High-energy orbit refueling for orbital transfer vehicles

1987 ◽  
Vol 24 (6) ◽  
pp. 518-522 ◽  
Author(s):  
Bruce P. Dunn
Keyword(s):  
High Energy ◽  
Orbital Transfer ◽  
Energy Orbit

Investigations of a Stiffness Tunable Nonlinear Vibrational Energy Harvester

2014 ◽  
Vol 14 (08) ◽  
pp. 1440023 ◽  
Author(s):  
Dongxu Su ◽  
Kimihiko Nakano ◽  
Rencheng Zheng ◽  
Matthew P. Cartmell
Keyword(s):  
Energy Harvesting ◽  
Permanent Magnets ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Duffing Oscillator ◽  
Experimental Tests ◽  
High Energy ◽  
Practical Implementation ◽  
Energy Harvesting Devices ◽  
Energy Orbit

The recent potential benefit of nonlinearity has been applying in order to improve the effectiveness of energy harvesting devices. For instance, at relatively high excitation levels, both low and high-energy responses can coexist for the same parameter combinations in a hardening type Duffing oscillator, and this provides a wider bandwidth and a higher energy harvesting effectiveness under periodic excitations. However, frequency or amplitude sweeps of the excitation must be used in order to reach a desirable high-energy orbit, and this gives a limitation on practical implementation. This paper presents a stiffness tunable nonlinear vibrational energy harvester which contains a moving magnetic end mass attached to a cantilever beam, whose nonlinearity emerges from the interaction forces with two neighboring permanent magnets facing with opposing poles. The motivating hypothesis has been that the jump from the low-energy orbit to the high-energy orbit can be triggered by tuning the stiffness of the system without changing the frequency or the amplitude of the excitation. Theoretical investigations show a methodology for tuning stiffness, and experimental tests have validated that the proposed method can be used to trigger a jump to the desirable state, and hereby this can broaden the bandwidth of the energy harvester.

scholarly journals Stabilising high energy orbit oscillations by the utilisation of centrifugal effects for rotating-tyre-induced energy harvesting

2018 ◽  
Vol 112 (14) ◽  
pp. 143901 ◽  
Author(s):  
Yunshun Zhang ◽  
Rencheng Zheng ◽  
Kimihiko Nakano ◽  
Matthew P. Cartmell
Keyword(s):  
Energy Harvesting ◽  
High Energy ◽  
Energy Orbit

scholarly journals Stabilisation of the high-energy orbit for a non-linear energy harvester with variable damping

2015 ◽  
Vol 230 (12) ◽  
pp. 2003-2012 ◽  
Author(s):  
Dongxu Su ◽  
Rencheng Zheng ◽  
Kimihiko Nakano ◽  
Matthew P Cartmell
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
High Energy ◽  
Low Energy ◽  
Additional Energy ◽  
Non Linear ◽  
In Series ◽  
Improved Performance ◽  
Non Linear Oscillator ◽  
Energy Orbit

The non-linearity of a hardening-type oscillator provides a wider bandwidth and a higher energy harvesting capability under harmonic excitations. Also, both low- and high-energy responses can coexist for the same parameter combinations at relatively high excitation levels. However, if the oscillator’s response happens to coincide with the low-energy orbit then the improved performance achieved by the non-linear oscillator over that of its linear counterpart, could be impaired. This is therefore the main motivation for stabilisation of the high-energy orbit. In the present work, a schematic harvester design is considered consisting of a mass supported by two linear springs connected in series, each with a parallel damper, and a third-order non-linear spring. The equivalent linear stiffness and damping coefficients of the oscillator are derived through variation of the damper element. From this adjustment the variation of the equivalent stiffness generates a corresponding shift in the frequency–amplitude response curve, and this triggers a jump from the low-energy orbit to stabilise the high-energy orbit. This approach has been seen to require little additional energy supply for the adjustment and stabilisation, compared with that needed for direct stiffness tuning by mechanical means. Overall energy saving is of particular importance for energy harvesting applications. Subsequent results from simulation and experimentation confirm that the proposed method can be used to trigger a jump to the desirable state, thereby introducing a beneficial addition to the performance of the non-linear hardening-type energy harvester that improves overall efficiency and broadens the bandwidth.

scholarly journals Combining sustainable stochastic resonance with high-energy orbit oscillation to broaden rotational bandwidth of energy harvesting from tire

AIP Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 015011
Author(s):  
Yunshun Zhang ◽  
Yingfeng Cai ◽  
Xiaopeng Teng ◽  
Rencheng Zheng ◽  
Kimihiko Nakano
Keyword(s):  
Energy Harvesting ◽  
Stochastic Resonance ◽  
High Energy ◽  
Energy Orbit

A bistable piezoelectric oscillator with an elastic magnifier for energy harvesting enhancement

2016 ◽  
Vol 28 (3) ◽  
pp. 392-407 ◽  
Author(s):  
Guang-Qing Wang ◽  
Wei-Hsin Liao
Keyword(s):  
Energy Harvesting ◽  
Effective Means ◽  
High Energy ◽  
Open Circuit ◽  
Lumped Parameter Model ◽  
Vibration Level ◽  
Restoring Force ◽  
Output Displacement ◽  
Piezoelectric Harvester ◽  
Energy Orbit

Bistable oscillator has been recognized as an effective means by which to improve the linear resonant energy harvesting performance for its unique double-well restoring force potential. As oscillating in a high-energy orbit, the oscillator should be located at a distance from one stable to the other with a much higher velocity or acceleration. However, the vibration level in environment would be too low to provide the oscillator with a larger velocity to overcome the potential well barrier. This article is focused on the enhancement of a bistable piezoelectric oscillator with an elastic magnifier for high-energy orbit harvesting. The elastic magnifier positioned between the bistable piezoelectric oscillator and the base is to amplify the base vibration level in order to provide the bistable piezoelectric harvester with large movement. A 2-degree-of-freedom nonlinear lumped-parameter model of the bistable piezoelectric harvester with an elastic magnifier (bistable piezoelectric harvester + elastic magnifier) is derived to exhibit the large-amplitude periodic oscillation behaviors. With the comparison of the electromechanical responses obtained from theory and experiment, the results show that the output displacement, tip velocity, and harvesting voltage under open-circuit condition of the bistable piezoelectric harvester + elastic magnifier configuration are 15 mm, 1500 mm s−1, and 13 V, respectively, while those of the only bistable piezoelectric harvester configuration are 1 mm, 120 mm s−1, and 2 V under the excitation level of 8.69 m s−2 and frequency of 16 Hz. It is verified that the bistable piezoelectric harvester with an elastic magnifier can generate larger output performance than that of the bistable piezoelectric harvester without elastic magnifier at several excitation frequencies and levels.

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