Numerical Investigation on Influence Factors of Radiation Noise of the Bridge Crane Helical Gear Reducer

2017 ◽  
Author(s):  
Wen Liu ◽  
Biao Gao ◽  
Teng-jiao Lin ◽  
Jin-hong Zhang
Keyword(s):  
Dynamic Response ◽  
Sound Pressure ◽  
Element Model ◽  
Simulation Method ◽  
Helix Angle ◽  
Helical Gear ◽  
Internal Dynamic ◽  
Bridge Crane ◽  
Gear Pair ◽  
Radiated Noise

In this paper, the internal dynamic excitation of the gear pair in a helical gear reducer of bridge crane is numerically investigated, taking into account of time-varying mesh stiffness, comprehensive gear error and meshing shock. The integral finite element model of bridge crane reducer gearbox is built by ANSYS software using APDL language. The internal dynamic excitations are imposed on the contact line of gear pair to solve the dynamic response of the gearbox. Using the results of dynamic response as boundary excitation conditions, the acoustic boundary element model is established. The surface sound pressure of gearbox and the radiated noise of field points are solved with SYSNOISE software. In order to verify the feasibility of the simulation method, a vibration & noise test is carried out. With the constant center distance as well as the similar total transmission ratio, the surface sound pressure of gearbox and the radiated noise of field points are calculated with different modules and helix angles. The effects of module and helix angle on the noise radiation of the gearbox are analyzed and discussed. The results provide a useful theoretical guidance for the design of gearboxes.

Vibration-based fault diagnosis of helical gear pair with tooth surface wear considering time-varying friction coefficient under mixed EHL condition

2021 ◽  
pp. 1-16
Author(s):  
Siyu Wang ◽  
Rupeng Zhu
Keyword(s):  
Dynamic Response ◽  
Hydrodynamic Lubrication ◽  
Helical Gear ◽  
Calculation Model ◽  
Tooth Surface ◽  
Time Varying ◽  
Gear Pair ◽  
Surface Wear ◽  
Mesh Stiffness ◽  
Helical Gear Pair

Abstract Based on “slice method”, the improved time-varying mesh stiffness (TVMS) calculation model of helical gear pair with tooth surface wear is proposed, in which the effect of friction force that obtained under mixed elasto-hydrodynamic lubrication (EHL) is considered in the model. Based on the improved TVMS calculation model, the dynamic model of helical gear system is established, then the influence of tooth wear parameters on the dynamic response is studied. The results illustrate that the varying reduction extents of mesh stiffness along tooth profile under tooth surface wear, in addition, the dynamic response in time-domain and frequency-domain present significant decline in amplitude under deteriorating wear condition.

Tooth Root Stresses of Helical Gear Pairs With Unequal and Offset Face Widths

2011 ◽  
Author(s):  
Carlos H. Wink
Keyword(s):  
Load Distribution ◽  
Element Model ◽  
Helical Gear ◽  
The Other ◽  
Gear Pair ◽  
Tooth Root ◽  
Pair Member ◽  
Face Width ◽  
The Face ◽  
Root Stress

In this study, tooth root stresses of helical gear pairs with different combinations of face width increase and offsets were analyzed. Contact face width was kept constant. The variables studied were face width and gear faces offset. The well-known LDP – Load Distribution Program was used to calculate tooth root stresses using a finite element model. The results presented show that the face width increase and offset have a significant influence on tooth root stresses. In some cases, increasing face width of one gear pair member resulted in significant increase of tooth root stress of the other member. For gear pairs with unequal and offset face widths, tooth root stresses were mostly affected when face widths were increased to the same direction of the contact line travel direction.

A Helical Gear Pair Pocketing Power Loss Model

2013 ◽  
Author(s):  
David Talbot ◽  
Ahmet Kahraman ◽  
Satya Seetharaman
Keyword(s):  
Fluid Dynamics ◽  
Power Loss ◽  
Control Volume ◽  
Fluid Pressure ◽  
Helix Angle ◽  
Helical Gear ◽  
Gear Pair ◽  
Dynamics Model ◽  
Gear Mesh ◽  
Helical Gear Pair

A new fluid dynamics model is proposed to predict the power losses due to pocketing of air, oil, or an air-oil mixture in the helical gear meshes. The proposed computational procedure treats a helical gear pair as combination of a number of narrow face width spur gear segments staggered according to the helix angle and forms a discrete, fluid dynamics model of the medium being pocketed in the gear mesh. Continuity and conservation of momentum equations are applied to each coupled control volume filled with a compressible fluid mixture to predict fluid pressure and velocity distributions from, which the instantaneous pocketing power loss is calculated. The proposed model is exercised in order to investigate fluid pressure and velocity distributions in time, as well as pocketing power loss as a function of speed, helix angle and oil-to-air ratio.

