Assessment of the life cycle of city buses with diesel and electric drive in the operation phase

Regulski, P.

doi:10.19206/ce-162108

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…In the field of friction braking systems, work has been carried out for several years to reduce the emissions of solid wear products from friction linings, described, among others, in the works [1,11], as well as the complete elimination of copper as a component of friction linings [14,17] in favor of organic components. Work has been carried out for several years on modeling the consumption of solid friction products described in [24], and the entry into force of the new EURO 7 standard will force work to be carried out in the field of gas emissions from the braking system [36]. It is possible to recover part of the energy from the braking process by eliminating friction braking [31].…”

Section: Introductionmentioning

confidence: 99%

Model of energy consumption by brake discs of rail vehicles

Sawczuk,

Jüngst,

Kaczmarek

2024

Rail Vehicles/Pojazdy Szynowe

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The aim of the article is to present a computational model to determine the losses generated by the brake discs of rail vehicles. The energy consumption of the disc (energy losses) is divided into inertia losses and fan losses. The article is preceded by a review of the design solutions of brake discs of rail vehicles in terms of their ventilation and cooling after braking. Particular attention was paid to three types of brake disc designs with ventilation blades, bars and other shapes of ventilation bridges, and how the ventilation of these discs affects energy losses. On the one hand, forced ventilation of brake discs shortens the cooling time after intensive braking, on the other hand, it causes energy losses due to forced ventilation when the brakes are not used. The article presents the state of knowledge regarding the cooling efficiency of brake discs as a result of forced ventilation and presents a method for calculating the energy consumption generated by the brake disc in relation to the rotational speed. The energy losses were divided in the article into inertia losses due to the rotating mass and losses on the fan, in which the energy necessary for the rotation of the brake disc was determined from the method of calculating centrifugal fans with known geometric dimensions.

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Section: Introductionmentioning

confidence: 99%

Model of energy consumption by brake discs of rail vehicles

Sawczuk,

Jüngst,

Kaczmarek

2024

Rail Vehicles/Pojazdy Szynowe

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The concept of microfiltration of hydraulic oil in rail vehicles

Kołodziejski,

Bartkowiak,

Sawczuk

2024

Rail Vehicles/Pojazdy Szynowe

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The article presents the issue of microfiltration of hydraulic oil from metallic impurities and water that deteriorate the properties of the oil. Tests carried out on oils have shown that periodic oil replacement in machines or vehicles in accordance with their maintenance documentation ensures that the system is emptied of 95% of impurities from the old oil before pouring the new one. The remaining part, i.e. 5% of impurities, together with the oil remaining on the walls of the pipes or inside other hydraulic devices, will mix with the new oil, reducing its cleanliness class. Periodic replacement of hydraulic oil will not allow for complete cleaning of the system. In extreme cases, poor oil condition may cause disruptions in the operation of the machine with the hydraulic system or its downtime for oil replacement or repair. Filtering the oil in the system while the machine is running will clean the oil from impurities and water, extend the oil's service life, without disabling the hydraulic system. The article includes, among others: The justification for the use of microfiltration of hydraulic oil with portable filtering devices in order to extend the service life of the oil until the next replacement is presented. The main purpose of the article is to present the methodology for testing hydraulic oil in accordance with the requirements of ISO, NAS and SAE in order to assign the oil to a given cleanliness class. Additionally, the results of testing the oil cleanliness class in various periods of operation of the machine with the hydraulic installation on a portable measuring device were presented.

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Assessment of the life cycle of city buses with diesel and electric drive in the operation phase

Cited by 2 publications

References 21 publications

Model of energy consumption by brake discs of rail vehicles

Model of energy consumption by brake discs of rail vehicles

The concept of microfiltration of hydraulic oil in rail vehicles

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