A device for conversion of shaft rotation angle and speed to a code

1992 ◽  
Vol 35 (4) ◽  
pp. 453-455
Author(s):  
S. I. Bogomolov
Keyword(s):  
Rotation Angle ◽  
Shaft Rotation ◽  
Shaft Rotation Angle

scholarly journals Influence of Water and Mineral Oil on the Leaks in Satellite Motor Commutation Unit Clearances

2017 ◽  
Vol 24 (3) ◽  
pp. 58-67 ◽  
Author(s):  
Paweł Śliwiński
Keyword(s):  
Rotation Angle ◽  
Mineral Oil ◽  
Fluid Viscosity ◽  
Working Chamber ◽  
Shaft Rotation ◽  
Influence Of Water ◽  
Mathematical Formulas ◽  
Working Media ◽  
Shaft Rotation Angle ◽  
Geometrical Dimensions

Abstract The article describes the flow rates of mineral oil and water flowing, as working media, through the commutation unit of a hydraulic satellite motor. It is demonstrated that geometrical dimensions of commutation unit clearances change as a function of the machine shaft rotation angle. Methods for measuring the rate of this flow and the pressure in the working chamber are presented. The results of pressure measurements in the working chamber during the transition from the filling cycle to the emptying cycle are included. The pressure in the motor’s working chamber changes linearly as a function of the shaft rotation angle, which has a significant effect on the leakage in the commutation unit clearances. The paper presents new mathematical formulas in the form: Q=f(Δpγ) to calculate the flow rate of water and mineral oil in the commutation unit clearances. The γ factor is described as a function of fluid viscosity and clearance length (the motor shaft rotation angle). The coefficients used in these formulas were determined based on the results of laboratory tests of a motor supplied with water and mineral oil.

scholarly journals Study of the press forming mechanism of a thermoforming machine

2013 ◽  
Vol 228 (10) ◽  
pp. 1715-1723 ◽  
Author(s):  
Guido Belforte ◽  
Federico Colombo ◽  
Terenziano Raparelli ◽  
Daniela Maffiodo
Keyword(s):  
Rotation Angle ◽  
Equations Of Motion ◽  
Numerical Code ◽  
Internal Stresses ◽  
Motor Shaft ◽  
Forming Mechanism ◽  
Press Forming ◽  
The Press ◽  
Parametric Studies ◽  
Shaft Rotation Angle

The paper presents kinematic and dynamic investigations of the main press forming mechanism of a thermoforming machine. A multibody analysis of this press forming mechanism, which lifts and rotates a press bed, was carried out. Press bed lifting, which is necessary to form the component, is performed by means of a first rod and toggle mechanism. Press bed rotation to eject the formed component is produced by means of a second rod and must be appropriately shifted. These rods are oscillating followers driven by cams, making it possible to precisely define trajectories as a function of the motor shaft rotation angle. Analysis is performed by numerically solving the equations of motion. Cam synthesis on the basis of the oscillating followers’ trajectories makes it possible to obtain cam profiles in order to evaluate pressure angles and check that there is no undercutting. System dynamics is investigated in order to evaluate motor torque and analyse internal stresses on the hinges. In addition, some experimental results and those obtained with the dynamic model are compared. Performance improvement of the actual machine is carried out by modifying the trajectory of the press bed by means of a numerical code at the purpose developed. This approach is more convenient than the use of a commercial multibody code, which is not specifically built for parametric studies.

Dynamic Model and Numerical Simulation for Synchronal Rotary Compressor

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Hui Zhou ◽  
Zongchang Qu ◽  
Hua Yang ◽  
Bingfeng Yu
Keyword(s):  
Relative Velocity ◽  
Rotation Angle ◽  
Structural Characteristics ◽  
Side Surface ◽  
Mechanical Efficiency ◽  
The Other ◽  
Rotary Compressor ◽  
Working Principle ◽  
Shaft Rotation Angle ◽  
Average Relative Velocity

The synchronal rotary compressor (SRC) has been developed to resolve high friction and severe wear that usually occur in conventional rotary compressors due to the high relative velocity between the key tribo-pairs. In this study, the working principle and structural characteristics of the SRC are presented first. Then, the kinematic and force models are established for the key components—cylinder, sliding vane, and rotor. The velocity, acceleration, and force equations with shaft rotation angle are derived for each component. Based on the established models, numerical simulations are performed for a SRC prototype. Moreover, experiments are conducted to verify the established models. The simulated results show that the average relative velocity between the rotor and the cylinder of the present compressor decreases by 80–82% compared with that of the conventional rotary compressors with the same size and operating parameters. Moreover, the average relative velocity between the sliding contact tribo-pairs of the SRC decreases by 93–94.3% compared with that of the conventional rotary compressors. In addition, the simulated results show that the stresses on the sliding vane are greater than those on the other components. The experimental results indicate that the wear of the side surface of the sliding vane is more severe than that of the other components. Therefore, special treatments are needed for the sliding vane in order to improve its reliability. These findings confirm that the new SRC has lower frictional losses and higher mechanical efficiency for its advanced structure and working principle.

