Relevant bibliographies by topics / Shafting – Testing

Academic literature on the topic 'Shafting – Testing'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Shafting – Testing"

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Feng, Wei Dong, Wen Xu, and Xian Hong Wang. "Error Analysis and Testing on Shafting Verticality for Horizontal Photoelectric Theodolite." Advanced Materials Research 791-793 (September 2013): 1002–5. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1002.

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It is vitally important to improve effects of error compensation for horizontal photoelectric theodolite and reduce production costs by executing rational control of verticality error of shafting. This paper analyzes the mechanism how the verticality error of shafting influences measurement precision of photoelectric theodolite considering the architectural characteristics of the frame of horizontal theodolite. Matlab software has been used to simulate pointing accuracy. Verticality error of shafting of horizontal theodolite has been detected. Measured verticality error of shafting is 37 and detection error is 10. Results of analysis and detection to be applied for error compensation can improve pointing accuracy of the theodolite.
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Xiao, Nengqi, Ruiping Zhou, Xiang Xu, and Xichen Lin. "Study on Vibration of Marine Diesel-Electric Hybrid Propulsion System." Mathematical Problems in Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8130246.

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This study analyzes the characteristics of hybrid propulsion shafting and builds mathematical models and vibration equations of shafting using the lumped parameter method. Main focus is on the asymmetric double diesel propulsion shafting operation process and the impact of the phase angle and motor excitation on torsional vibration of shafting. Model result is validated by testing results conducted on double diesel propulsion shafting bench. Mathematical model and model-building methods of shafting are correct.
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3

Wen, Xiao Fei, Qiang Yuan, Jin Shu Lu, and Zhen Dong Cui. "Analysis of Propulsion Shafting Torsional Vibration of Vessels with Double Engines and Double Propellers." Advanced Materials Research 479-481 (February 2012): 1310–13. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1310.

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The powerful propulsion system of vessels with double engines and double propellers is commonly used for harbor utility crafts, offshore platform supply vessels and etc.. Their shafting torsional vibration evaluation methods differ from those of one-engine vessels, so it is necessary to use appropriate methods to get scientific evaluation results of the two kinds of shafting. For vessels with double engines and double propellers, the shafting torsional vibration is calculated theoretically by specialized calculation software; a practical scheme is designed and put into use to the real ship testing. The torsional vibration test data of four sets of propulsion shafting of two ships were collected and analyzed. The preliminary results drawn from the analysis can provide references for ship shafting torsional vibration test and analysis.
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Tang, Changliang, Liyong Wang, and Tao Chen. "Dynamic testing and analysis of turbine generator shafting." Journal of Engineering 2019, no. 23 (December 1, 2019): 8619–23. http://dx.doi.org/10.1049/joe.2018.9068.

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Zhang, Zhi Gang. "Experimental Study on Reducing Diesel Engine Noise by Using Torsional Vibration Damper." Applied Mechanics and Materials 321-324 (June 2013): 90–93. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.90.

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The noise of the engine and torsional vibration of the engine’s shafting is been tested. The engine is a direct injection turbo charge inter-cooling four cylinders one. In the testing, the original pulley and three different torsional vibration dampers are compared.The result shows that it can reduce the vibration of the shafting, triangular belt, the accessory, and can reduce 1 to 2 decibel of the engine’s sound power level by using the torsional vibration damper.
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Wen, Xiao Fei, Xing Di Wang, and Qiang Yuan. "A Study on Test Technology of Ship Shafting Torsional Vibration." Advanced Materials Research 199-200 (February 2011): 1423–28. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1423.

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Ship shafting is a key component of ship power plant. Torsional vibration test for ship shafting is the essential step to ensure the safety of ship power systems. For the purpose of analyzing and comparing torsional vibration test methods, a study of the test methods, equipment and technology is carried out in this paper. Three different test methods are compared with each other by adopting two different test systems. The main propulsion and marine generator shafting torsional vibration characteristics are analyzed by using two different analysis methods respectively: the single order and resonance point method and the multi order and resonance point method. The results obtained in the process of testing on board ship may provide a good guidance for the further researches in this subject.
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Shadley, J. R., and J. R. Sorem. "Damped Absorber Optimization and Stability for Semi-Definite Systems Exhibiting Unstable Self-Excitation During Start-Up." Journal of Vibration and Acoustics 114, no. 1 (January 1, 1992): 47–53. http://dx.doi.org/10.1115/1.2930233.

