Thrust generation and scaling parameters for flapping flexible wings are investigated using an integrated framework of computational fluid dynamics and structural dynamics solvers. To explore the influences of the density ratio and the effective stiffness on the thrust generation, surrogate models have been generated for a flapping thin isotropic flat Zimmerman wing in still air at = 1.5×10. Ti...

This paper focused on evaluation of machining parameters influencing thrust force during drilling of Al–SiC–Gr metal matrix composites using multifaceted carbide drills. There are three machining parameters i.e. Spindle speed, Feed rate, Drill diameter. Experiments are conducted on a vertical machining centre using Taguchi design of experiments. Taguchi orthogonal array is designed with three l...

It is shown analytically that the thrust from a simple plasma thruster (in the absence of a magnetic field) is given by the maximum upstream electron pressure, even if the plasma diverges downstream. Direct thrust measurements of a thruster are then performed using a pendulum thrust balance and a laser displacement sensor. A maximum thrust of about 2 mN is obtained at 700 W for a thruster lengt...

Angular maneuvering scheme along with standard flight operations such as taking-off, landing and hovering is proposed for a quadcopter with indoor or outdoor flying capabilities. This is achieved by simultaneously controlling the speed of the four rotors in order for the quadcopter to attain the correct orientation. The total thrust is determined using the inputs of altitude, pitch and roll ang...

Speed and position control systems for marine vehicles have been subject to an increased focus with respect to performance and safety. An example is represented by drilling operations performed with semi submersible rigs where the control of position and heading requires high accuracy. Drifting from the well position could cause severe damage to equipment and environment. Also, the use of under...

During the past decade, polymer nanocomposites have emerged relatively as a new and rapidly developing class of composite materials and attracted considerable investment in research and development worldwide.Direct machining of polymers can be an option for personalized products and for manufacturing product samples. To obtain high quality products and reduce machining costs, it is very importa...

Pulsed detonation engines have the potential to provide thrust over a wide operating range for a fraction of the cost of conventional turbine engines. These promised returns have given rise to several vigorous research programs in academia, industry, and government labs. To capture the ultra-fast events comprising a detonation wave, researchers are forced to use megahertz range data acquisition...

This chapter demonstrates how to leverage the Thrust parallel template library to implement high-performance applications with minimal programming effort. Based on the C++ Standard TemplateLibrary (STL), Thrust brings a familiar high-level interface to the realm of GPU Computing whileremaining fully interoperable with the rest of the CUDA software ecosystem. Applications written...

b number of arc segments within curve CF thrust coefficient CF;w weighted thrust coefficient Cx nozzle length-weight coefficient E numerical error k turbulent kinetic energy, m s−2 L total contour axial length, m Ma Mach number P static pressure, Pa r radius, m TW thrust-to-weight ratio x horizontal distance, m y vertical distance, m ε turbulent dissipation rate, m s−3 θ angle, deg ω specific d...

A torsional-type thrust stand has been designed and built to test Pulsed Plasma Thrusters (PPTs) in both single shot and repetitive operatingmodes. Using this stand, momentum per pulse was determined strictly as a function of thrust stand deflection, spring stiffness, and natural frequency. No empirical corrections were required. The accuracy of the method was verified using a swinging impact p...