Vibration damping and sound insulating device
A vibration damping and sound insulating device installed on an installation object, includes: vibrators disposed at a prescribed spacing. Each of the vibrators includes: a cylindrical tubular member on the installation object; an elastic body supported by the cylindrical tubular member such that the elastic body traverses a hollow portion of the cylindrical tubular member along a direction orthogonal to an axis of the cylindrical tubular member; and a weight on the elastic body.
1. A vibration damping and sound insulating device installed on an installation object, comprising:
vibrators disposed at a prescribed spacing,
wherein each of the vibrators comprises:
a cylindrical tubular member on the installation object;
an elastic body supported by the cylindrical tubular member such that the elastic body traverses a hollow portion of the cylindrical tubular member along a direction orthogonal to an axis of the cylindrical tubular member; and
a weight on the elastic body, and
wherein the elastic body is a thin plate supported at a peripheral edge by the cylindrical tubular member,
wherein the cylindrical tubular member has a communication hole through which the hollow portion communicates with a space outside of the cylindrical tubular member, and
wherein the space is defined between adjacent ones of the vibrators.
2. The vibration damping and sound insulating device according to claim 1 , wherein the cylindrical tubular member has higher rigidity than the elastic body.
3. The vibration damping and sound insulating device according to claim 1 , wherein the elastic body has a natural frequency adjusted to a vibration frequency of sound to be insulated.
4. The vibration damping and sound insulating device according to claim 1 , wherein a cross section of the cylindrical tubular member along the direction has a point-symmetrical shape centered at a position of the axis of the cylindrical tubular member.
5. The vibration damping and sound insulating device according to claim 1 , wherein the cylindrical tubular member has a trapezoidal cross-sectional shape along the axis.
6. The vibration damping and sound insulating device according to claim 1 , wherein the weight overlaps the axis of the cylindrical tubular member.
7. The vibration damping and sound insulating device according to claim 1 , wherein the prescribed spacing is determined based on a half-wavelength spacing of a wavelength of a bending wave generated in the installation object.
8. A vibration damping and sound insulating device installed on an installation object, comprising:
vibrators disposed at a prescribed spacing,
wherein each of the vibrators comprises:
a cylindrical tubular member on the installation object;
an elastic body supported by the cylindrical tubular member such that the elastic body traverses a hollow portion of the cylindrical tubular member along a direction orthogonal to an axis of the cylindrical tubular member; and
a weight on the elastic body,
wherein a cross section of the cylindrical tubular member along the direction has a circular shape centered on the axis,
wherein the elastic body is formed of wire members each of which is supported at both ends by the cylindrical tubular member, and
wherein each of the wire members has an intersection point with remaining wire members at a position where the axis of the cylindrical tubular member passes.
9. A vibration damping and sound insulating device installed on an installation object, comprising:
vibrators disposed at a prescribed spacing,
wherein each of the vibrators comprises:
a cylindrical tubular member on the installation object;
an elastic body supported by the cylindrical tubular member such that the elastic body traverses a hollow portion of the cylindrical tubular member along a direction orthogonal to an axis of the cylindrical tubular member; and
a weight on the elastic body,
wherein the cylindrical tubular member has a trapezoidal cross-sectional shape along the axis, and
wherein the trapezoidal cross-sectional shape has a larger diameter at an end portion of the cylindrical tubular member where the elastic body is installed than at an end portion of the cylindrical tubular member that is installed on the installation object.