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TEKNIK

teknik
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Published by Universitas Diponegoro

ISSN : 08521697 EISSN : 24609919 DOI : -

Core Subject : Engineering,

Engineering

Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.

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Articles 522 Documents

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KAJIAN REPARASI PENGECATAN PADA LAMBUNG KAPAL (STUDI KASUS KM. KIRANA 3) Ariany, Zulfaidah
TEKNIK Vol 35, No 1 (2014): (July 2014)
Publisher : Diponegoro University

[Title: Study on Painting Repair of Hull Ship (Case Study of KM. Kirana 3)] Regular and scheduled maintenance are important things to make sure any ships could work and sail properly. So the main purpose to carry peoples or deliver the goods can be run smoothly. Painting is one of that items. It can protect the body or their parts from rust attack, in common word, corrosion. Estimating the paints consumption upon maintenances are very useful for ship owners, project owners neither shipyards. Upon ship KM. Kiranaâ€™s hull reparation, an analysis process can calculate the estimation of her paints consumption: For hull paint reparation of KM Kirana 3, it needed estimated 8 cane (20 liter) for bottom painting, 13 canes for bottom top, 42 canes for topside and 6 canes for weather and upper deck.

PERSEPSI MASYARAKAT TERHADAP KEBERADAAN SIGNAGE (Studi Kasus Jalan Tjilik Riwut di Kota Palangka Raya, Kalimantan Tengah) Nopemberi, Andri; Suprapti, Atiek; Murtomo, Bambang Adji
TEKNIK Vol 36, No 1 (2015): (Juli 2015)
Publisher : Diponegoro University

Keberadaan signage disatu sisi tidak terlepas dari peran masyarakat sebagai objek konsumsi, selain itu juga seringkali penempatan signage tersebut merambah kawasan ruang publik perkotaan (public space). Dalam perkembangannya, Kota Palangka Raya sudah menggunakan signage di samping menciptakan karakter tertentu pada lingkungan, pemasangan signage juga memberikan masalah tersendiri. Konflik juga terjadi karena adanya perbedaan kepentingan antara public environmental information dan private sign. Tujuan dari penelitian ini adalah untuk mengetahui bagaimana persepsi masyarakat dari publik maupun penyedia jasa reklame serta mengetahui peran pemerintah dalam pengaturan signage. Untuk menganalisis persepsi masyarakat metode yang digunakan menggunakan metode kuantitatif rasionalistik. Metode tersebut dilakukan melalui kegiatan wawancara yang mendalam (In depth interview). Hasil Analisis menunjukan bahwa terdapat pengaruh keberadaan signage terhadap persepsi masyarkat pada koridor Jalan Tjilik Riwut. Hasil dari analisa peta mental diketahui bahwa keberadaan signage pada Jalan Tjilik Riwut ini timbul akibat persaingan antar penyedia barang dan jasa tanpa lagi memperhatikan keindahan dan keefektifan dari signage tersebut, serta tidak adanya peraturan pemerintah dalam menata jenis signage dan pemerintah Kota Palangka Raya tidak mempunyai master plan/grand design. Maka pemasangan signage belum memenuhi kriteria keindahan dan keefektifan Kota Palangka Raya sehingga mengakibatkan kekaburan informasi yang disampaikan serta signage di Jalan Tjilik Riwut.[Public Perception of the Existence of Signage (Case Study: Tjilik Riwut Road in Palangkaraya, Central Kalimantan)] The presence of signage is inseparable from the role of the society of consumers. The placement of signage often penetrates urban public areas (public spaces). During its development, Palangkaraya has been using signage that creates a particular character on the environment. However, the installation of signage also creates its own problems caused by a conflict of interest between the public environmental information signs and the private signs.This study aimed to find out the perception of the public, the advertising service providers and the governmentâ€™s role in regulating signage. To analyze the perception, the method used was quantitative rationalistic. Post positivistic rationalistic approach emerged as a combination of positivism and rationalism philosophies. The method was carried out by in-depth interviews. The analysis results showed that there was significant effect of the presence of signage at the corridor of Tjilik Riwut road on publicâ€™s perception. The result of the mental map analysis was that the presence of signage on the Tjilik Riwut road emerged from competitions among providers of goods and services that neglect the fineness and effectiveness of the signage. Problems are also caused by the absence of governmentâ€™s regulation in managing the types of signage and the absence of a master plan or grand design of the City of Palangkaraya. The installation of signage in Palangkaraya does not meet the criterion of fineness and effectiveness, resulting obscurity on the intended information of the signage on the Tjilik Riwut road.Â

