Development of dynamically artificial flowers driven by shape memory alloy and pulse width modulation

2015 ◽  
Author(s):  
C. H. Pan ◽  
Y. B. Wang ◽  
H. Y. Pan
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Artificial Flowers

A Biomimetic Squid Funnel Actuated by Shape Memory Alloy Wires

2011 ◽  
Vol 50-51 ◽  
pp. 219-223
Author(s):  
Zhen Long Wang ◽  
Fei Gao ◽  
Yu Kui Wang ◽  
Cheng Guo
Keyword(s):  
Experimental Investigation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Duty Cycle ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Bending Angle ◽  
Direction Control ◽  
The Relationship

Inspired by the squid’s funnel which can bend flexibly, a kind of biomimetic squid funnel actuated by shape memory alloy (SMA) wires was developed for controlling the jet direction in this article. With the application of Pulse Width Modulation (PWM) technique, experimental investigation was conducted. And the results show that, the bending angle of the biomimetic squid funnel can be controlled by changing PWM duty cycle and the final stable resistance of SMA wire decreases while the duty cycle is increased. The relationship between the banding angle of the biomimetic squid funnel and the resistance of SMA wire is approximately inverse linear. The feasibility of jet direction control with the biomimetic squid funnel was verified by a simulated jetting experiment.

Control of Shape Memory Alloy Actuators Using Pulse Width Pulse Frequency (PWPF) Modulation

2001 ◽  
Author(s):  
G. Song ◽  
N. Ma
Keyword(s):  
Energy Consumption ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Pulse Width ◽  
Pulse Frequency ◽  
Open Loop ◽  
Parameter Analysis ◽  
Pd Controller ◽  
Sma Actuator ◽  
Control Accuracy

Abstract This paper presents the design and experimental results of control of an SMA actuator using PWPF modulation to reduce the energy consumption by the SMA actuator. An SMA wire test stand is used in this research. Based on results of open-loop testing of the SMA wire actuator and parameter analysis of the PWPF modulator, a PWPF modulator is designed to modulate a Proportional plus Derivative (PD) controller. Experiments demonstrate that control of the SMA actuator using PWPF modulation effectively save actuation energy whiling maintaining same control accuracy as compared to continuous PD control.

scholarly journals Development of Miniature Stewart Platform Using TiNiCu Shape-Memory-Alloy Actuators

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Alaa AbuZaiter ◽  
Ee Leen Ng ◽  
Suhail Kazi ◽  
Mohamed Sultan Mohamed Ali
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Pulse Width Modulation ◽  
Stewart Platform ◽  
Sma Actuators ◽  
Tilting Angle ◽  
Sma Actuator ◽  
Manipulator Robot ◽  
Tinicu Shape Memory Alloy ◽  
A Current

A Stewart platform is a parallel manipulator robot that is able to perform three linear movements, lateral, longitudinal, and vertical, and three rotations, pitch, yaw, and roll. This paper reports a 30 mm × 30 mm × 34 mm miniscale Stewart platform using TiNiCu shape-memory-alloy (SMA) actuators. The proposed Stewart platform possesses various advantages, such as large actuation force and high robustness with a simple mechanical structure. This Stewart platform uses four SMA actuators and four bias springs and performs a linearz-axis movement and tilting motions. The SMA actuators are activated by passing a current through the SMA wires using a heating circuit that generates a pulse width modulation (PWM) signal. This signal is varied to control the level of the displacement and tilting angle of the platform. The tilting direction depends on the SMA actuator that is activated, while all four SMA actuators are activated to achieve the linearz-axis movement. Each SMA actuator exerts a maximum force of 0.6 N at PWM duty cycle of 100%. The fabricated miniature Stewart platform yields a full actuation of 12 mm in thez-axis at 55°C, with a maximum tilting angle of 30° in 4 s.

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