An apparatus includes at least two disk spring washers, at least one ring-shaped outer spacer coupled to the outer edges of one or two of the disk spring washers, and at least one ring-shaped inner spacer coupled to the inner edges of one or two of the disk spring washers. The apparatus also includes a central shaft concentric with the disk spring washers, the outer spacers, and the inner spacers. The apparatus also includes a bottom attachment portion coupled to the bottom of the central shaft to support the at least two disk spring washers, and a top attachment portion configured to slide vertically along the central shaft. The top attachment portion is configured to, with an application of a downward force, compress the at least two disk spring washers.

An apparatus includes a vibration isolator which incorporates at least two disk spring washers. Each disk spring washer has at least one ring-shaped outer spacer coupled to the outer edges of one or two of the disk spring washers, and at least one ring-shaped inner spacer coupled to the inner edges of one or two of the disk spring washers. A bottom attachment portion supports the disk spring washers, and a top attachment portion, with an application of a downward preload force, compresses the disk spring washers. A compression fixture applies and holds the preload force to the top attachment portion, and a second top attachment portion, with application of an additional downward force, further compresses the at least two disk spring washers.

A vehicle tire assembly having a plurality of flexible spoke portions that extend from an outer annular ring to and inner annular ring. Adjacent pairs of the flexible spoke portions define a plurality of gaps therebetween. A plurality of electro-active members, are disposed radially inward from the outer annular ring and radially outward of the inner ring. The plurality of electro-active members are configured such that in the absence of an electric current flowing therethrough, the plurality of electro-active members flex in response to flexing of the plurality of flexible spoke portions. In the presence of an electric current flowing through the plurality of electro-active members, the plurality of electro-active members become more rigid and less flexible adding corresponding stiffness to the plurality of flexible spoke portions.

An unmanned aircraft includes a circuit board with an inertia sensor, and a weight block configured to have a flat surface and a recess formed on the flat surface, and a housing assembly configured to form an inner chamber to accommodate the circuit board and the weight block. The circuit board is embedded in the recess by fixedly bonding to the flat surface through adhesion.

An unmanned aircraft includes a circuit board with an inertia sensor, and a weight block configured to have a flat surface and a recess formed on the flat surface, and a housing assembly configured to form an inner chamber to accommodate the circuit board and the weight block. The circuit board is embedded in the recess by fixedly bonding to the flat surface through adhesion.

A suspension assembly is described. The suspension assembly including a static member or plate; a moving member or plate movable about an x-axis and a y-axis with respect to the static plate; a sensor mounting region on the moving plate; and one or more shape memory alloy (SMA) elements extending between and coupled to the static plate and moving plate. The SMA elements, when driven by a controller, move the moving plate and the sensor mounting region thereon about the x-axis and the y-axis with respect to the static plate.

The vibration damping device for an elevator rope includes: an actuator, which is placed in a hoistway, and is configured to generate a forced displacement in response to a drive input and apply a force generated by the forced displacement to an elevator rope; a lateral vibration measuring unit configured to measure a lateral vibration generated in the elevator rope and output the measured lateral vibration as lateral vibration information; a lateral vibration estimation unit configured to estimate a lateral vibration of the elevator rope at a position of the actuator based on the lateral vibration information and output the lateral vibration as an estimated lateral vibration; and an actuator drive unit configured to output the drive input to the actuator to drive the actuator so that the forced displacement has a phase reverse to a phase of the estimated lateral vibration output from the lateral vibration estimation unit.

In a system for monitoring a vibration-isolated foundation, the system includes: an air pressure monitoring system for monitoring air pressure supplied to air mounts of the vibration-isolated foundation, wherein the air pressure monitoring system includes: a plurality of air ports configured to receive air to be supplied to the air mounts; a plurality of pressure sensors, each of the pressure sensors being configured to measure the pressure of the air supplied to a corresponding one of the air ports and to output the measured pressure as a sensing signal; a control unit configured to receive the sensing signal from each of the pressure sensors and to output a control signal according to a measured value of each of the pressure sensors; and a notification unit configured to operate according to the control signal of the control unit.

In a system for monitoring a vibration-isolated foundation, the system includes: an air pressure monitoring system for monitoring air pressure supplied to air mounts of the vibration-isolated foundation, wherein the air pressure monitoring system includes: a plurality of air ports configured to receive air to be supplied to the air mounts; a plurality of pressure sensors, each of the pressure sensors being configured to measure the pressure of the air supplied to a corresponding one of the air ports and to output the measured pressure as a sensing signal; a control unit configured to receive the sensing signal from each of the pressure sensors and to output a control signal according to a measured value of each of the pressure sensors; and a notification unit configured to operate according to the control signal of the control unit.

A method for operating a drivetrain of a motor vehicle having at least one centrifugal pendulum, in which the centrifugal pendulum comprises at least one primary part rotatable about an axis of rotation, at least one secondary part movable relative to the primary part, and at least one damping medium by which relative movements are hydraulically dampened between the primary part and the secondary part, wherein at least one temperature of the damping medium is calculated by an electronic calculating device of the drivetrain with the aid of a mathematical model.