Jurnal POLIMESIN最新文献

{"title":"Analysis of liquid rocket propellant in nitroglycerin injector reactors","authors":"maryono maryono, Muhammad Akhlis Rizza","doi":"10.30811/jpl.v21i3.3826","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3826","url":null,"abstract":"The propulsion of the rocket is due to the thrust resulting from the combustion rate. The propellant energy can be increased by increasing the fuel pressure and temperature of the propellant. Increasing the pressure and temperature of the propellant will increase its combustion rate and the operating conditions of the rocket motor. The most effective liquid propellant used is Nitroglycerin (NG). Nitroglycerin was prepared using the glycerol nitration method with the principle of an injector-based reactor. Therefore, in this research, nitroglycerin was made using the Injector Reactor method with variations in flow rate and injection volume. The results showed that the effect of variations in flow rate and solution volume on the synthesis of nitroglycerin caused a change in solution temperature. Flow rate is closely related to the volume of solution used. The higher the temperature produced, the more heat energy will increase so that the pressure and combustion rate of the propellant increase. The most optimum results use a flow rate of 200 µm/s and a solution volume of 6 ml of glycerin, nitric acid, and sulfuric acid each with a temperature of 37.6oC.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent trends in sustainable modelling for hydrogen production and utilization","authors":"April Lia Hananto, Muhammad Idris Idris, Ihwan Ghazali Ghazali","doi":"10.30811/jpl.v21i3.3306","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3306","url":null,"abstract":"Hydrogen is a promising candidate for the future of energy and global economic security owing to its cost-efficient clean and environmentally friendly nature. The utilisation of hydrogen is, however, not without obstacles. Technology maturity and the unattractive market are some of the challenges. Before hydrogen can be used on a large-scale basis, critical technical challenges need to be addressed, such as the economical production and transportation and storage issues. In terms of energy prices, hydrogen is an inexpensive fuel. Ideally, a vehicle run on hydrogen reduces the cost per kilometre with better mileage than that of fuelled with fossil fuel. Electric vehicles run on hydrogen fuel cells, for instance, offer several performance improvements over conventional internal combustion engines. This includes better fuel efficiency and relatively less noise operation, yet one of the important technical challenges is onboard hydrogen storage. In this review article, recent trends in modeling for hydrogen production and utilization are addressed in detail.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136369472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AI-based face recognition system with telegram notification for room security on raspberry PI","authors":"Deni Kurnia, Afzeri Afzeri, Imam Muis H","doi":"10.30811/jpl.v21i3.3534","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3534","url":null,"abstract":"This research is based on the importance of a security system in a room by implementing AI combined with the telegram notification system. The goal is that security information can be obtained quickly and in real-time. The methodology used is to design a hardware system consisting of input, process and output devices. The input device consists of a Logitech C270 camera mounted on 2 MG966R type servo motors so that the camera can rotate on the X and Y axes, then the results of the camera captures are processed using the Haar Cascade Classifier and Local Binary Pattern Histogram (LBPH) algorithms. Raspberry Pi 4 is used as a data processing center and push notification to telegrams in the form of images when faces are detected by a web camera. Only registered users may enter the room, by opening the door when a face is recognized. Our findings show that a room security system with an AI-based facial recognition application can be implemented, according to the planning and design results in this study. The door opening process produces an average result of 4.586 seconds, with the longest time being 4.981 seconds and the fastest time being 4.116 seconds. The door closing process produces an average result of 4.496 seconds, with the longest time being 4.966 seconds and the fastest time being 4.106 seconds. The average time of opening and closing the door is ideal and safe. From the results of the research that has been done, it can be concluded that the use of AI in this study aims to make decisions that only registered users can enter a room. In addition, the ability of the camera to move dynamically on the x and y axes is one of the system developments that did not exist before, so that the ability to take pictures besides being more accurate also becomes wider dynamic.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on strain behavior of jute/polyester composite with an open hole under axial loading","authors":"Anggit Murdani, Utsman Syah Amrullah, R.N. Akhsanu Takwim","doi":"10.30811/jpl.v21i3.3931","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3931","url":null,"abstract":"Mechanical assembly requires joint mechanism involving fasteners and holes. Deformation of the holes will greatly affect the integrity of the mechanical joins. This research objective is to reveal the strain behavior of jute/polyester composite containing open hole under axial loading. It is very important to know the behavior of the strain surrounding the hole under loading. Experiments were carried out by preparing jute/polyester composites. The composites were manufactured by using a vacuum infusion method. There are two configurations of the number of laminations, i.e., 3 and 5 sheets and of hole sizes, i.e., 5 and 10mm holes. An axial load is applied to the specimen through a tensile test. Strain gauges are attached near the holes, axially and laterally. Strain in axial and lateral directions in the vicinity of a hole is recorded and presented. The research result shows that the strain gauges located parallel to the loading axis indicate a positivestrain value. On the other hand, the strain gauges located lateral to the loading axis indicate a negative value. Furthermore, the strain gauges located beside the hole in the direction parallel to the loading axis indicate the highest strain value in all types of specimens.