公开(公告)号：US20240056726A1

公开(公告)日：2024-02-15

申请号：US18212917

申请日：2023-06-22

Applicant: AGENCY FOR DEFENSE DEVELOPMENT

Inventor： Yub JE ,  Soo-Hyun LIM ,  Yo-Han CHO ,  Jeong-Min LEE ,  Hee-Seon SEO

IPC: H04R1/28 ,  H04R17/10

CPC classification number: H04R1/2811 ,  H04R17/10

Abstract: Proposed is a flextensional low-frequency sound projector including a piezoelectric actuator including a piezoelectric stack formed by stacking piezoelectric element and generating vibration in a lengthwise direction in response to an electrical signal that is input, and a stave mounted on the piezoelectric actuator in such a manner as to encompass an outer surface of the piezoelectric actuator and generating the vibration in the lengthwise direction, which is generated by the piezoelectric actuator, as vibration in a lateral direction perpendicular to the outer surface of the piezoelectric actuator, wherein the stave activates two vibration modes that use different resonance frequencies. The flextensional low-frequency sound projector that utilizes two vibration modes results from improving an existing flextensional low-frequency sound projector that is driven in a single vibration mode and thus has a narrow frequency bandwidth.