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Effect of Tapper Ratio on a Car Rear Spoiler Performance Harianto, Harianto; Irawan, Yosua Heru; Yawara, Eka; Bakhtiar, Husni
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol 4, No 1 (2019)
Publisher : University of Muhammadiyah Malang

The increasing development of car modification and the lack of understanding on the function of using spoilers or rear wings on vehicles, underlies the research on the aerodynamic forces acting on cars. The influence of this aerodynamic device will produce a compressive force to the bottom of the vehicle or called downforce, where this force is greatly influenced by the CL (lift coefficient) value. The purpose of this study was to determine the effect of variations in the tapper ratio on the value of downforce and drag force on on single-element type spoilers made using a NACA 6412 airfoil. The research was conducted using the Computational Fluid Dynamic method using ANSYS Fluent software with steady state pressure based solver. In this study five variations of the tapper ratio were used, namely: 1:1; 1:0.5; 1:0.7; 0.5:1; and 0.7:1. The fluid properties used are adjusted to the climate and weather in general air conditions and at air flow speeds of 100 km/h. Based on the research conducted, it can be concluded that the highest lift coefficient value was achieved in the 1:1 tapper ratio variation which was equal to CL = -0.2275 and CD = 0.0195. The highest downforce value is achieved in the 1:1 tapper ratio variation that is equal to L = -107,529 N and the largest drag force value is also achieved in the 1: 1 tapper ratio variation that is equal to D = 9.2269 N. The best CL/CD results are obtained at the 1:05 tapper ratio variation with a value of 12.82.

Effect of Tapper Ratio on a Car Rear Spoiler Performance Harianto Harianto; Yosua Heru Irawan; Eka Yawara; Husni Bakhtiar
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 4 No. 1 (2019)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v4i1.7982

The increasing development of car modification and the lack of understanding on the function of using spoilers or rear wings on vehicles, underlies the research on the aerodynamic forces acting on cars. The influence of this aerodynamic device will produce a compressive force to the bottom of the vehicle or called downforce, where this force is greatly influenced by the CL (lift coefficient) value. The purpose of this study was to determine the effect of variations in the tapper ratio on the value of downforce and drag force on on single-element type spoilers made using a NACA 6412 airfoil. The research was conducted using the Computational Fluid Dynamic method using ANSYS Fluent software with steady state pressure based solver. In this study five variations of the tapper ratio were used, namely: 1:1; 1:0.5; 1:0.7; 0.5:1; and 0.7:1. The fluid properties used are adjusted to the climate and weather in general air conditions and at air flow speeds of 100 km/h. Based on the research conducted, it can be concluded that the highest lift coefficient value was achieved in the 1:1 tapper ratio variation which was equal to CL = -0.2275 and CD = 0.0195. The highest downforce value is achieved in the 1:1 tapper ratio variation that is equal to L = -107,529 N and the largest drag force value is also achieved in the 1: 1 tapper ratio variation that is equal to D = 9.2269 N. The best CL/CD results are obtained at the 1:05 tapper ratio variation with a value of 12.82.

EFEKTIVITAS PENGGUNAAN THERMOSTATIC EXPANTION VALVE PADA REFRIGERASI AC SPLIT Harianto -; Eka Yawara
TRAKSI Vol 13, No 2 (2013): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Vapor compression refrigeration is one of refrigeration systems that is mostwidely used for the cooling process in a variety of human needs. In this type of machine there is a component that can be varied kind, namely the expansion valve, such as a capillary tube and thermostatic expansion valve (TXV).Experimental tests have been conducted in a one HP split air conditioningrefrigeration machine capacity to compare the performances between the useof a capillary tube and TXV expansion valve. The experimental results showthat the use of a capillary tube responds to the greater cooling load of thesmaller COP, COP highest achieved in the condition of the refrigerant out ofthe evaporator in the form of vapor saturated with COP = 5.3. While the useof TXV, COP value increases with the addition of the cooling load. Thehighest COP achieved is 5.87.

Pengaruh Profil Sudu Terhadap Koefisien Daya Turbin Gorlov Eka Yawara; Yohannes Agus Jayatun; Daru Sugati
KURVATEK Vol 1 No 2 (2016): November 2016
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v1i2.235

Masalah keterbatasan penyediaan sumber energi dari energi fosil diatasi dengan optimalisasi sumber energi terbarukan, misalnya sumber daya dari air. Salah satu kendala yang dihadapi dari penyediaan pembangkit daya air berskala besar adalah problem lingkungan. Oleh karena itu pembangkit daya air skala kecil atau mikro terus diupayakan pengembangannya, misalnya penggunaan Turbin Gorlov yang memanfaatkan potensi air dengan head rendah atau sangat rendah. Pada penelitian ini dilakukan studi pengaruh profil sudu terhadap koefisien daya pada Turbin Gorlov. Penelitian dilakukan dengan cara simulasi menggunakan perangkat lunak SolidWorks. Profil yang dipilih adalah NACA0012, NACA0017 dan NACA0022, selanjutnya sudu dipuntir dengan sudut puntir 30o, 60o dan 90o. Pada rasio tip-speed yang ditetapkan sebesar 2, hasil terbaik diberikan oleh Turbin Gorlov dengan profil NACA0017 dan sudut puntir 30o, yaitu rata-rata 17,3%.

