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Contact Name
Dharu
Contact Email
dharufs@staff.uns.ac.id
Phone
+6281217717892
Journal Mail Official
mesin@ft.uns.ac.id
Editorial Address
Jl. Ir. Sutami no 36 A, Building I, Faculty of Engineering, Universitas Sebelas Maret, Surakarta
Location
Kota surakarta,
Jawa tengah
INDONESIA
Mekanika: Majalah Ilmiah Mekanika
ISSN : 14127962     EISSN : 25793144     DOI : https://doi.org/10.20961/mekanika
Core Subject :
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Articles 83 Documents
The Effect of Cutting Fluids and Cutting Speeds to The Vibrations of Milling CNC Machine A Muhammad Fuad Nur Rochim; Indri Yaningsih; Heru Sukanto
Mekanika: Majalah Ilmiah Mekanika Vol 16, No 2 (2017): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v16i2.35054

Abstract

Vibration that occur in machining process is forced vibration. This vibration caused by external force excitation. External force that cause vibration in machining process is cutting force. This research was aims to determine the effect of cutting fluids and cutting speeds to vibration in milling process. The specimens were made using a cutting process type face milling, profile milling, pocket milling, and slot milling. Cutting speeds was variated at 62.83 m/min; 110 m/min; 157.14 m/min; 188.5 m/min. Vibration testing was done using the accelerometer sensor. Vibration response taken is the amplitude. The results show any type of cutting process has a different amplitude. Face milling has the smallest amplitude while slot milling has the biggest one. At cutting speeds parameter, the faster of cutting speeds the smaller of the amplitude. The use of cutting fluids can reduce the friction value between cutting tool and workpiece so that the cutting force will decrease. The use of cutting fluids causing the smaller the cutting force. The increase of the cutting force will cause greater vibration
The Utilizing Cutting Fluid And Feeding Rate Effect To The Surface Hardness And Precission Of Aluminum Material Using Cnc Milling Machine Widhaya Bastian Purnama; Indri Yaningsih; Heru Sukanto
Mekanika: Majalah Ilmiah Mekanika Vol 16, No 1 (2017): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v16i1.35049

Abstract

There are many factor affecting the quality of product that are produced from milling machine process. The quality is mostly about surface roughness and precision. Those affecting factors are the selection of cutting parameter and use of cutting fluid. The research is done in order to know the effect of using cutting fluid and feed rate to aluminum on surface roughness and precision using Milling CNC machine. This research uses milling CNC Mitsubishi M70 machine. The free variables of feed rate are 20, 32, 45, 69, 108 mm/min. Each feed rate variations are given cutting fluid and no- cutting fluid treatment. The cutting fluid used is bromus oil which is mixed with water. The tests performed were surface roughness test, precision test. The result of this study shows that feed rate is in line with surface roughness. The use of cutting fluid affects surface roughness. The surface roughness score at feed rate variation using coolant treatment are 20, 32, 45, 69, 108 mm/min shows the surface roughness score of 0,442; 0,484; 0,553; 0,643; 0,797 μm. surface roughness score without cutting fluid treatment reveals the score of 0,470; 0,517; 0,582; 0;662; 0,847 μm. According to statistical analysis result using two way ANOVA, it can be concluded that the use of cutting fluid and feed rate affect precision at 95% trust rate. The measurement of A dimension using cutting fluid in the variation of feed rate 20, 32, 45, 69, 108 mm/min shows the precision rate of 99,999348; 99,99929; 99,999304; 99,999261; 99,9992 %. While, the variation without cutting fluid treatment reveals the precision rate at 99,999188 ; 99,999184; 99,999037; 99;998884; 99,998684 %.
STUDI EKSPERIMENTAL PENGARUH VARIASI SUDUT BLADE ARC TERHADAP PERFORMA SAVONIUS HORIZONTAL AXIS WATER TURBINE TIPE L PADA ALIRAN DALAM PIPA Muhammad Ilham Nadhief; Syamsul Hadi; Dominicus Danardono Prija Tjahjana
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35402

