Jurnal Eltek最新文献

{"title":"Analisa response transient cascade control temperature dan pressure pada furnace PT. Z menggunakan metode direct synthesis","authors":"Anggellieqque Karadeit, A. Dewi","doi":"10.33795/eltek.v21i2.4508","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.4508","url":null,"abstract":"Furnace pada PT. Z adalah furnace yang berfungsi untuk memanaskan heavy naptha hingga mencapai temperature 513℃ sebelum masuk ke rekator. Pada furnace menggunakan sistem pengendalian cascade temperature dan pressure untuk menjaga temperature outlet furnace dengan mengatur besarnya tekanan fuel gas untuk proses pembakaran yang masuk ke furnace. Temperatur Indicator Controller berperan sebagai master control yang memiliki aksi direct dengan mode controller Proportional Integral Derivative (PID) yang dalam kondisi operasinya mempunyai nilai Kp=75, τi=375, τd=2. Sedangkan Pressure Indikator Controller berperan sebagai sleve control yang memiliki aksi direct dengan mode controller Proportional Integral Derivative (PID) yang dalam konsisi operasinya mempunyai nilai Kp=1000, τi=1500, τd=0. Dari hasil simulasi menggunakan kondisi aktual diperoleh delay time 16,302s, settling time 2,8288s, rise time 0,2686s serta terdapat overshoot 19,880% dan undershoot 1,725%. Sedangkan hasil simulasi menggunakan metode direct synthesis diperoleh delay time 33,445s, settling time 10,5639s, rise time 5,557s, overshoot 0,0054% dan tidak terdapat undershoot. Berdasarkan perbandingan antara kondisi aktual dan metode direct synthesis dilihat bahwa walaupun terdapat keterlambatan untuk mencapai kondisi steady state namun dengan metode direct synthesis ini, dapat menghilangkan keadaan overshoot dan undershoot yang muncul pada kondisi aktual yang dianggap dapat mengurangi kinerja sistem. Oleh karena itu metode direct synthesis bisa dikatakan mempunyai respon sistem yang baik. ABSTRACT Furnace at PT. Z is a furnace whose function is to heat heavy naptha to a temperature of 513℃ before entering the reactor. The furnace uses a cascade temperature and pressure control system to maintain the furnace outlet temperature by regulating the amount of fuel gas pressure for the combustion process that enters the furnace. The Temperature Indicator Controller acts as a master control which has direct action with Proportional Integral Derivative (PID) controller mode which in operating conditions has values Kp=75, τi=375, τd=2. Meanwhile, the Pressure Indicator Controller acts as a control arm which has direct action with Proportional Integral Derivative (PID) controller mode which in its operating conditions has the values Kp=1000, τi=1500, τd=0. From the simulation results using actual conditions, the delay time was 16.302s, settling time was 2.8288s, rise time was 0.2686s and there was an overshoot of 19.880% and an undershoot of 1.725%. Meanwhile, the simulation results using the direct synthesis method obtained a delay time of 33.445s, settling time of 10.5639s, rise time of 5.557s, overshoot of 0.0054% and no undershoot. Based on a comparison between actual conditions and the direct synthesis method, it can be seen that although there is a delay in reaching steady state conditions, the direct synthesis method can eliminate overshoot and undershoot conditions that appear in actual condit","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139309981","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":"Implementasi sistem kontrol penggerak motor stepper pada proses molding microplastic berbasis PID menggunakan PLC","authors":"Alvian Anggiana Putra Anggiana, M. Rifa’i, H. Safitri","doi":"10.33795/eltek.v21i2.2024","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.2024","url":null,"abstract":"Industri saat ini telah memasuki era yang setiap proses produksinya telah menerapkan otomatisasi dan pertukaran data dalam manufakturnya yang dikenal sebagai era industri 4.0.  Era Industri 4.0 juga memberikan dampak pada industri percetakan barang seperti percetakan barang dari bahan plastik yang penerapannya  menggunakan teknik injection molding. Teknik ini mampu menghasilkan produk yang lebih presisi. Dalam proses injection molding perlu sistem kontrol yang baik agar mampu mengarahkan biji plastik dalam proses mold sesuai yang direncakan. Tentunya dibutuhkan aktuator yang meliputi penggerak yang dalam hal ini bisa berupa motor stepper.  