CAE Technology Applied to Range Hood’s Noise Control and Optimization Design

2011 ◽  
Vol 338 ◽  
pp. 543-546
Author(s):  
Hu Yu ◽  
Hong Hou ◽  
Liang Sun
Keyword(s):  
Sound Pressure Level ◽  
Optimization Design ◽  
Sound Pressure ◽  
Element Model ◽  
Pressure Level ◽  
Sound Power ◽  
Radiated Noise ◽  
Radiated Sound ◽  
Cae Technology ◽  
Radiated Sound Power

In this study we use the CAE technology to compute and reduce the radiated noise of range hood. First, a finite element model of a typical range hood is created using Hypermesh. Then, the surface particle velocity is carried out in Nastran, and the radiated noise is calculated by Sysnoise. Finally, the DOE-based structural optimization is preformed using iSIGHT-FD, in which the sound pressure level at four sensitive points and the radiated sound power are selected as the objective function and the thickness of four panels are adopted as design variable. In addition, the weight of the range hood as a constraint is kept no more than its original weight. As a result, a maximum radiated sound power reduction of 3.66W and a maximum sound pressure level reduction of 4.7 dB are successfully achieved. It shows the CAE technology is a very efficient and effective method for reducing radiated noise.

Utilization of Tooth Contact Pattern in a Gear Meshing Model for Estimation of Sliding Loss in a Parallel-Axis Gear Pair

2014 ◽  
Vol 619 ◽  
pp. 68-72
Author(s):  
Jetsada Phraeknanthoe ◽  
Natcha Ponchai ◽  
Chanat Ratanasumawong
Keyword(s):  
Helix Angle ◽  
Helical Gear ◽  
Experimental Results ◽  
Gear Pair ◽  
Contact Pattern ◽  
Tooth Contact ◽  
Parallel Axis ◽  
Helical Gear Pair

The utilization of tooth contact pattern in a gear meshing model for estimation of sliding loss in a spur and helical gear pair is presented in this paper. The photo of tooth contact pattern taken after the gear operation is used as the database to generate the simplified tooth contact pattern. Then the simplified contact pattern is used along with the gear meshing model to estimate the sliding loss of a gear pair. Experiments are done to verify the results. The estimated results from the presented method agree well with the experimental results. The presented method is able to estimate the effect of the helix angle on the sliding loss correctly whereas the estimation without using the data of tooth contact pattern cannot.

scholarly journals Simulation and Experimental Validation of Sound Field in a Rotating Tire Cavity Arising from Acoustic Cavity Resonance

2021 ◽  
Vol 11 (3) ◽  
pp. 1121
Author(s):  
Xiaojun Hu ◽  
Xiandong Liu ◽  
Yingchun Shan ◽  
Tian He
Keyword(s):  
Sound Pressure ◽  
Influence Factors ◽  
Sound Field ◽  
Element Model ◽  
Simulation Method ◽  
Cavity Resonance ◽  
Rotating Speed ◽  
Automobile Tire ◽  
Acoustic Cavity ◽  
Simplified Finite Element Model

As we all know, the tire acoustic cavity resonance noise (TACRN) can cause irritating noise in a vehicle, but it is evidently difficult to be weakened. To obtain accurately the characteristics of TACRN is a key step of attenuating TACRN. In this paper, a simulation method, in which a simplified finite element model of automobile tire with acoustic cavity introducing the rotation of automobile tire is established, is proposed to gain the sound field in the cavity of a rotating automobile tire. And the test of sound pressure in a rotating tire is also performed to validate the proposed simulation method. The comparisons between the simulation and experimental consequences show a satisfying conclusion. Furthermore, the influence factors of the rotating speed, the inflation pressure of the tire and the load on the sound field of automobile tire acoustic cavity are calculated and analyzed.

