Abstract
Spherical joints, usually known as ball and socket joints, are utilized in several engineering applications. On the one hand, these types of joints may be found in mechanical systems acting as a pivot element between the wheels and the suspension in cars. On the other hand, ball and socket joints can also be used to model human articulations, as in the case of the hip and shoulder. From more simplistic to more complex scenarios, spherical joints might be modeled using different approaches. Therefore, the objective of this work is to provide a comparative analysis of different spherical joint models and to examine their influence on the dynamic response of mechanical multibody systems. For this purpose, ideal or kinematic formulation, dry, lubricated, and bushing approaches are revised. Additionally, the formulation of the dynamic equations of motion for constrained mechanical multibody systems is succinctly described. Afterward, the kinematic and dynamic characteristics of the considered spherical joint models are comprehensively described. In this regard, normal, tangential, hydrodynamic lubrication and bushing forces experienced by the multibody systems in such cases of spherical joints are examined. The application of the spherical joint models in the dynamic modeling and simulation of multibody systems is investigated. Considering two multibody models as demonstrative examples of application from the outcomes, it is observed that the influence of the spherical joint modeling strategy on the dynamic simulation of mechanical multibody systems strongly depends on the nature of the multibody model analyzed, both in terms of dynamic response and computational efficiency.
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Abbreviations
- Symbol :
-
Description (SI Units)
- \(\mathbf{A}_{k}\) :
-
Transformation matrix of body \(k\)
- \(b\) :
-
Bushing element stiffness proportional to damping parameter
- \(c\) :
-
Radial clearance (m)
- \(c_{\mathrm{r}}\) :
-
Coefficient of restitution
- \(\mathbf{D}\) :
-
Jacobian matrix of the constraint equations
- \(\mathbf{e}\) :
-
Eccentricity vector (m)
- \(E_{k}\) :
-
Young’s modulus of body \(k\) (Pa)
- \(e\) :
-
Magnitude of the eccentricity vector (m)
- \(e\) h0, \(e\) h1 :
-
Tolerances for the eccentricity (m)
- \(\dot{e}\) :
-
Time rate of the eccentricity in the radial direction (m/s)
- \(\mathbf{f}_{\mathrm{b}}\) :
-
Bushing force (N)
- \(f_{\mathrm{c}}\) :
-
Magnitude of the Coulomb friction (N)
- \(f_{\mathrm{d}}\) :
-
Damping force of the shock absorber linked to the A-arm (N)
- \(\mathbf{f}_{\mathrm{e}}\) :
-
External tangential force vector (N)
- \(f_{\mathrm{h}}\) :
-
Hybrid force for lubricated joint (N)
- \(f_{\mathrm{k}}\) :
-
Elastic force of the shock absorber linked to the A-arm (N)
- \(f_{\mathrm{l}}\) :
-
Lubrication force (N)
- \(f_{\mathrm{n}}\) :
-
Normal contact force (N)
- \(f_{\mathrm{s}}\) :
-
Magnitude of the static friction (N)
- \(\mathbf{f}_{\mathrm{t}}\) :
-
Tangential or friction force (N)
- \(\mathbf{g}\) :
-
External generalized force vector (N, N m)
- \(K\) :
-
Generalized contact stiffness (N/m1.5)
- \(k\) :
-
Bushing element stiffness (N/m)
- \(\mathbf{M}\) :
-
Mass matrix (kg, kg m2)
- \(\mathbf{n}\) :
-
Normal unit vector
- \(n\) :
-
Hertzian nonlinear exponent
- \(O_{k}\) :
-
Center of mass of body \(k\)
- \(P_{k}\) :
-
Point representing the center of the ball or socket on body \(k\)
- \(p_{k}\) :
-
Euler parameters, \(k\) = 0, 1, 2, 3
- \(Q_{k}\) :
-
Contact point on body \(k\)
- \(\mathbf{r}_{k}\) :
-
Position vector of the center of mass of body \(k\) described in global coordinates (m)
- \(\mathbf{r}_{k}^{P}\) :
-
Global position vector of point \(P\) located on body \(k\) (m)
- \(\mathbf{r}_{k}^{Q}\) :
-
Position vector of the contact point \(Q_{k}\) expressed in global coordinates (m)
- \(R_{k}\) :
-
Radius of element \(k\) (m)
- \(\mathbf{s}_{k}^{P}\) :
-
Global position vector of point \(P\) located on body \(k\) with respect to local coordinates (m)
- \(\mathbf{t}\) :
-
Tangential direction of the relative velocity associated with the contacting surfaces
- \(t\) :
-
Time variable (s)
- \(v_{0}\), \(v_{1}\) :
-
Tolerances for the velocity (m/s)
- \(\dot{\mathbf{v}}\) :
-
Vector containing the system accelerations (m/s2, rad/s2)
