Static Electromechanical Characteristics of Piezoelectric Converters with various Thickness and Length of Piezoelectric Layers

Mieczkowski, Grzegorz

doi:10.2478/ama-2019-0005

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…The most common brake system is the friction disc brake, which replaced the older drum brake design [ 1 , 2 , 3 , 4 ]. Brakes use friction to transform mechanical energy into thermal energy [ 5 , 6 , 7 ]. Heat is then transferred to the atmosphere and other components of the brake system and suspension of the vehicle [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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The braking system is one of the most important components in any motor vehicle. Its proper function in emergency situations may save road users’ lives. Today, as vehicles have more and more power at their disposal, leading to increased acceleration and maximum speed, the issue of effective braking is particularly important. It must also be noted that brakes are used in harsh conditions (water and salt, especially during winter), and must provide appropriate durability (on average, circa 30,000 km). For these reasons, many institutions conduct research aimed, among other things, at minimizing fading. However, this study looked into a different matter, focusing on how the operating conditions mentioned above, including the lifespan of brakes, impact the tribological properties of the friction pair. To achieve this, samples from brake pads were obtained (both brand new and used). Next, using a pin-on-disc tribological test, it was shown that the pads have lower coefficients of friction and abrasive wear rates. The results indicated that both parameters change in a manner that is dependent on how long the brake system has been in use.

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Section: Introductionmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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“…The design of a system enabling smooth adjustment of the flow rate between the valve chambers via a mechatronic system is also considered. In addition to the commonly used valves with electromagnetic actuation [31,32], piezoelectric actuation [33,34] is a certain hope.…”

Section: Results Of the Simulationmentioning

confidence: 99%

Simulation Evaluation of the Influence of Selected Geometric Parameters on the Operation of the Pneumatic Braking System of a Trailer with a Differential Valve

Szpica

Kisiel

Czaban

2022

Acta Mechanica Et Automatica

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This article presents simulation models of trailer air brake systems in configurations without a valve and with a differential valve, thus demonstrating the rationale for using a valve to improve system performance. Simplified mathematical models using the lumped method for systems without and with a differential valve are presented. The proposed valve can have two states of operation depending on the configuration of relevant parameters. These parameters can include the length of the control pipe, the throughput between chambers in the control part of the valve and the forcing rise time. Based on the calculations, it was found that the differential valve with large control pipe lengths can reduce the response time of the actuator by 42.77% relative to the system without the valve. In the case of transition of the valve to the tracking action, this time increases only by 9.93%. A force rise time of 0.5 s causes the transition of the valve from the accelerating action to the tracking action, with 9.23% delay relative to the system without a valve. The calculations can be used in the preliminary assessment of the speed of operation of pneumatic braking systems and in the formulation of guidelines for the construction of a prototypical differential valve. In conclusion, it is suggested to use a mechatronic system enabling smooth adjustment of the flow rate between chambers of the control system of the differential valve.

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“…Metal matrix composites are increasingly found in the latest solutions of the automotive industry. These matrices are used not only in braking systems, but also in clutches [71], intake systems [72], engine blocks [73], or fuel system elements, mainly classic injectors using piezoelectric stacks [74,75], as well as alternative fuels injectors [76]. These composites are also used as a partial or complete replacement for conventional materials in the production of monoqocue type frames [77].…”

Section: Bindermentioning

confidence: 99%

Conventional and unconventional materials used in the production of brake pads – review

Borawski

2020

Science and Engineering of Composite Materials

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Brakes are one of the most important components of vehicle. The brake system must be reliable and display unchanging action throughout its use, as it guards the health and life of many people. Properly matched friction pair, a disc and brake pad (in disc brakes), have a great impact on these factors. In most cases, the disc is made of grey cast iron. The brake pads are far more complex components. New technologies make it possible to develop materials with various compositions and different proportions, and connect them permanently in fully controllable processes. This elaboration shows that all these factors have a greater or lesser impact on the coefficient of friction, resistance to friction wear and high temperature, and brake pad’s operating life. This review collects the most important, the most interesting, and the most unconventional materials used in production of brake pads, and characterizes their impact on the tribological properties of pads.

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Static Electromechanical Characteristics of Piezoelectric Converters with various Thickness and Length of Piezoelectric Layers

Cited by 13 publications

References 18 publications

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Simulation Evaluation of the Influence of Selected Geometric Parameters on the Operation of the Pneumatic Braking System of a Trailer with a Differential Valve

Conventional and unconventional materials used in the production of brake pads – review

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