THE PERFORMANCE OF THE SHELL AND TUBE COUNTER FLOW HEAT EXCHANGER GASES FOR AGRICULTURAL DRYERS Dandung Rudy Hartana; Eka Yawara; Daru Sugati; Amat Agus Salim
KURVATEK Vol 7 No 2 (2022): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v7i2.3761

Abstract—One of the important post-harvest processes of rice is drying. Drying is divided into two, namely natural drying (using sunlight) and artificial drying (using tools). In this study drying utilizes heat from a biomass furnace and a configuration of heat exchanger pipes. Where the utilization of heat and the configuration of heat exchanger pipes in the design can increase thermal efficiency because the exhaust hot air mixed with smoke can still be used for drying. The configuration of the heat exchanger pipe greatly influences the expected moisture content level. The purpose of this study was carried out to determine the performance of the shell and tube counter flow heat exchanger for agricultural dryer gases with a heat source from biomass and to find the effect of the configuration of the heat exchanger pipe arrangement on the working process of the drying machine. This research is an experimental test of the performance of heat exchange pipes with a heat source from a biomass furnace. The exchange pipe performance parameters that must be known are temperature and time. The method used in this study refers to experimental and descriptive methods, namely research conducted in a systematic, factual and accurate manner. The results of this study are that the heated air flow rate affects LMTD, heated air outlet temperature, heat transfer coefficient, and efficiency, with variations in the heated air flow rate of 0.11 kg/s, 0.16 kg/s, 0.20kg/s, 0.24kg/s. Highest efficiency of 94% at a heated air flow rate of 0.24 kg/s. and the smallest efficiency of 74% is found in the value of the heated air flow rate of 0.11 kg/s. Keywords : dewatering, biomass, pipe configuration, heat exchanger pipe

Experimental study of 70 Divergen Angle of Diffuser on Liquid Jet Gas Ejector Daru Sugati; Eka Yawara
Retii Prosiding Seminar Nasional ReTII ke-11 2016
Publisher : Institut Teknologi Nasional Yogyakarta

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Aim of this research is founded the effect of gas-liquid ratio on diffuser performance. Diffuser attached on end of throat of ejectors. Ejector employed water as a motive fluid and air as the entrained fluid. downward flow is direction of flow in the ejector . Ejector generated bubble flow from entrainment and mixing process in the throat section. Performance of diffuser was measured from pressure recovery value. Pressure recovery is differential pressure of upstream and down stream of diffuser divide by kinetic energy on the upstream diffuser. The result of the experimental is increasing of void fraction up to value 0.2, its became pressure recovery increase. Value of void fraction above 0.2, its became pressure recovery decrease.Keywords: ejector, diffuser, pressure recovery, co-current flow, downward flow, two-phase flow

Rancang Bangun Mesin Pencacah Rumput dan Penghancur Kotoran Kambing Dandung Rudy Hartana; Nizam Effendi; Eka Yawara
Retii Prosiding Seminar Nasional ReTII ke-11 2016
Publisher : Institut Teknologi Nasional Yogyakarta

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Usaha pembudidayaan kambing dewasa ini masih dilakukan secara tradisional. Pada saat pakan hijauan banyak, tidak bisa dimanfaaatkan secara maksimal. Salah satu diantaranya yaitu di Kelompok Peternak Kambing Mendo Ngremboko dan Kelompok Peternak Kambing Mendo Raharjo yang berlokasi di Dusun Patihan, Gadingsari, Sanden, Bantul yang hingga kini masih melakukan usaha pembudidayaan secara tradisional. Untuk itu perlu dilakukan langkah-langkah inovatif untuk meningkatkan kesejahteraan peternak. Salah satunya dengan penggunaan teknologi tepat guna berupa Mesin Pencacah Rumput dan Penghancur Kotoran Ternak. Tujuan dengan adanya alat ini akan mempermudah peternak dalam mencacah rumput untuk pakan ternak dengan ukuran hasil cacahan sesuai yang dikehendaki serta untuk menghancurkan kotoran ternak. Dengan demikian, pada saat panen dan hijauan melimpah, pakan ternak bisa diawetkan dengan fermentasi dan tahan beberapa bulan. Selain itu, kotoran yang telah dihancurkan dan terkumpul banyak bisa dimanfaatkan untuk pupuk ataupun dijual. Pada akhirnya, pertumbuhan ternak akan lebih baik disertai produktivitas ternak akan naik serta nilai jual kotoran yang semakin tinggi akan meningkatkan kesejahteraan peternak Kata kunci :pencacahrumput, penghancurkotoran

