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Helmi Gunawan
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Simetris
Published by Sekolah Tinggi Teknologi Ronggolawe Cepu
ISSN : 16937066     EISSN : 2686312X     DOI : https://doi.org/10.51901/simetris.v14i2.124
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
SIMETRIS: The Journal of Technology and Applied Science is a scientific journal published regularly every six months, namely June and December. SIMETRIS: Journal of Technology and Science Accepts articles from various groups covering the study and application of theory, research results, interesting conceptual ideas in the fields of engineering and applied science. The editorial team will decide on the selection of articles to be published after receiving the results from the expert editing team. Authors will be given input from the expert editing team. SIMETRIS: Journal of Technology and Applied Science contains research articles or literature studies in Indonesian and English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 148 Documents
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SISTEM INFORMASI TUGAS AKHIR BERBASIS WEB (Studi Kasus: Sekolah Tinggi Teknologi Ronggolawe Cepu) Erviana -; Joko Handoyo
SIMETRIS Vol 11 No 1 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

The final project is a scientific paper compiled by every final semester student to obtain a bachelor degree or three diploma basedon the problem or research as a graduation requirement in accordance with their respective fields. The process of final project guidance atRonggolawe High School of Engineering (STTR) Cepu which is still manual causing the students difficulties in face-to-face directly with thesupervisor or head of study program because of the timing of the less precise or less effective and there is no system information finalproject, Data has not been stored neatly.To overcome these problems it is necessary to design an Online Task Information System on High School Engineering Ronggolawe(STTR) Cepu. Online final project system to facilitate students in the process of making the final project.The author solve the problem using life cycle system (SDLC) method with waterfall model. The development of this system includesthe process of submitting the title made by the students to the head of study program, proposal guidance process and final report on thesupervisor. The result of the functionality test of the final assignment information system is considered feasible in terms of functionality, with100% result in black box testing for testing of sub-characteristics of suitability and accurancy. It is expected that this system can help thestudents in the final task guidance process to be more efficient and better.
APLIKASI TOOL PREDIKSI PENERIMAAN PESERTA DIDIK BARU MENGGUNAKAN ALGORITMA ANFIS (Studi Kasus: Sekolah Menengah Kejuruan Migas Cepu) Joko Handoyo
SIMETRIS Vol 11 No 2 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Students is important component in an educational institution, new students who enroll in Cepu Oil and GasVocational School in 2012 were 475, in 2013 were 526, in 2014 were 687, in 2015 were 785, 2016 were 648, and in 2017 were461. New students who register has increases and decreases for every year, it caused changes any policies taken by the schoolprincipal to optimize the provision of facilities and teaching force.The new student acceptance prediction is needed to support decision making and policy planning in the future,therefore the authors conducted a study to predict new student admissions based on the time series data obtained from CepuOil and Gas Majority High School in the form of prediction applications using the Adaptive Neuro algorithm Fuzzy InferenceSystem (ANFIS) which is processed using matlab. Predictive error value of manual calculation is calculated using MAPEmethod (Mean Absolute Percentage Error) and prediction error calculation with prediction application is calculated using theMAPE and RMSE methods (Root Mean Squared Errors).The results of this researches is the number of new students who enrolled in 2018 is 607,327 with a percent errorvalue of 0.00333682% calculated using the MAPE method and the average error of 0.151786 was calculated using the RMSEmethod. Predicted results can be used as references in supporting decision making by the Cepu Oil and Gas Vocational HighSchool Principal.
SISTEM INFORMASI ALUMNI (TRACER STUDY) BERBASIS WEB (Studi Kasus : Sekolah Tinggi Teknologi Ronggolawe Cepu) Novita Tiyana Putri; Joko Handoyo
SIMETRIS Vol 11 No 2 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

High school Technology Ronggolawe (STTR) Cepu was one of the colleges that have the obligation to provide the media withinformation about alumni in order for the establishment of good communication between fellow alumni. Therefore the authors do a researchby designing information systems alumni, such as courses, year of graduation, the place of work as well as other information related toalumni.The purpose of this research is able to collect and maintain accurate data and serves from alumni. The design of informationsystems is modeled into the diagrams in the UML (Unified Modeling Language). Programming using PHP-based Framework. FrameworkCodeIgniter developed to facilitate in developing application structure file source code using the approach the concept of MVC (Model ViewController). System development method of SDLC (System Development Life Cycle) in the model of the waterfall. The research of usingtesting functionality testing and black box testing.The results of test functionality of information systems alumni (tracer study) were declared worthy in terms of functionality, with100% results on black box testing. This research is expected to help high schools Technology Ronggolawe (STTR) Cepu in performing datastorage management and alumni.
Kekuatan Desak Kolom Komposit Baja Silinder Dengan Beton Serat Terhadap Pembebanan Eksentris SULISTIA SULISTIA
SIMETRIS Vol 11 No 2 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

