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INDONESIA
JURNAL POLI-TEKNOLOGI
Published by Politeknik Negeri Jakarta
ISSN : 14122782     EISSN : 24079103     DOI : https://doi.org/10.32722/pt.v20i1
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation
Poli-Teknologi Journal is a journal, which began publication in 2002, published by the Research and community service Unit of Politeknik Negeri Jakarta. It starts from Volume 1 Number 1 in January 2022 for printed version; ISSN (print) 1412-2782 and ISSN (online) 2407-9103. Poli-Teknologi Journal is a series of scientific publications in applied science and technology area from the perspective of a multi and interdisciplinary studies and it is published 3 times in year.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 410 Documents
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ANALISIS SAMBUNGAN BALOK PRECAST SEDERHANA DENGAN SISTIM DOUBLE LAPSPLICES MIDDLE WET JOINT DI MOMEN MAKSIMUM Andrias Rudi Hermawan; EKA SM
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.490

Abstract

ABSTRACT This research about connection of precast simple beam with double lapsplices middle wet joint system have finished with comparing of flexure strength between precast beam with connection at meddle span (middle wet joint) and conventional beam. Performance of flexure strength of precast beam with connection at meddle span (middle wet joint) is better than conventioanal beam, can be proved to curve of deflection – load between conventional beam (1 and 2) with precast beam with connection at meddle span (middle wet joint 1 and 2). Base on that curve, can be known that precast beam with connection at meddle span (middle wet joint 1) have deflection10 mm at 151,8 kn and precast beam with connection at meddle span (middle wet joint 2) have deflection16 mm at 169,2 kn and conventional beam 1 have deflection 47 mm at 145,5 kn and conventional beam 2 have deflection 40 mm at 144,7 kn Keynote : prestressed,precast,boned nonprestressed,concrete
WAKTU DENGUNG EFEKTIF UNTUK DESAIN MULTIFUNGSI AUDITORIUM PENDIDIKAN DYAH NURWIDYANINGRUM; SRI KURNIASIH
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.491

Abstract

ABSTRACT Auditorium is meeting closed space that designed for acoustical quality purposes. In education field, auditorium is needed as primary supporting education facilitation. University generally use auditorium for multifunction activities such as public lecture, art performance, research seminar and exibition. Reverberation timeis one of methodto measure acoustic quality in closed spaceespecially auditorium. For multifucntion auditorium, reverbaration time target range around 0,5 – 1 second. Existing reverberation time calculation become a reference in prequisites achievement that is targeted. Space planes surface redesign included floor, wall, plafond and interior influences prequisites achievement. Another, space planes surface redesign should improve aesthetic value and space fucntion supporting value.comparasion between existing and redesigned calculation shows that prequisites is achieved with change interior arrangement (chairs and tables), correct stage backgroud material, streamline coridor plafond shape, replace diffuser on main plafond, and repair unefective reflective wall Keywords : reverberation time, diffuser, acoustic
BETON INSTANT TANPA SEMEN DAN TANPA PEMADATAN MANUAL PRATIKTO PRATIKTO; ANNI SUSILOWATI
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.492

Abstract

ABSTRACT The so called self compacting geopolymer concrete can be a response to the weakness of conventional concrete cause the need of cement and compaction process. Global warming caused by greenhouse gas emissions , such as co2 as a result of the use of portland cement can be reduced. Instant concrete will consist of aggregates and a mixture chemical composition of geopolimer in the absence of water. The activator of geopolymer concrete used alkaline solution consisting of sodium hydroxide ( naoh ) and sodium silicate , with fly ash binder . Variation of water binder ratio ( wbr ) from 0.30 , 0.25 and 0.20 combined with superplasticizer of 1% and 2 % . Aggregate to be used is split with a diameter of 10mm and fine aggregate sand. Results are mixed composition : naoh = 1 ; na2sio3 = 2 ; water = 1.8 ; fly - ash = 7.1 ; aggregate fine = 7.3 and split aggregate = 11 , with 20 % of superplasticizer . Used as a test specimen cylinders and beams for strength testing . Testing was conducted on the workability , flowability , and segregation . Blocking value ratio , and compressive strength testing will be a concrete value for this measure . Flowability testing , used lshaped box , j - ring test and v - funnel test while testing the workability with slump flow test used slump cone . Results obtained in the form of aggregate composition and compound of geoplolimer wrapped in bags to be used as an instant concrete Keywords: alkali solution, flowability, l-shaped box, self compactinggeopolymer concrete, slump flow
STABILITAS DINAMIS BETON ASPAL CAMPURAN PANAS DIBAWAH VARIASI TEMPERATUR Eva Azhra Latifa; Nuzul Barkah Prihutomo; Mulyono Mulyono
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.493

