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Wyświetlanie 1-3 z 3
Tytuł:
The preliminary design of multipurpose engineering machine
Autorzy:
Trzciński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/242610.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engineering machine
working machine
loader
stability
preliminary design
multipurpose machines
Opis:
The preliminary design of a multipurpose engineering machine on the wheeled chassis was presented in the paper. The machine meets a series of specific requirements such as: off-road prowess, ability of movement with high speed on hard-surface roads, limited weight and dimensions at the maintaining of great hoisting capacity. These requirements were adjusted to the present character of warfare and that is why the machine construction deviates from classic working machines being used in the civil sector. The meeting of defined requirements required the development of innovative methods. The solution aiming at the increasing the stability of the machine by the application of using a sliding drive unit was described. As a result of that, the increased capacity and efficiency of mined materials were obtained. Additionally, the system of two telescopic arms was applied, so that the efficiency was improved by the shortening of machine working cycles and it is possible to change the length of arms as well as both telescopic arms were placed on the rotating body achieving in such a manner the big workspace for arms. The 3D model of a multipurpose engineering machine and model with rear mounted drive unit and raised and extended arms are presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 1; 667-670
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control effectiveness comparison of wheel loaders longitudinal vibrations by means of passive and active vibration stabilisers
Autorzy:
Kosiara, A.
Powiązania:
https://bibliotekanauki.pl/articles/244576.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
wheel loader
longitudinal oscillations
active stabiliser
passive stabiliser
state controller synthesis
Opis:
When wheel loaders move with velocity higher than 10 km/h, they are subject to intense longitudinal vibrations. These vibrations are experienced particularly unpleasantly by an operator. Passive vibration stabilisers are used for controlling their intensity. They make outrigger's support more flexible so that outrigger's vibrations counteract the wheel loader's longitudinal oscillations when moving. Unfortunately, the effectiveness of passive stabilisers is insufficient and at present more effective alternative means are sought. One of the solutions for angular longitudinal vibrations includes the replacement of passive stabilisers with active stabilisers. Nevertheless, the possibility of active stabilisers’ use in minimising longitudinal vibrations requires a scientific assessment. Hence, this paper, meeting the needs, includes calculations, which allow for comparing the effectiveness of active and passive stabilisers in minimising the vibrations of a typical wheel loader. Active stabilisers, which are the subject of the study, worked based on state controller, whose synthesis was carried out on the basis of optimal control linear theory with square quality indicator. The calculations were conducted on linear models under stochastic road excitations. Stochastic excitations were defined by means of power spectral density of road's unevenness. Active stabiliser's effectiveness was analysed, both for a loader moving with an empty bucket, and for a loader transporting a 3-tonne load. In order to facilitate the analysis of the results obtained, vibrations minimising quality indicator was introduced, defined as a root of a vehicle longitudinal deflections power.
Źródło:
Journal of KONES; 2011, 18, 1; 287-294
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A modular low- bed semi-trailer for transportation of machines and other heavy and big loads
Autorzy:
Koszałka, G.
Niewczas, A.
Kaczor, M.
Taratuta, L.
Głowacz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/245791.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
road transport
oversize and heavy loads
low-loader
steering system
strength analysis
FEM
Opis:
The paper presents the assumptions made and solutions used in a newly designed low-bed semi-trailer for the transportation of heavy and oversized loads, especially heavy self-propelled road machinery. During the design phase, special attention was paid to the versatility of the semi-trailer. The semi-trailer consists of 4 main modules: a hydraulic removable gooseneck allowing for coupling the semi-trailer to a tractor unit, an extendable low bed, a 2- axle bogie and a 3-axle bogie. The modules can be combined in different ways to create different configurations of the semi-trailer. Owing to that, the carrying capacity of the semi-trailer can be easily matched to the equipment carried. Depending on the current needs, the semi-trailer can have 2, 3 or 5 axles, a payload from 28 to 65 tons, and a length from 13.2 to 20.1 m. Wheeled and caterpillar vehicles can drive onto the lowbed from the front, after the gooseneck has been detached. The length and width of the bed can be adjusted within the range of 2 and 0.6 m, respectively. An important advantage of this semi-trailer is the fact that in a 2-axle configuration it meets the regulations for standard trailers and can be driven in public roads and carry normal loads without a special permission. Thanks to the fact that all its wheels are steered and controlled by a hydraulic steering system, the semi-trailer has very good manoeuvrability despite its long length. The semi-trailer meets rigorous safety demands – it is equipped with a braking system with ABS/EBS, an advanced load fixing system, marking and lighting systems and others. Research and development experiments performed during the design process, among others those concerning the steering system and optimization of the supporting structure of the semi-trailer using FEM analysis, are characterized in this paper.
Źródło:
Journal of KONES; 2013, 20, 3; 237-244
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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