Patent ID: 7793547

Claim:
Vibration excitator, comprising: a main body; a stinger which is adapted to move relative to the main body, in a particular working direction; an actuator coupled to the main body and the stinger; wherein the stinger has a first end that is coupled to the main body, and an opposite second end that is intended for attachment to an object to be examined; wherein the stinger has an elastic centre point; wherein the main body has a centre of gravity; and wherein L ⁢ ⁢ 1 ≤ L ⁢ ⁢ 3 ≤ L ⁢ ⁢ 1 + K P K X · L ⁢ ⁢ 2 applies wherein L 1 is the distance between the elastic centre point and the second stinger end, measured along the said working direction; wherein L 2 is the distance between the first stinger end and the second stinger end, measured along the said working direction; wherein L 3 is the distance between the centre of gravity and the second stinger end, measured along the said working direction; wherein Kx represents the stiffness [N/m] of the stinger for translation in vertical direction, and wherein Kp represents the stiffness [Nm] of the stinger for angular deflection.