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Stability is examined with respect to the torque in the elastic element between motor and load in semi-definite systems exhibiting unstable self-excitation during start-up. Equations are provided for optimizing a motor-mounted damped absorber to minimize the torque fluctuations in the shafting between motor and load in semi-definite systems. Minimum damper inertia needed to stabilize the system is computed assuming optimum damping. Stability and damper optimization equations are applied to two cases involving unstable self-excitation in electric submersible pump systems. In the first case, unstable growth of torque amplitude in shafting between an electric induction motor and an inertial load was observed during start-up in laboratory testing. A computer simulation of the system dynamics demonstrated that the torque could be stabilized by adding a damped absorber to the motor. In a computer simulation for the second case, unstable torque fluctuations in the shafting of an electric submersible pump system were dramatically reduced by the addition of a damped absorber; however, stability was not achieved until the damper inertia was sufficiently increased. Stability is not always required for safe operation of electric submersible pumps. A computational model of the system dynamics during startup should be used to determine when stability is required.
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Yin, Bing Kuan, Hai Gang Hu, Xin Zhou, and Lin Wei Zhang. "The Monitoring and Fault Diagnosis System for Controllable Pitch Propeller Based on LabVIEW." Applied Mechanics and Materials 635-637 (September 2014): 851–55. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.851.

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The monitoring and fault diagnosis system for controllable pitch propeller is based on modern testing technology, fieldbus technology, monitoring and diagnosis technology, computer technology. The equipment consists of various types of sensors, CANopen bus devices, LabVIEW and computer, which can monitor the CPP’s operating parameters, including shaft system vibration, shaft speed, pitch angle, liquid level of gravity tank, pressure and temperature of hydraulic system, and the system can also alarm if three typical fault of shafting occurs.
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Liu, Zihao, Wanyou Li, and Huajiang Ouyang. "Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances." Shock and Vibration 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/2403426.

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Torsional vibration of shafts is a very important problem in engineering, in particular in ship engines and aeroengines. Due to their high levels of integration and complexity, it is hard to get their accurate structural data or accurate modal data. This lack of data is unhelpful to vibration control in the form of structural modifications. Besides, many parts in shaft systems are not allowed to be modified such as rotary inertia of a pump or an engine, which is designed for achieving certain functions. This paper presents a strategy for torsional vibration control of shaft systems in the form of structural modifications based on receptances, which does not need analytical or modal models of the systems under investigation. It only needs the torsional receptances of the system, which can be obtained by testing simple auxiliary structure attached to relevant locations of the shaft system and using the finite element model (FEM) of the simple structure. An optimization problem is constructed to determine the required structural modifications, based on the actual requirements of modal frequencies and mode shapes. A numerical experiment is set up and the influence of several system parameters is analysed. Several scenarios of constraints in practice are considered. The numerical simulation results demonstrate the effectiveness of this method and its feasibility in solving torsional vibration problems in practice.
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Luo, Haitao, Jia Fu, Changshuai Yu, Guangming Liu, Wei Wang, and Peng Wang. "Numerical simulation and experimental testing of dynamic stiffness of angular contact ball bearing." Advances in Mechanical Engineering 10, no. 9 (September 2018): 168781401879897. http://dx.doi.org/10.1177/1687814018798973.

