Injection: Indonesian Journal of Vocational Mechanical Engineering

ALAT PEMOTONG PLAT SISTEM GESER

Ismael Marjuki, Betti Ses Eka Polonia, Hairian Rahmadi — Thu, 02 May 2024 00:00:00 +0000

The process of cutting steel plates is often found in small and large industries. Cutting is also a process of separating and reducing one solid object into two or more that are directed, modifying, forming, and removing unnecessary parts using cutting tools. Some common problems when using a hand grinder are user safety from sparks and dust. In addition, physical injury factors due to misuse and broken discs or grinding wheels can also occur during operation. Based on this, the author designed a tool that can cut plates safely and neatly. This tool's advantage is that it is safer and more efficient because it uses a sliding system. A plate-cutting tool with a sliding system has dimensions of 126.5 cm frame length, 50 cm width, and 20 cm frame height. Process the plate-cutting tool frame using a hollow iron measuring 40x40 mm and a grinding machine with a speed of 12,000 rpm.

MENTAL WORKLOAD ANALYSIS ON ADARO SERVICE SITE ADMO STAFF OFFICERS USING THE NASA-TLX METHOD

Darsini Darsini, Andi Wahyu Purnomo — Thu, 29 Feb 2024 00:00:00 +0000

Human Resources (HR) is a workforce, employees, who work in a company. Human resources in a company are one of the important aspects to increase the effectiveness and efficiency of a company. Staff Officer is one part of the company that has an important role in carrying out production activities. Adaro Service Company in the department plant has a Key Performent Indicator PA target of 92%, this target triggers increased fatigue for staff officers, and creates an effect of excessive mental workload, thus reducing productivity figures. This study aims to analyze the mental workload on staff officers, and find out what factors cause the mental workload of staff officers. The method used in this study is the NASA-TLX method. The results of this study indicate that the level of mental workload indicators for staff officers is in the high category. The highest indicator is the Frustration Level (TF) score of 24%, and factors that cause high mental workload are influenced by human factors and method factors

RANCANG BANGUN PERAHU TANPA AWAK TENAGA SURYA (PETATES) Auto Feeder

Thu, 29 Feb 2024 00:00:00 +0000

Feeding fish in pond-based aquaculture involves the hand distribution of food by individuals around the pond's perimeter. Farmers utilize boats to achieve extensive food delivery. Technological advancements have facilitated the creation of self-feeder or dement-feeder statistical techniques. This device functions autonomously to provide feed at regular intervals and has a predetermined coverage area at its designated position on the periphery of ponds. Due to its peripheral location, the technology deployment system has limited capacity to distribute feed across the entire pond area, making it less effective for use in big ponds. Hence, it is imperative to develop a solar-powered unmanned boat (Petates) equipped with an Auto Feeder system to regulate the feeding process in shrimp and fish farming. This study aims to develop a solar-powered unmanned boat design for fish and shrimp farming that can efficiently distribute feed across the pond. Additionally, the research aims to assess the impact of feeding machines on the conversion of feed by fish and shrimp. The research results show that the maximum floating weight of the boat is 48.7 kg using two solar-powered electromotor-driven buoys. The boat has a maximum speed acceleration of 2.4 m/s, achieved through a well-balanced and efficient bow acceleration. Experiments were conducted using two distinct feed types: type 781-2 with a diameter ranging from 2.3 to 3 mm, and type 781-3 with a diameter ranging from 3.2 to 4 mm. The throwing distance for the feed is between 8 and 10 meters, and between 7 and 8 meters. The feed spreading rate for each minute is 950 grams and 1,080 grams, with a feed capacity of 7 kilograms and 6 kilograms respectively.

ANALISIS EFISIENSI THERMAL TERHADAP ENGINE TURBOFAN PESAWAT BOEING 737-500

Edi Sofyan, Yoseph Alexandro Grandy, Ferry Setiawan, Muh Anhar — Thu, 29 Feb 2024 00:00:00 +0000

Thermal efficiency is a dimensionless measure that shows the incoming heat is the energy obtained from the energy source. The cooled output may be either heat or work, or it may be both. The CFM56-3 engine is a turbofan jet engine with large bypass capacity, dual rotor used with advanced axial flow technology designed for use on BOEING737 aircraft and all its variants. The purpose of this study is to determine the thermal efficiency of a turbofan engine, the causes of decreased performance of a turbofan engine and efforts to overcome it. This research is a qualitative and quantitative research using primary data and secondary data. Data collection techniques used are field studies, literature studies, as well as discussion and problem analysis. The field study in this research is to make direct observations of the processes that occur in the field. The results of this study can be concluded that the thermal efficiency of the Boeing 737-500 aircraft occurs the higher the difference between the incoming energy and outgoing energy through the compressor is 49.11% and the turbine is 64.01% the system produces the ideal thermal efficiency value of the Brayton cycle of 70 ,51% produced will be higher while the actual thermal efficiency of the Brayton cycle of 44.0% has decreased compared to the ideal thermal efficiency. The comparison of the ideal thermal efficiency of the Brayton cycle and the actual thermal efficiency of the Brayton cycle is 26.51%, meaning that efficiency can still be increased by as much as possible returning the component dimensions to their proper condition. The cause of the decreased performance of the turbofan engine is a change in dimensions due to frictional materials; wear and tear caused by continuous operation; as well as incorrect operating steps on the turbine engine and efforts to overcome them are periodic inspections of each turbofan engine components and using accurate measuring instruments