Abstract

ABSTRACT This research is part of a long-term study in an effort to discover a kind of asphalt concrete mix that is both economical and highly durable at up to 600 celsius under flood water submersion. The research is conducted by testing the dynamic stability of hot mix asphalt concrete as to simulate vehicle wheel load on a flexible road pavement. The tested mix utilizes portland cement and stone dust as the filler aggregate, as well as soft-gradation stone ash bina marga 2010 with pertamina asphalt, asphalt concrete mix with retona asphalt, and asphalt concrete mix with superpave-gradation aggregate. All those mixes undergo the marshall stability test as well as residual stability and refusal density tests beforehand to achieve the most optimum composition. The marshall stability test is conducted with different submersion times, ranging from 24, 72 to 120 hours, at temperatures ranging from 300, 380 to 600 celsius. The dynamic stability of the mixes is tested by a wheel-tracking device at 300 and 600 celsius. The data is analyzed through the regression analysis method. After treatment, results showed that the mix of bina marga fine gradation with stone dust filler and retona asphalt 55has highest dynamic stability with lowest rate of deformation. Keyword : filler aggregate, superpave gradation, bina marga fine gradation, marshall characteristic, dynamic stability
PEMANFAATAN ABU SEKAM PADI SEBAGAI SUBSTITUSI SEBAGIAN SEMEN PADA MORTAR SEMEN PASIR MUHTAROM RIYADI
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.494

Abstract

ABSTRACT Tilization of waste from the combustion of rice husk ash bricks optimally, can solve the problem of environmental pollution. It also can save the construction costs due to reducing in the use of cement. The addition of fine grains that pass the sieve on the size of 0.075 mm can improve the workability of mortar, minimum the voids and finally waterproof ability improve strength. This studi is to determine the performance of rice husk ash on the physical and mechanical properties of mortar. Workability includes the water absorption,ability compressive strength, tensile strength, adhesion of the mortar and optimal percentage value addition of rice husk ash. The research method used in this research was a run by analising a series of samples experiments. The test piece was made with five kinds of mixtures, they were : 1 cement : 5 sand as a comparison and: 1 cement : 5 sand with rice husk ash substitution of cement by 10%, 15%, 20% and 25%, the water factor (cement + rha) between 0.92 to 1.05 and the value spread between 80% - 90% for each test specimen made 25 pieces. Every type of mixture was tested was : the spread, water absorption, compressive strength, tensile strength and bonding strength. The results showed that the addition proportionaly substitution rha composed with addition of water, and inversely composed to the density, the compressive strength, tensile strength, due to a chemical reaction of sio 2 and cao, rice ash husk only serves as a filler since the reaction was take place after 4 days old of sample. Compressive strength of mortar ranged from 10.25 mpa -13.00 mpa, including the type s mortar, for the substitution asp 0%, 10% and 15% asp, and type n for substitution asp 20% and 25% (sni-03-6882 -2002). Bonding strength of mortar was 0.09 mpa (0.9 kg/cm2) at 25% has substitution of asp, while others were not measurable because the specimen were bricks broken, before the bonding between the bricks was loose. Keywords: mortar, rice husk ash, physical and mechanical properties
PROTOTYPE POMPA APUNG SARITO SARITO; WARJIYO WARJIYO
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.495

Abstract

ABSTRACT Floating pump is a water pump than can flat and adapt to the level of water surface. This water pump is solution of the problem happens because of the significant increase an decrease of the level of water. If this 125 watt water pump installed on the ground surface it is unable to suck water because the well water depth passes the maximum height of the water pump’s ability to suck water. If the water pump installed by hanging over the well, there is possibility of being soaked when the level of water surface increased. Working principal of the floating pump is based on the archimedes law, where every object that immerses in a liquid (water) will get a force to the top which valve is as big as the liquid removed by the object. Floater loaded by air install under the pump’s plate and support the weight of the floating pump system so that the system can float. The floating pump can be used and relatively stable of the shake of the machine pump and of the increase and decrease of the water level because it follows the increase and decrease velocity of the well water level. Flexible water pipe gives flexibility to the pump system to go up and down, following the water level. Height of the suction is not very high less than 20 cm and it is always constant because the pump system floating on the water surface. If it is compared by the maximum suction, 9 meters, it doesn’t affect the suction debit. Along with the level decrease of the pump system following the degradation of the well water level when the pump operated, there is a decrease in the debit because of the height increase of pushed pipe. Key words: floating pump, floater, water.
ANALISIS KERUSAKAN STRUKTUR PERKERASAN DAN TANAH DASAR PADA RUAS JALAN SEMEN – NGLUWAR KABUPATEN MAGELANG EKO WIYONO
Jurnal Poli-Teknologi Vol. 12 No. 1 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i1.496

