There is provided a vibration suppression device of a rope-like body that can use a negative restoring force that amplifies a displacement of a rope-like body of an elevator to prevent the displacement from becoming unstable. A vibration suppression device (21) includes a first displacement measurement unit, a first displacement amplifier, and a control unit (24). The first displacement measurement unit measures a displacement in a lateral direction of the rope-like body due to vibration about an equilibrium position (20) at a first position (P1) in a longitudinal direction of the rope-like body. The first displacement amplifier applies, to the rope-like body, a negative restoring force that amplifies the displacement of the rope-like body. The control unit (24) causes the first displacement amplifier to apply a negative restoring force smaller than a positive restoring force, based on the displacement measured by the first displacement measurement unit.

There is provided a vibration suppression device of a rope-like body that can use a negative restoring force that amplifies a displacement of a rope-like body of an elevator to prevent the displacement from becoming unstable. A vibration suppression device (21) includes a first displacement measurement unit, a first displacement amplifier, and a control unit (24). The first displacement measurement unit measures a displacement in a lateral direction of the rope-like body due to vibration about an equilibrium position (20) at a first position (P1) in a longitudinal direction of the rope-like body. The first displacement amplifier applies, to the rope-like body, a negative restoring force that amplifies the displacement of the rope-like body. The control unit (24) causes the first displacement amplifier to apply a negative restoring force smaller than a positive restoring force, based on the displacement measured by the first displacement measurement unit.

Apparatus and methods to reduce unwanted motion in precision instruments are described. An active vibration-isolation system may include a feedback loop that senses motion of an intermediate mass. In noisy environments, where the feedback loop would otherwise fail or provide inadequate isolation, feedforward control can be implemented to sense floor vibrations and reduce motion of the intermediate mass that would otherwise be induced by the floor vibrations. The feedforward control can reduce motion of the intermediate mass to a level that allows the feedback loop to operate satisfactorily.

A vibration damping structure (60), a detection system and a sequencing system. The vibration damping structure (60) is used in the detection system. The vibration damping structure (60) comprises a main body (62) and a support body (64), the main body (62) is connected to the detection system by means of the support body (64), the main body (62) comprises an imaging module (10), an upper layer structure (66), a lower layer structure (68) and an intermediate structure (70), the imaging module (10) is mounted on the upper layer structure (66), the lower layer structure (68) bears the upper layer structure (66) by means of the intermediate structure (70), and the natural frequency of the main body (62) is greater than or equal to √{square root over (2)} times the internal excitation frequency.

A vibration damping apparatus configured to damp a vibration of a target member includes a mass body, a base disposed on the target member, a support member disposed on the base and configured to support the mass body, a housing disposed on the base so as to surround the support member, an elastic member disposed so as to form a space in the housing and configured to apply a force to the support member, and a control unit configured to control a pressure of a fluid in the space by supplying the fluid to the space based on a vibration state of the target member.

Systems, devices, and methods of protecting sensitive equipment against vibrations, mechanical shocks, and earthquakes. A support device includes a lower fixed or non-moving frame, and an upper movable frame. The two frames are connected via four dampers, at or near their four corners; and also by four generally-vertical cables or wires that together with the supported device operate as an inverted pendulum or an upside-down pendulum in response to incoming vibrations or applied forces. The dampers, as well as the inverted pendulum created by the cables, dissipate and absorb vibration energy and mechanical shocks. Optionally, the entirety of the support device has not more than four dampers. Optionally, the entirety of the support device has or not more than eight dampers, wherein four of the eight dampers are not connected to the vertical cables, and four other of the eight dampers are connected to lower ends of the four vertical cables.

Systems, devices, and methods of protecting sensitive equipment against vibrations, mechanical shocks, and earthquakes. A support device includes a lower fixed or non-moving frame, and an upper movable frame. The two frames are connected via four dampers, at or near their four corners; and also by four generally-vertical cables or wires that together with the supported device operate as an inverted pendulum or an upside-down pendulum in response to incoming vibrations or applied forces. The dampers, as well as the inverted pendulum created by the cables, dissipate and absorb vibration energy and mechanical shocks. Optionally, the entirety of the support device has not more than four dampers. Optionally, the entirety of the support device has or not more than eight dampers, wherein four of the eight dampers are not connected to the vertical cables, and four other of the eight dampers are connected to lower ends of the four vertical cables.

A low-profile shock isolating payload mounting assembly comprises a first mount, a second mount, and an isolator. The second mount is movable relative to the first mount and comprises a riser comprising an inclined surface. The isolator comprises an inner frame and an outer frame. The inner frame couples to the first mount and comprises a platform and a leg extending from the platform. The leg is inclined to be complementary to the inclined surface of the second mount. The outer frame couples to the second mount and comprises an opening for accessing the platform of the inner frame. The rail is inclined so as to be complementary to the leg to capture the leg between the rail of the outer frame and the inclined surface of the second mount. The isolator operates to dampen vibrations and shocks propagating between the first and second mounts.

A reaction compensation device includes a drive mechanism driving a first movable part with respect to a base, a reaction mass drive mechanism driving a second movable part with respect to the base; and a first relative position sensor measuring a relative position between the first movable part and the base. There is also a second relative position sensor measuring a relative position between the second movable part and the base, a first control system controlling the drive mechanism by taking in a signal outputted from the first relative position sensor as a feedback signal in response to a command value, and a second control system correcting the command value using a correction parameter for adjusting a difference between mass properties of the drive mechanism and reaction mass drive mechanism and for controlling the reaction mass drive mechanism.

A subsea tubular system comprises extended sections of a first material and interposed sections of a second, different material that aids in damping vibration resulting from subsea dynamic conditions such as current. The vibration damping sections may make up a portion of the overall system significantly less than the sections of the first material. The number, length, and positions of the vibration damping sections may be selected based on factors such as the diameter, overall length, profile, and so forth. The system may be used as a riser or other conduit for the production of minerals such as oil and gas.