Numerical and experimental analysis of superelastic SMA bending springs in rotor systems

Passive Attenuation of Mechanical Vibrations with a Superelastic SMA Bending Springs: An Experimental Investigation

“…The bending spring design (M-Shape) shown in Figure 2A [26] focused on obtaining a larger contact area with the bearing to provide stability for the rotor system acceleration and create a better way to distribute the force applied by the ball bearings and shaft, as illustrated in Figure 2B. Therefore, knowing the characteristics of SMA-SE and focusing on new types of spring designs, following the simulations carried out in our previous work [25] and as a compliment to the existing research, this paper describes an experimental study on the mechanical performance of a spring device with an innovative special design (M-Shape) made of SMA-SE. Our intention is to reduce mechanical vibrations in a rotor system for different applications.…”

“…This M-Shape device was based on the bending spring design presented in our previous work [25,26]. It has fewer curves to facilitate fabrication and to avoid major changes in the phase transformation temperatures of the SMA-SE material, which mainly depend on its composition and history (fabrication process, heat treatments, and others) [4,7,28].…”

“…Three physical situations were tested: (a) without preload, (b) with a 1.0 mm preload (displacement), and (c) with a 1.5 mm preload (displacement). These values were defined based on previous work [25,27]. In order to make it easier to assemble the support bearing with the M-Shape device, steel bushing with a ball bearing was used to apply the selected preloads in the rotor system, as shown in Figure 8.…”

“…Therefore, knowing the characteristics of SMA-SE and focusing on new types of spring designs, following the simulations carried out in our previous work [25] and as a compliment to the existing research, this paper describes an experimental study on the mechanical performance of a spring device with an innovative special design (M-Shape) made of SMA-SE. Our intention is to reduce mechanical vibrations in a rotor system for different applications.…”

Experimental investigation of vibration control of flexible rotors using shape memory alloys

“…In this regard, results showed that phase transformations can control the system behavior altering system stiffness. Senko et al [18] investigated the energy dissipation of pseudoelastic SMA bending elements placed in the rotor bearing. The study focused on the analysis of mechanical loads that induce pseudoelastic behavior, and two different models were explored: loads applied and removed; and a constant load.…”