Penelitian ini bermaksud ingin mengaplikasikan metode PID dalam mengontrol motor stepper pada proses molding microplastic.  Sistem yang diusulkan telah berhasil dibuat dan mampu menghasilkan produk sesuai dengan perencanaan. Hasil kontrol pada motor stepper yang paling tepat pada nilai parameter PID yakni nilai Kp = 14,  nilai Ki = 0.007 dan nilai Kd = 7000. Perubahan nilai setpoint dari 2500 hingga 2700 memberikan pengaruh terhadap hasil cetakan dan nilai setpoint yang menghasilkan cetakan yang paling bagus pada nilai setpoint sebesar 2700. Nilai setpoint sebesar 2700 menghasilkan kondisi mold dan nozell  dalam posisi yang tepat atau rapat, hal ini membuat proses cetakan berjalan dengan baik sesuai dengan desain dari cetakan yang diberikan. ABSTRACTThe current industry has entered an era where every production process incorporates automation and data exchange in its manufacturing. This era is known as Industry 4.0. Industry 4.0 has had a significant impact on various industrial sectors, particularly in the production of plastic goods using techniques such as injection molding. This process is capable of producing more precise products. In the injection molding process, a well-controlled system is needed to guide plastic pellets according to the intended mold design, utilizing actuators like stepper motors. This research aims to apply the PID (Proportional-Integral-Derivative) method to control stepper motors in microplastic molding processes. The proposed system has been successfully implemented and can produce products according to the planned specifications. The most suitable PID parameter values for controlling the stepper motor are Kp = 14, Ki = 0.007, and Kd = 7000. Changing the setpoint value from 2500 to 2700 has an impact on the molding results, with the best results achieved at a setpoint value of 2700. A setpoint value of 2700 ensures that the mold and nozzle are in the correct, tight position, allowing the molding process to proceed smoothly in line with the provided design.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139310427","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":"Peningkatan efisiensi sistem PLTS melalui optimasi susunan array panel surya","authors":"Muchlishah Muchlishah, Nuha Nadhiroh, Dimas Adi Nugroho, Ashwin Imaduddin","doi":"10.33795/eltek.v21i2.3191","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.3191","url":null,"abstract":"Letak geografis Indonesia sangat menguntungkan untuk pengembangan energi surya sebagai sumber energi listrik. Pembangkit listrik Tenaga Surya (PLTS) sangat cocok digunakan untuk mengatasi masalah pasokan listrik pada pulau-pulau di Indonesia. Beberapa faktor yang mempengaruhi daya luaran PLTS adalah iradiasi matahari, orientasi kemiringan modul surya, bayangan (shading), dan kenaikan temperatur. Bayangan merupakan masalah yang sangat penting karena dapat secara signifikan mempengaruhi efisiensi PLTS. Bayangan dapat ditimbulkan oleh pemasangan array modul surya dengan jarak yang tidak tepat (mutual shading) atau bangunan yang lebih tinggi disekitarnya. Penelitian ini bertujuan untuk meningkatkan efisiensi PLTS dengan meminimalisir efek mutual shading. Metode penelitian menggunakan eksperimental dengan mengumpulkan data primer berupa peak sun hour, iradiasi matahari, dan titik lokasi pengujian untuk mendapatkan potensi daya PLTS. Data sekunder merupakan data yang diperoleh dari pustaka terkait. Tahapan selanjutnya adalah pembuatan modul PLTS off grid dengan beberapa array modul surya sebagai peralatan uji. Pengambilan data dilakukan dengan variable bebas berupa jarak antar array, posisi array, iradiasi matahari, kondisi lingkungan, sedangkan variable terikat pada penelitian ini adalah nilai efisiensi PLTS. Dari hasil pengujian variasi sudut kemiringan panel surya dan variasi jarak antar array panel surya dapat disimpulkan bahwa topologi optimal pemasangan panel surya dengan ketinggian 10 cm adalah dengan sudut kemiringan 150 dan jarak antar array sebesar 20 cm.
