A method and apparatus for automatically repairing structure cracks. The method may include mixing a filler material with ferromagnetic dust to create a filler material mixture. The method may also include storing each filler material mixture in a filler material reservoir. The method may also include creating an array of magnetic coils in the structure, where the array of magnetic coils creates a magnetic path through the structure. The apparatus may include a structure. The structure may include a plurality of filler material reservoirs, wherein each filler material reservoir stores a filler material mixture. The structure may also include an array of magnetic coils inside the structure.

A haptic operating device for a motor vehicle has a base, a stationary central part connected thereto, a rotary knob which can be rotated about the stationary central part and which has a hollow design. A magnetorheological transmission device influences the rotational movement of the rotary knob in a controlled manner. The transmission device has two components which can be rotated relative to each other and one component of which is designed as a brake component that can be rotated relative to the base. The stationary central part is secured to the base by means of a support arm. The transmission device and the support arm are arranged adjacent each other and both are received radially within the rotary knob. The rotary knob is rotationally fixed to the rotatable brake component via a coupling device.

A method of performing wireless actuation by inductive heating of magnetic particles. The method provides a bladder having an inner surface and an outer surface, the inner surface forming an interior area, the bladder configured to expand or retract so as to change an area of the interior area, (ii) a plurality of magnetic particles suspended in a fluid medium and disposed within the interior area, and (iii) a sleeve disposed on the outer surface of the bladder. The method excites the plurality of magnetic particles by application of an alternating magnetic field to which the particles reaction. The method causes, by the excited magnetic particles, a phase transition to the fluid medium within the interior area which causes the bladder to expand, such that the sleeve confining the bladder generates actuation from the expansion or retraction of the bladder.

A mount bush includes a tubular member, a shaft member disposed inside the tubular member coaxially with an axis of the tubular member and including a coil, a permanent magnet provided on at least one of the tubular member and the shaft member, a magnetic viscoelastic fluid filled in an internal space, a first liquid chamber disposed in the internal space at a first side, a second liquid chamber communicating with the first liquid chamber, and a third liquid chamber communicating with the second liquid chamber, wherein the coil is disposed such that a magnetic path passing through the second liquid chamber in an orientation along at least one of the axial direction and the radial direction perpendicular to the axial direction is formed through electrical conduction, and the permanent magnet is disposed such that a magnetizing direction is formed along the magnetic path.

A deformable mirror can include a reservoir containing a ferrofluid. The deformable mirror can also include a reflective face sheet covering a front side of the reservoir such that a back side of the reflective face sheet is exposed to the ferrofluid. The reflective face sheet can have a reflective surface on a front side of the reflective face sheet opposite the back side. The reflective face sheet can have a non-uniform thickness between the front and back sides of the reflective face sheet to provide stiffness for the reflective face sheet. In addition, the deformable mirror can include one or more electromagnets operable to generate a magnetic field that acts on the ferrofluid to deform the reflective face sheet. A deformable mirror system can further include a control system operably coupled to the one or more electromagnets to control the magnetic field and thereby a deformation of the reflective face sheet.

In embodiments, a work vehicle magnetorheological fluid (MRF) joystick system includes a joystick device, an MRF joystick resistance mechanism, and a controller architecture. The joystick device includes, in turn, a base housing, a joystick movably mounted to the base housing, and a joystick position sensor configured to monitor movement of the joystick relative to the base housing. The MRF joystick resistance mechanism is controllable to vary a first joystick stiffness resisting movement of the joystick relative to the base housing in at least one degree of freedom. The controller architecture is configured to: (i) detect when unintended joystick motion conditions occur during operation of the work vehicle; and (ii) when detecting unintended joystick motion conditions, command the MRF joystick resistance mechanism to increase the first joystick stiffness in a manner reducing susceptibility of the joystick device to unintended joystick motions.

Provided are a magnetorheological fluid rotational load device and a method of controlling the same. The magnetorheological fluid rotational load device includes a housing, a yoke fixed in the housing, a shaft rotatably mounted at the center in the housing, one or more rotation rings connected to the shaft to rotate in association with rotation of the shaft, a coil disposed in the housing, a magnetorheological fluid filling the housing.

A loudspeaker is provided with a motor assembly having at least one planar coil and first and second magnets magnetized in a magnetized direction perpendicular to direction of coil movement and perpendicular to a central axis of radiation of the loudspeaker. Ferrofluid is disposed between a diaphragm and the first and second magnets. Third and fourth magnets are disposed outside the first and second magnets and are magnetized in a direction parallel to the direction of coil movement and perpendicular to the magnetized direction of the first and second speakers.

A stage device includes a stage configured to hold a target substrate in a vacuum chamber, a cold heat transfer body fixedly disposed below a bottom surface of the stage with a gap between the stage and the cold heat transfer body and cooled to an extremely low temperature by a chiller disposed below the cold heat transfer body, and cooling fluid supplied to the gap to transfer cold heat of the cold heat transfer body to the stage. The stage device further includes a stage support configured to rotatably support the stage and formed in a cylindrical shape to surround an upper part of the cold heat transfer body wherein the stage support has a vacuum insulation structure, and a rotation part configured to support the stage support and rotated by a driving mechanism while being sealed with magnetic fluid.

Tunable electronic units and associated systems, as well as methods for tuning characteristic properties of soft electronic units (e.g., inductance, capacitance, and resistance) and fabricating soft tunable planar inductors, axial inductors, capacitors, and resistors, are provided. Disclosed systems and methods enable standardized tuning of different types of soft electronic units (e.g., including a soft inductor, capacitor, and resistor, etc.), and enable remote tuning while maintaining a tuned value without expending power. In certain embodiments, electrical properties of the soft electronic units are tuned using a mobile component (e.g., ferrofluid and iron powder) dragged with a permanent magnet inside a soft fluidic channel. This may be used for applications and devices which need to be soft and flexible, such as implantable electronics, wearable devices, and skin electronics.