obtained is 3. So that the design of the wheelchair is quite safe
Keywords: Wheelchairs, multipurpose, stable, foldable, rack and pinion and ergonomi
ANALISA PERFORMA TURBIN ANGIN SUMBU HORISONTAL BERSUDU AIRFOIL MELALUI VARIASI JUMLAH SUDU
Full text linkIndonesia is an area that has the potential for sufficient wind resources to be utilized for kinetic energy into other energy such as mechanical energy and electrical energy through its generators (generators). The way to utilize wind kinetic energy into other energy is through a device called a wind turbine. Wind turbines have been around since ancient times, and are called airfoil angled wind turbines. This airfoil wind turbine is designed only for areas with average wind speeds above 6m / s. While in Indonesia not all regions have the same wind speed. In certain seasons, the average wind speed is below 6 m / s. This has become a major problem in regions that have average wind speeds below 6 m / s. Seeing this condition, there is a need for scientific research to obtain wind turbines that can be used in areas with average wind speeds below 5m / s. For this reason, the research I want to do is get a wind turbine that can be used as a power plant in areas that have wind speeds below 6m / s. This research was conducted on the basis of scientific theory in fluid mechanics regarding the sweeping area of wind turbines and the performance of variations in the number of blades in the wind. In addition, the research in several scientific journals was used as the basis of this research
This research method is an experimental method, in the form of testing a wind turbine axis prototype horizontal and airfoil axis. The details of the research activity are the design and manufacture of laboratory scale horizontal airfoil axis turbines. Next, testing with a fan as a source of wind. The fan used has three variations of speed, all of which are used to determine the lowest average wind speed that can be applied. The results of the research are where wind turbines with the greatest torque and power and the Coefficient of Performance (CP) with the highest value will be used as a result to be applied to the community. Based on experimental data, it can be concluded that the greatest torque and power occur in turbines with 4 blades with details at speed 1, the largest torque and power are 0.201 Nm and 4.5 W; at speed 2, the biggest torque and power are 0.25 Nm and 7.21 W; at speed 3, the biggest torque and power are 0.28 Nm and 8.35 W
Keywords: wind turbine, airfoil, nozzle, diffuse
APLIKASI ALAT VACUM PROCESS PADA PENYADAPAN POHON KELAPA TERHADAP VOLUME NIRA YANG DIHASILKAN SEBAGAI UPAYA PENINGKATAN PRODUKTIVITAS PETANI GULA MERAH KABUPATEN BANYUWANGI
Full text linkBanyuwangi has the advantage of being a coastal area including abundant coconut trees. The problem in the tapping process of this sap, especially coconut trees, is the clogging of the tapping area on the flower stem that occurs naturally. So far what has been done is by cleaning the blockage through thin cuts on the tapped part. This is a tiring routine that must be carried out every morning and evening, plus the tapping roomie is brought manually then the shelter is taken up to be reassembled on tapped flower bunches. Therefore it is necessary to have the best solution to the problem. The method of this research is a vacuum system that is applied to the tapping process of the sapper with the aim of finding a comparison of the effect of manual and vacuum methods on the volume of sap produced on coconut trees and the results of fluid obtained compared. The results showed that the tapping process of coconut sap namely the manual method achieved an average yield of 24.12 liters in the morning and 23.15 liters in the afternoon and by using vacuum averaged 24.33 liters in the morning and 23.70 liters in the afternoon.
Keywords: Tapping of coconut trees, vacuum system, the volume of sa