- \(\mathbf{v}_{\mathrm{n}}\) :
-
Relative normal velocity of the contact point (m/s)
- \(v_{\mathrm{S}}\) :
-
Stribeck velocity (m/s)
- \(\mathbf{v}_{\mathrm{t}}\) :
-
Relative tangential velocity of the contact point (m/s)
- \(v_{\mathrm{t}}\) :
-
Magnitude of the relative tangential velocity (m/s)
- \(x\) :
-
Distance between the two ends of the shock absorber (m)
- \(x_{\mathrm{B}}\) :
-
Horizontal position of the bump profile (m)
- xyz :
-
Global coordinate system (m)
- \(\dot{x}\) :
-
Deformation velocity of the shock absorber (m/s)
- \(\dot{\mathbf{y}}\) :
-
Auxiliary vector containing the system accelerations and velocities (m/s2, m/s)
- \(\mathbf{y}\) :
-
Auxiliary vector containing the system velocities and positions (m/s, m)
- \(z_{\mathrm{B}}\) :
-
Vertical position of the bump profile (m)
- Symbol :
-
Description (SI Units)
- \(\boldsymbol{\Phi}\) :
-
Position constraint equations
- \(\dot{\boldsymbol{\Phi}} \) :
-
Velocity constraint equations
- \(\ddot{\boldsymbol{\Phi}} \) :
-
Acceleration constraint equations
- \(\alpha\) :
-
Baumgarte stabilization coefficient
- \(\beta\) :
-
Baumgarte stabilization coefficient
- \(\delta\) :
-
Pseudo-penetration or deformation (m)
- \(\dot{\delta} \) :
-
Pseudo-penetration velocity (m/s)
- \(\dot{\delta}^{( - )}\) :
-
Initial contact velocity (m/s)
- \(\varepsilon\) :
-
Eccentricity ratio
- \(\dot{\varepsilon} \) :
-
Time rate of the eccentricity ratio
- \(\boldsymbol{\upgamma}\) :
-
Right-hand side vector of the acceleration equations
- \(\kappa\) :
-
Parameter representing the negative slope of the sliding state (s/m)
- \(\boldsymbol{\lambda}\) :
-
Lagrange multipliers vector
- \(\mu_{\mathrm{k}}\) :
-
Kinetic coefficient of friction
- \(\mu_{\mathrm{s}}\) :
-
Static coefficient of friction
- \(\nu\) :
-
Lubricant dynamic viscosity (Pa s)
- \(\sigma_{k}\) :
-
Material property of body \(k\) (Pa−1)
- \(\upsilon_{k}\) :
-
Poisson’s ratio of body \(k\)
- \(\boldsymbol{\upomega }\) :
-
Angular velocity vector (rad/s)
- \(\xi\eta\zeta\) :
-
Body fixed coordinate system (m)
- Symbol :
-
Description
- \(i\) :
-
Relative to body \(i\)
- \(j\) :
-
Relative to body \(j\)
- \(k\) :
-
Relative to body \(k\)
- n:
-
Normal direction
- t:
-
Tangential direction
- Symbol :
-
Description
- \(P\) :
-
Generic point \(P\)
- \(Q\) :
-
Generic contact point \(Q\)
- \(s\) :
-
Spherical joint
- Symbol :
-
Description
- ( )T :
-
Matrix or vector transpose
- (´):
-
Components of a vector in a body-fixed coordinate system
- (\(^{\boldsymbol{\cdot}}\)):
-
First derivative with respect to time
- (⋅⋅):
-
Second derivative with respect to time
- (∼):
-
Skew-symmetric matrix or vector
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Acknowledgements
This work has been supported by Portuguese Foundation for Science and Technology, under the national support to R&D units grant, with the reference project UIDB/04436/2020 and UIDP/04436/2020, as well as through IDMEC, under LAETA, project UIDB/50022/2020. The first author expresses her gratitude to the Portuguese Foundation for Science and Technology through the PhD grant (2021.04840.BD).
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Mariana Rodrigues da Silva: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Resources; Software; Validation; Visualization; Writing – original draft; Writing – review & editing.
Filipe Marques: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Project administration; Software; Supervision; Validation; Visualization; Writing – review & editing.
Miguel Tavares da Silva: Conceptualization; Data curation; Investigation; Methodology; Supervision; Validation; Writing – review & editing.
Paulo Flores: Conceptualization; Data curation; Investigation; Methodology; Project administration; Software; Supervision; Validation; Writing – review & editing.
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Rodrigues da Silva, M., Marques, F., Tavares da Silva, M. et al. A comparison of spherical joint models in the dynamic analysis of rigid mechanical systems: ideal, dry, hydrodynamic and bushing approaches. Multibody Syst Dyn 56, 221–266 (2022). https://doi.org/10.1007/s11044-022-09843-y
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DOI: https://doi.org/10.1007/s11044-022-09843-y