Relevant bibliographies by topics / Shafting – Fatigue

Academic literature on the topic 'Shafting – Fatigue'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Shafting – Fatigue"

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Ning, Xin, Songlin Zheng, and Wenlong Xie. "Design principle of active load spectrum for shafting components in wheel hub reducer of electric vehicle." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 10 (October 3, 2018): 2546–58. http://dx.doi.org/10.1177/0954407018800569.

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Design principle of active load spectrum is proposed for the lightweight design of shafting components. The characteristics of fatigue and the strengthening effect of low-amplitude load are conducted according to the material properties of the shafting components. The stress–life curve and three-dimensional surface of low-amplitude strengthening load are established for the life calculation of shafting components. Fast calculation method of working stress for variable size of shafting components is obtained considering the road cycle in Shanghai, the load spectrum is extrapolated, the torque working condition which is equivalent to load spectrum of 3000 km is achieved, and the fatigue damage and strengthening proportion of working stress spectrum of shafting components are adjusted, finally the minimum size of shafting components is designed to meet the requirement of service life. The design principle of active load spectrum can provide a new idea for the lightweight design of automotive components.
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Loewenthal, S. H. "Factors That Affect the Fatigue Strength of Power Transmission Shafting and Their Impact on Design." Journal of Mechanisms, Transmissions, and Automation in Design 108, no. 1 (March 1, 1986): 106–14. http://dx.doi.org/10.1115/1.3260768.

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A long-standing objective in the design of power transmission shafting is to eliminate excess shaft material without compromising operational reliability. A shaft design method is presented which accounts for variable amplitude loading histories and their influence on limited life designs. The effects of combined bending and torsional loading are considered, along with a number of application factors known to influence the fatigue strength of shafting materials. Among the factors examined are surface condition, size, stress concentration, residual stress, and corrosion fatigue.
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Song, Myeong-Ho, Xuan Duong Pham, and Quang Dao Vuong. "Torsional Vibration Stress and Fatigue Strength Analysis of Marine Propulsion Shafting System Based on Engine Operation Patterns." Journal of Marine Science and Engineering 8, no. 8 (August 16, 2020): 613. http://dx.doi.org/10.3390/jmse8080613.

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Modern merchant ships use marine propulsion systems equipped with an ultra-long-stroke diesel engine that directly drives a large slow-turning propeller. Such systems use fewer cylinders and generate greater power at slower shaft speeds, which affords improved propulsion performance as well as low repair and maintenance costs. However, this also results in higher torsional vibrations, which can lead to the fatigue of the shafting system. Tests performed on various marine propulsion systems with 5- to 7-cylinder engines have shown that engines with fewer cylinders exhibit a correspondingly wider barred speed range (BSR) and higher torsional vibration stresses. Thus, it is necessary to investigate the optimal engine operation patterns required to quickly pass the BSR with smaller torsional vibration. In this study, we carried out a series of BSR passage experiments during actual sea trials to evaluate the intermediate shaft performance under different engine operation patterns. The fractional damage accumulations due to transient torsional vibration stresses were calculated to estimate the fatigue lifetime of the shafting system. Our analysis results show that the torsional fatigue damage during BSR decelerations are small and negligible; however, the fractional damage during accelerations is a matter of concern. Our study determines the optimal main engine operation pattern for quick passage through the BSR with the smallest torsional vibration amplitudes and the least fractional damage accumulation, which can therefore extend the fatigue lifetime of the entire propulsion shafting system. Based on this analysis, we also suggest the optimum engine pattern for safe BSR passage.
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Bovsunovskii, A. P. "Assessment of fatigue damage in steam turbine shafting due to torsional vibrations." Strength of Materials 43, no. 5 (September 2011): 487–97. http://dx.doi.org/10.1007/s11223-011-9318-5.

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Legaz, María José, Sergio Amat, and Sonia Busquier. "Marine Propulsion Shafting: A Study of Whirling Vibrations." Journal of Ship Research 65, no. 01 (March 17, 2021): 55–61. http://dx.doi.org/10.5957/josr.05180022.

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Whirling vibration is an important part of the calculations of the design of a marine shaft. In fact, all classification societies require a propulsion shafting whirling vibration calculation giving the range of critical speeds, i.e., free whirling vibration calculation. However, whirling vibration is a source of fatigue failure of the bracket and aft stern tube bearings, destruction of high-speed shafts with universal joints, noise, and hull vibrations. There are numerous uncertainties in the calculation of whirling vibration, namely, in the shafting system modeling and in the determination of excitement and damping forces. Moreover, whirling vibration calculation mathematics is much more complex than torsional or axial calculations. The marine propulsion shaft can be studied as a selfsustained vibration system, which can be modeled using the Van der Pol equation. In this document, a new way to solve the Van der pol equation is presented. The proposed method, based on a variational approach without local minima extra to the solution, converges for whatever initial point and parameter in the Van der Pol equation.
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Liu, Chao, Dongxiang Jiang, Jie Chen, and Jingming Chen. "Torsional vibration and fatigue evaluation in repairing the worn shafting of the steam turbine." Engineering Failure Analysis 26 (December 2012): 1–11. http://dx.doi.org/10.1016/j.engfailanal.2012.06.001.

