scholarly journals ANALISIS KOEFISIEN PENGURANGAN TATAL (CHIP REDUCTION COEFFICIENT) PADA PEMESINAN BUBUT MAGNESIUM AZ31 MENGGUNAKAN PAHAT PUTAR

2021 ◽  
Vol 11 (2) ◽  
pp. 399-409
Author(s):  
Gusri Akhyar Ibrahim ◽  
Arinal Hamni ◽  
Rofika Libiru
Keyword(s):  
Reduction Coefficient ◽  
Magnesium Az31 ◽  
Coefficient Reduction

Coefficient reduction chip atau pengurangan tatap dianalisa menggunakan Metode Anova  untuk menentukan pengaruh dari parameter input untuk setiap variasi eksperimen pada proses permesinan, sekaligus juga menentukan persentase pengaruh parameter individual. Metode Taguchi dipilih untuk mengurangi jumlah total dari percobaan yang dilakukan dan menghilangkan aspek yang tidak perlu dipertahankan, mengurangi biaya percobaan, sederhana dan mendapatkan hasil yang presisi. Penelitian ini bertujuan untuk menganalisa koefisien pengurangan tatal yang terjadi pada saat pemesinan menggunakan material paduan magnesium AZ3. Pada penelitian ini, proses pemesinan dilakukan menggunakan mesin bubut dengan jenis pahat berputar, yang mana pahat yang digunakan adalah pahat karbida jenis round insert. Sementara itu metode pengujian yang diterapkan adalah menggunakan Metode Taguchi dan ANOVA. Sementara itu, diameter benda kerja  digunakan sebesar 35 mm dan Panjang 100 mm, kedalaman potong 1 mm dan kecepatan potong 80, 120, 160 mm/min, kadar pemakanan 0,10 0,15 0,20 mm/rev, kecepatan putaran pahat 50, 80, 120 rpm. Hasil dari penelitian ini menunjukan bahwan nilai koefisian pengurangan tatal terendah sebesar adalah 1,44, yang mana diperoleh pada parameter kecepatan potong 80 mm/min, kedalaman potong 1 mm, kadar pemakanan 0,10 mm/rev dan kecepatan putaran pahat 50 rpm. Dari semua faktor yang dianalisa, didapati bahwa faktor yang berpengaruh signifikan yaitu kecepatan potong da kadar pemakanan.

NEW RESULTS IN REDUCED ESTIMATION WITH SYSTEMATIC ERRORS IN MEASUREMENTS AND THEIR APPLICATION FOR THE FORMATION OF A GROUP TIME SCALE

2018 ◽  
pp. 30-37
Author(s):  
A. P. Aleshkin ◽  
A. A. Makarov ◽  
Yu. F. Matasov
Keyword(s):  
Time Scale ◽  
Statistical Estimation ◽  
Systematic Errors ◽  
Random Component ◽  
Customer Support ◽  
Group Time ◽  
Reduction Coefficient ◽  
Systematic Component ◽  
Compression Parameter ◽  
Positive Effect

The article deals with the behavior of reduced scalar estimates in the presence of systematic errors in the observational data. The proposed procedure with a different method of forming the reduction coefficient. A quasi-optimal variant of the compression parameter formation is considered. Simulation results for different conditions of application of the proposed algorithms are presented. Currently, one of the ways to improve the accuracy of the formation of the time scale in solving the problems of frequency-time customer support is the averaging of the readings of several generators. At the same time, this approach, as shown in the theory of statistical estimation, is effective for parrying the random component of the error of the estimated process. However, for frequency generators random error can be effectively compensated for a long range of observations, but the systematic component - frequency drift - is a serious problem, which can be eliminated by averaging only under certain conditions. Therefore, the article proposes a version of the reduced estimate, effective, as shown, to parry the departure of the time scale by introducing a shift in the implementation of compression, defined by the reduction procedure. The conditions in which the degree of the achieved positive effect has a practical sense are considered.

scholarly journals Silane coatings modified with hydroxyapatite nanoparticles to enhance the biocompatibility and corrosion resistance of a magnesium alloy

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26127-26144
Author(s):  
Aida Nikbakht ◽  
Changiz Dehghanian ◽  
Rasoul Parichehr
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Cell Viability ◽  
Hydroxyapatite Nanoparticles ◽  
Magnesium Az31

Incorporation of hydroxyapatite nanoparticles in silane coatings improves both corrosion resistance and cell viability on magnesium AZ31 implants.

