Blade assembly
View Patent ↗A blade assembly including a rotor; a body portion connected to the rotor and having a space therein; and at least one vibration reduction member provided in the space.
1. A blade assembly comprising:
a rotor;
a body portion connected to the rotor and comprising a space therein; and
at least one vibration reducer provided in the space,
wherein the space comprises a plurality of spaces,
wherein the plurality of the spaces are arranged in a radial direction of the body portion and are arranged in a direction extending from a leading edge of the body portion to a trailing edge of the body portion, and
wherein a first number of the plurality of spaces formed between a center of the blade body portion and the leading edge is greater than a second number of the plurality of spaces formed between the trailing edge and the center of the blade body portion.
2. The blade assembly of claim 1 , wherein the space is provided adjacent to the leading edge of the body portion.
3. The blade assembly of claim 1 , wherein the at least one vibration reducer is of a powder type.
4. The blade assembly of claim 1 , wherein the at least one vibration reducer is configured to generate a frictional contact with the space.
5. The blade assembly of claim 4 , wherein a frictional force generated by the frictional contact has a different phase from a speed of the at least one vibration reducer.
6. The blade assembly of claim 1 , wherein the at least one vibration reducer is configured to rotate in a speed slower than a rotation speed of the body portion.
7. The blade assembly of claim 6 , wherein the at least one vibration reducer is configured to rotate in the speed slower than the rotation speed of the body portion at a resonance frequency.
8. The blade assembly of claim 1 , wherein the at least one vibration reducer and the body portion are made with the same material.
9. The blade assembly of claim 1 , wherein the plurality of the spaces are arranged in a circumferential direction in the body portion.