A numerical investigation on the hybrid spur gears: Stress and dynamic analysis

Yılmaz, Tufan Gürkan; Doǧan, Oğuz; Karpat, Fatih

doi:10.1177/0954406220982007

Cited by 13 publications

(11 citation statements)

References 40 publications

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“…The size of the contact elements is kept at 0.1 mm to take care of the Hertzian deformation effect. 9,15 To validate the accuracy and reliability of the model, results are compared with the FE results of identical steel gear presented by Yilmaz et al 9 Figure 5(b) shows the comparison of mesh stiffness of steel gear-pair during single tooth contact, evaluated in the current study and those presented by Yilmaz et al 9 Results were in good agreement with <2% difference. Stress distribution observed over the gear teeth during single and double teeth contact in the case of steel gears is shown in Figure 6 for reference.…”

Section: Gear Dynamic Modelingmentioning

confidence: 52%

“…LaBerge et al 14 designed and manufactured a variable thickness hybrid composite gear and conducted static torsion, dynamic, and endurance experiments. Yilmaz et al 15 used the finite-element (FE) method to study the effect of rim thickness on the stress, mesh stiffness, and dynamic behavior of hybrid gears. They reported maximum shear stress on the joint region to be higher than maximum normal stress, emphasizing high shear strength adhesive bonds.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic response analysis of functionally graded gears

Singh

Mulik

Harsha

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, dynamic response analysis of functionally graded gears (FGGs) has been performed using a 6-degree of freedom dynamic model. The pinion and gear are divided into homogeneous sub-domains of uniform thickness, conforming to the gear tooth profile. The material composition varies radially according to power-law gradation with metal at the innermost and ceramic at the outermost surface. Mesh stiffness and transmission error of FGGs have been evaluated using a finite-element-based numerical method employing contact analysis. Results show that for considered values of gradient index (GI), FGGs show a 10% to 50% reduction in mesh stiffness with a 30% to 60% reduction in weight compared to steel gears of exact specifications. Also, FGGs show a 4% to 12% reduction in dynamic factor and a 9% to 17% reduction in peak-to-peak displacement amplitude than steel gears over the selected values of GI.

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Section: Gear Dynamic Modelingmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Dynamic response analysis of functionally graded gears

Singh

Mulik

Harsha

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…[44][45][46] Figure 2 depicts the definition of the backup ratio, which is expressed as the ratio of rim thickness (r) to the total tooth height (h). 6,7,49 As the backup ratio increases, the body part of the tooth grows, thus the weight. The increase in the backup ratio enhances the strength; on the contrary, its decrease provides a thinner gear body (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3] As the modern industry continues to evolve, new gear designs are expected to reduce vibration and noise and provide higher load-carrying capacity, long fatigue life, and low weight. [4][5][6][7] However, gears may produce faults due to excessive service loads, manufacturing and installation errors, insufficient lubrication, fatigue, etc., and are prone to failure. 8 During power transmission, a crack may initiate in the tooth filet region due to repetitive loads on an individual tooth of a gear pair or when the high-stress concentration occurs in an engaged tooth.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the backup ratio ( m b ) is also a significant parameter that affects the basic gear features such as load-carrying capacity and noise as well as crack propagation paths. 6,7 A great deal of research has revealed the crack path is dependent on the backup ratio. 7,10,49 Generally, the crack propagates along with the tooth when the backup ratio is greater than 1, while it propagates along the rim at low backup ratios (for instance, m b = 0.3).…”

Section: Introductionmentioning

confidence: 99%

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Influence of tooth root cracks on the mesh stiffness of asymmetric spur gear pair with different backup ratios

Doǧan

Kalay

Karpat

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Gears are critical machine elements that transmit power and motion in diverse implementation fields. Over time, gears may produce a series of faults due to harsh operating conditions, fatigue, manufacturing errors, etc., leading to severe performance degradation. During the meshing process, the stiffness of a single tooth controls the load sharing, vibration, and noise characteristics of a geared system. An undetected fault could decrease the gear stiffness and thus may lead to a fatal breakdown, substantial economic losses, or even human casualties in safety-critical applications such as helicopters, high-speed trains, and wind turbines. Hence, the accurate quantification of the gear stiffness emerges as an important research area to obtain reliable gear designs. With this in mind, the asymmetric tooth concept offers superior bending strength, fatigue propagation life, and the ability to lessen vibration over the standard (symmetric) designs in applications where unidirectional loadings are predominant. This study investigates the influence of tooth root cracks on the single-tooth and meshing stiffness characteristics of the standard and asymmetric involute spur gears. To this end, the numerical crack propagation paths obtained in our previous works were introduced to the created 3D CAD geometries. Subsequently, the single tooth stiffness of both healthy and cracked (2 5%-50%-75%-100%) gears was calculated through the ANSYS® Workbench, and the time-varying mesh stiffness was obtained. The present study evaluated the effects of backup ratio and the tooth asymmetry on the spur gears’ meshing stiffness characteristics simultaneously and further expanded the scope of the research work. The results indicated that the single tooth stiffness and mesh stiffness could be improved by 35% and 22%, respectively, as the drive side pressure angle increased from 20° to 35°. It has been noted that the gear stiffness decreased as the crack level increased, while the increment of the backup ratio further increased the reduction in the stiffness. The findings could provide significant outputs for a better understanding of the influence of tooth asymmetry on the gear dynamics characteristics, life prediction, and early fault diagnosis.

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