STUDI PENGARUH AERASI DAN RESIRKULASI LINDI TERHADAP LAJU PROSES DEGRADASI SAMPAH PADA BIOREACTOR LANDFILL Syafrudin, Syafrudin; Pujianto, Bambang; Eko Wahyuni, Sri; Eni Sunarni, Dian; Monalisa, Monalisa
TEKNIK Volume 32, Nomor 1, Tahun 2011
Publisher : Diponegoro University

On the conventional landfill, the waste degradation requires a lot of time to make it through and it produces amethane gasfrom a anaerobic which could be dangerous if there is not an optimal processing. On this research,the writer uses 7 experimental reactors, 6 reactors given aeration treatments and leachate recirculation. Thevariations which have done in the research is leachate recirculation debit, namely (10 and 15) ml/minutes andcontinual lacheateâ€™s flowing system and aeration variation, namely (3, 2, and 1)ml/minutes everyday. Theparameter which is measured is the reduction of waste volume, temperature, PH, BOD and COD for weeklyanalysis. The results of the analysis are that the aeration of 1 ml/minutes with leachate resirculation of 15ml/minutes is the best of aeration condition and it can increase the settlement process and reduction of BOD andCOD concentration in a short time of leachate. This reactor can increase the volume reduction as much as 14,14% in six week and it is bigger than control reactor. The concentration reduction of BOD is from 718, 24 mg/lbecomes 88,44 mg/l and the reduction of COD is from 1285,58 mg/l becomes 893,44 mg/l

PERANCANGAN AWAL INSTALASI AIR BUANGAN PENDINGIN MENGGUNAKAN MULTISTAGEFLASH RECYLE DISTILLATION (STUDI KASUS PT. INDONESIA POWER PELABUHAN TANJUNG EMAS SEMARANG) Hardyanti, Nurandani; Syafrudin, Syafrudin; Inri Natalia, Inri Natalia
TEKNIK Volume 28, Nomor 1, Tahun 2007
Publisher : Diponegoro University

The port of Tanjung Emas Semarang was located at the coast needed more clean water for shipping,industries and the communities. The production process of PLTU Indonesia Power produced waste wateras cooling water that caused thermal pollution. Considering the quality, quantity, and continuity of thatwaste water used as one of alternative source of clean water. It treated using by multistageflash recycleddistillation method. The purpose of this plant to fulfill clean water for shipping and port of Tanjung Emasarea with production capacity was 50 liters per seconds for duration planning about 15 years. The locationof this plant was next to PT. SRIBOGA with area 8000 m2, wherein the intake on the Canal of PLTUIndonesia Power. In order to fulfill the quality of water, this plant used oil separator and antiscalant aspretreatment. Production cost of distillation plant was Rp 13.647 per m3. This cost was too expensive so itrequired to be done crossed subsidy. The price of clean water was Rp 2000 /m3 for public, Rp 5500 per m3for industries and Rp 3000 per m3 for governmental office.

Keakuratan Prediksi Inflow Waduk Dengan Neraca Air Waduk Wulandari, Dyah Ari; Budieny, Hary; Kurniani, Dwi
TEKNIK Vol 37, No 2 (2016): (Desember 2016)
Publisher : Diponegoro University

