Development of Shape Memory Alloy Spring for Oil Flow Control Valve in Clutch System

Ito, Haruki; Ishikawa, Akinari; Ochiai, Chiaki; Yoshiro, Shugo

doi:10.4271/960979

Cited by 1 publication

(1 citation statement)

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“…An SMA object can experience a reversible crystalline phase transformation, which enables the SMA object to recover its original heat-treated shape (up to 6% strain) when heated above a critical transformation temperature or to generate high recovery stresses (>500 MPa is possible). SMAs are often used as actuators (Ito et al 1995, Mukherjee et al 1996. SMA actuators have many potential applications, such as active shape control of space antenna reflectors, vibration reduction for rotorcraft with active flap control, and active deicing systems for fixed-wing aircraft, among others.…”

Section: Introductionmentioning

confidence: 99%

Active position control of a shape memory alloy wire actuated composite beam

Song

Kelly

Agrawal

2000

Smart Mater. Struct.

102

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Abstract. This paper presents the design and the experimental result of the active position control of a shape memory alloy (SMA) wire actuated composite beam. The composite beam has a honeycomb structure with SMA wires embedded in one of its face sheets for the active actuation. The potential applications of this experiment include thermo-distortion compensation for precision space structure, stern shape control for submarines, and flap shape control for aeronautical applications. SMA wires are chosen as the actuating elements due to their high recovery stress (>500 MPa) and tolerance to high strain (up to 6%). However, SMA wires are inherently nonlinear and pose a challenge for control design. A robust controller is designed and implemented to actively control the tip position of the composite beam. The experiment set-up consists of the composite beam with embedded SMA wires, a programmable current/voltage amplifier to actuate the SMA wires, an infrared laser range sensor to detect the beam tip displacement, and a real-time data acquisition and control system. The experimental result demonstrates the effectiveness of the robust control.

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Section: Introductionmentioning

confidence: 99%