Abstract
This paper proposes a systematic method, integrating the uniform design (UD) of experiments and quantum-behaved particle swarm optimization (QPSO), to solve the problem of a robust design for a railway vehicle suspension system. Based on the new nonlinear creep model derived from combining Hertz contact theory, Kalker’s linear theory and a heuristic nonlinear creep model, the modeling and dynamic analysis of a 24 degree-of-freedom railway vehicle system were investigated. The Lyapunov indirect method was used to examine the effects of suspension parameters, wheel conicities and wheel rolling radii on critical hunting speeds. Generally, the critical hunting speeds of a vehicle system resulting from worn wheels with different wheel rolling radii are lower than those of a vehicle system having original wheels without different wheel rolling radii. Because of worn wheels, the critical hunting speed of a running railway vehicle substantially declines over the long term. For safety reasons, it is necessary to design the suspension system parameters to increase the robustness of the system and decrease the sensitive of wheel noises. By applying UD and QPSO, the nominal-the-best signal-to-noise ratio of the system was increased from −48.17 to −34.05 dB. The rate of improvement was 29.31%. This study has demonstrated that the integration of UD and QPSO can successfully reveal the optimal solution of suspension parameters for solving the robust design problem of a railway vehicle suspension system.
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Abbreviations
- \(\bar{{a}}_{ij} , \bar{{b}}_{ij} \) :
-
Semi axis lengths of the wheel/rail elliptical contact region
- \(C_{11,ij} \) :
-
Lateral creepage for new nonlinear creep model
- \(C_{22,ij} \) :
-
Lateral/spin creepage for new nonlinear creep model
- \(C_{23,ij} \) :
-
Spin creepage for new nonlinear creep model
- \(C_{33,ij} \) :
-
Longitudinal creepage for new nonlinear creep model
- \(f_{11,ij} \) :
-
Lateral creep coefficient for new nonlinear creep model
- \(f_{12,ij} \) :
-
Lateral/spin creep coefficient for new nonlinear creep model
- \(f_{22,ij} \) :
-
Spin creep coefficient for new nonlinear creep model
- \(f_{33,ij} \) :
-
Longitudinal creep coefficient for new nonlinear creep model
- \(F_{kxij} , F_{kyij} \) :
-
Linear creep force on wheels in lateral and vertical directions, respectively
- \(F_{kxij}^*, F_{kyij}^*\) :
-
Linear creep force on wheels obtained from Kalker linear theory in lateral and vertical directions, respectively
- \(F_{kxij}^n , F_{kyij}^n \) :
-
Nonlinear creep force on wheels in lateral and vertical directions, respectively
- \(F_{syc} , F_{szc} \) :
-
Suspension force on car body in lateral and vertical directions, respectively
- \(F_{syij} , F_{szij} \) :
-
Suspension force on each wheelset in lateral and vertical directions, respectively
- \(F_{syti} , F_{szti} \) :
-
Suspension forces on each bogie frame in lateral and vertical directions, respectively
- G :
-
Combined shear modulus of rigidity of wheel and rail materials
- \(G\left( t \right) \) :
-
Global best position in iteration t for quantum-behaved particle swarm optimization (QPSO)
- \(M_{exij} \) :
-
External moment on each wheelset in longitudinal direction
- \(M_{kxij} , M_{kzij} \) :
-
Linear creep moment on each wheel in longitudinal and vertical directions, respectively
- \(M_{kzij}^n \) :
-
Nonlinear creep moment on each wheel in vertical direction
- \(M_{sxc} , M_{szc} \) :
-
Suspension moment on car body in longitudinal and vertical directions, respectively
- \(M_{sxij} , M_{szij} \) :
-
Suspension moment on each wheelset in longitudinal and vertical directions, respectively
- \(M_{sxti} , M_{szti} \) :
-
Suspension moment on each bogie frame in longitudinal and vertical directions, respectively
- \(N_{ij}^*\) :
-
Normal force in equilibrium state on each wheelset
- \(P_\ell \left( t \right) \) :
-
The best position of particle \(\ell \) for QPSO
- \(r_0 \) :
-
Wheel nominal rolling radius
- \(r_{i1} \) :
-
Wheel rolling radius of the front wheel of the ith bogie frame (\(i=1, 2\))
- \(r_{i2} \) :
-
Wheel rolling radius of the rear wheel of the ith bogie frame (\(i=1, 2\))
- \(\Delta r_{i1} \) :
-
Noise of \(r_{i1} (i=1, 2)\)
- \(\Delta r_{i2} \) :
-
Noise of \(r_{i2} (i=1, 2)\)
- \(r_{Lij} , r_{Rij} \) :
-
Rolling radius at the contact point for the left and right wheel
- t :
-
Time
- V :
-
Forward speed of the vehicle
- \(W_{\mathrm{ext}} \) :
-
External weight acting on each wheelset
- \(X_\ell \left( t \right) \) :
-
Position of particle \(\ell \) in iteration t for QPSO
- \(\alpha _{ij}^*\) :
-
Saturation constant of front and rear wheelsets for new nonlinear creep model
- \(\beta _{ij}^*\) :
-
Nonlinearity constant of front and rear wheelsets for new nonlinear creep model
- \(\beta _{kij} \) :
-
Nonlinearity constant of left and right wheels for new nonlinear creep model
- \(\lambda \) :
-
Wheel conicity
- \(\Delta \lambda \) :
-
Noise of \(\lambda \)
- \(\zeta \) :
-
Contraction-expansion coefficient
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Acknowledgements
The authors gratefully acknowledge the Ministry of Science and Technology of Taiwan (Grants MOST 104-2221-E-327-019, MOST 105-2221-E-327-014) for financial support of this study.