Dalam perhitungan inflow waduk sering digunakan persamaan neraca air waduk yang menggunakan data seri laporan harian operasi waduk, evaporasi dan curah hujan diwaduk, dan lengkung H-V-A waduk. Pada pengamatan data series laporan harian operasi waduk dan pengukuran kapasitas tampungan waduk, dapat terjadi kesalahan yang disebabkan karena kesalahan faktor manusia maupun faktor alat, hal ini akan menyebabkan kesalahan pula pada besarnya inflow waduk yang dihasilkan. Lebih lanjut di dalam perencanaan, data series inflow waduk ini diperlukan sebagai input pada pemodelan optimasi operasi waduk dan sedimentasi waduk, sehingga keakuratan datanya sangat diperlukan. Tujuan penelitian ini adalah untuk mengevaluasi tingkat akurasi penggunaan neraca air waduk dalam memprediksi inflow waduk. Untuk mengetahui tingkat akurasi dilakukan dengan membandingkan antara inflow waduk dari anak sungai hasil pengukuran dan hasil hitungan dengan persamaan neraca air waduk. Kemudian dilakukan variasi periode pengukuran dan kurva H- V-A yang digunakan. Berdasarkan penelitian yang dilakukan maka pada periode perhitungan yang lebih lama menghasilkan tingkat error yang lebih kecil. Pemakaian kurva waduk yang berbeda menghasilkan inflow yang berbeda. Tingkat error yang didapat masih cukup besar, diatas 30 %, sehingga perhitungan inflow waduk dari anak sungai dengan menggunakan metode neraca air waduk kurang akurat.Â [Title: Accuracy of Reservoir Inflow Prediction Using Reservoir Water Balance] In the calculation of reservoir inflow often used reservoir water balance equation using the data series of daily reports reservoir operation, evaporation and precipitation, and H-V-A curve. In observation of the data series of daily reports of reservoir operation and measurement of reservoir storage capacity, the errors may occur due to human error factor and factor appliance. This will cause an error on the reservoir inflow generated. Further, in the planning, this series data of reservoir inflow is required as input to the modeling of reservoir operation optimization and reservoir sedimentation, so the accuracy of the data are required. The purpose of this study was to evaluate the use of the reservoir water balance accuracy rate in predicting inflow. To determine the level of accuracy, the effort is done by comparing the inflow tributary reservoirs of measurement and the count with the reservoir water balance. Then perform variations of the measurement period and curves H-V-A is used. Based on the research conducted in the period longer calculation produces a smaller error. The different H-V-A curve results in the different inflow. Error rate obtained is still quite large, above 30%, so the calculation of tributary inflow reservoirs using reservoir water balance method is less accurate.Â Â

APLIKASI PENENTUAN PARAMETER TRANSFORMASI LOKAL BATU HIJAU UNTUK SURVEI DAN PEMETAAN AREA TAMBANG PT. NEWMONT NUSA TENGGARA Darmo Yuwono, Bambang; Marzuki, Amin
TEKNIK Volume 31, Nomor 1, Tahun 2010
Publisher : Diponegoro University

Most of mining technical activities, especially survey and mapping use local reference system, including inmining area Batu Hijau of PT Newmont Nusa Tenggara. While the data obtained by using GPS measurement,it should be transform from global coordinate system to local coordinatesystem.The process needstransformation parameters to do coordinate transformation. The object of this research is to build anapplication in determining transformation parameters from global system to local system and analyzeparameters of Batu Hijau of PT Newmont Nusa Tenggara. These transformation parameters are then expectedto be used for determining coordinate in local reference. The result can be obtained the most appropriate localparameters of Batu Hijau for surveying and mapping with geometric transformation accuracy.For this reaserch Melodensky Badekas 3D relatively better than Bursa Wolf 3D appropriate geometricaccuracy are SD 0.0919 m; RMSE 0.0322 m for the Melodensky Badekas and SD 0.2506 m; RMSE 0.0322 mfor the Bursa Wolf. Affine 2D relatively better than Helmert 2D are SD 0.3082 m; RMSE 0.0931 m for Affine2D and SD 0.3531 m; RMSE 0.1070 m for the Helmert 2D.

PERANAN BALING BALING PADA GERAKAN KAPAL Budi, Utomo
TEKNIK Volume 33, Nomor 2, Tahun 2012
Publisher : Diponegoro University

Propellers is part movement propulsion system of the ships wich duty for pushing of the ship at forwardmovement and towing the body of ship at backward movement. As a part mechanical drive propeller consist ofsome blade attached to the boss and mounted on the propeller shaft of the axis relationships from the mainengine of the ships. Propeller can drive of the ships both forward and backward with by rotating on its axis. Toproduce forward and backward movement of the ships can be done in two ways namely with use controllablepitch propellers and with use fixed pitch propellers.

Minimisasi Hambatan Dan Gerak Vertikal Kapal Multihull Catamaran Dengan Centerbulbs Rahmat Prio Aprijal; Samuel Samuel; Muhammad Iqbal
TEKNIK Vol 39, No 1 (2018): (July 2018)
Publisher : Diponegoro University

