Abstract
This investigation comprehensively compared the elastic contact and the modified stiff impact models, aiming for the backlash-induced nonlinear vibro-impact gear rattle under lightly loaded conditions. Three meshing force models in backlash are incorporated into the elastic model independently. Unlike the previous uncoupled stiff impact model, the modified impact model employed in this paper considers the coupling between the pinion and gearwheel. Three scenarios were investigated with different components of two internal excitations, static transmission error-induced periodical backlash and the time-varying meshing stiffness. The numerical results show that the free and forced gear motion, nonlinear characteristics and rattle severity are significantly affected by static transmission error rather than time-varying meshing stiffness. Two studied hydrodynamic lubricant models show different damping effects throughout the free vibration response. The forced gear motion and rattle sensitivities show a noticeable difference below 40 rad/s2 and turn to a slight variation above 60rad/s2. The high excitation level taking over the backlash determines the dynamic characteristics more deterministically than the internal excitations. Finally, the hydrodynamic lubricant model containing only the oil squeeze effect will likely match the experimental results obtained from the dedicated rattle test bench under several conditions. The experimentally detected components of the static transmission error on the gearwheel suggest that an acceptable model should be considered in the gear rattle model.
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Data availability statement
The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ATol:
-
Absolute tolerance
- DSI:
-
Double-side impact
- EHL:
-
Elastohydrodynamic lubricant
- FFT:
-
Fast Fourier transform
- GDA:
-
KLINGELNBERG gear deviation analysis
- HDL:
-
Hydrodynamic lubricant
- ICE:
-
Internal combustion engine
- ICEFS:
-
Internal combustion engine function simulation
- LOA:
-
Line of action
- MEBDF:
-
Modified extended backward differentiation formulas
- NI:
-
No impact
- R Tol :
-
Relative tolerance
- SSI:
-
Single-side impact
- TVMS:
-
Time-varying meshing stiffness
- a :
-
Half-length of the oil film
- A e :
-
Excitation level, rad/s2
- b:
-
Nominal half gear backlash
- c :
-
Contact damping
- f :
-
Frequency, Hz
- F :
-
Gear meshing force
- h a :
-
Gear addendum height
- h c :
-
Centre oil film thickness
- \({i_g}\) :
-
Gear ratio
- j :
-
Periodical backlash
- J :
-
Moment of inertia of gear
- k :
-
Stiffness, N/m
- l :
-
Harmonic number of Fourier series
- L r :
-
Rattle severity index, dB
- m :
-
Gear equivalent mass, kg
- m n :
-
Gear normal module, mm
- M a :
-
Alternative torque, Nm
- M DT :
-
Drag torque, Nm
- M e :
-
Dynamic torque, Nm
- M m :
-
Mean torque, Nm
- n :
-
Rotational speed, rpm
- r :
-
Curvature radius at contact point
- r c :
-
Coefficient of restitution
- R :
-
Gear geometry radius
- R a :
-
Roughness
- t :
-
Time
- V ent :
-
Fluid entraining velocity
- x :
-
Relative displacement
- z:
-
Number of teeth
- Z:
-
Common axial face width of a gear pair
- \( {\alpha_n}\) :
-
Gear normal pressure angle, deg
- \(\beta \) :
-
Gear helix angle, deg
- \(\xi \) :
-
Damping ratio
- \(\rho \) :
-
Density
- \(\mu \) :
-
Dynamic viscosity
- \(\tilde e\) :
-
Static transmission error
- \(\theta \) :
-
Rotational displacement
- \(\delta \) :
-
Feigenbaum’s value
- bp :
-
Pinion base circle
- bw :
-
Gearwheel base circle
- c :
-
Gear teeth contact
- e :
-
Excitation
- e q :
-
Equivalent
- HRa :
-
Rahnejat, H. HDL model
- g :
-
Gear meshing
- r :
-
Pinion shaft rotation
- s :
-
Teeth separation
- sa :
-
Sampling
- stf :
-
Modified stiff impact
- p :
-
Pinion
- pp :
-
Pinion pitch circle
- pw :
-
Gearwheel pitch circle
- RBr :
-
Brancati, R. HDL model
- w :
-
Gearwheel
- . :
-
First-time derivation
- .. :
-
Second-time derivation
- - :
-
Mean value
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Acknowledgements
The authors would like to thank MAGNA PT Powertrain (Jiangxi) for the rattle experiments on the test bench and the gear data measurements.
Funding
This project was supported by the National Natural Science Foundation of China (Grant No. 51975080), China Scholarship Council (Grant No. 202106050063) and Jiangxi Province Key Development Project (Grant No. 20202BBE53007).
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Zhou, Y., Shi, X., Guo, D. et al. Nonlinear dynamic behaviour and severity of lightly loaded gear rattle under different vibro-impact models and internal excitations. Nonlinear Dyn 112, 961–993 (2024). https://doi.org/10.1007/s11071-023-09113-2
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DOI: https://doi.org/10.1007/s11071-023-09113-2