Experimental and numerical studies of mechanical subsystem for simulation of agricultural trailer air braking systems

Kamiński, Zbigniew

doi:10.1504/ijhvs.2013.056802

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Unfortunately, the coefficient is not a constant value—this is a known problem in various research streams [ 9 , 10 , 11 , 12 , 13 ]. Significant changes in temperature of the brake system’s working parts may cause the coefficient of friction between the disc and pad to fall, in some cases, almost to zero [ 14 ]. In addition, the humidity in the close surroundings of the friction pair is important.…”

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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“…step 1 × 10 -6 s) in MATLAB/Simulink software [26]. This software is characterised by the ease of implementation of the adopted empirical models and the possibility of replicating the repeating subsytems using masking, as confirmed in studies [27][28][29].…”

Section: Results Of the Simulationmentioning

confidence: 99%

“…2. In defining the parameters and initial conditions, data provided in previous studies [5,9,29] were used. The underlined values indicate their variability within specified limits.…”

Section: Technical Data and Conditions Necessary To Initiate A Simula...mentioning

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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“…The mathematical modelling of the low-pressure gas injector can be based on mathematical descriptions of electrovalves from pneumatic actuators (Rahman et al, 1996a(Rahman et al, , 1996bChu et al, 2007;Kamiński, 2013Kamiński, , 2014 or liquid fuel injectors. In case of fuel injectors, the models can be divided into physical zero, single or multi-dimensional (Matković et al, 2005;Czarnigowski et al, 2007;Ouyang, 2009; Minghai and Feng, 2010; Li and Jiang, 2010) and empirical (Duk and Czarnigowski, 2001;Mehlfeldt et al, 2008;Yang et al, 2012, Borawski, 2015a.…”

Section: Modelling Methodologymentioning

confidence: 99%

Modelling of the Low-Pressure Gas Injector Operation

Szpica

Kusznier

2020

Acta Mechanica Et Automatica

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In recent years, there has been a growing interest in alternative sources of power supply for internal combustion engines. Liquefied petroleum gas injection systems are among the most popular. It becomes necessary to know mathematical descriptions of the operation of individual components. The article presents a mathematical model that describes the operation of the low-pressure gas injector. Valtek plunger injector was chosen as the test object. The mathematical description includes three parts, i.e. electric, mechanical and pneumatic. The electrical part describes the generation of electromagnetic force by a circuit with a coil, in the mechanical equilibrium equation of forces acting on the plunger, and in the pneumatic part the air pressure on the plunger. The calculations were performed in the Matlab/Simulink environment, creating current waveforms, acting forces and plunger displacement. Correctness of mathematical description and determined in the course of opening and closing time calculations were related to the values declared by the manufacturer, showing differences below 3%. The presented mathematical model can be modified for other injector design solutions.

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Experimental and numerical studies of mechanical subsystem for simulation of agricultural trailer air braking systems

Cited by 8 publications

References 11 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

Modelling of the Low-Pressure Gas Injector Operation

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