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公开(公告)号：US20210025786A1
公开(公告)日：2021-01-28
申请号：US17042296
申请日：2019-03-28
发明人： Tae Joo KIM
IPC分类号： G01M99/00
摘要： The present invention provides blade structure testing equipment comprising: a mounting jig to which one end of a blade specimen is mounted; a grip member to which the other end of the blade specimen is coupled; and a wire (W) having one end attached to the grip member to apply a tensile force to the blade specimen in a direction at a certain angle with respect to the ground. Also, the present invention provides a method for testing a blade specimen, the method comprising: a first step of coupling one end of the blade specimen to a mounting jig and the other end of the blade specimen to a grip member; a second step of determining the values of a centrifugal force, a flap moment, and a lag moment that are to be applied to the blade specimen; a third step of determining the magnitude and direction of a tensile force to be applied to the blade specimen, on the basis of the values determined in the second step; and a fourth step of attaching one end of a wire to the grip member and applying a tensile force to the blade specimen by means of the wire at the magnitude and in the direction of the tensile force determined in the third step.
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公开(公告)号：US20180305002A1
公开(公告)日：2018-10-25
申请号：US15960008
申请日：2018-04-23
发明人： Tae Joo KIM
CPC分类号： B64C27/001 , B64C39/024 , B64C2201/024 , B64C2201/027
摘要： Provided is a multi-copter, including: a fuselage; three or more intermediate supporting bars which have one ends fixed to the fuselage and radially extend from the fuselage; two mounting rods which are divided into two branches at the other ends of the intermediate supporting bars; and a propeller set configured by two propellers which are mounted to two mounting rods and rotate at the same rotational speed (RPM) in opposite directions. When an angle formed by any one propeller between two propellers which form the propeller set and the mounting rod is a first angle and an angle formed by the other one propeller and the mounting rod is a second angle, a difference between the first angle and the second angle is 360/2n degrees and n is a number of blades for every propeller.
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公开(公告)号：US20240124136A1
公开(公告)日：2024-04-18
申请号：US18486339
申请日：2023-10-13
发明人： Tae Joo KIM
摘要： A rotor hub system includes a rotor rotation axis, a flap hinge connected to the rotor rotation axis and enabling flapping motion of a rotor blade, a lead-lag hinge connected to the flap hinge and enabling lead-lag motion of the rotor blade, a first hub to which one end of the rotor blade is fixed, a rotating pitch control actuator connected to the first hub and rotating the first hub to enable pitching motion of the rotor blade, and a second hub equipped with the rotating pitch control actuator and hinged to the lead-lag hinge.
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