In this study the column being modeled is the lowest column, the bottom of which is pinched and the other end free, by adding fiber to the concrete mix mixture. The addition of fiber as much as 1% -3% of heavy cement. The fiber used consists of a fiber tie wire with a diameter of 1 mm, a length of 60 mm and the two ends are bent. While the steel used in this study was 112,903 mm in diameter, 1,450 mm thick and 700 mm long.The results of the study are a strong test of the composite column pressure on the eccentric and centric loads ie on specimens without fiber material producing average moments and average maximum loads (14720,56250. 103 Nmm and 532,50.103 N), for fiber reserves 1 % (15535,625,103 Nmm and 557.5,103 N), for 2% fiber content (15647,675,103 Nmm and 625,103 N), for 3% fiber content (18235,00,103 Nmm and 650,00,103 N). It turns out that the results of this study indicate that the addition of fiber to the concrete mix increases the strong capacity for centric loading or eccentric loading.
Pola State Matrix Pada State Equations Representasi Rangkaian Tangga RL, RC, LC, dan RLC Seragam Ari Puji Prasetiyo
SIMETRIS Vol 11 No 2 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Sebagai suatu sistem linier rangkaian tangga RL, RC, LC, dan RLC dengan sumber tegangan dapat direpresentasikan ke dalam bentuk \textit{state equations} berupa persamaan matriks-vektor $\dot{\mathbf{x}}=\mathbf{Ax}+\mathbf{B}u$. Dengan pemilihan \textit{state variables} tertentu, \textit{state matrix} $\mathbf{A}$ yang terbentuk dalam proses pemodelan memiliki pola unik dan menarik. Pola ini dapat digunakan sebagai rujukan dalam mengkonstruksi \textit{state equations} untuk rangkaian tangga $n$ tingkat dengan sumber yang sama. Selain itu pola yang didapatkan juga memudahkan perhitungan nilai eigen \textit{state matrix} $\mathbf{A}$. Selanjutnya nilai eigen tersebut akan menentukan kestabilan dari sistem dinamis $\dot{\mathbf{x}}=\mathbf{Ax}$. Berdasarkan teori matriks dan indikasi perhitungan numeris rangkaian tangga LC menghasilkan sistem dinamis yang stabil sedangkan rangkaian tangga RL, RC, dan RLC menghasilkan sistem dinamis dengan kestabilan asimptotik.
STUDI EKSPERIMEN PENGARUH KUAT ARUS TERHADAP KEKUATAN TARIK DAN KEKERASAN HASIL LASAN LOGAM PIPA ALUMINIUM SERI 5000 (AlMg5) Ali Achmadi
SIMETRIS Vol 9 No 2 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Welding technology is one part that can not be separated in manufacturing technology. In general,welding can be interpreted as a metallurgical bond in a metal or alloy metal connection which iscarried out when the metal is liquid. Now welding is the implementation of a very important job inproduction technology with metal raw materials. In this study aims to determine how the influence ofstrong currents on mechanical properties in MIG welding. that is by changing the welding currentstrength of 70 A, 90 A and 110 A and using a reverse polarity DC welding machine. After weldingwith varying currents, tensile and hardness testing are carried out. From these stages it will be knownthe extent of the strong influence of the flow of MIG welding results. The test results show that weldingwith a strong current of 70 A has the highest average tensile strength compared to a current strengthof 90 A and 110 A that is equal to 121.25 N / mm2. Furthermore, for hardness testing, the highesthardness data is found on the welding metal with a strong current of 70 A with a value of 96.6 HRB.From the results of tensile testing and hardness testing, the current strength factor greatly influencesthe results of welds (tensile strength and hardness). Here the 70 A strong current can produce betterwelding strength than 90 A and 110 A.
Evaluasi Kerusakan Jalan Dan Penanganan Dengan Metode Bina Marga Pada Ruas Jalan Banjarejo - Ngawen Andi Rahmanto
SIMETRIS Vol 10 No 1 (2016): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Roads is an infrastructure to support an economic pace, also play a major role in the progress and development of an area.The progress of an economic development in an area can not be separated from the main function of road infrastructure. Thiscondition will make changes in the transportation of goods and services that are increasing in volume and weight load aspect, thatburden the road. Because of the changes, the road often has a very disturbing breakdown that can make people in danger. Roaddamage is one of the problems for inter- district or region connections. So there need an analysis that discuss about the damageof the road. There is a method that can be used to analyze road damage, it is called the Bina Marga method. This research aimsto evaluate the level of damage of the Banjarejo Street to Ngawen street STA 0 + 100 – 1 + 100 based on the Bina Marga method.There is six kinds of road damage that occurred, among them: holes, fillings, grains release, udders, elongated cracks, andcrocodile cracks. From those six types of road damage, available extent of damage on the Banjarejo street to Ngawen street STA0 + 100 – 1 + 100, as much as 20,24%. The type of handler that suits with that damage is put the roads in the road improvementprogram, by doing a planning of new street
Penaruh Penambahan Al-TiB Terhadap Kekerasan Produk Pengecoran Sentrifugal Velg Alumunium A 356 Ali Achmadi
SIMETRIS Vol 10 No 1 (2016): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