 ABSTRACTIndonesia's geographical location is very favorable for the development of solar energy as a source of electrical energy. Solar power plants (PLTS) are very suitable to be used to overcome the problem of electricity supply on the islands in Indonesia. Several factors that affect the output power of PV mini-grid are solar irradiation, solar module tilt orientation, shading, and temperature rise. Shadow is a very important problem because it can significantly affect the efficiency of PV mini-grid. Shadows can be caused by installing an array of solar modules that are not properly spaced (mutual shading) or taller buildings in the vicinity. This study aims to increase the efficiency of PV mini-grid by minimizing the effect of mutual shading. The research method is experimental by collecting primary data in the form of peak sun hour, solar irradiation, and test location points to obtain the power potential of PLTS. Secondary data is data obtained from related libraries. The next stage is the manufacture of off-grid PLTS modules with several arrays of solar modules as test equipment. Data retrieval is carried out with independent variables in the form of distance between arrays, array position, solar irradiation, environmental conditions, while the dependent variable in this study is the value of PLTS efficiency. From the results of testing variations in the angle of inclination of ","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136069521","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":"Rancang bangun alat kasir barang otomatis berbasis RFID","authors":"Galih Hendra Wibowo, Sepyan Purnama Kristanto, Junaedi Adi Prasetyo, Richo Malvin Aprilieno","doi":"10.33795/eltek.v21i1.365","DOIUrl":"https://doi.org/10.33795/eltek.v21i1.365","url":null,"abstract":"Seiring berjalannya waktu, kemajuan teknologi terus berkembang di berbagai bidang, salah satunya supermarket. Persaingan supermarket di pasar global sangatlah sengit, khususnya pada aspek pelayanan kepuasan konsumen saat bertransaksi. Permasalahan antrian panjang dan menunggu menjadi faktor menurunnya tingkat kepuasan konsumen. Teknologi barcode yang digunakan dalam transaksi di supermarket tidak jarang menemui permasalahan seperti pembacaan barang dilakukan manual dan posisi barang dengan reader yang harus sesuai. Teknologi RFID menjadi alternatif dalam identifikasi barang dengan memanfaatkan radio frekuensi dan digunakan dalam pengembangan alat kasir barang otomatis. Alat kasir barang dilengkapi dengan conveyor sebagai media penggerak otomatis barang untuk diidentifikasi. Proses identifikasi dilakukan dengan pengecekan data di dalam database melalui mikrokontroller. Alat ini mampu mendeteksi RFID tag pada barang (didalam kantong plastik ataupun tidak) dengan baik. Tingkat identifikasi RFID tag pada barang mencapai 100%. Alat dapat berfungsi dengan optimal dalam pembacaannya dengan jarak 0 - 2.5 cm dari RFID Reader dengan nilai 100%. Alat ini dilengkapi dengan keranjang sebagai media penampung barang hasil identifikasi dengan nilai rata-rata fungsionalitas sebesar 87% atau sebanyak tiga buah barang.
 ABSTRACTAs time goes by, technological advances continue to develop in various fields, one of which is supermarkets. Supermarket competition in the global market is very fierce, especially in terms of service, especially customer satisfaction during transactions. The problem of long queues and waiting is a factor in decreasing the level of customer satisfaction. Barcode technology used in supermarket transactions often encounters problems such as manual reading of goods and the position of the goods with the reader that must match. RFID technology is an alternative in identifying goods by utilizing radio frequency and is used in the development of automatic goods cashiers. The goods cashier is equipped with a conveyor as a medium for automatically moving goods to be identified. The identification process is carried out by checking the data in the database through a microcontroller. This prototype is able to detect RFID tags on goods (in plastic bags or not) properly. The identification rate of RFID Tags on goods reaches 100%. The prototype can function optimally in reading with a distance of 0 - 2.5 cm from the RFID Reader with a value of 100%. This prototype is equipped with a basket as a medium for holding identified items with an average functionality value of 87% or as many as three items.