In this paper, a novel electromagnetic pendulum energy harvester with counterweight is designed to harvest low frequency vibration from ocean waves for unmanned surface vehicles. This design the first of its kind, allowing natural resonant be reduced without increasing length, thereby maintaining high power output at lower frequencies than previously possible pendulums same size. Implementing mechanical rotation rectifier (MRR) system conversion efficiency, can provide multi-watt-level 1 Hz,...

This paper proposes a novel pendulum energy harvester design for converting of low frequency ambient vibration, such as that found in unmanned surface vehicles (USVs) due to ocean waves, into usable electrical energy. The primary novelty this is the mechanical rotation rectifier (MRR) system, which able improve on existing designs through use spur gears and sprag clutches capable handling significant torque, an arrangement easily scalable larger devices. Using minimal number offset gears,...

This work presents a pendulum kinetic energy harvester with unique mechanical motion rectifier design which uses string-driven (SDR) just single clutch to convert bidirectional input oscillation of the unidirectional rotation DC motor produce electricity. Unlike typical rectifiers use two clutches, this rectification system has no gearing, minimising complexity and weight for harvester. Through experimentation, was found have normalised average power output 4.39 W/g2 density 5.85 W/g2/kg...

This paper presents the integration of a novel mechanical torsion spring regulator into pendulum energy harvester system. was designed to provide same voltage-smoothing benefits flywheel without start-up issues caused by increasing system inertia. In addition, introduction between input and output stages device acts as buffer for any sudden impacts, which not only allows from such events be fully absorbed dissipated slowly through but significantly reduces torque stress fluctuation on...

Two studies examined differences in children's social immediacy tendencies expressed through interpersonal distance and touching. It was predicted that Mexican-Americans would space closer touch more frequently than whites. Study 1 showed among 40 second graders 20 did significantly Among eighth the ethnic difference disappeared. 2 indicated greatest tactual behavior occurred for Mexican-American females (16 boys, 16 girls). Extensive measures were taken to avoid a number of confounds...

A Programmable Power Processor (P <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ) has been developed by NASA/Marshall Space Flight Center for application in future large space power systems. The P is capable of operation over a wide range input voltage (26 to 375 Vdc) and output (24 180 Vdc). peak capability 18 kW (180 V at 100 A). characteristics the can be programmed any and/or current level within limits processor may controlled as...

A Programmable Transformer Coupled Converter (PTCC) is being developed by NASA/Marshall Space Flight Center for application in future large space power systems. The PTCC uses an internal microprocessor to control the output characteristics of its three Cuk integrated magnetics type stages which have a combined capability 5.4 kW (30V at 180A). Details design trade-offs and test results are presented.

A programmable transformer coupled converter (PTCC) is being developed by NASA/Marshall Space Flight Center for application in future large space power systems. The PTCC uses an internal microprocessor to control the output characteristics of its three Cuk integrated magnetics type stages which have a combined capability 5.4 kW (30 V at 180 A). Details design trade-offs and test results are presented.

This paper presents a discussion of modular, multiple output power converter developed for wide range space applications and selected as NASA standard hardware. The unique packaging concept, advanced heat removal techniques, electrical design characteristics are presented in detail.