Effect of Axial Vibrations on the Dynamics of a Helical Gear Pair

1993 ◽  
Vol 115 (1) ◽  
pp. 33-39 ◽  
Author(s):  
A. Kahraman
Keyword(s):  
Natural Frequencies ◽  
Helix Angle ◽  
Transmission Error ◽  
Helical Gear ◽  
Forced Response ◽  
Dynamic Mesh ◽  
Gear Pair ◽  
Gear Mesh ◽  
Static Transmission Error ◽  
Helical Gear Pair

In this paper, a linear dynamic model of a helical gear pair has been developed. The model accounts for the shaft and bearing flexibilities, and the dynamic coupling among the transverse, torsional, axial and rotational (rocking) motions due to the gear mesh. The natural frequencies and the mode shapes have been predicted, and the modes which are excited by the static transmission error have been identified. The forced response due to the static transmission error has also been predicted, including the dynamic mesh and bearing forces. A parametric study has been performed to investigate the effect of the helix angle on the free and forced vibrational characteristics of the gear pair. It has been shown that the helix angle can be neglected in predicting the natural frequencies and the dynamic mesh forces. An accurate prediction of dynamic bearing forces and moments requires inclusion of the helix angle in the analysis.

scholarly journals Time-varying dynamic analysis for a helical gear pair system with three-dimensional motion due to bearing deformation

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402091812
Author(s):  
Ying-Chung Chen
Keyword(s):  
Three Dimensional ◽  
Helix Angle ◽  
Helical Gear ◽  
Dynamic Responses ◽  
Time Varying ◽  
Gear Pair ◽  
Contact Ratio ◽  
Transverse Pressure ◽  
Helical Gear Pair ◽  
Center Distance

The dynamic response of a helical gear pair system is investigated. A new dynamic model for a helical gear pair system, considering three-dimensional motion due to bearing deformation, is proposed. The proposed model considers the helix angle, gear pair center distance, transverse pressure angle, and the contact ratio as time-dependent variables, which are considered as constants in other models. In fact, three-dimensional motion due to bearing deformation will lead to the changes in a series of dynamic responses. The system equations of motion were obtained by applying Lagrange’s equation and the dynamic responses are computed by the fourth-order Runge–Kutta method. The time-varying dynamic displacements, helix angle, gear pair center distance, transverse pressure angle, and the contact ratio are investigated with bearing deformation, different radial bear stiffness, different axial bear stiffness, and gear eccentricity. The results show that, due to the time-varying effect, this new helical gear pair model provides more accurate dynamic responses than those previous models which are considered as constant. In the future, this study can provide some useful information for the time-varying dynamic design of a helical gear pair system.

Investigations on the vibrational and acoustic characteristics of a submarine-like system by experiments and simulations

2017 ◽  
Vol 233 (1) ◽  
pp. 3-13
Author(s):  
Jian Wang ◽  
Haosen Yang ◽  
Hongxing Hua
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Finite Element Model ◽  
Sound Pressure ◽  
Natural Frequencies ◽  
Element Model ◽  
Acoustic Characteristics ◽  
Comparison Results ◽  
Hull Structure ◽  
Radiated Sound

An experimental study aiming at investigating the vibrational and acoustic characteristics of a submarine-like system is implemented in this article. For comparison purpose, a finite element model is used to calculate the dynamic behaviors and sound radiation of the system. With consideration of the interaction between the shaft and hull structure, the dynamic response and the radiated sound pressure of the system are presented. Associated with the finite element model, the modes that correspond to the main peaks in the radiated sound pressure are identified. The results indicate that the forces transmitted to the hull could be amplified at the natural frequencies of the shaft, and a relative high radiated sound pressure level can be observed if the hull is also resonating simultaneously. Due to the non-uniformity of the structure and external excitation, the bending modes ( n = 1) and the longitudinal modes ( n = 0) are coupled with each other and result in a more complex dynamic response of the system. Moreover, considering the foundation is critical to supporting the axial force transmitted from the propeller, and a lower foundation model is constructed to investigate its influence on the acoustic response of the system. The comparison results show that lower foundation would lead to a rise of the natural frequency of the mode that relates to the axial impedance of the foundation. And, a slight decrease in the radiated sound pressure can be achieved in the frequency range below these natural frequencies.

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