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"59 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136069500","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":"Rancang bangun inverter sinusoida dengan frekuensi variabel","authors":"Moh. Luqman, Bambang Priyadi, A. Sumarno","doi":"10.33795/eltek.v21i2.3322","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.3322","url":null,"abstract":"Alat untuk mengubah daya dc menjadi daya ac disebut dengan inverter. Inti dari inverter sinusoida terletak pada kontrol switching, dimana bentuk gelombang dan frekuensi ditentukan pada alat kontrol, salah satunya adalah gelombang SPWM. Dipasaran telah tersedia pembangkit SPWM seri EGS-002, yang beroperasi pada frekuensi tetap 50 HZ atau 60 Hz, sehingga tidak bisa di gunakan untuk membangkitkan listrik dengan frekuensi variabel. Sebagai pembangkit sinyal SPWM dan penentu frekuensi variabel digunakan mikrokontroller arduino Uno. Frekuensi yang direncanakan adalah 10Hz sampai dengan 50Hz. Kontrol frekuensi direncanakan menggunakan variabel resistor. Sebagai driver switching menggunakan H-bridge jenis L-298 yang sudah tersedia dalam bentuk modul driver motor L-298 dan transformator konvensional sebagai penaik tegangan. Hasil yang telah dicapai adalah inverter yang bisa menghasilkan sinyal SPWM dengan frekuensi bisa diatur mulai 9,7Hz sampai dengan 58,14Hz melalui variabel resistor eksternal. Dan sesudah melalui tranformator/ filter akan menghasilkan sinyal sinusoida dengan frekuensi yang sama. ABSTRACT A device for converting dc power into ac power is called an inverter. The essence of the sinusoidal inverter lies in the switching control, where the waveform and frequency are determined by the controller, one of which is the SPWM waveform. In the market, there is an EGS-002 series SPWM generator, which operates at a fixed frequency of 50 Hz or 60 Hz, so it cannot be used to generate electricity with variable frequency. As a SPWM signal generator and variable frequency determinant, Arduino Uno microcontroller is used. The planned frequency is 10Hz to 50Hz. Frequency control is planned using a variable resistor. As a switching driver, it uses an L-298 type H-bridge which is already available in the form of an L-298 motor driver module and a conventional transformer as a voltage booster. The result that has been achieved is an inverter that can produce SPWM signals with adjustable frequency from 9.7Hz to 58.14Hz through an external variable resistor. And after going through the transformer / filter will produce a sinusoidal signal with the same frequency.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139310763","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":"Studi penyebab dan penanganan fail detection pada shinkawa vibration sensors unit circulating water pump di PT. X menggunakan metode root cause failure analysis","authors":"Zidny Alfian Barik, Suka Handaja","doi":"10.33795/eltek.v21i2.4610","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.4610","url":null,"abstract":"Circulating Water Pump merupakan salah satu equipment penting pada proses operasi di PT X. Oleh karena itu sistem permesinan harus dijaga dan dirawat dengan baik agar selalu dalam kondisi yang prima. Untuk meningkatkan kehandalan, sistem dipasang pendeteksi getaran yang akan membuat sistem menjadi trip untuk menghindari dari kerusakan yang fatal dengan memasang Shinkawa Vibration Sensor yang akan mendeteksi kerusakan bantalan yang dideteksi dengan adanya getaran berlebih. Prinsip kerja dari Shinkawa Vibration Sensor adalah dengan menggunakan Non-Contact Displacement Transducer yaitu dengan mengukur gap antara sensor dan bantalan. Pada artikel ini, sistem pendeteksi getaran mengalami fail detection, sistem trip tetapi semua peralatan dan bantalan dalam kondisi baik. Berdasarkan analisa menggunakan Root Cause Failure Analysis disimpulkan penyebabnya adalah adanya getaran akibat petir. Untuk itu dilakukan penanganan dengan setting ulang agar tidak terulang kembali   ABSTRACTThe Circulating Water Pump is one of the important equipment in the operational process