Structure and migration of planar defects in crystals observed in atomic scale

1978 ◽  
Vol 36 (1) ◽  
pp. 284-285 ◽  
Author(s):  
H. Hashimoto ◽  
Y. Sugimoto ◽  
Y. Takai ◽  
H. Endoh
Keyword(s):  
Electron Microscope ◽  
Rotation Angle ◽  
Crystal Surface ◽  
Electron Gun ◽  
Atomic Scale ◽  
Present Observation ◽  
Twist Boundary ◽  
Optical Magnification ◽  
Zinc Crystal ◽  
And Migration

As was demonstrated by the present authors that atomic structure of simple crystal can be photographed by the conventional 100 kV electron microscope adjusted at “aberration free focus (AFF)” condition. In order to operate the microscope at AFF condition effectively, highly stabilized electron beams with small energy spread and small beam divergence are necessary. In the present observation, a 120 kV electron microscope with LaB6 electron gun was used. The most of the images were taken with the direct electron optical magnification of 1.3 million times and then magnified photographically.1. Twist boundary of ZnSFig. 1 is the image of wurtzite single crystal with twist boundary grown on the surface of zinc crystal by the reaction of sulphur vapour of 1540 Torr at 500°C. Crystal surface is parallel to (00.1) plane and electron beam is incident along the axis normal to the crystal surface. In the twist boundary there is a dislocation net work between two perfect crystals with a certain rotation angle.

Musculoskeletal disorder risk associated with auto rotation angle during an assembly task

2009 ◽  
Author(s):  
Sue A. Ferguson ◽  
William S. Marras ◽  
W. Gary Allread ◽  
Gregory G. Knapik ◽  
Kimberly A. Vandlen ◽  
...  
Keyword(s):  
Musculoskeletal Disorder ◽  
Rotation Angle ◽  
Assembly Task ◽  
Disorder Risk

scholarly journals Motility Improvement of Biomimetic Trachea Scaffold via Hybrid 3D-Bioprinting Technology

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 971
Author(s):  
Young Soo Yu ◽  
Chi Bum Ahn ◽  
Kuk Hui Son ◽  
Jin Woo Lee
Keyword(s):  
Rotation Angle ◽  
Thick Layer ◽  
Cartilage Tissue ◽  
Soft Tissue Reconstruction ◽  
3D Bioprinting ◽  
Rotating Beam ◽  
Rotational Angle ◽  
Gelatin Hydrogel ◽  
Tissue Reconstruction ◽  
Neck Rotation

A trachea has a structure capable of responding to various movements such as rotation of the neck and relaxation/contraction of the conduit due to the mucous membrane and cartilage tissue. However, current reported tubular implanting structures are difficult to impelement as replacements for original trachea movements. Therefore, in this study, we developed a new trachea implant with similar anatomical structure and mechanical properties to native tissue using 3D printing technology and evaluated its performance. A 250 µm-thick layer composed of polycaprolactone (PCL) nanofibers was fabricated on a rotating beam using electrospinning technology, and a scaffold with C-shaped cartilage grooves that mimics the human airway structure was printed to enable reconstruction of cartilage outside the airway. A cartilage type scaffold had a highest rotational angle (254°) among them and it showed up to 2.8 times compared to human average neck rotation angle. The cartilage type showed a maximum elongation of 8 times higher than that of the bellows type and it showed the elongation of 3 times higher than that of cylinder type. In cartilage type scaffold, gelatin hydrogel printed on the outside of the scaffold was remain 22.2% under the condition where no hydrogel was left in other type scaffolds. In addition, after 2 days of breathing test, the amount of gelatin remaining inside the scaffold was more than twice that of other scaffolds. This novel trachea scaffold with hydrogel inside and outside of the structure was well-preserved under external flow and is expected to be advantageous for soft tissue reconstruction of the trachea.

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