Basic Research on Output Power Characteristics of a Shape Memory Alloy Heat Engine : (Twin Crank Heat Engine)

Iwanaga, Hiroyuki; Tobushi, Hisaaki; Ito, Hiromichi

doi:10.1299/jsmea1988.31.3_634

Cited by 18 publications

(33 citation statements)

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“…Energy Conversion in Shape Memory Alloy Heat Engine, Part II It should be pointed out that, since we cannot obtain experimental values for every required parameter from the literature (Iwanaga et al, 1988), for instance, the transformation temperatures of NiTi SMA, some differences between numerical simulation and experiment are expected. Figure 4 shows the curves of output torque versus rotation speed at different water temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…The information provided by Iwanaga et al (1988) is insufficient to provide all the required parameters. Taking this fact into consideration, the simulation results are generally consistent with what were reported in Iwanaga et al (1988).…”

Section: Discussionmentioning

confidence: 99%

“…Thus, (Iwanaga et al, 1988 Figure 2. Operation principle of twin crank SMA heat engine (Iwanaga et al, 1988). …”

Section: Simulation Methodsmentioning

confidence: 97%

“…This heat engine has been experimentally studied by Iwanaga et al (1988). We will use their experimental result as benchmark to verify the proposed model, and in the mean time, to explore the possibility to improve the efficiency of SMA based heat engine by various means.…”

Section: Introduction Smentioning

confidence: 99%

“…

ABSTRACT: In this paper, a theoretical model proposed in Part I (Zhu et al, 2001a) is used to simulate the behavior of a twin crank NiTi SMA spring based heat engine, which has been experimentally studied by Iwanaga et al (1988). The simulation results are compared favorably with the measurements.

…”

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confidence: 99%

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Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Zhu¹,

Huang²,

Liang³

et al. 2001

j intell mater sys struct

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In this paper, a theoretical model proposed in Part I (Zhu et al., 2001a) is used to simulate the behavior of a twin crank NiTi SMA spring based heat engine, which has been experimentally studied by Iwanaga et al. (1988). The simulation results are compared favorably with the measurements. It is found that (1) output torque and heat efficiency decrease as rotation speed increase; (2) both output torque and output power increase with the increase of hot water temperature; (3) at high rotation speed, higher water temperature improves the heat efficiency. On the contrary, at low rotation speed, lower water temperature is more efficient; (4) the effects of initial spring length may not be monotonic as reported. According to the simulation, output torque, output power and heat efficiency increase with the decrease of spring length only in the low rotation speed case. At high rotation speed, the result might be on the contrary.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Thus, (Iwanaga et al, 1988 Figure 2. Operation principle of twin crank SMA heat engine (Iwanaga et al, 1988). …”

Section: Simulation Methodsmentioning

confidence: 97%

Section: Introduction Smentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Zhu¹,

Huang²,

Liang³

et al. 2001

j intell mater sys struct

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Actuator Materials for Environmentally Powered Engines

Spinks

Abbasi

Gautam

et al. 2023

Adv Materials Technologies

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The first solid‐state engine that converted heat into continuous mechanical motion using a thermally responsive actuating material was introduced almost a century ago. These engines used vulcanized rubber where the cyclically heating and cooling of the rubber generate continuous mechanical power in pendulum or wheel type engines. The development of solid‐state heat engines has seen several waves of activity with interest stimulated by the introduction of new actuating materials capable of responding to different environmental stimuli. Opportunities for improved engine outputs are afforded by recently developed artificial muscle materials. A theoretical connection between engine output and the characteristics of the actuator material is developed to compare the performances of vulcanized rubber, shape memory alloys (SMAs), and twisted and coiled polymer (TCP) fiber artificial muscles. It is shown that with an engine designed to suit the actuation performance of TCPs engines powered by the tensile actuation of such materials would exceed the output of SMA heat engines. The properties needed in actuator materials to further enhance engine output are identified and polymer structures that may produce such properties are described.

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Characteristics of a new power generation system with application of a Shape Memory Alloy Engine

Sato

Yoshida

Tanabe

et al. 2008

Electrical Engineering Japan

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SUMMARYIt is necessary to develop new power generation systems using the unused low-temperature thermal energy around 100 °C from the viewpoint of global warming prevention. Even if a shape memory alloy is bent at normal temperature, when it is warmed, it has the character that it returns to the original straight form. Using this character of a shape memory alloy, unused thermal energy will be able to transform into rotation energy, and finally it can change into electric energy. We solved this energy conversion mechanism and the validity of this theory was indirectly verified by experiment. Furthermore, the power generation characteristic of the Shape Memory Alloy Engine was obtained by experiment.

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Basic Research on Output Power Characteristics of a Shape Memory Alloy Heat Engine : (Twin Crank Heat Engine)

Cited by 18 publications

References 0 publications

Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Energy Conversion in Shape Memory Alloy Heat Engine Part II: Simulation

Actuator Materials for Environmentally Powered Engines

Characteristics of a new power generation system with application of a Shape Memory Alloy Engine

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