Technical Transactions iss. 21. Mechanics iss. 3-M

Technical Transactions iss. 21. Mechanics iss. 3-M

Type: Collection of magazine numbers
Release date

Collection items (10)



The effect of deformation route in Equal Channel Angular Pressing on mechanical properties of aluminum alloy 1050

Maciejasz, Katarzyna, Bogucki, Rafał
Article
2015
Annealed samples of commercial purity aluminium (1050) were processed by Equal Channel Angular Pressing (ECA P) at room temperature for up to eight passes. ECA P was conducted by using three processing routes (schemes). Tensile tests and micro hardness were conducted to evaluate variation of mechanical properties after each pass. Analysis of fractography was carried out due to investigate a fracture of the samples. The results showed that all the schemes had similar micro hardness values – around 50 HV. The tensile test results showed that the highest yield strength was achieved in the second scheme after eight passes – 186 MPa – while elongation maintained at the level of 17.4%. The value of yield strength achieved increased more than six times in proportion to annealed condition.

Analysis of the sintering process of 316L – hydroxyapatite composite biomaterials

Szewczyk-Nykiel, Aneta, Nykiel, Marek
Article
2015
The 316L-hydroxyapatite biocomposites were produced by the powder metallurgy technology. The properties and microstructure of these materials are affected by the chemical composition of the powders mixture and the sintering temperature. The sintering temperature of 1240°C and hydroxyapatite addition in an amount of 3% of mass obtained the highest density and hardness and smaller open and closed porosity. Hydroxyapatite addition to austenitic stainless steel modified sintering behaviour. During heating the thermal decomposition of hydroxyapatite took place, which led to the formation of a CaO phase. However, phosphorus diffused into the austenitic matrix and was involved in the eutectic transformation.

Influence of car wheel suspension parameters on improvement of active safety and ride comfort

Dobaj, Krzysztof
Article
2015
This paper deals with the simulation of car suspension parameter impact on the contact between the tyre and an uneven road. The simulation was based on the quarter car vehicle model used for the analysis of vertical vibrations of sprung and unsprung mass under the influence of discrete road unevenness. The parameters of the model relate to the front axle of a VW Passat B5. Suspension and damping characteristics were described by non-linear functions. The results included in the paper cover the influence of changing the rebound damping force, main spring stiffness coefficient and the unsprung mass on active safety and ride comfort.

Possibility of existence of torsional vibrations of beams in low frequency range

Augustyn, Elżbieta, Kozień, Marek S.
Article
2015
This paper discusses the problem of the existence of torsional natural modes in the low frequency range for a beam with a rectangular cross-section with different ratios between width and height and different lengths. The rectangular type of cross-section is chosen because of practical applications to describe the vibrations of some turbine blades. The analyses were conducted by applying an analytical model, but were verified using the finite element method.

Modelling manoeuvres that may induce side skid in a front-wheel drive car

Kluziewicz, Michał
Article
2015
The simulation and experimental verification of oversteer inducing manoeuvres are presented. A transient state of oversteering in a front-wheel drive car is initiated only by using steering wheel, throttle and brake inputs. The car’s motion is simulated with a single-track dynamic model with a parameterized input that sufficiently reproduces the behaviour of a front-wheel drive Peugeot 106 XSI (group N). The conclusions may be useful in better understanding complex driving techniques and vehicle dynamics that are not commonly described in basic elaborations.

Tests of diesel drives carried out at KOMAG

Dobrzaniecki, Piotr, Kaczmarczyk, Krzysztof
Article
2015
The directions of KOMAG’s investigations into diesel drives used in workings at risk of explosion are described. Two groups of research problems, i.e. the impact of a flameproof inlet-outlet system on the engine’s operational parameters as well as identifying the phenomena in the engine regarding the emission of toxic substances with tests on improvement in the quality of exhaust gases, were specified.

Fretting wear in the wheel–axle joint of a wheel set with an automatic gauge change system

Guzowski, Stanisław, Michnej, Maciej
Article
2015
An essential problem in the usage and maintenance of a wheel set with an automatic gauge change system is posed by the wear on the surface of wheel-axle rotary joint. Operational tests have shown that the problem includes fretting wear. This article presents an attempt at explaining this type of wear in a wheel-axle rotary set. The tests were performed on a joint model in which the similarity with the real object in the aspect of dimensions was maintained as well as the character and value of loading. In the description of the fretting wear mechanism in a rotary joint an analogy with wear in a wheel-axle press-fitted joint of a conventional wheel set was shown.

Influence of aging temperature on mechanical properties of the precipitation hardened martensitic Marvac 300 steel

Kłaput, Józef
Article
2015
The simulation and experimental verification of oversteer inducing manoeuvres are presented. A transient state of oversteering in a front-wheel drive car is initiated only by using steering wheel, throttle and brake inputs. The car’s motion is simulated with a single-track dynamic model with a parameterized input that sufficiently reproduces the behaviour of a front-wheel drive Peugeot 106 XSI (group N). The conclusions may be useful in better understanding complex driving techniques and vehicle dynamics that are not commonly described in basic elaborations.

Active system for control of operational parameters of mine diesel locomotive drive

Dobrzaniecki, Piotr
Article
2015
Requirements for better reliability, durability and effectiveness of the suggested means of transportation make the need of using state-of-the-art control systems and the system managing the work of the various vehicle components, such as the engine, brakes, etc. ABS, ASR, ESP and other systems are well known and widely used in the automotive industry. The traction control systems, eliminating the negative phenomena in the transient operation of driving systems are also met in rail vehicles. As there are no such solutions for narrow-gauge railway vehicles, including those used in mining plants, the system for control of operational parameters of the driving system of a mine diesel locomotive is suggested. The method for measurements of vehicle speed is indicated and use of these data in an adaptive system which adapts the operation of the driving system to the current contact conditions between wheel and rail is indicated.