at PT X. Therefore, the machinery system must be maintained properly so that it is always in prime condition. To increase reliability, a vibration detector is installed in the system which will trip the system to avoid fatal damage by installing a Shinkawa Vibration Sensor which will detect bearing damage which is detected by excessive vibration. The working principle of the Shinkawa Vibration Sensor is to use a Non-Contact Displacement Transducer, namely by measuring the gap between the sensor and the bearing. In this article, the vibration detection system experienced failed detection, the system tripped but all equipment and bearings were in good condition. Based on analysis using Root Cause Failure Analysis, it was concluded that the cause was vibrations caused by lightning. For this reason, handling is carried out by resetting so that it does not happen again.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"33 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139309761","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":"Sintesis Dan Karakterisasi Material Katoda LiMn0,7Fe0,3-xNixPO4/C Dengan 0 ≤ X ≤ 0,2 Dalam Aplikasi Baterai Litium-Ion","authors":"Rudiyansah Rudiyansah, Anne Zulfia S, Bambang Prihandoko","doi":"10.33795/eltek.v21i2.4393","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.4393","url":null,"abstract":"Pati singkong sebagai karbon pelapis bahan aktif LiMnPO4, Fe dan Ni (covalent-doping) ditempuh untuk meningkatkan konduktifitas elektronik-ionik, nilai specific capacity dan working voltage. Proses solid state reaction berupa ball milling (330 rpm, 48 jam) dan sintering (800°C, 2 jam) digunakan dalam pembuatan bahan aktif. Pola difraksi LiMnPO4 terlihat pada uji XRD pada bahan aktif. Bahan aktif terlapisi karbon berukuran 290 nm dan ukuran kristalit 60 nm terbentuk melalui proses Ball Milling. Pengujian SEM memperlihatkan pertumbuhan pelapisan karbon kearah horizontal dan pengujian EDX menunjukkan kadar Mn yang tinggi mengkonfirmasi peran pati singkong sebagai fasilitator pengintian pelapisan karbon. Nilai vibrasi v1 - v4 (1138 dan 1098 cm-1) hasil pengujian FTIR menunjukkan polianion  terbentuk. Pelapisan karbon memberikan nilai konduktifitas elektronik-ionik sebesar 1 x 10-3 S/cm dan 7,2 S/cm, peningkatan nilai konduktifitas elektronik terjadi akibat penambahan Ni. LiMn0,7Fe0,25Ni0,05PO4/C memberikan nilai specific capacity oksidasi 60,92 mAh/gr dan nilai Voks-red sekitar 4,13 Volt dan secara praktikal dapat digunakan sebagai bahan aktif katoda baterai Li-Ion. ABSTRACT Carbon-coating process with starch of cassava in LiMnPO4 active material, co-subtitution by adding Fe and Ni have been used to enhance ionic-electronic conductivity, specific capacity, and working voltage. Pattern diffraction of XRD shown LiMnPO4 structure have been formed via milling process (330 rpm, 48 hours) and sintering process (800°C, 2 hours) as called as solid state reaction. Ball Milling produced active material with the particle size and crystallite size up to 290 nm and 60 nm respectively. Carbon-coating have been grown in horizontal direction in cathode material become an evidence that the starch of cassava have been facilitates nuclea of carbon-coating to grown in cathode material and can be seen by SEM, and also the high content of Mn that have founded by EDX evaluation agreed. Polyanion  have formed and indicated by vibration value of v1 - v4 (1138 and 1098 cm-1) during FTIR evaluation. Electronic conductivity increased up to 1 x 10-3 S/cm by carbon-adding process, and Ni-addition as cation-doping contributed also. LiMn0.7Fe0,25Ni0.05PO4/C of cathode material shown the highest specific capacity oxidation near 60.92 mAh/gr and Voxidation/reduction around 4.13 Volts and practically can be used as Li-Ion battery.