POLITEKNOSAINS | JURNAL ILMIAH LINTAS TEKNOLOGI

PREDIKSI KEKASARAN PERMUKAAN BAJA ST 40 BERBASIS MODEL ANALISIS REGRESI GANDA PADA PERMESINAN CNC FRAIS

Submitted by admin on

PREDIKSI KEKASARAN PERMUKAAN BAJA ST 40 BERBASIS MODEL ANALISIS REGRESI GANDA PADA PERMESINAN CNC FRAIS -

Herman Saputro, Sunaryo

The advancement in automation and accuracy of machine tool made it possible to produce high quality industrial products. One of the main perceptions of quality in mechanical products is its physical appearance. One of the most important factors in physical appearance is the surface roughness. Number of research publications addressed this issue of surface roughness measurement and analyses. This research focuses on study and analyses of surface quality improvement in milling operation of low carbon steel (St 40). These metals are selected as they are most widely used in education as well as in industry. This research paper develops an empirical model for surface roughness (Ra) prediction in milling  using St 40. The impact of cutting speed, feed, depth of cut, and dry cutting condition are studied on surface roughness.
The result produced using Regression Analyses (RA) give a good prediction of surface roughness when compare with actual surface roughness. The equation to prediction of surface roughness in dry condition is Y = 3.0581 - 0.00007 n - 9.4333 Vf  - 0.4956 a. By using Multiple Regression Method equation, the average percentage deviation of the testing set was 5.955% for training data set.
 

ANALISIS KARAKTERISTIK MOTOR INDUKSI 3 FASE NEMA D UNTUK MELAKUKAN PENGHEMATAN ENERGI

Submitted by admin on

ANALISIS KARAKTERISTIK MOTOR INDUKSI 3 FASE NEMA D UNTUK MELAKUKAN PENGHEMATAN ENERGI -

Yaya Finayani, Muhammad Alhan

Standard induction motor according to torque characteristics by NEMA (National Electrical Manufactures Association) is divided into 5 classes / design that is A, B, C, D or F. This research used induction motor NEMA D as an object under study. NEMA D Design is a high-slip motor is designed to have a high starting torque and low starting current. This study makes the simulation model of the characteristics of three phase induction motor using Math lab 7:04 and conducted an analysis of the characteristics of three phase induction motor NEMA D motor working by changing the voltage of 460V, 420V, 380V and 340V at rated load of 10% to 60% for energy saving. The results showed the lower the voltage the greater the energy savings obtained, a decline in the biggest power on the condition of maximum torque at the slip value = 70%. In the experiment of working voltage 380V with a load of 10% -60% decline in velocity of 183 to 154 ppd, and the resulting increase in efficiency by 3% to 18% and get increased power output rose to 2.5 KW
 

PENGGUNAAN PROTOKOL ROUTING OPEN SHORTEST PATH FIRST (OSPF) DI JARINGAN TCP/IP

Submitted by admin on

PENGGUNAAN PROTOKOL ROUTING OPEN SHORTEST PATH FIRST (OSPF) DI JARINGAN TCP/IP -

Agus Haryawan

TCP/IP is a set of protocols used to communicate across the internet. In TCP/IP there is a protocol that deso the process of finding communication path. This protocol is called routing protocol. One of the routing protocols used on TCP / IP network is Open Shortest Path First (OSPF) protocol.
OSPF was designed and developed as a substitute for Routing Information Protocol (RIP), which proved to have many shortcomings when applied to large and complex TCP / IP networks. This protocol included is a link-state protocol. Each node will know the topology of the entire network because each node stores a copy of an updated network map on a regular basis. Based on his complete knowledge it in its network topology, it will determine the best path to be taken to a destination. 
In this article writer makes a software that simulates the calculation of the shortest path first algorithm used by the OSPF routing protocol to find the best path based on the known network topology. Programs created using Microsoft Visual Basic 6.0

PENGARUH PUTARAN MESIN TERHADAP EMISI GAS BUANG

Submitted by admin on

PENGARUH PUTARAN MESIN TERHADAP EMISI GAS BUANG -

Warsito

Influence Machine Rotation to Gas Emission Throw Away. Technique automotive. Polytechnic Pratama Mulia Surakarta, 2008. Gas emission throw away recently mount swiftly one of its cause its ever greater is motor vehicle usage. Along with its excelsior usage motor vehicle hence its excelsior usage motor vehicle of hence excelsior also gas emission throw away yielded. Gas emission throw away yielded by vehicle influenced several things, one of them is fuel mixture. If a vehicle less precise in arranging mixture fuel and air hence emission which yielded will progressively mount on that account we need test-drive to determine amount of mixture correct air and fuel to lessen gas mission throw away the motor vehicle. After done several times attempt hence can be pulled one conclusion that is for the mixture correct fuel is 1 : 14,8 that is to 1 fuel gram and 14,8 for the air. Influence of machine Rotation to gas emission throw away for rate HC happened the degradation of high rotation, while for the rate CO and CO2 tend to go up high rotation.

PERANAN STUDI PUSTAKA DALAM PENELITIAN DAN PENULISAN KARYA ILMIAH

Submitted by admin on

PERANAN STUDI PUSTAKA DALAM PENELITIAN DAN PENULISAN KARYA ILMIAH -

Burhan Ibnu Mubtadi

Phenomena that exist among lectar or teacher, partly the result of research reports and writing scientific papers from the literature suggested writing seems less strong, as a result the writing was less steady, although the possibility of having a high enough contribution. Writing a good book study and think the right will provide a systematic flow and logical. Discussion of literature as a theoretical framework will bring up a framework on the basis of relevant theories, so the discussion of issues raised in strict accordance with the substantive content and scholarly factor accountable. Writing literature sangal important role and have a high contribution to the process of research and writing scientific papers. With the correct puslaka study research process will be smooth, and can create solutions that really useful to reveal.
 

Pages

Subscribe to POLITEKNOSAINS