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Angular contact ball bearings are widely used in the multiple rotor system, such as gear box, machine tool spindle, and aero-engine rotors. The support stiffness is very important to the vibration of shafting. In order to obtain the dynamic stiffness, a numerical simulation method for dynamic stiffness of angular contact ball bearings is presented. By means of LS-DYNA software, the displacement and stress curves of the bearing’s different components are obtained successfully, and then, the dynamic stiffness of bearing under certain working conditions also can be calculated. The maximum envelope radius of the inner ring of the measured bearing can be taken as the relative displacement change value of the inner and outer rings of the bearing. To obtain the dynamic stiffness, the test strategy for dynamic stiffness of the angular contact ball bearings is introduced. The experimental results show that the equivalent dynamic stiffness increases with the increase in the preload of measured bearing under certain conditions. The simulation result coincides with the experiments well. The research work can provide the basis for the design and dynamics analysis of the bearing rotor system and have important engineering significance to improve the service performance of angular contact ball bearings.
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Dissertations / Theses on the topic "Shafting – Testing"

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Ilic, Slobodan Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Methodology of evaluation of in-service loads applied to the output shafts of automatic transmissions." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/30172.

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This work presents a novel methodology for evaluation of in service loads applied to the output shafts of automatic transmissions. It also presents a novel methodology of data reduction for shaft load signals as an alternative to the cycle counting methods. Current durability testing of automatic transmission output shafts uses 50 000 stall torque cycles from zero to wide open throttle. In the majority of cases, these requirements lead to an over design that can result in an unnecessarily bulky transmission system. As a solution to this problem a novel methodology for evaluation of loads applied to the output shafts of automatic transmissions was developed. The methodology is based on real world loading conditions and therefore leads to a more realistic estimation of the fatigue life of shafts. The methodology can be used as a tool for shaft optimisation in different drive conditions. Using the developed methodology the effects of different road conditions on the fatigue life of a transmission output shaft were compared. Four routes having differing driving conditions were investigated and of those routes, the route with most stop-start events resulted in the greatest reduction in fatigue life. A novel methodology of data reduction for shaft load signals was also developed. The methodology is based on knowledge of the bandwidth and dynamic range of the expected in-service load signal. This novel methodology allows significant reduction of the volume of data to be acquired. It preserves the time sequence of peaks and valleys of the signal, which is vital in the case of fatigue analysis. This is in contrast to current methods based on cycle counting. Cycle counting methods achieve high data reduction but do not preserve the time sequence of the signal. The developed novel methodology has been validated on the newly developed data acquisition system capable of real time data acquisition and compression of shaft torque signal. The performed tests show that the proposed one-channel low cost system equipped with 1 GB compact flash card can store well over 10 000 hrs of load history.
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Varonis, Orestes J. "Eddy Current Characterization of Stressed Steel and the Development of a Shaft Torque Eddy Current System." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1221065617.

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Books on the topic "Shafting – Testing"

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Neale, M. J. Couplings and shaft alignment. Bury St Edmunds: Professional Engineering Pub., 1998.

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Neale, M. J. Guide to wear problems and testing for industry. Norwich, N.Y: William Andrew Pub., 2001.

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G, Gee M., ed. Guide to wear problems and testing for industry. London: Professional Engineering Pub., 2000.

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Neale, Michael J., and Mark Gee. Guide to Wear Problems and Testing for Industry (Tribology in Practice Series). John Wiley & Sons, 2005.

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5

Needham, Paul, Michael Neale, and Roger Horrell. Couplings and Shaft Alignment (Tribology in Practice). Wiley, 2005.

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Conference papers on the topic "Shafting – Testing"

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Hackel, Lloyd A., and Jon E. Rankin. "Lifetime Enhancement of Propulsion Shafts Against Corrosion-Fatigue by Laser Peening." In SNAME 15th Propeller and Shafting Symposium. SNAME, 2018. http://dx.doi.org/10.5957/pss-2018-01.

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This paper reports substantially enhanced fatigue and corrosion-fatigue lifetimes of propulsion shaft materials, 23284A steel and 23284A steel with In625 weld overlay cladding, as a result of shot or laser peening. Glass reinforced plastic (GRP) coatings and Inconel claddings are used to protect shafts against general corrosion and corrosion pitting. However salt water leakage penetrating under a GRP can actually enhance pitting leading to crack initiation and growth. Fatigue coupons, untreated and with shot or laser peening were tested, including with simultaneous salt water immersion. Controlled corrosion of the surfaces was simulated with electric discharge machining (EDM) of deep pits enabling evaluation of fatigue and corrosion-fatigue lifetimes. Results specifically show high energy laser peening (HELP) to be a superior solution, improving corrosion-fatigue resistance of shaft and cladding metal, reducing the potential for corrosion pits to initiate fatigue cracks and dramatically slowing crack growth rates. At a heavy loading of 110% of the 23284A steel yield stress and with 0.020 inch deep pits, laser peening increased fatigue life of the steel by 1370% and by 350% in the corrosion-fatigue testing.
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2

