Abstract
The mesh phasing angle is an important influencing factor in a gear dynamic system. However, previous studies of mesh phasing in a multi-stage gear system ignore the coupling effects of coaxial teeth ratio. Therefore, this paper derives the coupling relationship between mesh phasing angle and coaxial teeth ratio in a multi-stage gear system. The dynamic model for a two-stage parallel shaft gear train with time-varying mesh stiffness is established. The phase relationship is validated by rigid-flexible coupling model. Through the derived coupling relationship, it is found that the coaxial teeth ratio reduces the periodic variation range of mesh phasing. When the coaxial teeth ratio is not equal to 1, the effect of mesh phasing on the nonlinear vibration response of the system is investigated, and the suppression effect on the system vibration is found. The influence of mesh phasing on the chaotic motion of the system is analyzed in detail. The effect of mesh phasing on the vibration characteristics is compared for different coaxial teeth ratio. Finally, the change law of system vibration is revealed under the interaction of coaxial teeth ratio and mesh phasing, which provides a reference for the dynamic design of a multi-stage gear system.
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Abbreviations
- \(J_{i} \left( {i = 1,2,3,4} \right)\) :
-
Inertia of the i gear
- \(z_{i} \left( {i = {1},{2},{3},{4}} \right)\) :
-
Teeth number of the i gear
- \({\text{To}}_{i} \left( {i = {1},{2}} \right)\) :
-
Input and output torque
- \(k_{i} (t)\left( {i = {1},{2}} \right)\) :
-
Time-varying mesh stiffness of the i stage
- \(k_{12} (t),k_{12}^{\prime } (t)\) :
-
The coupling stiffness of the first and second stages
- \(k_{{i{\text{m}}}} \left( {i = {1},{2}} \right)\) :
-
Mean value of the time-varying mesh stiffness of the i stage
- \(k_{h} ,k_{{\text{f}}}\) :
-
Contact stiffness, fillet-foundation stiffness
- \(k_{{\text{b}}} ,k_{{\text{s}}} ,k_{{\text{a}}}\) :
-
Bending stiffness, shear stiffness and axial compressive stiffness
- \(k_{e}\) :
-
Mesh stiffness
- \(c_{i} \left( {i = {1},{2}} \right)\) :
-
Mesh damping of the i stage
- \(b_{i} \left( {i = {1},{2}} \right)\) :
-
Nonlinear backlash of the i stage
- \(u_{i} \left( {i = 1,2} \right)\) :
-
Dynamic transmission error of the i stage
- \(q_{i} \left( {i = 1,2} \right)\) :
-
Dimensionless dynamic transmission error of the i stage
- \(\tau\) :
-
Dimensionless time
- \(b_{n}\) :
-
System characteristic length
- \(\omega_{n}\) :
-
System characteristic frequency
- \(\omega_{ij} \left( {i = 1,2;j = 1,2} \right)\) :
-
Dimensionless characteristic frequency
- \(F_{i} \left( {i = 1,2} \right)\) :
-
Dimensionless input and output load force
- \(e_{i} \left( {i = 1,2} \right)\) :
-
Dimensionless static transmission error of the i stage
- \(\alpha\) :
-
Pressure angle
- \(\beta\) :
-
Operating pressure angle
- \(\theta_{f}\) :
-
Angle between the tooth center-line and the junction with the root circle
- \(u_{fi} \left( {i = 1,2} \right)\) :
-
Distance along the tooth centerline measured from the tooth root to the loading tooth section
- \(S_{f}\) :
-
Tooth root thickness
- \(r_{f}\) :
-
Root circle radius
- \(r_{in}\) :
-
Hub bore radius
- \(E,\upsilon\) :
-
Material Young’s modulus and Poisson's ratio
- \(L\) :
-
Tooth width
- \(G\) :
-
Shear modulus
- \(I_{y1} ,I_{y2}\) :
-
Moment of inertia of the cross-sectional area \(y_{1} ,y_{2}\)
- \(A_{y1} ,A_{y2}\) :
-
Cross-sectional area \(y_{1} ,y_{2}\)
- \(\begin{gathered} L_{i}^{*} ,M_{i}^{*} ,P_{i}^{*} \;{\text{and}}\;Q_{i}^{*} \hfill \\ R_{j}^{*} ,S_{j}^{*} ,T_{j}^{*} ,U_{j}^{*} \;{\text{and}}\;V_{j}^{*} \hfill \\ \end{gathered}\) (i = 1,2,3; j = 2,3):
-
Coefficients expressing the fillet-foundation deformation a based on \(r_{f}\), \(r_{in}\) and \(\theta_{f}\)
- \(\varepsilon\) :
-
Contact ratio
- \(k_{i}^{(0)} (t)\left( {i = 1,2} \right)\) :
-
Average mesh stiffness of the first and second stages
- \(k_{i}^{(s)} (t)\left( {i = 1,2} \right)\) :
-
Mesh stiffness of the s Fourier coefficient
- \(\varphi_{is} \left( {i = 1,2} \right)\) :
-
The s mesh phasing
- \(\Omega_{i} \left( {i = 1,2} \right)\) :
-
Mesh frequency of the first and second stages
- \(T_{1} ,T_{2} ,T_{12}\) :
-
Mesh period of the first stage, the second stage and the total
- \(\Phi_{1} ,\Phi_{2} ,\Phi_{12}\) :
-
Characteristic quantity of the relationship between the coaxial teeth ratio and the mesh phasing of a two-stage gear system
- \(F_{{{\text{m}}1}} ,F_{{{\text{m}}2}}\) :
-
Mesh force of first stage and second stage
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The authors would like to acknowledge the financial support from the NSFC, the research is funded by National Natural Science Foundation of China (Contract No. 51775036), these supports are gracefully acknowledged.
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Li, W., Li, Z. Dynamic analysis of a multi-stage gear system considering the coupling between mesh phasing angle and coaxial teeth ratio. Nonlinear Dyn 111, 19855–19878 (2023). https://doi.org/10.1007/s11071-023-08896-8
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DOI: https://doi.org/10.1007/s11071-023-08896-8