Temat: steer - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Validation process for ESP based electric steering system
Autorzy:: Gubovits, A.
Bari, G.
Powiązania:: https://bibliotekanauki.pl/articles/242354.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle
steer
brake
ESP
model
Opis:: Stability problems of vehicles, especially commercial vehicles, get more and more attention with the increasing traffic load of the roads. The development of infrastructure can not follow the demands for the increasing traffic and it result in increasing number of accidents. The society can not accept this situation and it raises higher and higher demand on the active safety of the vehicles. This demand resulted that the brake system based drive stability systems are available today and in some cases are obligatory. If the driver demanded vehicle motion (which is calculated on the basis of a reference vehicle model) differs from the measured vehicle motion, the system applies a moment using the brakes to force the vehicle to move on the desired path. However the brake is activated without the direct command from the driver, the system can not be considered as an autonomous driver assistant system, because it just supports the driver to reach his demand. The driver is apart of the control hop completely. The target of the paper is to extend the drive stability system with active steering intervention. The new generation steering systems with the help of a superimposing gear can manipulate the steering angle, and so they can manipulate the acting forces of the tire contact point. So the new generation of the ESP requires the appropriate steering system. As apart of the current development the adequacy of the model is checked by a validation process with a continuous feedback.
Źródło:: Journal of KONES; 2009, 16, 2; 159-166
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Hydraulic circuit control of a steer by wire system
Autorzy:: Voženilek, R.
Maly, M.
Brabec, P.
Powiązania:: https://bibliotekanauki.pl/articles/245341.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: steer by wire
hydraulic circuit
control
Opis:: The future of cars will be connected with "by-wire" systems. The Technical University of Liberec, Department of vehicles and Engines has developed a design of testing equipment for directional control system testing. The objective of the newly designed equipment is to incorporate a wheel with a real tire and a flexible mounting of axle components. The paper describes properties and control of the hydraulic circuit consisting of two double-acting engines with a unilateral piston rod and two proportional valves (Parker D1FP). Each of the front axle wheels is controlled separately. The paper illustrates relationships andpotential of steer-by-wire systems at the experimental equipment. The safe and easy control of a vehicle undoubtedly poses significant requirements. Satisfying them and improving the design to enhance the vehicle's stability have always belonged to the primary objectives of designer s. Consequently, the chassis characteristics, the mechanical features of wheel suspensions, the quality of air suspensions, but also speed control (including brakes) and the vehicle 's directional control have always been emphasised. The objective of the paper was to design a steer-by-wire directional control mechanism with a suitable arrangement. The comparison focuses on various design options to arrange the action members (actuators) of this mechanism.
Źródło:: Journal of KONES; 2009, 16, 4; 477-483
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Action of force in steering mechanisms of vehicles in an experimental laboratory establishment
Autorzy:: Brabec, P.
Maly, M.
Voženilek, R.
Powiązania:: https://bibliotekanauki.pl/articles/242204.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: steer by wire
experimental laboratory establishment
vehicle axle
Opis:: The safe and stable control ofa vehicle undoubtedly belongs to one of the most important requirements that relate to the vehicle 's design and operation. Consequently, in the near future, so called steer-by-wire systems could become the next stage in the control system development. A number of new, modern vehicles presented by car makers at important car shows definitely show how topical the issue is. If we want to create a design for this steering system, we have to know the action offorce very well. An experimental laboratory establishment for measuring and optimizing the steering system of vehicles was developed in our centre. The testing equipment is made of aluminium sections enabling the equipment to be quickly adapted to various vehicles ' axles and tyres. An exchangeable mat located under a tyre enables the system to create behaviour simulation for various surfaces with a different coefficient of adhesion. A sliding way assisted by a hydraulic jack under a tyre allows a change in axle load for example in accordance with the vehicle 's occupancy. A force sensor will be positioned between the jack and the mat to monitor the load adjustment. The testing stand design enables us to determine responses and behaviour of the system including tyres.The safe and stable control ofa vehicle undoubtedly belongs to one of the most important requirements that relate to the vehicle 's design and operation. Consequently, in the near future, so called steer-by-wire systems could become the next stage in the control system development. A number of new, modern vehicles presented by car makers at important car shows definitely show how topical the issue is. If we want to create a design for this steering system, we have to know the action offorce very well. An experimental laboratory establishment for measuring and optimizing the steering system of vehicles was developed in our centre. The testing equipment is made of aluminium sections enabling the equipment to be quickly adapted to various vehicles ' axles and tyres. An exchangeable mat located under a tyre enables the system to create behaviour simulation for various surfaces with a different coefficient of adhesion. A sliding way assisted by a hydraulic jack under a tyre allows a change in axle load for example in accordance with the vehicle 's occupancy. A force sensor will be positioned between the jack and the mat to monitor the load adjustment. The testing stand design enables us to determine responses and behaviour of the system including tyres.
