Note, here, we neglected the possible space angle distribution for the direction of the resonant wave vector k.
Unlike its counterparts that utilize piezoelectric cylinders for fiber actuation, the proposed architecture offers quasi-static actuation in the axial direction along with resonant actuation in the lateral directions forming a 3D scanning pattern, allowing adjustment of the focus plane.
In such case, the resonant frequency in the vertical direction of the robot would be around 4.7 Hz based on theoretical calculation.
The simulations shows that the propagation of guided wave in thin PFA tubes is influenced by the piezoelectric wafers' resonant frequency and the vibration direction when the mode is on the 'water line'.
The method involves so-called directional notch filters that work only in the direction of the targeted resonant mode.
The cone angle, the piezoelectric wafer's resonant frequency and the vibration directions are studied in the simulations.
On the other hand, because of the high stiffness in the vertical direction, a quasi-resonant response was observed in these structures.
At the Floating Pool, beautifully designed by Jonathan Kirschenfeld with its dramatic and symbolically resonant views — Rikers Island in one direction, the Manhattan skyline in another — trouble has been minimal, a fact owing to the ennobling capacity of good architecture or, perhaps more realistically, to engaged, preventative policing.
It is also found that the heave plates indeed introduce large added mass and considerable damping in the system motion in the vertical direction such that the resonant oscillation becomes less of a problem.
The 3DIMAs with the curvature perpendicular to the feeding directions showed more stable resonant frequencies and larger gain values than those of 3DIMAs with the curvature along their feeding directions.