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Kim, Yang-Gon, Kwon-Hae Cho, and Ue-Kan Kim. "Fatigue assessment of the propulsion shafting system in eco-ships with an engine acceleration problem." Journal of the Korean Society of Marine Engineering 41, no. 5 (June 30, 2017): 418–23. http://dx.doi.org/10.5916/jkosme.2017.41.5.418.

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Bovsunovskii, A. P. "Asynchronous Connection of a Turbine Generator to the Mains as a Factor of Fatigue Damage of Steam Turbine Shafting." Strength of Materials 46, no. 6 (November 2014): 810–19. http://dx.doi.org/10.1007/s11223-014-9615-x.

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Li, Zhongyi, Shiji Tian, Yefei Zhang, Hui Li, and Min Lu. "Active Control of Drive Chain Torsional Vibration for DFIG-Based Wind Turbine." Energies 12, no. 9 (May 8, 2019): 1744. http://dx.doi.org/10.3390/en12091744.

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Due to the fast electric control of the doubly-fed induction generator (DFIG) when experiencing power grid disturbance or turbulent wind, the flexible drive chain of the wind turbine (WT) generates long-term torsional vibration, which shortens the service life of the drive chain. The torsional vibration causes fatigue damage of the gearbox and affects power generation. In this paper, a two-channel active damping control measure is proposed. The strategy forms a new WT electromagnetic torque reference value through two channels: one is a proportion integration differentiation (PID) damping term with frequency difference, which is used to reduce torsional vibration caused by frequency difference between fan and shafting; the other adopts the torsional vibration angle (θs) as the feedback signal, and an additional damping term is formed by bandpass filter (BPF) and trap filter (BRF). The strategy can increase the electromagnetic torque and suppress the torsional vibration of the drive chain. Finally, modeling and simulation using MATLAB/Simulink show that the method can effectively suppress the torsional vibration of the drive chain without affecting power generation.
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Kim, Eui Soo, and Byung Min Kim. "Study of Design and Evaluation of Drum Assembly for High Speed Dehydration in Washing Machine." Key Engineering Materials 340-341 (June 2007): 1297–302. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.1297.

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Because customers are requiring front-loaded washing machine to handle big capacity laundry and have faster rotation speed to increase drying ability, there are being a lot of studies for achievement of high speed dehydration, high-strength and lightweight of washing machine in the latest washing machine business. It is essential that strength of Drum Assembly which is composed of spin drum, shaft, flange is improved to attain that target. In term of spin drum, it is difficult to realize joint strength required at high speed operation because joint strength of mechanical press-joining method is low remarkably in comparison with welding. Also in case of shaft system, stress from bending and twisting are complexly loaded onto the shaft supporting the horizontal drum, causing problems in fracture strength and fatigue life. The results of this study show optimal joining condition for mechanical press-joining by performing lots of tensile joining strength test with various specimen under multi-change of important design factor such as seaming width, bead area and bead depth etc. and the optimal design of shafting system for big capacity, high-rotation drying through strength analysis, experiment and evaluation.
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Dissertations / Theses on the topic "Shafting – Fatigue"

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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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Ma, Fong-Yuan, and 馬豐源. "Modeling Fatigue Life Reliability Analysis for the Propulsion Shafting of High-speed Vessel." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29492258697090045160.

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博士
國立臺灣海洋大學
系統工程暨造船學系
96
In Taiwan, the material of stainless steel SUS630 is usually used in propulsion shafting system for high-speed crafts. Unfortunately, the pitting corrosion will be a main factor to effect the fatigue life cycle of the stainless alloy SUS630. In this study, the prediction model of the residual fatigue life cycle and the reliability have been established under the pitting corrosion condition for the propulsion shafting system of high-speed crafts. In this study, the growth rate and tendency of pitting corrosion occurred in the stainless steel SUS630 specimen is estimated by the grey system theory through the ferric chloride acceleration corrosion test. Under such pitting corrosions, the prediction model of fatigue life has carried out by the results of the rotation bending tests on a set of specimen. Meanwhile, the constants of fatigue crack growth rate of SUS630 under pitting corrosions have been determined by means of the metallurgical graphs by SEM and the fracture surface analysis techniques. In the consequence of these processes, the residual fatigue life and the reliability of a pitting corroded stainless steel shaft can be assessed. From the results of the pitting corrosion experiment, the tendency of growth rate of pitting corrosion of the SUS630 steel is pertaining to an exponential function with time. Based on the results of fatigue tests on the specimen with pitting corrosions, the residual fatigue life cycle is only 10-20% of that of the uncorroded specimen. By the fracture surface analyses of the SEM graphs, it has shown that the direction of fatigue crack propagation between the stages of crack propagation and abrupt fracture has only a 45° angle of change. In use of the Paris formula, the value of Δk is rated between 26 to 46, the material constants n is determined to be 3 and c is 4.4×10-15 for the stainless steel SUS630 shaft material. The established model in the thesis can be applied to the preliminary design for propulsion shaft under the prescribed reliability index and estimate the allowable limitation of pitting corrosion depth and the residual fatigue life. Meanwhile, in the survey stage, this reliability model can be also applied to ascertain whether the shaft should be repaired or not, once the pitting corrosion depth is measured. Thus, the life cycle reliability and safety of the propulsion shaft system can be envisaged. Key words: propulsion shafting system of high-speed craft, stainless steel SUS630, grey system theory, corrosion fatigue and reliability
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Conference papers on the topic "Shafting – Fatigue"