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of cooling media on hardness and microstructural changes in S45C carbon steel during heat treatment process","authors":"Bambang Hari Priyambodo, Reni Laili, Suhartoyo Suhartoyo","doi":"10.30811/jpl.v21i3.3846","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3846","url":null,"abstract":"S45C Carbon steel is commonly used in the manufacturing of structural or machine components due to its numerous advantages. However, to fulfill its intended purpose, the mechanical properties of this material require improvement. One approach to achieve this is through heat treatment using different cooling fluids. Therefore, this study aimed to examine the effect of varying cooling fluids on heat treatment of S45C carbon steel, specifically its hardness and microstructure changes. The experimental method employed involves heating the specimens in a furnace at 850oC for 30 minutes, followed by cooling using different fluids, namely water, ice water, and oil. The results showed that faster cooling led to an increase in hardness. In particular, the specimens cooled using water, ice, and oil yielded hardness values of 697 HV, 481 HV, and 248 HV, respectively. The highest hardness value of 697 HV was achieved using ice water, indicating an increase of around 281%. The phase changes observed on the surface of the specimen showed the dominance of martensite.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and discrete event simulation (DES) modeling analysis of the belt conveyor conveying capacity","authors":"Muas Muchtar, Syaharuddin Rasyid, Andi Saidah","doi":"10.30811/jpl.v21i3.3589","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3589","url":null,"abstract":"Belt conveyors can continuously move the desired amount of material from one location to another. The conveying capacity of the conveyor must be met based on the previous design criteria. The belt conveyor must operate at the appropriate conveying speed and queue time interval. Higher or lower conveyor speeds and queue time intervals can cause a decrease in efficiency and productivity. The objectives of this study are 1) to determine the effect of the independent variables (observations), namely, the speed of the head pully conveyor and the time interval of the box queue, on the conveyor performance, 2) to obtain information on the normality profile and significance of the conveyor performance data. This research is oriented toward experimental and quantitative research designs. The independent variables observed are the speed of the head pully belt conveyor and the box queuing time interval on the dependent variable, namely the belt conveyor conveying capacity. The data collection technique is in the form of direct measurements on the conveyor system and the collection of output data from the previously designed DES modeling. Two types of analysis used are comparative quantitative analysis methods and statistical-based analysis. The results showed a significant influence between the independent variables of speed and box queue time interval on the conveying capacity of the belt conveyor. Another result is that the conveyor capacity data obtained from this study have a near-normal distribution and a high significance level.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFD analysis in investigating the impact of turbine blade number on the performance of hydro turbine","authors":"Fatahul Arifin, Ade Putra Maulana, Indrayani Indrayani","doi":"10.30811/jpl.v21i3.3671","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3671","url":null,"abstract":"The demand for electrical energy in Indonesia is growing, and therefore more effort is required to fulfill this need. Indonesia has considerable hydropower potential due to its geographical location and climate, by utilizing areas that have this potential to support the government's renewable energy program to provide electricity to the community. Impeller turbines are one option in an effort to create renewable energy generation. In this study, a comparison of the number of turbine blades was carried out using the Computational Fluid Dynamics (CFD) method, three models are 11, 13, and 15 blade impeller turbines designed at water with a runner diameter of 200 mm, blade thickness of 2 mm and an angle of 30 degrees then simulated using Comsol Multiphysics against different water flow rates. The simulation results show that the 11-bladed turbine model I has better performance because it has a lower pressure value but has a better velocity value compared to the two models simulated","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of sintering temperature on crystal structure and physical properties of the Mg0,92Zn0,05C0,03 Alloy","authors":"Budiarto Budiarto, Susilo Susilo","doi":"10.30811/jpl.v21i3.3719","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3719","url":null,"abstract":"The effect of sintering temperature on the crystal structure and physical properties of the Mg0,92Zn0,05C0,03 alloy has been studied. Magnesium-based alloys are one of the alloys that have been used in industry, the health sector, and as biodegradable materials and biomaterials. The aim of this study was to determine the effect of temperature and sintering holding time on crystal size, dislocation density, microlattice strain, and yield strength, porosity and density of Mg0,92Zn0,05C0,03 alloy. The results of testing the crystal structure of the