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Appendices
Appendix A: System parameters (Refs. [10, 28, 29])
Parameters | Value |
---|---|
Wheelset mass | \(m_w =1117.9\) kg |
Bogie frame mass | \(m_t =350.26\) kg |
Car body mass | \(m_c =8041.3\) kg |
Roll moment of the inertia of the wheelset | \(I_{wx} =608.1 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Spin moment of the inertia of the wheelset | \(I_{wy} =72 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Yaw moment of the inertia of the wheelset | \(I_{wz} =608.1 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Roll moment of the inertia of the bogie frame | \(I_{tx} =300 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Yaw moment of the inertia of the bogie frame | \(I_{tz} =105.2 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Roll moment of the inertia of the car body | \(I_{cx} =14270 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Yaw moment of the inertia of the car body | \(I_{cz} =123760.5 \,\,\hbox {kg}\cdot \hbox {m}^{2}\) |
Wheel radius | \(r_0 =0.43\) m |
Half of track gauge | \(a=0.7175\) m |
Wheel conicity | \(\lambda =0.05\) |
Half of primary longitudinal spring arm | \(b_1 =1.0\) m |
Half of primary longitudinal damping arm | \(b_1 =1.0\) m |
Half of primary vertical spring arm | \(b_1 =1.0\) m |
Half of primary vertical damping arm | \(b_1 =1.0\) m |
Half of secondary longitudinal spring arm | \(b_2 =1.18\) m |
Half of secondary longitudinal damping arm | \(b_3 =1.4\) m |
Half of secondary vertical spring arm | \(b_2 =1.18\) m |
Half of secondary vertical damping arm | \(b_3 =1.4\) m |
Half of primary lateral spring arm | \(L_1 =1.5\) m |
Half of primary lateral damping arm | \(L_2 =1.5\) m |
Longitudinal distance from wheelset center of gravity to car body | \(L_c =4.2\) m |
Height of external weight above center of gravity of wheelset | \(h=1.4\) m |
Vertical distance from wheelset center of gravity to car body | \(h_C =1.67\) m |
Vertical distance from wheelset center of gravity to secondary suspension | \(h_T =0.47\) m |
Longitudinal stiffness of primary suspension | \(K_{px} = 9\times 10^{5}\) N/m |
Lateral stiffness of primary suspension | \(K_{py} =3.9\times 10^{5}\) N/m |
Vertical stiffness of primary suspension | \(K_{pz} =6\times 10^{5}\) N/m |
Vertical damping of primary suspension | \(C_{pz} =4\times 10^{4} \,\,\hbox {N}\cdot \hbox {s}\)/m |
Longitudinal stiffness of secondary suspension | \(K_{sx} =3.5\times 10^{4}\) N/m |
Lateral stiffness of secondary suspension | \(K_{sy} =3.5\times 10^{4}\) N/m |
Vertical stiffness of secondary suspension | \(K_{sz} =3.5\times 10^{5}\) N/m |
Longitudinal damping of secondary suspension | \(C_{sx} =3.2\times 10^{4} \,\,\hbox {N}\cdot \hbox {s}\)/m |
Lateral damping of secondary suspension | \(C_{sy} =1\times 10^{4} \,\,\hbox {N}\cdot \hbox {s}\)/m |
Vertical damping of secondary suspension | \(C_{sz} =4\times 10^{4} \,\,\hbox {N}\cdot \hbox {s}\)/m |
Radius of curved tracks | \(R=1500\) m |
Superelevation angle of curved track | \(\phi _{se} =0.0524\) rad |
External load | \(W_\mathrm{ext} =5.6\times 10^{4}\) N |
Coefficient of friction | \(f=0.2\) |
Normal force acting on wheelset in equilibrium state | \(N={W_\mathrm{ext} }/2\) N |
Young’s modulus of wheels | \(E_w =2.058\times 10^{11}\) Pa |
Young’s modulus of rails | \(E_R =2.058\times 10^{11}\) Pa |
Poisson’s ratio of wheels | \(\sigma _R =0.3\) |
Poisson’s ratio of rails | \(\sigma _w =0.3\) |
Principal rolling radius of the wheel | \(R_1 =r_0 =0.43\) m |
Principal transverse radius of curvature of the wheel profile at the point of contact | \(R^{\prime }_1 =\infty \) |
Principal rolling radius of the rail at the point of contact | \(R_2 =\infty \) |
Principal transverse radius of curvature of the rail profile at the point of contact | \(R^{\prime }_2 =0.6\) m |
Appendix B
Normal forces:
Assuming the equilibrium speed motion of wheelsets on the circular curved tracks (Fig. 2), the vertical components of normal force for each wheelset are calculated and expressed as
Speed-dependent and linear creep forces and creep moments:
Considering the various wheel conicities \(\lambda _{ij} \) and wheel rolling radii \(r_{ij} \) at wheel/rail contact surfaces after wheel turning, the linear creep forces and moments directly calculated via Kalker’s linear theory are calculated and expressed as
where \(r_{Lij} =r_{ij} +\lambda _{ij} y_{wij} \), \(r_{Rij} =r_{ij} -\lambda _{ij} y_{wij} \), \(\delta _{Lij} =\delta _{Rij} =\lambda _{ij} \), \(\delta _{Lij} =\delta _{Rij} =\lambda _{ij} \).
Suspension forces and moments:
Wheelsets
Bogie frame
Car body
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Cheng, YC., Lee, CK. Integration of uniform design and quantum-behaved particle swarm optimization to the robust design for a railway vehicle suspension system under different wheel conicities and wheel rolling radii. Acta Mech. Sin. 33, 963–980 (2017). https://doi.org/10.1007/s10409-017-0658-7
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DOI: https://doi.org/10.1007/s10409-017-0658-7