Abstract

ABSTRACT Evaluation of the condition of the road pavement structure required prior to maintenance and repair . This study aims to determine the type of damage , extent of damage , and determine how to repair the damage road pavement cement - ngluwar . The research includes assessing pavement conditions visually using pci method by dividing the road into 52 segments , dynamic cone penetrometer test ( dcp ) subgrade , test california bearing ratio ( cbr ) field in base layer , traffic surveys , and analysis using the additional thick layer methods of aashto , 1993 . The results showed that , the visual type of damage that occurs is alligator cracking , block cracking , depression , long and transverse cracking , patching , raveling & weatering , rutting , extensive damage to 25.30 % , the dominant type alligator cracking damage 14.23 % of the total area and obtained an average value of 50.06 pci or pavement conditions are (fair ) . Dcp test results of subgrade cbr values obtained on average 10.33 % , the results of the field test cbr cbr base layer is obtained on average 65.70 % , the survey results obtained lhr traffic as much as 2397 vehicles / day . Repair damage in accordance with the location , type , and extent of the damage , it is better if done additional coating ( overlay ) , a thick layer of additional analysis , with a design life of 10 years acquired an additional layer 5cm thick . Keywords : pavement, condition, damage, subgrade, repairs
TUNING PARAMETER PID DENGAN METODE CIANCONE PADA PLANT HEAT EXCHANGER MURIE DWIYANITI1; Kendi Moro
Jurnal Poli-Teknologi Vol. 12 No. 2 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i2.502

Abstract

ABSTRACT Tuning of pid parameters is crucial in determining the success of a controller. But it is not easy to tune, some systems use a trial and error method that takes a long time to get the appropriate parameters. The purpose of this research is to provide a simple method of how to determine the pid parameters for controlling a process plant using ciancone’s method. This method is based on changes in plant reaction if given the input and the output response of the system is used as the basis to create a mathematical model with first-order approach. Then calculate the fraction dead time and determine the value of pid parameters based on correlation graphs ciancone. The results proved that the method is successful in controlling the temperature of the heat exchanger plant with pid parameter kc = 0.9, 1/ti = 1/28.08, and td = 2.16. With these parameters, the temperature of the plant heat exchanger can achieve the set point with rise time 21.9 seconds, settling time 101 seconds, 2.27 % overshoot and steady state error 0 . Furthermore, the system successfully follows the changes in set point and when given disturbance, the system can return to a steady state within 150 seconds. Key words : tuning , pid , ciancone method , heat exchanger. ABSTRAK Tuning parameter pid merupakan hal yang sangat penting dalam menentukan kerberhasilan sebuah pengendali. Namun untuk melakukan tuning tidaklah mudah, beberapa sistem menggunakan metode trial and error yang memerlukan waktu lama untuk mendapatkan parameter yang sesuai. Tujuan penelitian ini adalah memberikan metode yang sederhana bagaimana menentukan parameter pid untuk mengendalikan sebuah proses plant berdasarkan metode ciancone. Metode ini didasarkan pada perubahan reaksi plant jika diberi input dan respon keluaran sistem tersebut dijadikan dasar untuk membuat pemodelan matematika dengan pendekatan orde satu. Lalu menghitung fraction dead time dan menentukan nilai parameter pid berdasarkan grafik ciancone correlation. Hasil yang didapat terbukti bahwa metode ini berhasil mengendalikan suhu pada plant heat exchanger dengan parameter pid kc = 0.9, 1/ti = 1/28.08, dan td = 2.16. Dengan parameter tersebut, suhu pada plant heat exchanger dapat mencapai set point dengan rise time 21.9 detik, settling time 101 detik, overshoot 2.27% dan error steady state 0. Sistem juga berhasil mengikuti perubahan set point dan ketika terjadi gangguan, sistem dapat kembali ke keadaan steady state dalam waktu 150 detik. Kata kunci : tuning, pid, metode ciancone, heat exchange
ANALISIS DAN PERANCANGAN SISTEM PERINGATAN DINI KEHADIRAN MAHASISWA BERBASIS SHORT MESSAGE SERVICE (SMS) CECEP SULAEMAN1; HARY BUDIARTO2
Jurnal Poli-Teknologi Vol. 12 No. 2 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i2.503

