Actively controlled colloidal damper
AssigneeSchool Juridical Person of Fukuoka Kogyo Daigaku
InventorClaudiu Valentin Suciu
Life of this patent
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Abstract
An actively controlled colloidal damper having controllable damping characteristics. The damper has a cylinder (2); a piston (4) reciprocatably guided and supported by the cylinder (2) and forming a closed space (3) in cooperation with the cylinder (2); a porous body (8) having a large number of fine holes and received in the closed space (3); operation liquid (7) received in the closed space (3) together with the porous body (8), flowing into the fine holes in the porous body (8) when the pressure in the closed space (3) is increased, and flowing out of the fine holes when the pressure in the closed space (3) is decreased, and pressure regulation means, such as a servo value (6) and a pump device (10), for regulating the pressure in the closed space (3).
Claims16
An actively controlled colloidal damper comprising:
- a cylinder;
- a piston guided and supported by the cylinder, the piston having a reciprocating motion and defining a closed space in association with the cylinder;
- a porous body having a large number of pores, and being housed in the closed space;
- a working liquid being housed in the closed space together with the porous body, the working liquid flowing into the pores of the porous body during pressurization, and flowing out from the pores of the porous body during depressurization;
- and
- a pressure controlling device that controls dissipated energy and a damping coefficient of the actively controlled colloidal damper, according to the following Equation (6):
- E
- p
- 0
- >
- 0
- =
- π
-
-
- D
- 2
- 4
-
- ∫
- S
- 0
- -
- S
- V
- S
- 0
- +
- S
- V
-
- [
- p
- c
-
- (
- S
- )
- -
- p
- r
-
- (
- S
- )
- ]
-
- ⅆ
- S
- =
- π
-
-
- D
- 2
- 4
-
- ∫
- 0
- S
- 0
- +
- S
- V
-
- [
- p
- c
-
- (
- S
- )
- -
- p
- r
-
- (
- S
- )
- ]
-
- ⅆ
- S
- >
- E
- p
- 0
- =
- 0
- ;
- (
- 6
- )
- C
- p
- 0
- >
- 0
- =
- E
- p
- 0
- >
- 0
- πω
-
-
- S
- V
- 2
- >
- C
- p
- 0
- =
- 0
- wherein E is the dissipated energy, C is the damping coefficient, D is diameter of the piston, S is displacement excitation, Sv is amplitude of the displacement excitation, S0 is a start position of the piston, ω is circular excitation frequency, p0 is initial pressure, pc is internal pressure during pressurization of the closed space, and pr is internal pressure during depressurization of the closed space.
Dependencies are inferred from the claim text.