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139310096","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":"Analisis keandalan sistem trafo step down menggunakan metode logika fuzzy","authors":"Andie Emirwati, Linda Sartika, A. Prasetia","doi":"10.33795/eltek.v21i2.3671","DOIUrl":"https://doi.org/10.33795/eltek.v21i2.3671","url":null,"abstract":"Trasformator step down adalah sebuah perangkat elektronik yang memiliki fungsi utama untuk menurunkan tegangan listrik ke level yang lebih rendah. Data yang digunakan dalam analisis ini berasal dari hasil pengukuran di PT. PLN Tarakan yang dilakukan selama beberapa bulan pada tahun 2021, diantaranya bulan Januari, Februari, Agustus, dan September. Data pengukuran ini kemudian diolah dengan menggunakan metode fuzzy untuk mencapai keseimbangan yang diinginkan. Menurut standar Std.446-1980, keseimbangan beban yang diharapkan berkisar antara 5 hingga 20%. Sebelum menerapkan metode fuzzy Mamdani, hasil analisis menunjukkan bahwa pada bulan Februari, transformator YDS 191 memiliki ketidakseimbangan arus beban tertinggi yaitu 46,1%, sedangkan transformator SLM 377 memiliki tingkat ketidakseimbangan terendah yaitu 20,7%. Namun, setelah menerapkan metode Fuzzy Mamdani, hasil analisis menunjukkan perbaikan yang signifikan. Ketidakseimbangan arus beban tertinggi yang tercatat adalah 17% pada transformator YDS 083 di bulan Agustus, sedangkan transformator SLM 241 di bulan Februari mencapai ketidakseimbangan sebesar 2,6%. Hasil ini menunjukkan bahwa penerapan logika fuzzy Mamdani efektif dalam mengurangi ketidakseimbangan arus beban. Hasil ini memberikan bukti yang kuat bahwa penggunaan metode Fuzzy Logic dengan FIS Mamdani mampu menurunkan ketidakseimbangan arus beban hingga di bawah batas maksimum yang ditetapkan oleh Standar PLN Nomor 1 Tahun 1995, yaitu sebesar 20%. ABSTRACT Step down transformer is an electronic device that has the main function to reduce the voltage to a lower level. The data used in this analysis comes from the measurement results at PT PLN Tarakan which were carried out for several months in 2021, including January, February, August and September. This measurement data is then processed using fuzzy methods to achieve the desired balance. According to the Std.446-1980 standard, the expected load balance ranges from 5 to 20%. Before applying the Mamdani fuzzy method, the analysis results showed that in February, transformer YDS 191 had the highest load current imbalance of 46.1%, while transformer SLM 377 had the lowest imbalance level of 20.7%. However, after applying the Fuzzy Mamdani method, the analysis results showed significant improvements. The highest load current unbalance recorded was 17% at transformer YDS 083 in August, while transformer SLM 241 in February achieved an unbalance of 2.6%. These results show that the application of Mamdani fuzzy logic is effective in reducing load current imbalance. These results provide strong evidence that the use of the Fuzzy Logic method with FIS Mamdani is able to reduce the load current imbalance to below the maximum limit set by PLN Standard Number 1 of 1995, which is 20%.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139311302","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":"Penggunaan metode string matching pada sistem informasi mahasiswa Polinema dengan chatbot","authors":"Rizky Ardiansyah, D. Marya, Atik Novianti","doi":"10.33795/eltek.v21i1.381","DOIUrl":"https://doi.org/10.33795/eltek.v21i1.381","url":null,"abstract":"Pelayanan kampus yang baik sangat penting untuk menunjang proses belajar mengajar di perguruan tinggi. Salah satu cara untuk meningkatkan pelayanan adalah dengan menggunakan chatbot. Chatbot dapat memberikan pelayanan yang cepat dan efisien kepada mahasiswa, serta membantu dalam mendapatkan informasi yang dibutuhkan. Chatbot dapat memberikan pelayanan yang efektif dan efisien dalam menyediakan informasi dan melakukan transaksi. Penggunaan chatbot juga mengurangi beban kerja petugas administrasi dan memungkinkan mereka untuk fokus pada tugas yang lebih kompleks. Meskipun demikian, perlu perbaikan dalam aspek keamanan data dan privasi. Penelitian ini bertujuan untuk menguji aplikasi chatbot pelayanan administrasi dengan menggunakan metode string matching. Pengujian dilakukan melalui beberapa tahap, termasuk pengujian fungsi, interaksi, kompatibilitas, keamanan, dan performa chatbot. Hasil pengujian menunjukkan bahwa chatbot memiliki tingkat akurasi sebesar 90% dengan metode string matching. Mayoritas mahasiswa merasa puas dengan kecepatan dan akurasi respon chatbot. Selain itu, aplikasi ini juga dianggap mudah digunakan oleh mahasiswa. \u0000ABSTRACTCampus