Ing. Mgr. Ladislava Smítková Janků, Ph.D.

Publikace

Enhanced routing algorithm for opportunistic networking: On the improvement of the basic opportunistic networking routing algorithm by the application of machine learning

Rok
2014
Publikováno
ICPRAM 2014 - Proceedings of the 3rd International Conference on Pattern Recognition Applications and Methods. Paris: Academic Science Research, 2014, pp. 771-776. ISBN 978-989-758-018-5. Available from: http://www.scopus.com/record/display.uri?eid=2-s2.0-84902310407&origin=resultslist&sort=plf-f&src=s&st1=Enhanced+routing+algorithm+for+opportunistic&st2=&sid=615D962B926000A023237CA84D4A95DA.FZg2ODcJC9ArCe8WOZPvA%3a130&sot=b&sdt=b&sl=59&s=TITLE-ABS-KEY%2
Typ
Stať ve sborníku
Anotace
The opportunistic communication networks are special communication networks where no assumption is made on the existence of a complete path between two nodes wishing to communicate; the source and destination nodes needn't be connected to the same network at the same time. This assumption makes the routing in these networks extremely difficult. We proposed the novel opportunistic networking routing algorithm, which improves the basic opportunistic networking routing algorithm by application of machine learning. The HMM Autonomous Robot Mobility Models and Node Reachability Model are constructed from the observed data and used in a proposed routing scheme in order to compute the combined probabilities of message delivery to the destination node. In the proposed routing scheme, the messages are coppied between two nodes only if the combined probability of the message delivery to the destination node is higher than the preliminary defined limit value. The routing scheme was developed for the networks of autonomous mobile robots. The improvement about 70% in a network load is reported.

Using Fuzzy Logic to Control an Innovative Active Vehicle Suspension System

Rok
2014
Publikováno
Proceedings of the 18 th International Conference on systems. Athens: WSEAS, 2014, pp. 161-167. Recent Advances in Electrical Engineering Series. ISSN 1790-5117. ISBN 978-1-61804-243-9.
Typ
Stať ve sborníku
Anotace
In this paper, a basic way to fuzzy logic unit utilization on vibration isolation device driver development is briefly described. In this paper, fuzzy logic is used to simulate active suspension of vibrations by linear electric motor on a one-quarter and one-half-car models. Fuzzy approach is one of the frequently used active research and development areas at the present time, particularly in the automobile industry because fuzzy logic can improve vehicle ride comfort and road handling performance. The ride comfort is improved by means of reduction of the body acceleration caused by the car body when road disturbances from uneven road surfaces, pavement points, cargo mass changes, etc. act on the tires of running cars. Velocity and acceleration of the front and rear wheels and undercarriage velocity above the wheels are taken as input data of the fuzzy logic controller. Active forces improving vehicle driving, ride comfort and handling properties are considered to be the controller outputs. The controller design is proposed to minimize chassis and wheels deflection when disturbances are acting on tires of running cars. As a result, a comparison of an active suspension fuzzy control and a spring/damper passive suspension is shown using MATLAB simulations. At the Czech Technical University in Prague various alternative strategies and innovations to classical passive suspension systems improving ride comfort of passengers, providing steering stability, maximizing safety and improving handling properties of vehicles have been researched. In order to improve handling and comfort performance instead of a conventional static spring and damper system, a unique active suspension system has been developed. Certainly there are numerous variations and different configurations of vibration suspension. In this paper, fuzzy logic is used to simulate active linear electric motor suspension of vibrations in a one-quarter and a one-half-car model. It is one of the most active res

Experiments Taken on Energy Management in Active Suspension of Vehicles

Autoři
Rok
2012
Publikováno
International Journal of Circuits, Systems and Signal Processing. 2012, 6(1), 196-203. ISSN 1998-4464.
Typ
Článek
Anotace
The main goal of the paper is to describe H∞ controlled active suspension design with respect to the management of the energy flow distribution. In the time of growing interest in the overall minimization of energy consumption, the presented paper could be taken as a contribution to these efforts. Especially in the application field of automotive vehicles, the energy consumption optimization plays an important role in the design process. In the paper, energy recuperation and management in automotive suspension systems with linear electric motors that are controlled by a designed H∞ controller to generate a variable mechanical force for a car damper is presented. Vehicle shock absorbers in which forces are generated in response to feedback signals by active elements obviously offer increased design flexibility compared to the conventional suspensions with passive elements (springs and dampers). In particular, the paper is focused on experiments with active shock absorber that has been taken on the designed test bed and the way we developed an appropriate input signal for the test bed that as real road disturbance acts upon the vibration absorber and the obtained results are evaluated at the end. Another important point the active suspension design should satisfy is energy supply control that is made via standard controller modification, and which allows changing amount of energy required by the system. Functionality of the designed controller modification was verified taking various experiments on the experiment stand as mentioned in the paper.

On Experiments Taken on The Active Shock Absorber Test Stand

Autoři
Hyniová, K.; Smítková Janků, L.; Honců, J.; Stříbrský, A.
Rok
2012
Publikováno
APPLIED MATHEMATICS in ELECTRICAL and COMPUTER ENGINEERING. New York: WSEAS Press, 2012, pp. 104-109. ISBN 978-1-61804-064-0.
Typ
Stať ve sborníku
Anotace
The main goal of the paper is to describe H∞ controlled active suspension design with respect to the management of the energy flow distribution.As shown in the paper, under certain circumstances linear motors as actuators enable to transform mechanical energy of the vertical car vibrations to electrical energy, accumulate it, and use it when needed. Energy flow control enables to reduce or even eliminate the demands on the external power source. In particular, the paper is focused on experiments with active shock absorber that has been taken on the designed test bed .