Abstract
Oscillations generated by the windscreen frameless wiper blades during operation will cause unwanted noise and scraping defects, which is a problem that manufacturers need to address. However, the generation mechanism of oscillations is unclear, and the systematic research and development scheme for wiper blades is absent. In this paper, a closed-loop scheme of wiper blade structural design and performance prediction is proposed to solve the problem of oscillations. A sectional linkage model of the wiper system and a stability discriminant were proposed to explain the deep-seated causes of oscillations and explore the critical influencing parameters. Transient structural simulation based on hyperelastic neoprene material and friction exponential decay model was performed to investigate the wiper blade’s nonlinear dynamic behavior and verify the proposed theory’s reliability. The results indicate that the generation mechanism of oscillations can be explained as the instability of the wiper blade due to the excitation of negative friction characteristics. The wiper operates in three conditions, namely slip, stick and skim, each with different dynamic behavior and prerequisites. In a wiping cycle, the periods of slip and stick are closely related to the stability of the wiper blade, while the period of skim is stochastic. The oscillation time, absolute integral of acceleration, and average normal force can be adopted as the indicators of oscillation intensity. Based on the stability discriminant, the critical parameters affecting the oscillation intensity were obtained, which can be adopted in the optimization design of the wiper blade.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- W :
-
Strain energy potential function
- \(\mu _{1i}, \alpha _i\) :
-
Hyperelastic material constants
- \(D_k\) :
-
Incompressibility parameter
- \(\lambda _{a,b,c}\) :
-
Principal elongation parameters
- \(\mu _\textrm{e}\) :
-
Friction coefficient characterized by the exponential decay model
- \(\mu _\textrm{s}\) :
-
Friction coefficient characterized by the Stribeck model
- \(v_\textrm{rel}\) :
-
Horizontal relative velocity of the blade lip tip relative to the windscreen
- Mu:
-
Static coefficient of friction in the exponential decay model
- Fact:
-
Ratio of static to dynamic coefficients of friction in the exponential decay model
- DC:
-
Decay coefficient in the exponential decay model
- \(\textrm{co}_1\) :
-
Static coefficient of friction in the Stribeck model
- \(\textrm{co}_2\) :
-
Dynamic coefficient of friction in the Stribeck model
- \(\textrm{co}_3\) :
-
Decay coefficients in the Stribeck model
- \(l_0\) :
-
Customized representative length
- T :
-
Dimensionless representative time
- t :
-
Wiper system motion time
- \(l_1\) :
-
Length of the upper linkage, which represents the length of the blade body
- \(l_2\) :
-
Length of the upper linkage, which represents the length of the blade lip
- \(l_{G_1}\) :
-
Distances from the midpoint of the blade neck to the centroid of the blade body
- \(l_{G_2}\) :
-
Distance from the boundary between the blade body and lip to the centroid of the blade lip
- \(I_1\) :
-
Moment of inertia of the blade body rotating around an axis passing through its centroid and perpendicular to the cross section of the wiper system
- \(I_2\) :
-
Moment of inertia of the blade lip rotating around an axis passing through its centroid and perpendicular to the cross section of the wiper system
- \(\rho \) :
-
Density of neoprene rubber
- \(m_1\) :
-
Mass of the blade body
- \(m_2\) :
-
Mass of the blade lip
- \(k_0\) :
-
Elastic coefficient of the vertical spring at the support side equated by the blade head, spring beams and holder reinforcements
- \(c_0\) :
-
Viscous coefficient of the vertical spring at the support side equated by the blade head, spring beams and holder reinforcements
- \(c_1\) :
-
Viscous coefficient of the torsion spring at the blade neck
- \(c_2\) :
-
Viscous coefficient of the torsion spring at the midpoint of the boundary between the blade body and lip
- \({\widetilde{\varphi }}\) :
-
Critical rotation angle of the blade body when it just touches the blade shoulder
- \(\varphi _1\) :
-
Rotation angle of the blade body around the midpoint of the blade neck
- \(\varphi _2\) :
-
Rotation angle of the blade lip around the midpoint of the boundary between the blade body and lip
- \(k_{\varphi _1}\) :
-
Elasticity coefficient of the equivalent torsion spring at the centroid of the blade neck
- \(k_M\) :
-
Elastic coefficient of the equivalent torsion spring at the blade neck when the blade body is in contact with the blade shoulder
- \(k_m\) :
-
Elastic coefficient of the equivalent torsion spring at the blade neck when the blade body is not in contact with the blade shoulder
- \(k_{\varphi _2}\) :
-
Elasticity coefficient of the equivalent torsion spring at the boundary between the blade body and lip
- \(M_{\varphi _1}\) :
-
Restoring moment at the blade neck
- \(m_{a,b,c}\) :
-
Dimensionless coefficients related to mass
- \(m_{{\varphi _1},{\varphi _2}}\) :
-
Dimensionless moments of inertia
- S :
-
Horizontal displacement of the windscreen relative to the blade head
- \(h_\textrm{d}\) :
-
Push-down distance of the support side
- \(V_\textrm{s}\) :
-
Velocity amplitude of the horizontal motion of the windscreen in sinusoidal form
- \(f_\textrm{s}\) :
-
Frequency of velocity change of the windscreen moving horizontally in sinusoidal form
- \(\emptyset \) :
-
Initial phase of the velocity of the windscreen moving horizontally in sinusoidal form
- \(\lambda _\textrm{N}\) :
-
Normal force of the blade lip tip in contact with the windscreen
- \(\lambda _\textrm{T}\) :
-
Friction between the blade lip tip and the windscreen
- J :
-
Jacobian matrix
- \(\lambda _{1,2}\) :
-
Eigenvalues of the Jacobian matrix J
- \(\chi _1\) :
-
Parameter in eigenvalues, which is also the stability discriminant
- \(\chi _2\) :
-
Parameter in eigenvalues
- \(\chi _2\) :
-
Parameter in eigenvalues
- \({\Delta t}\) :
-
Oscillation time
- H :
-
Maximum overshoot
- AIA:
-
Absolute integral of acceleration
- \({\lambda _\textrm{N}}_\textrm{avr}\) :
-
Average normal force in the reversal position
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Appendix A: Coefficients in the equations
Appendix A: Coefficients in the equations
The coefficients in (10) are expressed as follows:
And the coefficients in (11) are expressed as follows:
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Li, Y., Xu, J. Dynamic characteristics and generation mechanism of windscreen frameless wiper blade oscillations. Nonlinear Dyn 111, 3053–3079 (2023). https://doi.org/10.1007/s11071-022-08030-0
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DOI: https://doi.org/10.1007/s11071-022-08030-0