Abstract

Air merupakan energi baru dan terbarukan pengganti energi fosil yang dapat digunakan untuk memenuhi kebutuhan listrik masa depan karena jumlahnya yang melimpah. Turbin air savonius horizontal axis water turbine (HAWT) mampu beroperasi pada kecepatan putar rendah sehinga cocok untuk pembangkit listrik tenaga air menggunakan metode rain water harvesting (RWH). Namun, turbin ini memiliki koefisien daya dan torsi yang rendah. Penelitian prototipe rotor turbin tipe U dengan variasi jumlah sudu, sudut kelengkungan telah dilakukan sebelumnya untuk meningkatkan kinerja turbin ini. Dalam makalah ini, dibahas proses perancangan dan pengujian terhadap sebuah prototipe rotor turbin tipe L dengan 3 variasi sudut blade arc. Variasi sudut blade arc yang diuji adalah 120o, 135o dan 150o. Melalui penelitian ini, diketahui tipe turbin yang optimal jika dianalisa dari power output, TSR, dan power coefficient yang dihasilkan oleh turbin. Turbin tipe L dengan sudut blade arc 135o memiliki power coefficient paling tinggi sebesar 27% dengan TSR sebesar 1,320 dibandingkan turbin dengan sudut blade arc 120o dan 150o.
Pengaruh Solution Heat Treatment terhadap Sifat Fisis dan Mekanik Proses Pengelasan Fssw AA6063-T5 Ciptadi Natawiguna; Nurul Muhayat; Teguh Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 17, No 1 (2018): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v17i1.35044

Abstract

Friction stir spot welding (FSSW) of aluminum alloy AA6063-T5 will decrease the strength and hardness. Physical and mechanical properties of aluminum alloy can be improved by heat treatment. Heat treatment is affected by temperature and holding time. The heat treatment process used for this research was solution heat treatment with temperature variation 470, 500, 530 oC and holding time 1 and 2 hours. The tests included microstructure test, tensile shear test and vickers hardness test. Result of the research, it was found that Mg2Si particles were precipitated from the grain boundaries part into the aluminum matrix with the coarser size and the distance was increasing as the temperature and the holding time increases. The highest shear tensile strength of 3735,2 N was obtained from the temperature variation of 470 oC and the holding time of 1 hour. The lowest tensile shear strength of 3172,6 N was obtained from temperature variation of 530 oC and 2 hours of holding time. The highest hardness value was obtained of 470 oC variation and 1 hour was 43,7 HVN and the lowest hardness value at 530 oC variation and 2 hours of holding time was 30,1 HVN.
Karakterisasi biokomposit sheep hydroxyapatite (sha)/shellac/tepung terigu Izmi Mahfudi; Joko Triyono; Teguh Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 17, No 2 (2018): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v17i2.35125

Abstract

The development of science and technology has led to new inovations in the medical field, especially ortopedic. The aim of those inovations is to find the alternatives of good materials that can replace the broken sturcture of bone tissue. One of the innovations conducted is the characterization of sheep hydroxyapatite biocomposite. This study aims to investigate the mechanical properties of the material Sheep Hydroxyapatite (SHA) / shellac / wheat fluor. Sheep bone powder already gained from the crusher process and meshing into size of 100 and are soaked for 24 hours, then mixed with wheat flour with the ratio 30 : 70 %wt, 40 : 60 %wt, 50 : 50 %wt, 60 : 40 %wt, 70 : 30 %wt. The next step is the forming process and calcination at a temperature of 900oC with a increase of 10 °C/min. Results of X-Ray Diffraction (XRD) shows that the diffraction peak of SHA/shellac/wheat flour is the value of 2θ: 32.0747º, 33.1943º, 32.5338º. The lowest hardness number of SHA/shellac/wheat flour is 2.86 VHN and the highest is 14.80 VHN, also the highest strong pressure number is 0.20 MPa. The result of microscophy at observation using SEM shows Thar the SHA/shellac/wheat flour 50:50 % wt sample has more porosity as.
EFFECT OF ROTATIONAL SPEED AND DWELL TIME ON PHYSICAL AND MECHANICAL PROPERTIES OF FRICTION STIR SPOT WELDING ALUMINIUM 1100 WITH ZN POWDER INTERLAYER ADDITION Aditya Noor; Nurul Muhayat; . Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 1 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i1.35039