Fasterding, Gerald, and Hagen Birkholz. "Down Angle Gearboxes – Calculation and Manufacturing Innovation for Low Noise Beveloid Gears." In SNAME 15th Propeller and Shafting Symposium. SNAME, 2018. http://dx.doi.org/10.5957/pss-2018-09.

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Conical involute gears, also known as beveloid gears, are used in marine gearboxes to provide an angle between the drive shaft and the output shaft. The axes of the beveloid gear meshes reviewed can be intersecting or skewed. Beveloid gears are a general case of spur gears with their virtual generating rack cutter tilted in the direction of feed. An appropriate variable addendum modification along the face width leads to conjugate flanks and therefore to tooth line contact. The elasticity of the gear mesh itself, the shafts, bearings and the gear housing cause deformations and deflections. Thus a tip relief at the generating tool in combination with flank modifications is applied to improve strength and transmission characteristics. Noise emission is reduced by comparing the level of dynamic excitation of different profile corrections. Strength calculations are done with local stresses, since there is no standardized nominal stress assessment. Theoretical evaluations are confirmed by prototype testing. This integrated designing procedure allows for an efficient planning and engineering for special beveloid gears. Several examples of application will be shown.
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Liang, Xingyu, Kang Yang, Gequn Shu, Yuesen Wang, Linlin Tan, and Yonghui Wen. "Analysis of Two-Dimensional Bending Vibration of an Internal Combustion Engine’s Shafting System Based on Wave Equation." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63017.

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Reciprocating machines are widely used in many mechanical industries. Bending vibration of spinning components, such as the shaft system of a high-speed power engine (vehicles, ships, helicopters, etc.), turbine engines and generators usually requires the integration of both design and analysis. The general method to analyze vibration is the discretization method. The bending/torsion/axial vibration of these systems is often solved using the lumped parameter method, in which small diameter long shafts are neglected by concentrated masses. Well known since the Holzer’s tabulating methods, many researchers proposed both transfer matrix and extended transfer matrix methods to solve free and/or forced vibration under dampened and/or undampened vibration based on discrete methods. In many situations, however, the results from a discrete method couldn’t exactly agree with actual results. In particular, in bending vibration analysis there is no correction and precision method to calculate bending vibration of multi-stepped spin shafts because the shafts are often treated as one dimensional vibration. We should therefore develop a new precision method to analyze two-dimensional bending vibration of shaft systems. In this paper, a new precise approach is proposed to study and calculate the bending vibration of multi-step systems with N-stepped changes of their property under rotary conditions, supported by N+1 springs and dampers governed by a two-dimensional wave equation. At first, the author analyzed the source of bending vibration. When a crankshaft is excited by external forces which can be divided into vertical and horizontal forces, the shaft will deform in two planes. Then strain and stress equations of the spin shaft are established, applied to the Hamilton Principle, and a two-dimensional wave equation is established. After that, to simplify, the author deduced the calculation formula of one dimensional bending vibration — a sine exciting force acted on arbitrary concentrated masses between point No.1 and No.N+1. By using this formula, the total dynamic response of additional force can be obtained through a general procedure of superposition. And then, the influence of the coupled product of inertia is discussed and the two-dimensional dynamic response is obtained. To demonstrate the theoretic analysis, we checked the prediction using the bending vibration of a highspeed diesel engine’s crankshaft. By using a newly-designed axial/ torsion/ bending vibration testing device, we measured the bending vibration at the front free-end of the crankshaft. When the calculated results were compared with measured results, they agreed with each other. This verified that the author’s proposed new method to study bending vibration is warranted and correct.
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