services are crucial for supporting the teaching and learning process in higher education institutions. One effective approach to enhance these services is through the implementation of chatbots. Chatbots provide prompt and efficient assistance to students, enabling them to easily access the necessary information. They offer an efficient and effective means of delivering services by providing accurate information and facilitating transactions. Furthermore, the utilization of chatbots alleviates the burden on administrative staff, allowing them to focus on more complex tasks. However, it is important to address and improve data security and privacy aspects. This research aims to evaluate an administrative service chatbot using the string matching method. The evaluation process encompasses assessing the chatbot's functionality, interaction capabilities, compatibility, security measures, and overall performance. The results demonstrate an impressive 90% accuracy rate achieved through the implementation of the string matching method. The majority of students’s express satisfaction with the chatbot's promptness and accuracy in providing responses. Additionally, the application is highly regarded for its user-friendly interface, as reported by the students.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45065754","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":"Desain kontrol adaptif L1 dengan band pass filter orde dua untuk pengendali vibrasi pada rotor helikopter","authors":"Farida Gamar, Rusdhianto Effendie Abdul Kadir, Achmad Jazidie","doi":"10.33795/eltek.v21i1.380","DOIUrl":"https://doi.org/10.33795/eltek.v21i1.380","url":null,"abstract":"Vibrasi pada helikopter menjadi konsentrasi tersendiri untuk terus ditingkatkan penanganannya. Hal ini dikarenakan selain dapat menyebabkan kerusakan struktur badan helikopter jika vibrasi yang dihasilkan terlalu besar juga berpengaruh pada kenyamanan pilot dan penumpang. Sistem vibrasi pada helicopter terdiri dari baling-baling, rotor mount, dan suspensi dimana terdapat damper sebagai peredam. Pada penelitian ini, digunakan damper semi aktif yang variabelnya dikontrol dengan menggunakan kontrol adaptif L1 berbasis analisis Fourier dari vibrasi yang dihasilkan oleh rotor. Analisis Fourier digunakan untuk mencari frekuensi cutoff vibrasi yang digunakan untuk penalaan pada kontrol adaptif L1. Hasil rancangan band pass filter orde 2 pada sistem dapat memperbaiki respon percepatan hingga 72.52% pada rotor mount dan 65.94% badan helicopter dalam waktu 2 detik. Hasil rancangan juga dapat menangani kesalahan perpindahan sebesar 55.6% pada rotor mount dan 55.56% pada badan helikopter dalam waktu 2 detik. Perbaikan respon percepatan pada badan helicopter yang mencapai 0 m/s2 telah memenuhi rekomendasi NASA untuk minimal percepatan pada sistem vibrasi helikopter. \u0000ABSTRACT \u0000 Vibration in helicopters is a separate concentration to continue to improve its handling. This is because, in addition to causing damage to the helicopter body structure if the vibration generated are too large, it also affects the comfort of pilot and passengers. The vibration system on the helicopter consists of propeller, rotor mount, and suspension where there are dampers as dampers. In this research, a semi-active damper is used whose variables are controlled using Fourier analysis-based L1 adaptive control of the vibrations generated by the rotor. Fourier analysis is used to find the cutoff frequency of vibration used for tuning the L1 adaptive control. The results of the second-order band pass filter design in the system can improve the acceleration response up to 72.52% on the rotor mount and 65.94% of the helicopter body within 2 seconds. The design results can also handle displacement errors of 55.6% on the rotor mount and 55.56% on the helicopter body within 2 seconds. The improvement of the acceleration response on the helicopter body which reaches 0 m/s2 has required NASA's recommendations for minimum acceleration in helicopter vibration systems.","PeriodicalId":53405,"journal":{"name":"Jurnal Eltek","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41583014","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}