alloy Mg0,92Zn0,05C0,03 with an X-ray diffractometer showed several diffraction peaks consisting of the main phase α–Mg and a small part of the MgZn phase. Testing of Mg0,92Zn0,05C0,03 alloy after sintering with variations in temperature and 90 minutes holding time for crystal size showed that the higher the sintering temperature (425 0C to 575 0C) the crystal size value decreased significantly from 82.36 nm to 18.75 nm, and the dislocation density increased from 0.113 to 0.868 lines/mm2. For micro strain decreased from 0.015 to 0.0087. However, in the very small porosity test, the increase was from 29.8% to 31.9%. As well as for density (1.8 gr/cm3) and yield strength (274 MPa) there was no significant decrease of around 1.4%, but the synthesized Mg0,92Zn0,05C0,03 alloy fulfilled as a bone implant bio material.hhThe effect of sintering temperature on the crystal structure and physical properties of the Mg0,92Zn0,05C0,03 alloy has been studied. Magnesium-based alloys are one of the alloys that have been used in industry, the health sector, and as biodegradable materials and biomaterials. The aim of this study was to determine the effect of temperature and sintering holding time on crystal size, dislocation density, microlattice strain, and yield strength, porosity and density of Mg0,92Zn0,05C0,03 alloy. The results of testing the crystal structure of the alloy Mg0,92Zn0,05C0,03 with an X-ray diffractometer showed several diffraction peaks consisting of the main phase α–Mg and a small part of the MgZn phase. Testing of Mg0,92Zn0,05C0,03 alloy after sintering with variations in temperature and 90 minutes holding time for crystal size showed that the higher the sintering temperature (425 0C to 575 0C) the crystal size value decreased significantly from 82.36 nm to 18.75 nm, and the dislocation density increased from 0.113 to 0.868 lines/mm2. For micro strain decreased from 0.015 to 0.0087. However, in the very small porosity test, the increase was from 29.8% to 31.9%. As well as for density (1.8 gr/cm3) and yield strength (274 MPa) there was no significant decrease of around 1.4%, but the synthesized Mg0,92Zn0,05C0,03 alloy fulfilled as a bone implant bio material.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pellet moulding machine design and simulation analysis of the effect of angle variation in the mold hole on pellet alloy pressure","authors":"Husni Husni, Arif Faturrahman, Muhammad Rizal","doi":"10.30811/jpl.v21i3.2641","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.2641","url":null,"abstract":"The development of aquaculture in Indonesia has increased every year. However, in reality, farmers find failed fish harvests arising from fish feed problems. Various problems in the field occurred by fish farming business actors due to the incompatibility of the pallet molding machines used with the quality of raw materials and the high price of fish feed. For this reason, it is necessary to have a new technology in the form of a pellet molding machine to overcome the problems that often occur. This study aims to design a pellet molding machine with modifications to the angle of the mold hole and analyze changes in pressure values and production rates from the effect of the angle given to the mold to obtain a good mix of pellets and a shorter production speed. The method used is design and simulation, with machine variables that have been designed using angles of 30º, 45º, and 60º. The highest pressure value data is obtained at an angle of 45º with a maximum pressure value of 11.86 Pa and the lowest pressure value is at an angle of 30º with a maximum pressure value of 10.62 Pa. The highest speed value is obtained at an angle of 45º and 60º with a value of 4 .8 m/s and the lowest value is obtained at an angle of 30 o with a value of 4.7 m/s. In a pellet molding machine that uses an unmodified mold, the maximum pressure value is 10.36 and the speed is 4.6 m/s, which means that the angle at the mold hole gives an increase in pressure and production speed which will make the pellets have better mix and faster production time.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136369549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hardening of bucket teeth made from creusabro 8000 steel by using the induction hardening method","authors":"Darma Firmansyah Undayat, Cecep Ruskandi, Ari Siswanto","doi":"10.30811/jpl.v21i3.3672","DOIUrl":"https://doi.org/10.30811/jpl.v21i3.3672","url":null,"abstract":"Excavators are often used in mining projects such as for penetrating, excavating, dredging, gouging, and crushing mineral rocks. Bucket teeth are an excavator component that is often being replaced due to failure. The most common failure mode that occurred in bucket teeth was wear on the tip or front section of it. To reduce the wear of the bucket teeth material then its hardness should be increased. As the hardness value increases, the resistance to wear increases. The bucket teeth were made of Creusabro 8000 steel and a hardening process was then carried out on the front section of the bucket teeth components by using an induction furnace. The power used in the induction furnace varies from 28, 35, 42 and 49 kW (kilowatts) and the holding time varies between 3 and 5 minutes. The heat treatment process used oil as a cooling medium. The analysis was carried out to determine the area that experienced an increase in hardness and its occurred microstructure. Microstructure examination was carried out with an optical microscope, and hardness test by using a Vickers microscopy. It can be concluded from the result of the analysis that the large area experienced an hardness increase is directly proportional to the electric current magnitude and holding time. The microstructure has changed from fine pearlite to martensite thus hardness of Bucket Teeth can be increased up to 100% of the initial hardness.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136370296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}