scholarly journals Preliminary Design of a Power Transmission Shaft under Fatigue Loading Using ASME Code

2018 ◽  
Vol 11 (1) ◽  
pp. 227-244 ◽  
Author(s):  
Stephen K. Armah
Keyword(s):  
Power Transmission ◽  
Fatigue Loading ◽  
Preliminary Design ◽  
Transmission Shaft ◽  
Asme Code

Demonstration of a Unified Approach to the Balancing of Flexible Rotors

1981 ◽  
Vol 103 (1) ◽  
pp. 101-107 ◽  
Author(s):  
M. S. Darlow ◽  
A. J. Smalley ◽  
A. G. Parkinson
Keyword(s):  
Power Transmission ◽  
Substantial Reduction ◽  
Influence Coefficient ◽  
Flexible Rotor ◽  
Unified Approach ◽  
Test Rig ◽  
Multiple Mode ◽  
Flexible Rotors ◽  
Transmission Shaft ◽  
Rotor Balancing

A flexible rotor balancing procedure, which incorporates the advantages and eliminates the disadvantages of the modal and influence coefficient procedures, has been developed and implemented. This new procedure, referred to as the Unified Balancing Approach, has been demonstrated on a supercritical power transmission shaft test rig. The test rig was successfully balanced through four flexural critical speeds with a substantial reduction in effort as compared with the effort required in modal and influence coefficient balancing procedures. A brief discussion of the Unified Balancing Approach and its relationship to the modal and influence coefficient methods is presented. A series of tests which were performed to evaluate the effectiveness of various balancing techniques are described. The results of the Unified Balancing Approach tests are presented and discussed. These results confirm the superiority of this balancing procedure for the supercritical shaft test rig in particular and for multiple-mode balancing in general.

Fatigue failure of a hollow power transmission shaft

2002 ◽  
Vol 9 (4) ◽  
pp. 457-467 ◽  
Author(s):  
S.K. Bhaumik ◽  
R. Rangaraju ◽  
M.A. Parameswara ◽  
M.A. Venkataswamy ◽  
T.A. Bhaskaran ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Power Transmission ◽  
Transmission Shaft

scholarly journals Wear and Grip Loss Evaluation of High Chromium Welding Deposits Applied on Sugar Cane Rolls1

2015 ◽  
Vol 19 (2) ◽  
pp. 21
Author(s):  
Sebastian Diaz Millan ◽  
Yesid Aguilar Castro ◽  
Gonzalo Fernando Casanova García
Keyword(s):  
Cast Iron ◽  
Sugar Cane ◽  
Gray Cast Iron ◽  
Power Transmission ◽  
Standard Test ◽  
Matter Content ◽  
Gray Cast ◽  
High Chromium ◽  
Transmission Shaft ◽  
Geometric Changes

Wear on sugar cane rolls is an expensive maintenance problem for the sugar cane industry. Wear produces loss of sucrose extraction and loss of grip of the roll on the bagasse. This paper presents the evaluation of wear and loss of grip of hypoeutectic and hypereutectic high chromium welding deposits applied on ASTM A-36 steel and gray cast iron. A modified ASTM G-65 standard test was used. Wear was produced by the abrasive action of wet bagasse with three levels of mineral extraneous matter. Silica grains with sizes in the range of 0.212-0.300 mm (AFS 50/70) were used as mineral extraneous matter. Grip was evaluated by measuring the torque on the power transmission shaft that moves the specimens. Worn surfaces were characterized by using scanning electron microscopy. Wear was found to increase proportionally related to the mineral extraneous matter content. Geometric changes of the weld deposits related to wear caused grip loss. For low mineral extraneous matter level, wear resistance of carbon steel was greater than that of gray cast iron; whereas the opposite was found for high mineral extraneous matter level.

scholarly journals Elastomer Damper Performance: A Comparison With a Squeeze Film for a Supercritical Power Transmission Shaft

1980 ◽  
Author(s):  
E. S. Zorzi ◽  
G. Burgess ◽  
R. Cunningham
Keyword(s):  
Critical Power ◽  
Power Transmission ◽  
Squeeze Film ◽  
Squeeze Film Damper ◽  
Operating Range ◽  
Transmission Shaft ◽  
Bending Mode ◽  
Squeeze Film Dampers ◽  
Design And Testing

This paper describes the design and testing of an elastomer damper on a super-critical power transmission shaft. The elastomers were designed to provide acceptable operation through the fourth bending mode and to control synchronous as well as nonsynchronous vibration throughout the operating range. The design of the elastomer was such that it could be incorporated into the system as a replacement for a squeeze-film damper without a reassembly, which could have altered the imbalance of the shaft. This provided a direct comparison of the elastomer and squeeze-film dampers without having to assess the effect of shaft imbalance changes.

scholarly journals Design Criteria for High Power Engines Crankshafts

2015 ◽  
Vol 9 (1) ◽  
pp. 271-281 ◽  
Author(s):  
S. Baragetti
Keyword(s):  
Mechanical System ◽  
Power Transmission ◽  
Numerical Procedure ◽  
Linear Displacement ◽  
Design Criteria ◽  
Critical Component ◽  
Strain Behavior ◽  
Element Simulation ◽  
Transmission Shaft ◽  
Numerical Finite Element

The reliability of any mechanical system, in which the linear displacement of a piston is converted into the rotation of a power transmission shaft, strongly depends on the reliability of the crankshaft. The crankshaft is the critical component and any damage occurring to the crankshaft may put the mechanical system out of order. The numerical finite element simulation of crankshafts with multiple rods is often time consuming even if quite accurate if the aim is to evaluate the stress-strain behavior at the notched area and verify the component. The development of a simplified numerical model would prove effective to reduce the time needed to reach a good approximation design of the crankshaft. The aim of this paper is to give the designer a numerical procedure that allows to determine the strain and stress state and verify crankshafts having two or more rods.

Issues in structural fatigue design and evaluation

1994 ◽  
Vol 21 (6) ◽  
pp. 903-912 ◽  
Author(s):  
A. C. Agarwal ◽  
P. C. Birkemoe ◽  
A. P. Goel ◽  
R. A. P. Sweeney ◽  
J. C. Thompson ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Transmission Lines ◽  
Crack Detection ◽  
Power Transmission ◽  
Fatigue Loading ◽  
Offshore Structures ◽  
Power Transmission Lines ◽  
Local Boundary ◽  
Fatigue Design ◽  
Stress Concentration Region

Current practices in the design and evaluation of structural components for fatigue are generally semi-empirical. This is because either it is not practical or economical to realistically simulate field conditions in the laboratory testing or the actual conditions are not known precisely. Fatigue life curves based on the constant amplitude cyclic loading may result in unconservative design and evaluations where real load cycles are variable and the loads are of transient nature. There is a need to apply probability-based principles to the fatigue considerations, particularly in the areas of developing representative fatigue loading, and fatigue crack detection. In the area of power transmission lines, there is a need for better understanding of the failure mechanism and rationalize the fatigue design provisions. The state of stress within a stress concentration region depends only on the local boundary geometry, the magnitude of the resultant force, and the material type. This equivalence of stress concentration regions can be exploited to develop design aids for stress concentration factors independent of the global conditions. This paper identifies the above issues in detail and establishes some specific areas where there is a need for improvement in the current practice. Key words: fatigue, structural design, structural evaluation, bridges, power transmission lines, offshore structures.

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