Abstract

Friction stir spot welding (FSSW) is one of the development of solid state welding to joint lightweight materials such as aluminium. In the automotive industry, lightweight materials are needed in the structure of vehicle construction to improve efficiency in vehicles. This research aims to find out how the effect of rotational speed and dwell time on physical and mechanical properties on the weld joint of aluminium 1100 with Zn interlayer addition. Variations used in rotational speed 1000, 1250, 1600 rpm and dwell time 6, 7, 8 s. Pullout fracture occur in tensile tests that are getting bigger with increasing rotational speed and dwell time. The results of SEM and EDS observations showed that the metallurgical bonded zone increased and kept the hook defect away. The spread of Zn in the stir zone area causes the formation of solid Al-Zn phase in a solid solution. The hook defect filled with Zn can minimize cracks that occur, so increased the tensile shear load. The highest tensile shear load value of FSSW AA1100 without Zn interlayer is 3.61 kN, while the FSSW AA1100 with Zn interlayer addition is 4.34 kN.
Experimental Studies of Twist Ratio Effect to The Heat Transfer Enhancement Using Square Cut Tape and Classical Tape Insert Alfan Adha Hutama Putra; Agung Tri Wijayanta; Indri Yaningsih
Mekanika: Majalah Ilmiah Mekanika Vol 16, No 2 (2017): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v16i2.35055

Abstract

EXPERIMENTAL STUDIES OF TWIST RATIO EFFECT TO THE HEAT TRANSFER ENHANCEMENT USING SQUARE CUT TAPE AND CLASSICAL TAPE INSERT
Bovine Bone Hidroksiapatite Materials Mechanics Properties at 900°C and 1200°C of Calcination Temperature Antonius Adi Hendra Saputra; Joko Triyono; Teguh Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 16, No 1 (2017): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v16i1.35050

Abstract

The aims of this study is to determine the mechanical characteristics of the calcinated scaffold material bovine hydroxyapatite (BHA) for bone filler applications. Scaffold BHA was obtained from femur section of bovine bones which cut into 10x10x10 mm. Scaffold BHA was calcinated by temperature variations of 900ºC and 1200°C for 2 hours with 10ºC/min as the amount of the increasing level. The study result of each scaffold BHA which had been calcinated by 900°C and 1200°C has a hardness value of 8.48 ± 0.1118 VHN and 12.37 ± 0.5803, meanwhile the compressive strength value of each scaffold BHA samples is 3.03 ± 0.6764 MPa and 1.96 ± 0.3450 MPa. The porous on scaffold BHA samples calcinated by 900°C and 1200°C which had been observed by SEM had porous size that is not much different, it was ± 200-400 μm, the difference can be seen from the smaller porous size of the scaffold BHA calcination 1200°C compared to the porous size of scaffold BHA calcination 900°C.
DIAGNOSIS KETIDAKLURUSAN (MISALIGNMENT) POROS MENGGUNAKAN METODE MULTICLASS SUPPORT VECTOR MACHINE (SVM) Wanto Wanto; R. Lulus. G. H.; Didik Djoko Susilo
Mekanika: Majalah Ilmiah Mekanika Vol 18, No 2 (2019): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v18i2.35403

Abstract

Misalignment is a condition where the centerlines of two coupled shafts do not coincide. Misalignment is the commonly fault in rotating machinery. Detection and diagnosis of shaft misalignment is crucial to achieve its optimal performance. The purpose of research is to diagnose shaft misalignment using multiclass support vector machine (SVM). The time-domain vibration signals of a shaft alignment rig with normal, parallel misalignment and angular misalignment of shaft conditions were obtained from vibration measurement signals. The accelerometer was used to measure vibration with a sampling frequency of 20 kHz at the constant speed operation of 1000 rpm. The features of median, RMS, crest factor, variance, kurtosis, shape factor, impulse factor, skewness, range, standard deviation and maximum were extracted from the vibration signal. The Principal Component Analysis (PCA) was applied for reduce the number of variables for data input to principal components with lower dimension. The multiclass SVM with One Against One (OAO) methodand linear kernel were used for classification. The results show that SVM for diagnosis of shaft misalignment show a good performance with an accuracy of 100%.
Perencanaan Sistem Elektrikal pada Apartemen Menara One Surakarta Ulil Albab AlFaruq; Budi Santoso; Chico Hermanu B Apribowo
Mekanika: Majalah Ilmiah Mekanika Vol 17, No 1 (2018): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v17i1.35045

Abstract

This paper presents the design of electrical system in Menara One apartment. Electrical system calculation based on PUIL 2000 method. The conductor uses 1.25 times the nominal current as a safety factor. The calculation of voltage drop based on total load, length, and area of conductor. Total load is calculated from apartment room and apartment utility load. Total load results are used to determine generator capacity and transformer. The load capacities apartment rooms are 2.2 kVA for type 1 and 3.5 kVA for type 2-6. The total of utility load is 215.8 k VA. The maximum installed room for the apartment is 982.31 kVA with voltage drop from the farthest panel to the LVMDP is 1.89%.