This paper proposes a simplified model of the propulsion system Planar Vertical Take-Off and Landing (DAVP) with disturbance to achieve DAVP, based on experimental data voltage angular velocity perform estimation forces, moments, rotors current, analyze power efficiency results. The DAVP are acquired an Arduino® board at Matlab®/Simulink. block diagram simulation results obtained showed effecti...

We use measurements of swimming bacteria in an optical trap to determine fundamental properties of bacterial propulsion. In particular, we directly measure the force required to hold the bacterium in the optical trap and determine the propulsion matrix, which relates the translational and angular velocity of the flagellum to the torques and forces propelling the bacterium. From the propulsion m...

The global environmental concern and the limited resources of fossil fuels warrant use alternative renewable energy sources. International Maritime Organisation aims to increase efficiency reduce emissions from marine vessels. In this context, in addition conventional propulsion system, application hybrid system (HPS) diesel-electric (DEPS) comes fore. This study analyse electric motors, one HP...

Roller-Walker is a leg-wheel hybrid mobile robot using a passive wheel equipped on the tip of each leg. The passive wheel can be transformed into sole mode by rotating the ankle roll joint when Roller-Walker walks on a rough terrain. This paper discusses energy efficiency of locomotion in wheeled mode. We define a leg trajectory to produce forward straight propulsion and discuss the relationshi...

Current unmanned undersea vehicles (UUVs) are almost exclusively propeller driven designs, which must inherently be optimized for a particular speed, sacrificing low speed manoeuvrability for cruising efficiency. Recently, biomimetic approaches to underwater vehicle propulsion have illuminated the exciting possibilities for performance improvements made possible by emulating fish motion. In par...

The authors completed those propulsion system for microsatellite based on the SAFETY FIRST policy and EFFECTIVE COTS, by the beginning of 2008, which can work as both monoand bi-propellant propulsion system and attain wide-range impulse bit and total impulse by switching the monoand bi-propellant modes. We have been devoting ourselves to develop an upgraded version of the propulsion system sice...

Photofission enables a unique capability for the domain of non-chemical space propulsion. An ultra-intense laser enables the capacity to induce nuclear fission through the development of bremsstrahlung photons. A fundamental architecture and performance analysis of a photofission pulsed space propulsion system through the operation of an ultra-intense laser is presented. A historical perspectiv...