Wyniki wyszukiwania - BazTech

1

Multiplicity results for an impulsive boundary value problem of p(t)-Kirchhoff type via critical point theory

Mokhtari A., Moussaoui T., O'Regan D.

Opuscula Mathematica

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2016

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Vol. 36, no. 5

631--649

EN

In this paper we obtain existence results of k distinct pairs nontrivial solutions for an impulsive boundary value problem of p(t)-Kirchhoff type under certain conditions on the parameter λ.

2

An Empirical Survey on the Role of Human Error in Marine Incidents

Mokhtari A., Khodadadi H. R.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2013

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Vol. 7, no. 3

363--367

EN

Error is a part of human. Despite that organizations are trying to reduce error to the zero level, this goal is unachievable. As far as human operation is taking place in a complicated environment, error will occurred, and its possibility would be increased under the conditions of stress, extra loading work, and fatigue. One of the most important transportation modes is marine transportations. The sea is an unsafe place that kills many by a simple event. Every year there are thousands of marine accidents that result in injuries, casualties, marine pollutions and also massive financial loss. To reduce the accidents, there should be more attention to the factors such as suitable training of human resource, proper implementation of national and international laws and regulations, vessels and the equipment on board them, port facilities, and also the utilities for marine search and rescue. In this research 1816 marine accidents have been studied in five Iranian shipping companies. 17 factors are known to be effective in occurrence of human error in these accidents. Four factors of the most influence are negligence, poor training, inadequate tools, and lack of skill and experience.

3

Sliding Mode Control Based on Adaptive Backstepping Approch for a Quadrotor Unmanned Aerial Vehicle

Kacimi A., Mokhtari A., Kouadari B.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 6

188-193

EN

A sliding mode control based on adaptive backstepping approch, is developped respectively in order to synthesise tracking errors and to ensure Lyapunov stability, handling of all system nonlinearities and desired tracking trajectories. Under ground effects and wind disturbances, the body inertia becomes badly known , and non parametric uncertainties are considered in the system model. Dynamic modelling of quadrotor takes into account the high-order nonholonomic constraints, that are considered here in order to test this new control scheme on a model that takes into account the various physical phenomenas, which can influence the dynamics of a flying structure. Finally simulation results are provided to illustrate the performances of the proposed controller.

PL

Przedstawiono system sterowania ślizgowego z modulem typu backstepping w zastosowaniu do bezzalogowego pojazdu powietrznego (helikoptera). Zaproponowany system sterowania pozwala na zmniejszenie błędu trasy i zapewnia stabilność z uwzględnieniem nieliniowości, zmian wiatru i inercji pojazdu. Model dynamiczny uwzglednia różne możliwe fizyczne zjawiska.