نتایج جستجو برای: rotating die

تعداد نتایج: 159605  

Journal: :journal of applied and computational mechanics 0
saeed talebi department of mechanical engineering, university of isfahan hamed uosofvand department of mechanical engineering, university of kashan, kashan, iran alireza ariaei department of mechanical engineering, faculty of engineering, university of isfahan, isfahan, iran

this study introduces the differential transform method (dtm) to analyse the free vibration response of a rotating, closed section, composite, timoshenko beam which features material coupling between flapwise bending and torsional vibrations due to ply orientation. the governing differential equations of motion are derived using hamilton’s principle and solved by applying dtm. the natural frequ...

The purpose of introducing ultrasonic vibrations in the tube hydroforming process is to create more formability by obtaining a lower corner radius, improve thickness distribution of the wall and provide good tribological conditions at the tube and the die interface. Vibrations imposed on the die create alternating gaps which improve the formability in the tube hydroforming process in the presen...

ژورنال: طب کار 2013
اصغری, مهدی, عباسی نیا, مرضیه, قائمیان, نوید , محمدیان, فاروق , محمودخانی, سمیه , منظم, محمدرضا,

Background: High levels of fatigue in the workplaces can lead to reduced productivity, and increase the risk of accidents and injuries. Purpose of this study was to assess and compare the fatigue levels among fixed-dayshift and rotating-shift workers of a rolling mills and steel production company in tehran. Methods: The study included 180 workers with fixed- and rotating-shift schedules. The ...

We present a numerical study of the rotating flow generated by two rotating disks in co-/counter-rotating, inside a fixed cylindrical enclosure similar to the Czochralski configuration (Cz).  The enclosure having an aspect ratio A = H/Rc equal to 2, filled with a low Prandtl number fluid (Pr = 0.011), which is submitted to a vertical temperature gradient. The finite volume method has been used ...

The purpose of this research was to suggesting a model of factors affecting on promoting the resilience of rotating staff in Iranian Oil Terminals Company. This research was conducted using qualitative method and thematic analysis based on inductive and need-based method. The statistical population of this research was the rotating staff of Iranian Oil Terminals Company. The statistical populat...

2012

The purpose of this note is mainly pedagogical. An apparent paradox will be described which arises in this connection. From the resolution of this paradox one may learn two things. First, one realizes that there are, in a certain sense, two different kinds of Lorentz contractions. Secondly, one sees most clearly how the nonEuclidean space geometry comes into being if the disc is set rotating. C...

2001
P. W. Kiedron J. L. Berndt L. C. Harrison J. J. Michalsky

A possibility of measuring water vapor column from diffuse irradiance, and thus the extension of optical retrievals to cloudy days, was investigated. The data from the Rotating Shadowband Spectroradiometer (RSS) during its winter deployment at the North Slope of Alaska (NSA) site is used. The initial analysis covers 20 days in March 1999 that include clear, partly cloudy, and overcast days. Dur...

2006
John R. WiLson Jack L. Martin

To determine If patients with rest angina have more severe regional Isehemla than padents with exertlonal aiigln., we compared the severity of left coronary artery (LCA) stenods In 29 patIents with transient anterior chemIc S’ -T changes at rest, and 30 patIents with anterior ST changes only during exertion. The percentage diameter stenosis w measured with Vernier calIpers (2 X lesion diameter ...

2017
Jonathan Briere Mohannad Y. Elsayed Menouer Saidani Martin Bérard Philippe-Olivier Beaulieu Hadi Rabbani-Haghighi Frederic Nabki Michaël Ménard

This work presents a laterally rotating micromachined platform integrated under optical waveguides to control the in-plane propagation direction of light within a die to select one of multiple outputs. The platform is designed to exhibit low constant optical losses throughout the motion range and is actuated electrostatically using an optimized circular comb drive. An angular motion of ±9.5◦ us...

2014
DAVID DROESCHEL DIRK HOLZ SVEN BEHNKE

Micro aerial vehicles (MAV) are restricted in their size and weight, making the design of sensory systems for these vehicles challenging. We designed a small and lightweight continuously rotating 3D laser scanner—allowing for environment perception in a range of 30 m in almost all directions. This sensor is well suited for applications such as 3D obstacle detection, 6D motion estimation, locali...

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