A fast and powerful release mechanism based on pulse heating of shape memory wires

Malka, Yoav; Shilo, Doron

doi:10.1088/1361-665x/aa81a3

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Power consumption was higher than specified (5 W per door), but it can be widely reduced by using adequate PID control logics that are able to shape the supply ramp during activation and maintain a constant temperature during cruise. Moreover, as shown by Malka and Shilo in [47] and by Motzki et al in [48], the adoption of suitable voltage and type of signals may further reduce the power absorption. A photo of the experimental setup is shown in Figure 18.…”

Section: Prototyping and Validationmentioning

confidence: 99%

Car Soundproof Improvement through an SMA Adaptive System

et al. 2018

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The work at hand focuses on an adaptive system aimed at improving the soundproof performance of car door seals at specific regimes (cruise), without interfering with the conventional opening and closing operations. The idea addresses the necessity of increasing seal effectiveness, jeopardized by aerodynamic actions that strengthen as the speed increases, generating a growing pressure difference between the internal and the external field in the direction of opening the door, and then deteriorating the acoustic insulation. An original expansion mechanism driven by a shape memory alloy (SMA) wire was integrated within the seal cavity to reduce that effect. The smart material was activated (heated) by using the Joule effect; its compactness contributed to the realization of a highly-integrable and modular system (expanding cells). In this paper, the system development process is described together with the verification and validation activity, aimed at proving the functionality of the realized device. Starting from industrial requirements, a suitable solution was identified by considering the basic phenomenon principle and the allowable design parameters. The envisaged system was designed and its executive digital mock-up (CAD, computer-aided design) was released. Prototyping and laboratory tests showed the reliability of the developed numerical models and validated the associated predictions. Finally, the system was integrated within the reference car. To demonstrate the insulation effect, the experimental campaign was carried out in an anechoic room, achieving significant results on the concept value.

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Section: Prototyping and Validationmentioning

confidence: 99%

Car Soundproof Improvement through an SMA Adaptive System

et al. 2018

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“…Based on their performance capabilities, SMA actuator applications can be classified into fast responding systems [24] [25] [26] [27] [28] and those that move very high loads [29] [30]. The content of this paper deals with combining both topics in a descriptive way, resulting in a mechatronic system for technology demonstration purposes.…”

Section: Introductionmentioning

confidence: 99%

“…The content of this paper deals with combining both topics in a descriptive way, resulting in a mechatronic system for technology demonstration purposes. Dana, Vollach and Shilo give an overview of these high-rate SMA applications [27], which can be used for the development of quick release mechanisms in safety applications [26] or contactors as prominent practical examples. In both cases, the SMA actuator must provide high forces in the range of several micro-or milliseconds to either pull a safety pin and activate a brake-/blocking mechanism or disconnect/break a highvoltage and high-current electrical circuit.…”

Section: Introductionmentioning

confidence: 99%

High-Power Shape Memory Alloy Catapult Actuator for High-Speed and High-Force Applications

Molitor¹,

Britz

Motzki

2022

IEEE Access

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Nickel-Titanium (NiTi) based shape memory alloy (SMA) wires are already often used in industrial actuator applications. Their high energy density allows to build light-weight actuator systems with high forces using small installation spaces. Combined with the biocompatibility of NiTi, a huge field of applications can be covered by SMA actuated systems. In systems like emergency brakes or switch disconnectors, which require high forces as well as high actuation speed, the high-power capability of NiTi actuators is exploited. The presented work details the development and characterization of a giant power catapult demonstrator, that combines the high-speed and high-force capability of SMA wires. To illustrate the vast force, speed, and power potential of SMA wires, a bowling ball is launched from its resting position vertically into the air using SMA wires. For demonstration purposes a target altitude for the bowling ball of 500 mm is chosen. With the height and the overall accelerated mass given, an actuation force F ≅ 920 N is needed. The instantaneous energy release from the designed power source results in the targeted flight height and an overall peak power of P ≅ 0.5 MW.

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“…In work [5] it is suggested a way to raise the frequency of an SMA actuator up to 3 Hz by realizing an incomplete strain recovery. A fast release mechanism, which functioning is based on the electric pulse actuation of a SMA wire is described in work [6]. It is reported that pulse heating of an SMA wire makes it possible to produce the required 6 mm displacement during 1.6 ms.…”

Section: Introductionmentioning

confidence: 99%

Strain Recovery by TiNi Element Under Fast Heating

Volkov

Volkova

2018

Shap. Mem. Superelasticity

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A theoretical and experimental study of strain recovery under fast heating of a shape memory alloy (SMA) rod preliminarily stretched in the martensitic state is carried out. Two theoretical models are considered: instantaneous heating and heating with temperature variation during a finite time. In the first case it is supposed that the straight SMA rod experiences an instantaneous reverse martensitic transformation, and in the second the transformation is supposed to progress at a rate corresponding to the temperature rate. Analytical expression for the time dependence of the rod free end displacement is obtained. In the experiment a wire specimen made of titaniumnickel SMA was heated by a short impulse of electric current. The variation of the specimen length in time was registered. Thus, it has been shown that the minimum operation time of an SMA actuator (time needed for the strain recovery) can be reduced to 20 µs. Comparison of the theoretical results with the experimental ones leads to the conclusion that the displacement variation in time is controlled by the rate of heating and the inertial properties of the specimen. The incubation time of the martensitic transformation on the micro-scale apparently is estimated as less than 1 µs.

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A fast and powerful release mechanism based on pulse heating of shape memory wires

Cited by 12 publications

References 26 publications

Car Soundproof Improvement through an SMA Adaptive System

Car Soundproof Improvement through an SMA Adaptive System

High-Power Shape Memory Alloy Catapult Actuator for High-Speed and High-Force Applications

Strain Recovery by TiNi Element Under Fast Heating

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