Compliance analysis for flow effector actuator based on serial compliant mechanism with double guide ends

To promote the speed of the supersonic air-to-air missile response when the target moves rapidly, a serial compliant mechanism based on the traditional double-slider mechanism actuated by shape memory alloy (SMA) wire is proposed to adjust the protruding height of the flow effector (FE) from the projectile. The aim is to achieve the active disturbance control of the projectile flight attitude. The actuation displacement of the SMA wire is amplified in the output direction, and the FE actuator structure is more lightweight and compact. Based on strain energy, Castigliano's second displacement theorem, and the coordinate transformation method, a free-end displacement mathematical model for a single corner filleted flexure hinge with a single load is developed. For the serial compliant mechanism under single or multiple loads, displacements of the focus points on different rigid links are investigated under varying boundary conditions, such as one fixed end and the other free, double fixed ends, one fixed end and the other a guide end, and double guide ends. The input displacement, output displacement, and displacement amplification of the proposed FE actuator are provided based on the above-mentioned compliance model and verified by finite element analysis and experiments.