Wahyu Sugandi et al., International Journal of Emerging Trends in Engineering Research, 9(8), August 2021, 1086 – 1090 1086 Modification and Performance Test of Prototype I Washer Machine Wahyu Sugandi 1 , Asep Yusuf 2 , Asri Widyasanti 3 1 Department of Agriculture and Biosystem Engineering, Universitas Padjadjaran, Indonesia, sugandiwahyu@gmail.com 2 Department of Agriculture and Biosystem Engineering, Universitas Padjadjaran, Indonesia, asep.yusuf@unpad.ac.id 3 Department of Agriculture and Biosystem Engineering, Universitas Padjadjaran, Indonesia, asriwidyasanti@gmail.com ABSTRACT The sweet potato (Ipomoea batatara L.) is one of the world’s important tubers with a production of more than 133 million ton. In 2019, the Laboratory of Agricultural Equipment and Machinery designed a Prototype I Washer The machine is not optimal, reaching 67.13%, and it needs to be modified because the skin of the sweet potato is cleaned and exfoliated so that it can reduce the quality of the sweet potato. The method used in this research is engineering, which is a non-routine design activity with new construction of process and product. Base on Matlab program, the result of the modification research and performance tests, is by using the prototipe I washer, the percentage of the level of cleanliness was 80.02%. Where with an increase 67.13% using the performance machine. Based on the evaluation of technical feasibility and engine performance tests, it is found that the propulsion power needs 1 HP and the deflection of the frame is only 13.06 mm. The theoretical capacity of the engine is 231.68 kg.hour -1 , the actual capacity is 100 kg.hour -1 with an efficiency of 44.39%, the noise level of 77 dB and the engine vibration of 13.43 m.s -1 . Key words: modification, sweet potato, washing machines 1. INTRODUCTION Sweet potato (Ipomoea batatara L.) is one of the world’s important tubers with a production of more than 133 million tons, included in the seven important plant sources of carbohydrates after wheat, rice, corn, potatoes, barley and cassava [1].The sweet potato production center is the village of Cilembu District. Pamulihan District. Sumedang, West Java Province. Sweet potato is one of the potential agricultural products in Indonesia with a land area of about 178,121 ha. The average productivity of Indonesian sweet potato is 12,329 tons/ha, with a total production of 2,196,033 tons. The average productivity of sweet potatoes in West Java is 15,373 tons/ha, with a total production of 429,378 tons.Sweet potato plants can be harvested when the tubers are old (physiologically ripe). Short-lived sweet potatoes can be harvested at the age of 3-3.5 months, while long-lived varieties can be harvested at the age of 4.5-5 months. After the sweet potatoes are harvested, they can be sorted. Sorting is done to select clean, fresh and not defective tubers. Sorting can also be done at the time of extraction or harvest. Post-harvest handling of sweet potatoes is usually aimed at maintaining shelf life. The sweet potato is cleaned (washed or brushed) then let it air. Sweet potato storage should be done at a room temperature between 27-30 C° with humidity between85-90%. [2] The washing process of Cilembu Sweet Potatoes in Cilembu Village, Pamulihan District, is currently by such as a cleaning process requires a relatively long time, namely 30 kg.hour -1 with a need for 4 (four) workers. 2. RESEARCH METHODS The research method used in this research is the engineering method, which is a design activity that is not routine, so that there is new construction in it, both in the form of a process and a product.[3] Tools and Materials The tools used for this research were a grinding machine (Makita, 11000 rpm), Electric Welding (Input power voltage 230 Volt, 250 Amp, 85% efficiency Frado 230 volts, 250 amperes), Plate Folding Tool (EdwardsTruefolds, clamp length 2 m) , a laptop (HP Notebook 240 G6 i3-6006U 4GB 500 GB vg), CAM software (Solidworks 2018), Programming language software (Matlab R2014a), Calculator (Casio type ƒx-82Es), a camera, a stopwatch (0.01-second accuracy), Digital Scale (maximum load 15 kg), Tachometer (Krisbow K W06-302, accuracy 1 rpm), Sound level meter (Lutron SL-4010), Vibration cashew (Lutron VB-8200), Clamp-on-meter (Hioki 3286- 20). The materials used in this study are divided into test materials and construction materials. The test material used in this study was Cilembu Sweet Potatoes used in washing testing.[4] The research procedure carried out is presentedin figure 1. ISSN 2347 - 3983 Volume 9. No. 8, August 2021 International Journal of Emerging Trends in Engineering Research Available Online at http://www.warse.org/IJETER/static/pdf/file/ijeter09982021.pdf https://doi.org/10.30534/ijeter/2021/09982021