Abstract

ABSTRAK Sistem peringatan dini merupakan sebuah perencanaan sistem atau prosedur untuk memperingatkan terhadap potensi atau menjelang terjadinya permasalahan. Oleh karena itu mahasiswa diberikan peringatan supaya ketidakhadiran tidak terus bertambah. Jika jumlah ketidakhadiran sudah mencapai batas surat peringatan data ini akan diberitahukan melalui sms ke mahasiswa, orang tua mahasiswa dan pembimbing akademik dan selanjutnya didiskusikan untuk mencari solusinya. Dengan demikian jumlah ketidakhadiran akan terkontrol dan kendalanya akan diperbaiki. Sistem peringatan dini kehadiran mahasiswa berbasis short message service (sms) digunakan untuk memberikan peringatan bahwa ketidakhadiran mahasiswa telah mencapai batas surat peringatan i, ii dan iii sesuai peraturan pendidikan politeknik negeri jakarta. Perancangan sistem peringatan dini kehadiran mahasiswa berbasis short message service (sms), dilanjutkan dengan memodelkan berbasis uml alur proses untukmelakukan identifikasi kebutuhan dalam proses melakukan perancangan menggunakan suatu kerangka kerja zachman. Hasil analisis dan perancangan sistem peringatan dini kehadiran mahasiswa berbasis short message service (sms), ini mempunyai menu utama berupa menu admin berupa data ketidakhadiran mahasiswa, jadwal kuliah, absen, jumlah ketidakhadiran, sms. Menu utama yang lain sekretaris program studi berupa pengisian data mahasiswa, pengelolaan data, tambah data mahasiswa, jumlah ketidakhadiran dan sms. Output yang dihasilkan berupa jumlah ketidakhadiran yang didalamnya dikelompokkan ke surat peringatan i, ii dan iii. Rekap surat peringatan ini selanjutnya dikirim ke mahasiswa, orang tua mahasiswa, pembimbing akademik melalui sms. Kata kunci :peringatan dini,kehadiran, sms.
APLIKASI INSTRUMENTASI ULTRASONIK PADA PENGUJIAN SIFAT MEKANIK LOGAM AGUS SUKANDI1; BUDI SANTOSO2
Jurnal Poli-Teknologi Vol. 12 No. 2 (2013)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v12i2.504

Abstract

ABSTRACT Ultrasonic wave can flow through solid, liquid and fluid (gas) medium. To findmechanic properties (poisson ratio, young modulus, and shear modulus) are needed to know relation equation mathematic between stress, strain and characteristics ultrasonic wave at metal (solid medium). Ultrasonic instrumentation test is non destructive test, because metal test is needed not using stress or compression great force. Testing process are recorded tracingtime and computed velocity ultrasonic wave at metal test.result of measurement data as input to used for calculate poisson ratio, young modulus, and shear modulus. Result of research at nickel metal are poisson ratio 0.305 , young modulus E 200 GPa. , and shear modulus G 78 GPa. Keyword : ultrasonic, poisson ratio, modulus elasticity, non destructive test. ABSTRAK Gelombang ultrasonik dapatmerambat pada medium padat, cair dan gas (udara).Dengan mengetahui hubungan matematik antara perubahan tegangan dan regangan pada logam (mediumpadat) dengan karakteristik gelombang ultrasonik maka logam tersebut dapat diketahui sifat-sifat mekaniknya (seperti modulus Young, modulus geser, dan poisson ratio).Pengujian denganinstrumentasi ultrasonik merupakan pengujian tanpa merusak, karena bahan uji tidak perlu ditarik atau ditekan dengan gaya yangbesar, tetapi cukup diketahui dimensi dan massanya.Proses pengujian dilakukan dengan mencatat waktu tempuh dan perhitungan kecepatan rambat gelombang pada logam tersebut. Data hasil pengukuran kemudian dimasukkanke dalam persamaan matematika untuk menghitung poisson ratio, modulus elastisitas, dan modulus geser.Hasil penelitian pada bahan uji logam Nikel diperoleh nilai poisson ratio 0.305 , modulus Young E 200 GPa. , dan modulus geser G 78 GPa. Kata kunci : Ultrasonik, poisson ratio, modulus elastisitas, pengujian tanpa merusak.

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