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[ subject:"Mechanical engineering." ]
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Dynamic wear models for gear systems.
~
Ding, Huali.
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Dynamic wear models for gear systems.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Dynamic wear models for gear systems./
作者:
Ding, Huali.
面頁冊數:
242 p.
附註:
Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6908.
Contained By:
Dissertation Abstracts International68-10B.
標題:
Mechanical engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3286758
ISBN:
9780549299271
Dynamic wear models for gear systems.
Ding, Huali.
Dynamic wear models for gear systems.
- 242 p.
Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6908.
Thesis (Ph.D.)--The Ohio State University, 2007.
This item must not be sold to any third party vendors.
Gears are one of the critical components used for power and motion transmission systems. They are expected to operate reliably under complex duty cycles defined by wide ranges of speed and torque, making the dynamic response of gears a major concern due to the reasons of gear noise and durability. Gear mesh forces under dynamic conditions become larger, increasing gear noise levels while accelerating the occurrence of failure modes such as contact and bending fatigue and surface wear. Excessive wear is characterized by loss of tooth profile and thickness, which might result in higher dynamic gear mesh and tooth forces, as a consequence, shorter contact and tooth bending fatigue lives. Surface wear changes not only the contact pattern and load distribution, but also the vibration and noise characteristics of the gear system significantly. Under dynamic conditions, gear tooth forces are different from the quasi-static forces in both magnitude and shape. Therefore, surface wear outcome that is strongly related to the contact stresses should be highly dependent on the dynamic behavior. On the other hand, the dynamic response of a geared system is very sensitive to tooth surface profile deviations in the form of surface wear. This is the primary reason for many real-life gear systems to become noisier after years of operation. All these arguments suggest that gear dynamics and gear wear are mutually dependent on each other. This study aims at investigating the interactions between surface wear and dynamic behavior of gear systems.
ISBN: 9780549299271Subjects--Topical Terms:
649730
Mechanical engineering.
Dynamic wear models for gear systems.
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Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6908.
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Adviser: Ahmet Kahraman.
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Thesis (Ph.D.)--The Ohio State University, 2007.
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Gears are one of the critical components used for power and motion transmission systems. They are expected to operate reliably under complex duty cycles defined by wide ranges of speed and torque, making the dynamic response of gears a major concern due to the reasons of gear noise and durability. Gear mesh forces under dynamic conditions become larger, increasing gear noise levels while accelerating the occurrence of failure modes such as contact and bending fatigue and surface wear. Excessive wear is characterized by loss of tooth profile and thickness, which might result in higher dynamic gear mesh and tooth forces, as a consequence, shorter contact and tooth bending fatigue lives. Surface wear changes not only the contact pattern and load distribution, but also the vibration and noise characteristics of the gear system significantly. Under dynamic conditions, gear tooth forces are different from the quasi-static forces in both magnitude and shape. Therefore, surface wear outcome that is strongly related to the contact stresses should be highly dependent on the dynamic behavior. On the other hand, the dynamic response of a geared system is very sensitive to tooth surface profile deviations in the form of surface wear. This is the primary reason for many real-life gear systems to become noisier after years of operation. All these arguments suggest that gear dynamics and gear wear are mutually dependent on each other. This study aims at investigating the interactions between surface wear and dynamic behavior of gear systems.
520
$a
In this study, a family of dynamic models of gear systems were incorporated with a generalized wear formulation to predict the interactions between the dynamic behavior and tooth surface wear. First, as the most basic gear system, dynamic response of a spur gear pair was predicted by using a finite elements-based deformable-body model and a simplified discrete model. The dynamic models were validated through comparisons to gear dynamics experiments. These validated dynamic models were then combined with a surface wear model based on Archard's wear formulation to study the interaction between gear surface wear and gear dynamic response. The predictions of the dynamic gear wear model demonstrated a considerable influence of worn surface profiles on dynamic tooth forces and transmission error as well as a significant influence of dynamic tooth forces on wear profiles. The nonlinear behavior of the gear pair was also impacted by surface wear drastically. A set of actual spur gear wear experiments was performed to generate experimental wear profiles that were shown to agree well with the predictions of the spur gear dynamic wear model.
520
$a
Next, the same dynamic wear methodology was applied to helical gears, by replacing the torsional nonlinear spur gear wear model with a three-dimensional linear model. The dynamic model was validated by comparisons to published experimental data. Surface wear was shown to influence the dynamic response of a helical gear pair substantially, including the natural frequencies and forced response harmonic amplitudes. Consequences of dynamic behavior on wear outcome from a helical gear pair were less prominent, especially when compared to spur gears.
520
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Finally, suitability of these gear pair dynamic wear models to a multi-mesh gear system was established by considering a single stage n-planet planetary gear set. A nonlinear time-varying dynamic model of a planetary gear set was used for this purpose. The predictions indicated that the wear depths at the both internal and external meshes are significant and hence must be included in the simulations simultaneously. Both the number of planets and kinematic configurations influence the wear distributions considerably due to the changes in load and relative wear cycles. As in single gear pairs, surface wear was shown to impact the harmonic amplitudes of the dynamic response parameters, at the same time influencing the nonlinear behavior as well. Dynamic loads were also shown to affect the wear profiles at all meshes of a planetary gear set significantly. Higher wear amplitudes were predicted in the resonance region due to the increased dynamic mesh loads.
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