Study of the microstructure, bonding evolution and mechanical properties of continuously extruded magnesium AZ31 sheet

2021 ◽  
pp. 141456
Author(s):  
Lili Guo ◽  
Jingru Yuan ◽  
Jiuyang Pei ◽  
Ying Zhao ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Az31 Sheet ◽  
Magnesium Az31

Aerodynamics of Cyclist Posture, Bicycle and Helmet Characteristics in Time Trial Stage

2012 ◽  
Vol 28 (3) ◽  
pp. 317-323 ◽  
Author(s):  
Vincent Chabroux ◽  
Caroline Barelle ◽  
Daniel Favier
Keyword(s):  
Statistical Analysis ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Drag Force ◽  
Time Trial ◽  
Frontal Area ◽  
Significant Gain ◽  
Upper Limbs ◽  
Force Coefficient ◽  
Coefficient Reduction

The present work is focused on the aerodynamic study of different parameters, including both the posture of a cyclist’s upper limbs and the saddle position, in time trial (TT) stages. The aerodynamic influence of a TT helmet large visor is also quantified as a function of the helmet inclination. Experiments conducted in a wind tunnel on nine professional cyclists provided drag force and frontal area measurements to determine the drag force coefficient. Data statistical analysis clearly shows that the hands positioning on shifters and the elbows joined together are significantly reducing the cyclist drag force. Concerning the saddle position, the drag force is shown to be significantly increased (about 3%) when the saddle is raised. The usual helmet inclination appears to be the inclination value minimizing the drag force. Moreover, the addition of a large visor on the helmet is shown to provide a drag coefficient reduction as a function of the helmet inclination. Present results indicate that variations in the TT cyclist posture, the saddle position and the helmet visor can produce a significant gain in time (up to 2.2%) during stages.

The Ultimate Shear Bearing Capacity of RC Beam Strengthened with SWR External Prestressing under Dead Load Level when Strengthening

2011 ◽  
Vol 368-373 ◽  
pp. 2175-2179
Author(s):  
Tian Lai Yu ◽  
Hong Kun Han ◽  
Xin Yu Li ◽  
Qiang Ma
Keyword(s):  
Bearing Capacity ◽  
Concrete Beams ◽  
Steel Wire ◽  
Load Level ◽  
Shear Capacity ◽  
Dead Load ◽  
External Prestressing ◽  
Reduction Coefficient ◽  
Shear Bearing Capacity ◽  
The Dead

The shear resistant with SWR (steel wire rope) external prestressing is a kind of new type of reinforcement technique. The advantages of the method are ideal reinforcement effect, durability, and convenient construction. So the method has been paid attention by more and more scientists and technical workers. Through the experiment of 1 basic beam and 3 strengthened beams which are in different dead load levels, the influence of damage degree of original beams and the dead load level of strengthened beams are analyzed. The reduction coefficient values of shear capacity under different dead load level are researched. The research is shown that: with the dead load level increasing, the improve degree of shear capacity of strengthened concrete beams is smaller. The mathematical model is established, which is about dead load level and reduction coefficient of shear capacity of strengthened concrete beams. The result is to take 0.75 as the reduction coefficient of shear capacity. The value is reasonable in calculating the shear bearing capacity of strengthened beams under dead load.

A Re‐Examination of the Noise Reduction Coefficient

1941 ◽  
Vol 13 (2) ◽  
pp. 163-169 ◽  
Author(s):  
J. S. Parkinson ◽  
W. A. Jack
Keyword(s):  
Noise Reduction ◽  
Reduction Coefficient

Characterization of mechanical property of magnesium AZ31 alloy sheets for warm temperature forming

2015 ◽  
Vol 93 ◽  
pp. 204-217 ◽  
Author(s):  
Youngwoo Koh ◽  
Daeyong Kim ◽  
Dong-Yoon Seok ◽  
Jeonghwan Bak ◽  
Sang-Woo Kim ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Az31 Alloy ◽  
Warm Temperature ◽  
Magnesium Az31

Experimental study and multi-objective optimization of process parameters during turning of 100Cr6 using C-type advanced coated tools

2021 ◽  
pp. 095440622110431
Author(s):  
LR Bhandarkar ◽  
PP Mohanty ◽  
SK Sarangi
Keyword(s):  
Cutting Force ◽  
Distance Measure ◽  
Experimental Studies ◽  
Cutting Speed ◽  
Bearing Steel ◽  
Depth Of Cut ◽  
X Ray ◽  
Coated Tools ◽  
Reduction Coefficient ◽  
Machining Parameter

The drive of this research is to examine the machinability of 100Cr6 bearing steel using advanced C-type cutting tools. Experimental studies investigated the effects of machining variables on the surface quality, chip reduction coefficient and cutting force. Seven advanced coated tools were checked for characterization by micro hardness (VHN), adhesion quality, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS). The experimental trials were planned by Taguchi’s L18 orthogonal array using a mixed-level design. Two numerical machining variables feed rate and cutting speed, and one categorical machining variable tool type was taken into consideration while a constant depth of cut was kept for all trails. A combined Taguchi-Satisfaction function distance measure approach was implemented for multi-response optimization. The most promising machining parameter setting for minimization of surface roughness, cutting force, and chip reduction coefficient was identified. The most important process parameter was found to be tool-type. Ceramics tools are found to be best trailed by WC coated tools under most of the conditions. Lower tool wear was observed in the CBN tool as compared to others.

Sign in / Sign up

Export Citation Format

Share Document