Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

Lazzari, Alessandro; Tonazzi, Davide; Conidi, Giovanni; Malmassari, Cristian; Cerutti, Andrea; Massi, Francesco

doi:10.3390/lubricants6040107

Cited by 20 publications

(8 citation statements)

References 32 publications

(44 reference statements)

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“…This proves experimentally that in the velocity interval (7.5-13 mm/s) the system dynamical equilibria can result in stick-slip oscillations (acceleration phase) or in steady sliding Fig. 8 Friction-velocity characteristic curve for epoxy resin obtained on a dedicated tribometer [44,47] (deceleration phase) determining a region of bistability, as indeed found in literature for lumped systems [35].…”

Section: Non-linear Stick-slip Responsesupporting

confidence: 79%

“…It order to obtain a frictional response with static friction higher than the dynamic one, the oscillator was coated on the contact side with an epoxy resin. The frictional response of the used epoxy resin in contact with steel material has been measured on a dedicated tribometer [44,47] to retrieve the frictionvelocity characteristic curve, shown in Fig. 8.…”

Section: Test-benchmentioning

confidence: 99%

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Numerical and experimental analysis of the bi-stable state for frictional continuous system

et al. 2020

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Unstable friction-induced vibrations are considered an annoying problem in several fields of engineering. Although several theoretical analyses have suggested that friction-excited dynamical systems may experience sub-critical bifurcations, and show multiple coexisting stable solutions, these phenomena need to be proved experimentally and on continuous systems. The present work aims to partially fill this gap. The dynamical response of a continuous system subjected to frictional excitation is investigated. The frictional system is constituted of a 3D printed oscillator, obtained by additive manufacturing that slides against a disc rotating at a prescribed velocity. Both a finite element model and an experimental setup has been developed. It is shown both numerically and experimentally that in a certain range of the imposed sliding velocity the oscillator has two stable states, i.e. steady sliding and stick–slip oscillations. Furthermore, it is possible to jump from one state to the other by introducing an external perturbation. A parametric analysis is also presented, with respect to the main parameters influencing the nonlinear dynamic response, to determine the interval of sliding velocity where the oscillator presents the two stable solutions, i.e. steady sliding and stick–slip limit cycle.

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Section: Non-linear Stick-slip Responsesupporting

confidence: 79%

Section: Test-benchmentioning

confidence: 99%

Numerical and experimental analysis of the bi-stable state for frictional continuous system

et al. 2020

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“…The correct modeling of contact interfaces is a key factor in many engineering applications that inherently include contacts between components, e.g., friction joints [1][2][3], clamping devices, robotic contacts, rolling bearings [4,5], brake systems [6], etc. Contact mechanics between component surfaces also play a key role for understanding many tribological processes, such as friction-induced vibrations [7][8][9][10][11], stick-slip phenomena [12][13][14], frictional instability [7,15], adhesion, and wear [16,17]. An accurate contact modeling of such systems requires knowledge of interface contact parameters [18] such as contact stiffness, which are not easily measurable and completely understood.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Normal Contact Stiffness for Frictional Interface in Sticking and Sliding Conditions

et al. 2019

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Modeling of frictional contact systems with high accuracy needs the knowledge of several contact parameters, which are mainly related to the local phenomena at the contact interfaces and affect the complex dynamics of mechanical systems in a prominent way. This work presents a newer approach for identifying reliable values of the normal contact stiffness between surfaces in contact, in both sliding and sticking conditions. The combination of experimental tests, on a dedicated set-up, with finite element modeling, allowed for an indirect determination of the normal contact stiffness. The stiffness was found to increase with increasing contact pressure and decreasing roughness, while the evolution of surface topography and third-body rheology affected the contact stiffness when sliding.

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“…An accelerometer is used for measuring the vibrational response of the system during the movement. This system is especially designed for reproducing and measuring contact-induced vibrations without introducing parasite noise from other contact interfaces [26].…”

Section: Local Greased Contact Responsementioning

confidence: 99%

Examination of stick-slip scenario on lubricated spring-brake systems

Ghezzi¹,

Tonazzi²,

Rovere³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

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Several complex mechanisms can be responsible for undesirable friction-induced vibrations in many mechanical systems. This paper presents a tribological and dynamic analysis of the stick-slip problem, under greased lubrication, taking into account the practical application of a spring-brake system used in electric tubular motors. The main functioning of these brakes is based on the frictional greased contact between a stationary cylinder and a torsional spring, which rotates inside it. The identification of the parameters that most affect the stick-slip appearance in greased contacts requires a complete understanding and appropriate analysis of the entire system, to identify the effects of all physical parameters on the system. Here the global dynamics and the local contact behaviour is analysed, providing an in-depth examination of the stick-slip phenomenon on a greased contact.

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Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

Cited by 20 publications

References 32 publications

Numerical and experimental analysis of the bi-stable state for frictional continuous system

Numerical and experimental analysis of the bi-stable state for frictional continuous system

Estimation of the Normal Contact Stiffness for Frictional Interface in Sticking and Sliding Conditions

Examination of stick-slip scenario on lubricated spring-brake systems

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