Influence of Tip Relief Modification on the Wear of Spur Gears with Asymmetric Teeth

Advances in Mechanical Engineering

Doǧan

Yüce

et al. 2017

Self Cite

Gears are one of the most crucial parts of power transmission systems in various industrial applications. Recently, there emerged a need to design gear drivers due to the rising performance requirements of various power transmission applications, such as higher load-carrying capacity, higher strength, longer working life, lower cost, and higher velocity. Due to their excellent properties, gears with asymmetric teeth have been designed to obtain better performance in applications. As the rotation speed of the gear transmission increases, the dynamic behavior of the gears has become a subject of growing interest. The most important contributing factor of dynamic behavior is the stiffness of the teeth, which changes constantly throughout the operation. The calculation of gear stiffness is important for determining the load distribution between the gear teeth when two sets of teeth are in contact. The primary objective of this article is to develop a new approach to calculate gear mesh stiffness for asymmetric gears. With this aim in mind, single tooth stiffness was calculated in the first stage of the study using a finite element method. This study presents crucial results to gear researchers for understanding spur gears with involute asymmetric teeth, and the results will provide researchers with input data for dynamic analysis.

Section: Introductionmentioning

confidence: 99%

An improved numerical method for the mesh stiffness calculation of spur gears with asymmetric teeth on dynamic load analysis

Advances in Mechanical Engineering

Doǧan

Yüce

et al. 2017

Self Cite

“…ISO 6336 and DIN 3990), analytical methods (e.g. the Direct Gear Design method and the tooth contact analysis), and numerical methods (Finite elements method-FEM) have been used to compare the performance of conventional and asymmetric gears under same conditions [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In order to utilize asymmetric gear designs more effecttively, it is imperative to perform analyses of these gears under dynamic loading. In some studies [19][20][21][22], preliminary results related on the response of asymmetric gears under dynamic loading are presesented. The effect of some design parameters, such as pressure angle or tooth height on dynamic loads, was shown.…”

Section: Introductionmentioning

confidence: 99%

A Computer Program for Dynamic Load Simulation of Spur Gears with Asymmetric and Symmetric Teeth

Ekwaro-Osire

2012

WJM

Self Cite

An important concern in gear design is to reduce the dynamic load and noise of gear systems. It has been found that the noise generated from gearing is basically due to gearbox vibration excited by the dynamic load. Since one of the situations that demand high performance is the high rotational speeds, there is a need to understand the dynamic behavior of the gears at such speeds. Such knowledge would shed light on detrimental characteristics like dynamic loads and vibrations. An efficient way in performing studies on the dynamic behavior of gears is using computer aided analysis on numerical models. In this paper, a developed computer program is introduced to analyze dynamic behavior of spur gears with asymmetric teeth that have a potential use for higher performance in wind turbine gearboxes. This program can be used to compare conventional spur gears with symmetric teeth and spur gears with asymmetric teeth. By using this program, gear designers can design a gear pair and obtain results, e.g dynamic Load, transmitted torque, static transmission error, and frequency spectra of static transmission error etc., just by pressing a command button

ISRN Mechanical Engineering

“…One of the advanced fault identification procedures commonly used is the condition-based vibration signature analysis [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Acquired machine vibration/acoustic signals are compared with ones obtained from the healthy machines allowing the detection of component abnormalities from the signals.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional signature analysis procedures using both time signal and frequency analysis [1][2][3][4] showed considerable success using the zero-order figure of merit (FM0) technique by detecting relative vibration level change to the variations of particular frequency energy in the transmission system. Others use time and frequency method combined with statistical approach [5][6][7][8][9][10], which provides very good comparisons in between present and past vibrations and a definite indication for damages in the system. In addition, the use of joint time-frequency domain methods based on the Wigner-Ville Distribution (WVD) as well as the Continuous Wavelet Transform (CWT) [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] have also been applied extensively to detect gear and bearing failures in transmission systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration Signature Analysis and Parameter Extractions on Damages in Gears and Rolling Element Bearings

Shen

Wen

Arunyanart

et al. 2011

This paper is to analyze and identify damage in gear teeth and rolling element bearings by establishing pattern feature parameters from vibration signatures. In the present work, different damage scenarios involving different combinations of gear tooth damage, bearing damage are considered. Each of the damage scenarios are studied and compared in the time domain, the frequency domain, and the joint time-frequency domain using the FM0 technique, the Fourier Transform, the Wigner-Ville Transform, and the Continuous Wavelet Transform, respectively. Results obtained from the three different signal domains are analyzed to develop indicative parameters and visual presentations that measure the integrity and wellness of the bearing and gear components. The joint time-frequency domain obtained from the continuous wavelet transform has shown to be a superior technique for providing clear visual examination solution for different types of component damages as well as for feature extractions used for computerbased machine health monitoring solution.