ABSTRAKKapal multihull, terutama catamaran adalah kapal yang menarik untuk dikaji. Dalam segi stabilitas catamaran memiliki stabilitas kapal yang lebih baik, tetapi permasalahan yang sering timbul terkait masalah hambatan. Hambatan catamaran lebih kompleks dibandingkan dengan kapal monohull. Permasalahan yang timbul akibat efek interaksi komponen hambatan dan gelombang pada lambung kapal multihull. Dari permasalahan tersebut munculah eksperimen untuk melakukan penambahan centerbulb pada kapal catamaran. Centerbulb berguna untuk mengurangi hambatan yang terjadi pada lambung kapal yang disebabkan interaksi komponen hambatan dan gelombang. Analisa perhitungan hambatan total kapal Catamaran dihitung menggunakan software berbasis CFD yaitu ANSYS v 14.0 dan menggunakan variasi kecepatan pada Fn=0.28, Fn=0.47, Fn=0.65 serta variasi jarak antar lambung pada S/L=0.2, S/L=0.3, dan S/L=0.4. hasil dari penelitian ini didapatkan bahwa, kapal catamaran dengan S/L 0.2 dan penambahan centerbulb adalah kapal yang paling efektif karena dapat mengurangi hambatan sebesar 8-14%, dan kapal tersebut memiliki respon gerakan vertical motion yang memenuhi kriteria dan paling minimum pada kecepatan Fn 0.28.Kata kunci : Catamaran, Centerbulb, Hambatan, Vertical Motion

PENERAPAN KEBIJAKAN PENJADWALAN ULANG PADA RUANG LINGKUP SINGLE MACHINE UNTUK MEMINIMASI TOTAL TARDINESS (Studi Kasus di PT. Indonesia Steel Tube Works) Nurkertamanda, Denny; Fanani, Zaenal; Kusuma Wardhani, Anna
TEKNIK Volume 30, Nomor 2, Tahun 2009
Publisher : Diponegoro University

Customer satisfaction is the most important thing to be considered to keep the customer trust of a productor even of a company. Giving the satisfaction to the customer can be achieved by several ways and on timedelivery product is one of them. It is true that some problems can often occur during that achievement andmay hinder the on time delivery fulfillment. One of the major elements that hold the key role of on timedelivery fulfillment is production scheduling. The implementation of appropriate production schedulingpolicy will determine the accomplishment of on time delivery fulfillment in some ways. This statement isalso works for Indonesia Steel Tube Works Ltd., as a company that always cares about the customersatisfaction on quality and on time delivery. If we observe the production scheduling records of IndonesiaSteel Tube Works Ltd. we can find some lateness problems that in some case happened in an extensiveinterval of tardiness. The company only runs the production scheduling based on the group of pipediameter. This policy seems cannot well handle the rush orders that often emerge on every schedulingperiod and effect in tardiness problems. The company needs to consider the rescheduling policy with theaim of reducing the tardiness that often emerges because of the rush order disruption.

PENGARUH PERUBAHAN FUNGSI RUANG TERBUKA PUBLIK DI KOTA LAMA SEMARANG TERHADAP CITRA KAWASAN Rizka, Fadzilla; Murtini, Titien Woro; Suprapti, Atik
TEKNIK Volume 34, Nomor 3, Tahun 2013
Publisher : Diponegoro University

Old City in Semarang as cultural reservation by Semarang undergone several changes over the times. One of that is change the function of public open space, every space change in an area affects on the image of the Old City in Semarang as the historical area. In the end, the change of public open space function affects on the image of The area of Old City in Semarang as Historical Area which existence is reserved. The purpose of this research is to acknowledge effects caused by the change of public open space function according to era development on the image of The area of Old City in Semarang as historical area fulfilled with buildings which have colonial architecture style. However, there are two kinds of variables in this research which are based on discussed research substance, they are independent variable which includes public open space function (ecology function, architectural/esthetical function, social function) and dependent variable which includes area image ( area identity, area structure, meaning of area). Both variables are analyzed using rationalistic quantitative method which techniques are multiple analysis technique and descriptive analysis. After doing analysis process, the results are: Taman Srigunting and Polder Tawang are successful to conduct each function, but generally, respondents say that Taman Srigunting is much better in doing its function as public open space than Polder Tawang. As for BTPN buiding, public agrees that the building disturbs the image of The area of Old City in Semarang because the design of the building does not adjust the neighborhood and the buildings surrounding it, and also, the condition of the empty building which is not taken care of and used gives more negative effect on the image of The area of Old City in Semarang. Conclusion drawn from this research is the existence of Taman Srigunting and Polder Tawang which have three functions as public open space such as ecology, esthetical, and social function, and the existence of BTPN building affect on the image of The area of Old City in Semarang. Key words :Â function, open spaces, image

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