A vibration control device of a plate-like member 11 includes: a plurality of piezoelectric element actuators 14; at least one piezoelectric element sensor 15; and a control circuit 17 that performs feedback control of operation of the piezoelectric element actuators 14 based on an output voltage of the piezoelectric element sensor 15 so as to suppress vibration of the plate-like member 11. A layout of the piezoelectric element sensor 15 and the piezoelectric element actuators 14 is set such that anti-resonance occurs in an output voltage of the piezoelectric element sensor 15 in a range where the vibration frequency of the plate-like member 11 is equal to or less than a predetermined value. Therefore, generation of noise can be prevented at the frequency. As a result, a gain can be increased at a control target frequency. Therefore, vibration can be suppressed, and noise can be reduced.

The vibration-suppressing mechanism includes: a first arcuate member that has an inner wall surface shaped along an outer wall of a column of a charged particle beam device; a second arcuate member that has an inner wall surface shaped along an outer wall of a column of the charged particle beam device and is connected to the first arcuate member to form an annular member surrounding the outer wall of the column of the charged particle beam device; a fastening member fastening both the first arcuate member and the second arcuate member together; a vibration sensor attached to the arcuate member; and an actuator that operates in response to an output of the vibration sensor, and can be detached by releasing connection obtained by a connecting member.

A system for airfoil vibration control is generally provided. The system includes an airfoil including a ferromagnetic material, and a static structure including an electromagnet adjacent to the ferromagnetic material of the airfoil. A method for controlling vibration at an airfoil of a turbo machine is further provided. The method includes placing a ferromagnetic material at the airfoil, placing an electromagnet at a static structure adjacent to the ferromagnetic material at the airfoil, and applying an electromagnetic force to the ferromagnetic material at the airfoil via the electromagnet at the static structure.

A compliant structure including a frame and a shuttle distant from the frame mounted on a cantilever that is supported by the frame. The cantilever and shuttle together are movable transversely to and out of a plane of the frame. The structure also includes one or more flexures that connect the cantilever with the frame. The cantilever includes a body at least in part extending in a first direction which points to the shuttle. The one or more flexures connect to the shuttle and/or to the cantilever in the vicinity of the shuttle. The flexures are oriented in a second direction, which second direction is generally transverse with respect to the first direction.

A system for passive damping of mechanical vibrations generated by a vibrating structure supported by a support, including a transducer interposed between the vibrating structure and the support to transform mechanical energy of vibrations into electrical energy. The transducer includes a flextensional structure having a first axis perpendicular to a second axis, a stack of piezoelectric elements adapted to produce electrical energy when stressed, the stack stressed in compression by the flextensional structure along the first axis so that deformation of the structure modifies the compressive stress applied to the stack, two peripheral fasteners are secured to the flextensional structure, each fastener disposed along the second axis, a first fastener for securing the flextensional structure to the vibrating structure, a second fastener for securing the flextensional structure to the support, at least one fastener integrates an elastic suspension, a shunt connected to the piezoelectric stack to dissipate electrical energy.

A variable stiffness structure configured to isolate a mass from unwanted vibrations includes a negative stiffness element and an actuator operatively coupled to the negative stiffness element. The actuator is configured to be actuated to control a stiffness of the negative stiffness element. The variable stiffness structure may also include a positive stiffness element coupled to the negative stiffness element.

The vibration-suppressing mechanism includes: a first arcuate member that has an inner wall surface shaped along an outer wall of a column of a charged particle beam device; a second arcuate member that has an inner wall surface shaped along an outer wall of a column of the charged particle beam device and is connected to the first arcuate member to form an annular member surrounding the outer wall of the column of the charged particle beam device; a fastening member fastening both the first arcuate member and the second arcuate member together; a vibration sensor attached to the arcuate member; and an actuator that operates in response to an output of the vibration sensor, and can be detached by releasing connection obtained by a connecting member.

A pseudo feature for a suspension and method of manufacture are described. The pseudo feature for a suspension includes a first constraining layer; a second constraining layer; and a damping layer arranged between the first constraining layer and the second constraining layer.

To solve a problem, for example, in which holding a movable mass becomes difficult because the spring characteristics of a rubber constituting a basis are set low in order to set the characteristic value at a low value. In a first dynamic vibration absorber including a movable mass that is coupled to a vibration damping target member via an MRE as a first elastic member having elastic characteristics variable with a magnetic field, and being capable of varying a vibration characteristic value of the movable mass by controlling the magnetic field, the dynamic vibration absorber has a second elastic member different from the MRE, and the vibration damping target member and the movable mass are elastically-coupled to each other via the second elastic member.

An active damper is disclosed which includes: an elastic support body; a first wall section provided at the elastic support body and defines a first liquid chamber; a second wall section provided on an opposite side and defines a second liquid chamber; a partition wall section which separates the first liquid chamber from the second liquid chamber; an orifice in the partition wall section for communication between the first and second liquid chambers; and a damping unit to attenuate the vibrations transmitted from a vibrating source to the vibration-receiving part. The damping unit includes: a coil to generate a magnetic field according to a current supplied; magnetic members forming a closed magnetic circuit for the magnetic field; and a magneto-viscoelastic elastomer having a viscoelasticity changes depending on the magnetic field. At least one of the first and second wall sections, and the partition wall section has the damping unit.