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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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Batrak, Yuriy, Roman Batrak, Dmytro Berin, and Andriy Mikhno. "Propulsion shafting whirling vibration: case studies and perspective." In SNAME 14th Propeller and Shafting Symposium. SNAME, 2015. http://dx.doi.org/10.5957/pss-2015-002.

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Since 1869 the main goal of whirling vibration calculations of rotating machinery was to determine critical speeds. Currently, all Classification Societies require a propulsion shafting whirling vibration calculation (also named bending or lateral vibration calculation) in the scope of the critical speeds i.e. free whirling vibration calculation. However, fatigue failure of the bracket and aft stern tube bearings, destruction of high-speed shafts with universal joints, noise and hull vibrations, generated by shafting, indicate the importance and inevitability of forced whirling vibration calculations. This paper presents some latest results of free and forced whirling vibration calculations obtained using the software intended for shaft design.
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Bulten, Norbert. "Transient Blade Load Determination in behind Ship Condition based on CFD." In SNAME 14th Propeller and Shafting Symposium. SNAME, 2015. http://dx.doi.org/10.5957/pss-2015-004.

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With the aid of detailed numerical flow simulations it has become possible to determine the isolated propeller blade load during a revolution. The load fluctuation on a single propeller blade can be clearly related to the inflow velocity field. Once the time dependent load, and consequently the performance, of a single blade has been identified, knowledge can be obtained on possible overall improvement of the propeller performance. Also the impact on fatigue strength can be addressed in more detail. In this paper the propeller blade load fluctuations have been analyzed for a propeller in behind ship and in a tunnel, operating as bow thruster. The impact of the inflow to the propeller on the occurring loads will be shown. In case of tunnel thruster units, also possible actions to improve the inflow will be analyzed.
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Fromknecht, Thomas G. "Composite Technology in Couplings and Shafting for Power Transmission." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0073.

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Abstract Composite technology is growing in the power transmission industry. Composite structures of predominately carbon fibers and epoxy resins form a matrix structure for which one use is to transmit mechanical power. Of significant importance in this paper is the use of composite structures for shafting and coupling flexible elements. Filament wound composite shafting consists of winding a continuous band of the carbon fiber and epoxy resin matrix around a mandrel to obtain optimized end product characteristics. These optimized characteristics include: minimized weight with superior tensile strength when compared to steel, variable modulus of elasticity for critical speed requirements, virtually no thermal expansion of the composite shaft and corrosion resistance. The ability to modify the wind angles during the manufacture of the composite shaft permits the designer to achieve desirable system characteristics through variations in the composite matrix or laminate with negligible change in component cost or delivery. Coupling flexible elements are also manufactured from carbon fiber and epoxy resin laminates. These flexible elements take advantage of the greater tensile strength of the carbon fiber versus carbon or stainless steels to achieve a superior torque capacity within a given coupling outside diameter, or greater power density with equivalent or greater misalignment capacities. The carbon fiber and epoxy resin composite coupling flexible element embodies the desirable coupling characteristics of low deflection stiffnesses resulting in low reaction forces transmitted to the connecting equipment, with minimized possibility of fretting fatigue and significant corrosion resistance. This paper will provide an overview on the composite structure, the materials used, the filament winding process, other manufacturing processes and the application and benefits of this technology in mechanical power transmission.
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Corliss, James M., and H. Sprysl. "Measured Torsional Vibration Characteristics of a 100 Megawatt Wind Tunnel Drive Line." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8276.

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Abstract A new 100 MW (135,000 Hp) adjustable speed drive system has recently been installed in the NASA Langley National Transonic Facility. The 100 MW system is the largest of its kind in the world and consists of a salient pole synchronous motor powered by a 12-pulse Load Commutated Inverter variable frequency drive. During system commissioning the drive line torsional vibrations were measured with strain gages and a telemetry-based data acquisition system. The torque measurements included drive start-up and steady-state operation at speeds where the drive motor’s pulsating torques match the drive line’s torsional natural frequency. Rapid drive acceleration rates with short dwell times were effective in reducing torsional vibrations during drive starts. Measured peak torsional vibrations during steady-state operation were comparable to predicted values and large enough to produce noticeable lateral vibrations in the drive line shafting. Cyclic shaft stresses for all operating conditions were well within the fatigue limits of the drive line components. A comparison of the torque measurements to an analytical forced response model concluded that a 0.5% critical damping ratio was appropriately applied in the drive line’s torsional analysis.
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