Optimal Sizing of Composite Power Transmission Shafting

Lim, Joon W.; Darlow, Mark S.

doi:10.4050/jahs.31.75

Cited by 23 publications

(18 citation statements)

References 2 publications

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“…Obtained displacement and force signals were filtered and the plot between them gives a force-displacement curve, which is in the form of the hysteresis loop. From the hysteresis loop, the damping factor has been estimated as explained earlier using Equation (4). The estimated damping factor is plotted over the shaft speed as shown in Figure 12.…”

Section: Estimation Of Damping For the Static Casementioning

confidence: 99%

Dynamic analysis of shafts of composite materials

Alwan

Gupta

Sekhar

et al. 2010

Journal of Reinforced Plastics and Composites

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The objective of this study is to analyze the dynamic behavior of composite shafts with particular interest on estimation of damping. The composite shafts have been chosen as potential candidates for the replacement of conventional metallic shafts in many applications. This study analyzed the dynamic behavior of different materials such as glass/epoxy, carbon/epoxy, and boron/epoxy at different speeds. Detailed dynamic studies on the effect of different materials, stacking sequences on the unbalance responses, and eigenfrequencies are required, particularly with respect to the damping present in the composite material. Different methodologies such as logarithmic decay curve, half-power method, and hysteresis loop method using force sensors have been used for determining the damping of the composite shafts. Composite tube-shafts and solid shafts have been modeled and analyzed using ANSYS. A parametric study has been carried out to analyze the effect of stacking sequence on eigenfrequencies of composite tube-shafts. This study aims to have a comprehensive view of numerical and experimental analyses of composite shafts for eigenvalues, damping estimation, and unbalance response. Eigenfrequencies of composite tube-shafts and solid shafts were estimated through modal testing and are compared with analytical and FEM results. In this study, torsional vibration analysis for composite solid shafts has also been carried out using the rotational laser vibrometer.

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Section: Estimation Of Damping For the Static Casementioning

confidence: 99%

Dynamic analysis of shafts of composite materials

Alwan

Gupta

Sekhar

et al. 2010

Journal of Reinforced Plastics and Composites

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show abstract

“…There have been very few works reported on composite shafts even though, Zinberg and Symmonds [10] studied these way back. Some more works include those of Henrique dos et al [11], Singh and Gupta [12,13], Wettergren [14] and Lim and Darlow [15]. Very recently, Sekhar and Ravi Kumar [16] based on the "rst order shear deformation theory VIBRATIONS OF SLOTTED SHAFTS using "nite element method analyzed the dynamic aspects of composite shafts for di!erent materials and "bre orientations.…”

Section: Modelling Of Composite Slotted Shaftmentioning

confidence: 99%

Vibration Characteristics of Slotted Shafts

Sekhar

Srinivas

2002

Journal of Sound and Vibration

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“…Torsional vibrations are computed using classical methods with the relations presented by Lim and Darlow [3]:…”

Section: Torsional Vibration Analysismentioning

confidence: 99%

Optimisation of hybrid high-modulus/high-strength carbon fibre reinforced plastic composite drive shafts

Montagnier

Hochard²

2013

Materials & Design (1980-2015)

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This study deals with the optimisation of hybrid composite drive shafts operating at subcritical or supercritical speeds, using a genetic algorithm. A formulation for the flexural vibrations of a composite drive shaft mounted on viscoelastic supports including shear effects is developed. In particular, an analytic stability criterion is developed to ensure the integrity of the system in the supercritical regime. Then it is shown that the torsional strength can be computed with the maximum stress criterion. A shell method is developed for computing drive shaft torsional buckling. The optimisation of a helicopter tail rotor driveline is then performed. In particular, original hybrid shafts consisting of high-modulus and high-strength carbon fibre reinforced epoxy plies were studied. The solutions obtained using the method presented here made it possible to greatly decrease the number of shafts and the weight of the driveline under subcritical conditions, and even more under supercritical conditions. This study yielded some general rules for designing an optimum composite shaft without any need for optimisation algorithms.

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Optimal Sizing of Composite Power Transmission Shafting

Cited by 23 publications

References 2 publications

Dynamic analysis of shafts of composite materials

Dynamic analysis of shafts of composite materials

Vibration Characteristics of Slotted Shafts

Optimisation of hybrid high-modulus/high-strength carbon fibre reinforced plastic composite drive shafts

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