One of the problem in the small industry creating velg process, is in low quality product compared tomanufactures. Current result of research concludes that the quality product small industry isinfluenced by casting method used gravity casting method. To improve its quality mechanicalproperties, casting method can be designed to sentrifugal method by adding master alloy Al-TiB. Thisresearch go in certain directionto know the influence of adding Al-TiB toward the hardness on processof sentrifugal casting, and for determine how much the percentage of Al-TlB that results the mostoptimum velg. This research conducted by using experimental method, the material used that isaluminum A 356, added Al-TiB in the amount of 0%, 0,12%, 0,17%, 0,22%, and 27%. Along with thecasting is conducted in 400 Rpm rotation. The result of study proves the change in the hardnesseffected adding variation of Al-TiB.The result of observation through the research shows that there isimpronement of mechanical properties. It is the improvement of hardness from 60,42 HRB, withadding Al-TIB in the mount of 0,12%, and if it is compared between local velg product and maufacturesproduct, so as a result, there is the improvement of the hardness score from 25,17 HRB local productand the hardness score 23,67 HRB, the manufactured product becomes 60,42 HRB by adding Al-TiB0,12%.
STUDI EKSPERIMEN PENGARUH PERLAKUAN QUENCHING DENGAN VARIASI PENDINGIN KONSENTRASI AIR GARAM TERHADAP KEKERASAN DAN KEKUATAN TARIK PADA BAJA ST 37 Ali Achmadi
SIMETRIS Vol 10 No 2 (2016): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Perlakuan panas (heat treatment) merupakan kombinasi antara pemanasan dan pendinginan yangterkontrol terhadap logam/baja atau paduan dalam keadaan padat dengan durasi waktu untuk memperoleh sifatsifat tertentu. Tujuan penelitian ini untuk mengetahui pengaruh perlakuan Quenching dengan variasi pendinginkonsentrasi air garam dan untuk mengetahui variasi pendinginan konsentrasi air garam mana yang mampumenghasilkan kekerasan dan kekuatan tarik yang paling baik pada plat baja ST 37.Metode penelitian dimulai deganpembuatan spesimen dengan standart ASTM A370, lalu dilanjutkan dengan proses pemanasan spesimen dalamdapur pemanas hingga mencapai suhu 830oC dan setelah itu proses pendinginan dengan variasi larutan garam18%, 23% dan 28%. Hasil uji kekerasan menunjukan kekerasan maksimal diperoleh pada spesimen dengan variasi72% air + 28% garam yaitu sebesar 93,3 HRB. Untuk hasil dari pengujian tarik didapatkan kekuatan tarikmaksimal pada spesimen dengan variasi 82% air + 18% garam yaitu sebesar 133,14 MPa.
Penaruh Penambahan Al-TiB Terhadap Kekuatan & Keuletan Produk Pengecoran Sentrifugal Velg Alumuniun A 356 Ali Achmadi
SIMETRIS Vol 11 No 1 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Salah satu permasalahan yang ada pada industri kecil proses pebuatan velg adalah kualitas produknya masih rendahdibandingkan dengan produk pabrikan. Hasil penelitian terdahulu menyimpulkan bahwa kualitas produk industri kecildipengaruhi oleh metoda pengecoran yang digunakan yaitu metoda gravity casting. Untuk meningkatkan kualitas sifatmekanisnya, maka metoda pengecoran dapat diubah menjadi metoda sentrifugal dan dengan menambahkan master alloy AlTiB. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan Al-TiB terhadap kekuatan & keuletan pada prosespengecoran sentrifugal serta menentukan barapa prosentase Al-TiB yang dapat menghasilkan velg yang paling optimum.Penelitian ini dilaksanakan dengan mengunakan metoda ekperimental, bahan yang digunakan aluminium A 356 danditambahkan Al-TiB sebesar 0%, 0,12%, 0,17%, 0,22% dan 0,27% serta pengecoran dilakukan dengana putaran 400 rpm. Hasilpengujian terlihat perubahanterhadap kekuatan & keuletan akibat variasi penambahan Al-TiB tersebut. Hasil pengamatanterhadap penelitian ini menunjukkan bahwa telah terjadi peningkatan sifat mekanis yaitu kekuatan tarik naik dari 72 MpatanpaAl-TiB menjadi 134 Mpa dengan penambahan Al-TiB, dan EL 2,20% tanpa Al-TiB menjadi 6,68% dengan penambahan Al-TiB.

Page 6 of 15 | Total Record : 148

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