The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
Abd Rahim Abu Bakar - One of the best experts on this subject based on the ideXlab platform.
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Experimental studies of friction-induced brake squeal: Influence of environmental sand particles in the interface brake pad-disc
Tribology International, 2017Co-Authors: Mohamed Kchaou, A. R. Mat Lazim, M.k. Abdul Hamid, Abd Rahim Abu BakarAbstract:Abstract The disc brake squeal is a very annoying sound which affects the customer comfort. The generation of this noise is considered as a structural dynamics and/or tribological problems of the pad-disc system. Unlike drum brake design, this system is exposed to external environmental sand particles, wear debris and water spray. Their presence into the disc and pad interface may create dynamic and physics phenomena induced by friction Surface changes which lead to brake noise and vibration issues. Thus, this paper aims to investigate the effect of environmental sand particles (silica sand and road sand particles) with a range size of 100–150, 150–200 and 300–400 µm on the brake squeal noise occurrences. The sensitivity of the sand particles to produce noise is correlated with the wear scar, friction coefficient and variation of brake operational parameters. It was concluded that the primary reason for the reduced squeal noise generation was contributed to the reduced COF with the particle embedment. The analysis of the particle size influence on the squeal occurrence indicated that a small size of silica sand particle produces less squeal occurrence than that of road sand particles. However, the biggest silica and sand particles seriously damage the pad Surface and reduce consequently the Real Contact Surface, inducing a decrease on the friction coefficient.
Ahmad Razimi - One of the best experts on this subject based on the ideXlab platform.
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Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
2020Co-Authors: Mat Lazim, Ahmad RazimiAbstract:The disc brake squeal is a very annoying sound and a source of considerable discomfort that leads to customer dissatisfaction. There are various possible mechanisms that could trigger brake squeal generation either from a structural dynamics or tribological point of view. Unlike drum brake design, the disc brake assembly, particularly the disc and the pads are exposed to any unwanted road particle, wear debris and water spray. Their presence into the disc and pad interfaces may create dynamic and physics phenomena induced by friction Surface changes which lead to the brake noise and vibration issues. Thus, the objective of this research is to investigate a characterization of the worn Surface of squealing brake friction material with the effect of different sizes of foreign particles using laboratory scale brake test rig. The correlation between squeal generation and tribological characteristics of the pad including Surface topography, Surface roughness, wear, element composition and friction coefficient are established by using squeal index and qualitative analysis. The foreign particles (silica sand and road sand particles) with the sizes of 100-150, 200-300 and 300-400 um are introduced into the brake disc and pad interfaces. The sensitivity of sand particles in producing squeal noise is also examined at different brake pressures, disc temperatures and speeds. The experimental results show that both sand particles have a significant effect on the brake squeal occurrences. The tribological properties reveal that squeal is more affected by smaller sand particle size. The micrometric particles act as punctual Contact Surfaces generating more wear debris which are accumulated and compacted inducing a reduction of the friction level. However, the biggest particle size damages the pad Surface, reduces the Real Contact Surface and decreases the friction coefficient, yet generates more wear lost. It was found that foreign particles play an important role in reducing the squeal level on the pad Surface as well as increasing the value of the squeal index number.
Mohamed Kchaou - One of the best experts on this subject based on the ideXlab platform.
