Origami-based auxetic tunable Helmholtz resonator for noise control

Abstract

In this paper, we propose an origami-based auxetic tunable Helmholtz resonator. By controlling the volume of the cavity, a real-time tunability of the resonance frequency can be achieved. The design is inspired by the waterbomb origami base, which expands when stretched and contracts when compressed. Such a foldable structure offers a wide range of volume variation, which corresponds to a larger frequency shift in the bandwidth of interest. Based on the design of the origami resonator, multi-physical models are established to understand and predict the parameters' effect on the device's behavior. After fabrication, experimental tests are conducted on physical prototypes to validate the models and illustrate the effectiveness of the concept.

Jigsaw‐Inspired Modular Architected Materials with Tailorable Stiffness and Programmable Reconfiguration for Adaptive Flow Regulations

“…[51][52][53] Overall, we demonstrated a new route of assembling modular architected materials for flow regulation but our strategy is also applicable for instability-based, auxetic, kirigami-based, and other types of architected materials that might be applied to a broader wave control applications such as acoustics. [54][55][56] 4. Experimental Section 3D Printing: Single-and multi-material architected units were printed using the fused deposition modeling method with a nozzle diameter of 0.4 mm (Ultimaker, S3 Utrecht, Netherlands).…”

“…[ 51–53 ] Overall, we demonstrated a new route of assembling modular architected materials for flow regulation but our strategy is also applicable for instability‐based, auxetic, kirigami‐based, and other types of architected materials that might be applied to a broader wave control applications such as acoustics. [ 54–56 ]…”

Design of a bidirectional rotational motion actuator by SMA with geometrico-static requirements

“…As for the robotics field, the introduction of origami engineering enables 'semi-rigid' properties. 9 By means of actuation of origami robots using SMA, variety of actuators were introduced in last decades: unidirectional rotational motion 10,11 and bi-directional rotational motion (BRM). [12][13][14] Previous works 15 provided a review of SMA-based actuation of state of the art in SMA-based actuators for BRM.…”

Numerical optimizing noise damping performances of Helmholtz resonators with a rigid baffle implemented at neck in presence of a grazing flow

“…For this, 2-dimensional computational frequency-domain model is developed by applying the linearized NS equations. [21][22] For comparison, the conventional Helmholtz resonator design is chosen to be a benchmark/ reference configuration. Before applying the model, it is validated by comparing with the previous experimental and 2D/3D numerical results reported in the literature.…”