Development of a PID Based Closed Loop Controller for Shape Memory Alloy Actuators

Roshan, Uditha; Basnayake, B. A. D. J. C. K.; Amarasinghe, Y. W. R.; Wijethunge, Dimuthu; Nanayakkara, Nuwan D.

doi:10.1109/mercon.2018.8421929

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The acquired values were plotted and Figure 10 shows the variation of force with the temperature for the NiTiNOL springs which had the same coil and wire diameter with different transformation temperatures. These forces can be achieved in a controlled manner [11,12].…”

Section: Force Characterization Of the Sma Springmentioning

confidence: 99%

Design and Fabrication of a Minimally Invasive Surgical Device with Customized Shape Memory Alloy Spring Actuator

Roshan¹,

Amarasinghe²,

Dayananda³

2018

JRNAL

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A shape memory alloy (SMA)-based spring actuated gripper (SAG) was designed and developed for facilitating minimally invasive surgeries (MIS). Specifically the research consists of design and development of a SMA spring which acts as the actuator for the gripper. A novel mechanism was also developed to transfer the actuator force to the gripper jaws. Further, the actuator force was characterized by a testing apparatus which uses a full-bridge load cell as the force sensing element. The activation temperature of the SMA actuator was obtained by performing differential scanning calorimetry (DSC) tests on the samples.

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Section: Force Characterization Of the Sma Springmentioning

confidence: 99%

Design and Fabrication of a Minimally Invasive Surgical Device with Customized Shape Memory Alloy Spring Actuator

Roshan¹,

Amarasinghe²,

Dayananda³

2018

JRNAL

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“…Thermomechanical structures of SMAs [6] SMAs are used in biomedical/medical applications, space researches, microelectromechanical systems, aircraft hydraulic systems, semiconductor gas tube connections, dental bracing components, satellite systems, thermostatic devices, on radiator blades of vehicles, and at exhaust outlet controllers, etc. [2,[9][10][11][12]. When choosing an SMA material, one of the most important factors is the compatibility of the material with the environment, thus, they have to have large workout capacity and great deformation capability without losing the capability to turn back to its original shape.…”

Section: Introductionmentioning

confidence: 99%

Measurement of temperature and displacement with NiTi actuators under certain electrical conditions

Toptaş¹,

Çelebi²,

Ersoy³

2021

J. meas. eng.

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In this study, various mechanical behaviors of a shape memory alloy, depending on different thermal and electrical conditions to be used in areas such as biomedical, aerospace and aeronautics. Temperature changes and length change rates under different electrical current values of a shape memory alloy named "nickel titanium", or "nitinol" (NiTi) has been observed. It has been seen that a 0.3 mm diameter wire can generate a force of 25 N while the material extends its linear measurement with a rate of 3.7 mm/s. It is observed that, under diverse constant electrical current values, the displacement and temperature relations of the nickel titanium wire is varying. It has empirically been seen that the nickel titanium alloy actuators are advantageous than their alternatives in terms of the generated strength to weight ratio and shape memory alloy materials can be used as actuators in industrial and biomedical applications.

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“…Due to the hysteresis, the control of flexible structures actuated by shape memory alloys has turned to a challenging task [15]. Various linear control approaches including proportional-integral (PI) [16] and proportional-integral-derivative (PID) [17,18] as well as nonlinear optimal and fuzzy logic controls [19], and variable structure/sliding mode control has been applied on SMA actuated devices. Among these methods, the sliding mode algorithms have shown promising results thanks to their less sensitivity to system parameter variations and noise disturbances [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Deflection Sliding Mode Control of a Flexible Bar Using a Shape Memory Alloy Actuator with an Uncertainty Model

Keshtkar

Poznyak

2020

Applied Sciences

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This paper presents a penalty-based sliding mode control (SMC) law for flexible bar system, which uses shape memory alloy (SMA) as actuator. SMA actuators are lightweight, compact and flexible which facilitate their integration into flexible structures. The proposed control law manipulates SMA current to exert the necessary force for deflecting the flexible bar into the desired state. Numerical simulations demonstrate that this new method can control the one-input, multi-output under-actuated system of the flexible bar efficiently. The mathematical model of the flexible system is obtained using physical discretization. The bar is modeled as a combination of rigid rods connected by joints without elasticity and friction. This model demonstrates the flexibility of the system in an effective way. The numerical simulation illustrates the feasibility of the proposed model for analyzing the oscillations of the system and the effectivness of proposed control algorithms.

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Development of a PID Based Closed Loop Controller for Shape Memory Alloy Actuators

Cited by 6 publications

References 4 publications

Design and Fabrication of a Minimally Invasive Surgical Device with Customized Shape Memory Alloy Spring Actuator

Design and Fabrication of a Minimally Invasive Surgical Device with Customized Shape Memory Alloy Spring Actuator

Measurement of temperature and displacement with NiTi actuators under certain electrical conditions

Deflection Sliding Mode Control of a Flexible Bar Using a Shape Memory Alloy Actuator with an Uncertainty Model

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