Noise of Involute Helical Gears

Attia, A. Y.

doi:10.1115/1.3591505

Cited by 10 publications

(6 citation statements)

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“…According to that, as long the common tooth width is imposed to be an integer multiple of the axial pitch (px), the sum of the lengths of the components (contacting generating lines) remains constant and thus torsional excitation can be avoided. This is in fact true, but subsequent research [12,13] has shown that this cannot be substantiated, since the common tooth width must be determined from different consideration, because other types of excitations are also present. Subsequent research [7,8,11] confirmed this hypothesis that significant results in reducing vibration excitation can be achieved by expedient modification of the contact zone.…”

Section: The Effect Of the Changed Contact Zone On The Length Of The Contacting Generating Linesmentioning

confidence: 99%

The effect of the contact zone of cylindrical helical gears on the meshing and some considerations for determining its shape

Drágár¹,

Kamondi²

2021

Design of Machines and Structures

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The study deals with the meshing characteristics of cylindrical helical external gear pairs. The gear pairs, following the nowaday’s strength and quality requirements are becoming ever smaller. Accuracy in the background also attracts the importance of vibration and noise reduction. The inclined tooth meshing, in contrast to the straight tooth, due to the specificity of its zone of contact, is the subject of this study. This is of special importance because the meshing stiffness varies for one to more teeth pairs, the meshing contact lines are of continuously varying length during meshing, and as a consequence load sharing and distribution is changing with. This paper deals with the zone of contact and its geometric modification in order to light on a new type of vibrational excitation.

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Section: The Effect Of the Changed Contact Zone On The Length Of The Contacting Generating Linesmentioning

confidence: 99%

The effect of the contact zone of cylindrical helical gears on the meshing and some considerations for determining its shape

Drágár¹,

Kamondi²

2021

Design of Machines and Structures

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“…The finite element/boundary element method (FEM/ BEM) is the prevailing method applied to the numerical analysis for the gearbox vibration and noise. [1][2][3] Kubur et al 4 proposed a dynamic model of a multi-shaft helical gear reduction unit formed by N flexible shafts, and studied the influence of bearing stiffness, shaft size, and other parameters on the vibration of the gearbox. Later, Wei et al 5 established the coupled nonlinear dynamics model of a wind turbine planetary gear transmission system, and proposed a lightweight and reliability constrained optimization design method according to the sequential quadratic programming algorithm.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of gearbox based on panel acoustic participation and response surface methodology

Zhou

2022

Journal of Low Frequency Noise, Vibration and Active Control

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Aiming at noise problem of two-stage gearbox, this paper uses the panel acoustic contribution analysis (PACA) and response surface methodology to conduct structural-borne acoustics analysis and multi-objective optimization of gearbox. Using this optimization, optimal layout and parameters of the added ribs can be determined. The dynamic model of a spur gear-shaft-bearing system is built in consideration of the time-varying mesh stiffness, the time-varying bearing stiffness, and the flexibility of the shaft, while dynamic load of the bearing is obtained through solving the model. The dynamic load of bearings is considered as excitation to analyze the vibration and noise radiation characteristics of housing. Furthermore, acoustic transfer vector, modal acoustic contribution and PACA are used to select the region with the most acoustic contribution. The variable ribs structure model (VRSM) is established in this region. Finally, the VRSM are adopted to optimize the housing. The optimization model based on the peak sound pressure level (PSPL) and the ribs mass (Rm) is established by using response surface method. Through multi-objective optimization, the variable in VRSM can be modified or deleted to reduce the radiated noise of the gearbox. The optimization results demonstrate that the PSPL after optimization is decreased by 4.88 dB at frequency of 3130 Hz. At the same mass, the noise reduction effect of VRSM is 12% higher than that of standard rib. Therefore, the optimization effect of the housing structure is obvious. PACA-VRSM-RSM- NSGA-II technology provides a new research scheme for reducing the vibration and noise of the gearbox.

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“…In the early research on gear noise, many empirical formulas for estimating noise intensity were obtained through experiments. [16][17][18] However, the shape of the housing is one of the main factors in the radiated noise of the gearbox, so these empirical formulas may not be suitable for other gearboxes because the radiated noise is strongly dependent on the shape of the housing. Subsequently, the vibration and noise of gearbox is mainly studied by numerical simulation, among which the finite element method/boundary element method (FEM/BEM) is the most widely used.…”

Section: Introductionmentioning

confidence: 99%

Vibro-acoustic characteristics of gear-rotor-bearing coupled system under multi-source excitation

Wang

Zhou

Adayi

2022

Journal of Low Frequency Noise, Vibration and Active Control

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With the development of machinery toward high speed, high power, and high reliability, the vibration and noise problems of gearboxes become more prominent. The vibro-acoustic characteristics of gear-rotor-bearing coupled system are difficult to be characterized by the simple gear transmission system. This paper concentrated on modeling an improved dynamic model of gear-rotor-bearing system under multi-source excitation. The initial bending of shaft, precession effect, and gear eccentricity were included in the model to calculate the dynamic response. An extended computational method for predicting the radiation noise of a gearbox was developed. The distribution of the sound pressure around the gearbox was obtained by combining the finite element vibration analysis and boundary element noise analysis. Experimental vibration and noise measurements from a simplified gearbox confirmed the simulation results. The influences of precession effect on dynamic response and radiated noise of the gearbox were investigated. Results show that with the increase of input speed, the peak speeds of the system dynamic load increase and the resonance region shifts. The resonance regions of each field point of the gearbox are enlarged, and the noise is enhanced obviously. The results provide a theoretical basis for the further development of high-quality silent gearboxes.

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Noise of Involute Helical Gears

Cited by 10 publications

References 0 publications

The effect of the contact zone of cylindrical helical gears on the meshing and some considerations for determining its shape

The effect of the contact zone of cylindrical helical gears on the meshing and some considerations for determining its shape

Multi-objective optimization of gearbox based on panel acoustic participation and response surface methodology

Vibro-acoustic characteristics of gear-rotor-bearing coupled system under multi-source excitation

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