Źródło:: Journal of KONES; 2009, 16, 3; 55-62
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Test VDA ISO TR3888 on the testing bench for steer by wire system
Autorzy:: Voženilek, R.
Brabec, P.
Maly, M.
Powiązania:: https://bibliotekanauki.pl/articles/246243.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: steer by wire
experimental laboratory establishment
vehicle axle
Opis:: The Technical University of Liberec, Department of Vehicles and Engines, has developed a design of a testing bench which would enable the testing of directional control systems. The objective of the newly designed equipment is to incorporate a real tyre as well as aflexible mounting of the axle components into the tested system. Future of car s will be connected with systems of type steer by wire. This system need to be testing on the testing bench before real test in the car. One method for assessing can be investigation control deviation during test VDA ISO TR3888. The paper will describe measurement of the real car with conventional directional control during test VDA ISO TR3888 and simulation of the system steer by wire on the testing bench. The experimental steer by wire system forms hydraulic circuit with two double-acting hydraulic cylinders with a unilateral piston rod and two proportional valves Parker D1FP. Every wheel front of axle is control alone. The PID regulators were usedfor control of the positioning action. In particular, the testing bench for the testing of steering at zero angular speed of wheels, VDA ISO TR 3888 tests on the testing bench are presented in the paper.
Źródło:: Journal of KONES; 2010, 17, 4; 561-565
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Gurney flap and T-strip alternativesin application to typical aircraft steer surface
Autorzy:: Sieradzki, A.
Powiązania:: https://bibliotekanauki.pl/articles/247018.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: CFD
steer
stabilizer
Gurney flap
T-strip
stabilizator
listwa Gurneya
Opis:: Classic Gurney flap and double Gurney flap (called T-strip) are well-researched trailing edge modifications used in aerospace engineering. However, one of the inevitable effects of their use is the aerodynamic drag increase at low lift conditions, concerned as the major drawback of these solutions. This article presents Gurney flap and T-strip passive alternatives, which guarantee similar advantages in terms of e.g. lift enhancement, but without significant drag increase. Their aerodynamic analysis was performed on the application case of a typical symmetrical aircraft stabilizer with movable steer. Both solutions, consisting of plates nearly parallel to the direction of flow, were modelled as two-dimensional cases and CFD calculations were performed for specified range of angles of attack and steer deflections. Obtained aerodynamic characteristics allowed assessing the influence of selected modifications on the stabilizer effectiveness, as well as on hinge moment characteristics. The flow pattern changes in the presence of analysed devices were also investigated. In this way, performed analysis provided valuable information about the advantages and disadvantages of using of such devices in comparison to classic Gurney Flap and double Gurney flap. The results showed that using proposed solutions gives the possibility of significant reduction of the aerodynamic drag of the whole stabilizer at low lift conditions, while still maintaining favourable lift characteristics.
Źródło:: Journal of KONES; 2018, 25, 1; 347-354
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Directional dynamics problems of an articulated frame steer wheeled vehicles
Autorzy:: Dudziński, P.
Skurjat, A.
Powiązania:: https://bibliotekanauki.pl/articles/248101.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: articulated frame steer vehicles
snaking
experimental and simulation tests
steering system stiffness
dynamic properties of multi-dimensional tyres
Opis:: One of the current trends in industrial wheeled vehicles is to increase their mobility, i.e. the ability to travel at speeds ranging from 50 even up to 100 km/h, e.g. military engineering machines. As a result of the high demands put on such vehicles several previously unknown problems with their dynamics have come to light. The paper presents the results of experimental and MSC Adams view simulation tests for snaking movement of an articulated frame steer vehicle such as bucket loader. The model precisely accounts for machine units’ mass and geometry along with their inertia. Additionally, the model includes hydrostatic steering gear submodel and its geometry and the submodel of a drive train with dynamic properties of multi-dimensional tyres as well. Experimental and virtual tests demonstrated that directional dynamics of articulated frame steer wheeled vehicles are largely affected by total (equivalent) steering gear torsional stiffness, dynamic properties of largesize tyres and type of vehicle’s wheel drive. Simulation studies used the results of experimental studies whereby the simulation outcome provides interesting and original guidelines for articulated frame steer vehicles manufacturers.
Źródło:: Journal of KONES; 2012, 19, 1; 89-98
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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