Edukasi dan Pelatihan tentang Pengelolaan Mesin Pengolah Sampah guna Meningkatkan Pemahaman Bagi Kelompok Bank Sampah di Desa Pandes Angger Bagus Prasetiyo; Kartinasari Ayuhikmatin Sekarjati; Eka Yawara; Wartono; Iman Pradana A. Assagaf; Ikbal Rizki Putra
JNANADHARMA Vol. 1 No. 2 (2023): Juli 2023
Publisher : Fakultas Sains Terapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/jafst.v1i2.4332

Garbage is a problem that is still ongoing today. Based on data from the Ministry of Environment of the Republic of Indonesia, there is the province of Central Java as the highest waste generation in 2022. Therefore, it is necessary to have waste management activities so that they do not have an impact on the environment. One of the community groups that has carried out this activity is the Real Berkah Garbage Bank group located in Pandes Village, Wedi District, Klaten Regency, Central Java Province. The group has been processing organic waste and inorganic waste. However, the management stopped, because one part of the waste processing machine was permanently damaged. So there is a need for a new engine replacement. To prevent this from happening again, community service activities are also needed to increase the level of public understanding in theory and practice. The method used in this community service activity is the lecture method and the practical method. Through this community service activity, there was an increase in the level of understanding of the lecture method by 80% and an increase in the level of understanding of the practical method by 55%.

Simulasi Numerik Rotor Turbin Angin Sumbu Horizontal Dengan Profil Sudu NACA 4412 Irawan, Yosua Heru; Syawal Saing, Muh.; Yawara, Eka; Harianto
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Pembangkit Listrik Tenaga Angin adalah pembangkit listrik yang menggunakan angin sebagai sumber energi untuk menghasilkan energi listrik. Energi angin dapat dimanfaatkan sebagai sumber energi alternatif dan terbarukan menggunakan turbin angin. Kinerja turbin angin tergantung pada bentuk, posisi dan dimensi turbin, dll..Penelitian ini dilakukan dengan metode simulasi numerik. Turbin angin dirancang dengan 3 sudu dengan NACA 4412. Yang dimana target dari hasil penelitian ini dapat memberikan hasil data pengolahan yang diinginkan dengan kriteria yang di harapkan Pengujian dengan kecepatan dan TSR, 5 m/s (6), 6 m/s (5), 7 m/s (4), akan di cari hasil yang menunjukkann bahwa simulasi numerik rotor turbin angin sumbu horizontal dengan profil sudu NACA 4412. Menghasilkan pengujian yang diinginkan dengan standar komputasi yang dijalankan dan ditentukan sebelumnya. Hasil dari penelitian ini mendapatkan nilai Cp mencapai 3% pada TSR 6 dan daya terbaik 126,6 watt pada TSR 5.

Studi Pengaruh Variasi Partikel Shotpeening terhadap Struktur Mikro dan Sifat Mekanis pada Aluminium Paduan Wartono; Rivan Muhfidin; Eka Yawara; Sumpena
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 9 No. 1 (2025)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v9i1.2189

The objective of this research is to find out the effect of shotpeening particle variations on the microstructure, tensile strength, and impact strength of friction stir welding (FSW) joints. In the weld metal area after the material is subjected to friction stir welding (FSW), the material will experience softening and a decrease in mechanical properties compared to the raw material. The shotpeening process on the weld metal surface is expected to improve mechanical properties, because the weld metal surface will experience repeated pressure from the shotpeening particles as a forging effect. Friction welding (FSW) is carried out on materials made of 6061 aluminum alloy and the material has a thickness of 3 mm, with butt joint welding. The friction welding process uses an Aciera brand milling machine, the feeding speed on the machine is set to 18 mm / minute and the spindle rotation is 910 rpm. Shotpeening particles use steel ball and aluminum oxide, namely S 230, Al 24, Al 54. The results of microstructure testing show that the forging effect of shotpeening causes deformation in the surface layer to a depth of 700 µm. The results of tensile testing on FSW joints with variations in shotpeening particles: S 230, Al 24, Al 54 show the optimum tensile strength in shotpeening with Al 54 particles of 208 MPa, and the results of impact testing show the optimum impact price in shot peening with S 230 particles of 0.57 J / mm2.

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