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Numerical Modelling of Composite Brake Pad Operational Deflection Shapes

Name: Mohammad Ravanbod

Company: University of Bradford

Presentation Title: Numerical Modelling of Composite Brake Pad Operational Deflection Shapes (EB2021-STP-008)

Session: Posters, Monday 17 May 2021, 17:30 - 19:30 (Central European Summer Time - CEST)

What do you find most interesting about the topic of your presentation?

The majority of the work was carried out to improve the understanding of the influence of friction material properties on the pad natural frequencies, to see how the pad natural frequencies can change with the changes in the material properties of the composite brake pad. The most interesting thing about the subject is, how we can manage the pad

natural frequency through changing the fiction material properties. By the results from this project, we are capable to select a suitable friction material for composite pads in order to give us the desirable natural frequencies.

When discussing this topic with industry peers, what question are you most frequently asked? How do you answer it?

The most likely question that may come to audiences’ minds is about how we can use this data to reduce brake squeal.

The answer is that many researchers have studied the brake squeal through complex eigenvalue analysis. It is worth nothing that the brake squeal is a phenomenon, which depends on system instability, and it should study on the whole disc-brake system.

In fact, discs, calipers and other components have solid materials with Isotropic properties and their properties and natural frequencies are reported by the manufacturer. However, brake pads are a complex composite and there is no constant and specified properties for them, and most manufacturers keep their confidential information secret. Therefore, this project focuses on the influence of friction material characteristics on the pad natural frequencies to observe how the natural frequency changes with the changes in the friction material properties.

In addition, if the pad frequencies are coupled with the disc frequencies, it can cause to trigger brake squeal phenomenon. By the obtained knowledge from this project, we are capable to propose the optimal values for the friction material properties, in order to select a composite pad which has different natural frequencies from the disc frequencies, to prevent the natural frequencies from coupling with the disc frequencies.

Future work:

Moreover, when the components are assembled together as a system, their natural frequencies will be different from when we study them separately. However, the project recommends selecting brake pads with natural frequencies different from those of disc frequencies before assembly to understand, how it affects the brake squeal. Then, we perform complex eigenvalue analysis on the whole disc-brake system, and we monitor the natural frequencies.

Who do you think will be most interested in your presentation, and who would you most like to ask questions about it?

Those who are working on brake NVH through using numerical and experimental analysis of disc-brake systems. Also, those who are studying composite brake pad materials to improve their noise-absorbing performance.

What specific topics or technology are you hoping to see in other presentations or in the exhibition?

I would like to see presentations that focus on numerical analysis of composite brake pads, brake squeal, and performing free-free analysis, and complex eigenvalue analysis. In addition, I am eager to get to know the researchers who are studying using Active Noise Control Methods to reduce braking noise.

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About Mohammad Ravanbod

Mohammad Ravanbod is a mechanical engineer with a professional background in brake NVH, and noise control, specific in the fields of structural vibration, disc-brake, and suspension systems. He holds a master of science in Advanced Mechanical Engineering from Bradford University, department of Automotive and Mechanical engineering where he was a researcher for studying NVH on disc-brake systems. Currently, he is a researcher for Active Noise Control at Lancaster University, department of Control and Electronics, as well as a researcher for acoustics meta-materials at Shiraz University.

Ravanbod has conducted numerical and experimental studies of composite brake pad. Is his current post, he has been studying acoustics meta-materials to improve their sound absorbing properties through Passive Noise Control methods.

On the other hand, he currently is a member of a research team based at Lancaster University investigating new procedures and technologies to solve long-standing behavioral issues with effective use of Active Noise Control to prevent noise hearing in the car cabin.

Prior to these researches, he was an Automotive Assistant at Chery Motors, where he had responsibilities for designing and testing of steering and suspension systems.

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