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Experimental studies of friction-induced brake squeal: Influence of environmental sand particles in the interface brake pad-disc
Tribology International, 2017Co-Authors: Mohamed Kchaou, A. R. Mat Lazim, M.k. Abdul Hamid, Abd Rahim Abu BakarAbstract:Abstract The disc brake squeal is a very annoying sound which affects the customer comfort. The generation of this noise is considered as a structural dynamics and/or tribological problems of the pad-disc system. Unlike drum brake design, this system is exposed to external environmental sand particles, wear debris and water spray. Their presence into the disc and pad interface may create dynamic and physics phenomena induced by friction Surface changes which lead to brake noise and vibration issues. Thus, this paper aims to investigate the effect of environmental sand particles (silica sand and road sand particles) with a range size of 100–150, 150–200 and 300–400 µm on the brake squeal noise occurrences. The sensitivity of the sand particles to produce noise is correlated with the wear scar, friction coefficient and variation of brake operational parameters. It was concluded that the primary reason for the reduced squeal noise generation was contributed to the reduced COF with the particle embedment. The analysis of the particle size influence on the squeal occurrence indicated that a small size of silica sand particle produces less squeal occurrence than that of road sand particles. However, the biggest silica and sand particles seriously damage the pad Surface and reduce consequently the Real Contact Surface, inducing a decrease on the friction coefficient.
Mat Lazim - One of the best experts on this subject based on the ideXlab platform.
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Squealing occurrence of worn brake pads to foreign particles embedment into the friction layers
2020Co-Authors: Mat Lazim, Ahmad RazimiAbstract:The disc brake squeal is a very annoying sound and a source of considerable discomfort that leads to customer dissatisfaction. There are various possible mechanisms that could trigger brake squeal generation either from a structural dynamics or tribological point of view. Unlike drum brake design, the disc brake assembly, particularly the disc and the pads are exposed to any unwanted road particle, wear debris and water spray. Their presence into the disc and pad interfaces may create dynamic and physics phenomena induced by friction Surface changes which lead to the brake noise and vibration issues. Thus, the objective of this research is to investigate a characterization of the worn Surface of squealing brake friction material with the effect of different sizes of foreign particles using laboratory scale brake test rig. The correlation between squeal generation and tribological characteristics of the pad including Surface topography, Surface roughness, wear, element composition and friction coefficient are established by using squeal index and qualitative analysis. The foreign particles (silica sand and road sand particles) with the sizes of 100-150, 200-300 and 300-400 um are introduced into the brake disc and pad interfaces. The sensitivity of sand particles in producing squeal noise is also examined at different brake pressures, disc temperatures and speeds. The experimental results show that both sand particles have a significant effect on the brake squeal occurrences. The tribological properties reveal that squeal is more affected by smaller sand particle size. The micrometric particles act as punctual Contact Surfaces generating more wear debris which are accumulated and compacted inducing a reduction of the friction level. However, the biggest particle size damages the pad Surface, reduces the Real Contact Surface and decreases the friction coefficient, yet generates more wear lost. It was found that foreign particles play an important role in reducing the squeal level on the pad Surface as well as increasing the value of the squeal index number.
M.k. Abdul Hamid - One of the best experts on this subject based on the ideXlab platform.
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Experimental studies of friction-induced brake squeal: Influence of environmental sand particles in the interface brake pad-disc
Tribology International, 2017Co-Authors: Mohamed Kchaou, A. R. Mat Lazim, M.k. Abdul Hamid, Abd Rahim Abu BakarAbstract:Abstract The disc brake squeal is a very annoying sound which affects the customer comfort. The generation of this noise is considered as a structural dynamics and/or tribological problems of the pad-disc system. Unlike drum brake design, this system is exposed to external environmental sand particles, wear debris and water spray. Their presence into the disc and pad interface may create dynamic and physics phenomena induced by friction Surface changes which lead to brake noise and vibration issues. Thus, this paper aims to investigate the effect of environmental sand particles (silica sand and road sand particles) with a range size of 100–150, 150–200 and 300–400 µm on the brake squeal noise occurrences. The sensitivity of the sand particles to produce noise is correlated with the wear scar, friction coefficient and variation of brake operational parameters. It was concluded that the primary reason for the reduced squeal noise generation was contributed to the reduced COF with the particle embedment. The analysis of the particle size influence on the squeal occurrence indicated that a small size of silica sand particle produces less squeal occurrence than that of road sand particles. However, the biggest silica and sand particles seriously damage the pad Surface and reduce consequently the Real Contact Surface, inducing a decrease on the friction coefficient.
