130results about How to "Angular velocity stability" patented technology

A mobile telecommunications device comprising: an inkjet printhead for printing to a media substrate; a media feed assembly for feeding the media past the printhead; a print engine controller for operatively controlling the printhead; and, a position sensor for providing the print engine controller with a signal indicative of the position of the media substrate relative to the printhead; such that, the print engine controller differentiates the signal to derive the speed of the media substrate relative to the printhead and adjusts the operation of the printhead in response to variations in the speed.

A mobile telecommunications device comprising: an inkjet printhead for printing to a media substrate; a drive shaft for feeding the media past the printhead; and, a print engine controller for operatively controlling the printhead; wherein during use, the print engine controller senses the number of complete and partial rotations of the media feed roller and adjusts the operation of the printhead in response to variations in the angular velocity of the drive shaft.

Rate sensor comprising two generally planar proof masses, means for driving the masses to oscillate in phase opposition about parallel drive axes in the planes of the masses, an input axis perpendicular to the drive axes, sense axes perpendicular to the drive axes and the input axis, means mounting the masses for torsional movement about the sense axes in response to Coriolis forces produced by rotation of the masses about the input axis, means constraining the two masses for anti-phase movement about both the drive axes and the sense axes, sensing frames coupled to the masses for movement in response to the torsional movement of the masses about the sense axes, and means responsive to movement of the sensing frames for monitoring rate of rotation about the input axis.

An angular rate sensor having two generally planar proof masses, a drive axis in the plane of the masses, and an input axis perpendicular to the drive axis. The masses are suspended from a sensing frame and constrained for anti-phase movement along the drive axis in drive-mode. The sensing frame is mounted for torsional movement in sense-mode about the input axis in response to Coriolis forces produced by rotation of the masses about the input axis, with sensors responsive to the torsional movement of the sensing frame and the masses about the input axis for monitoring rate of rotation.

A handwheel-operated device comprising a body, a handwheel and a chuck, the handwheel and the chuck being rotatable relative to the body, and the device further comprising a first motor operable to rotate the chuck, first sensor means responsive to rotation of the handwheel and first control means operable in conjunction with the first sensor means to cause the first motor to rotate the chuck in dependence upon an angular displacement and/or angular velocity of the handwheel.

A payload stabilizer suitable for use with video camera payloads. The stabilizer has a feedback system providing supplemental torques to the payload through a gimbal while remaining responsive to direct operator control.

A prosthetic foot (190) incorporates a foot keel (192) and a resilient calf shank (193) with its lower end connected to the foot keel to form an ankle joint of the prosthetic foot. The calf shank extends upward from the foot keel by way of an anterior facing convexly curved portion (195) of the shank, and is secured to the foot keel by way of a coupling element (194). The lower end of the shank is reversely curved (196) and housed by a reversely curved portion of the coupling element. A posterior calf device (191) has a cable (204) which is untensioned in a normal gait cycle but tensioned by a force loading on the prosthesis greater than 120% of body weight of the user to limit, e.g. stop, further anterior motion of the upper end of the shank.

The invention discloses a flexible spacecraft underactuated system based on the switching control method and an attitude control method of the flexible spacecraft underactuated system based on the switching control method and belongs to the technical field of spacecraft attitude control. According to the flexible spacecraft underactuated system based on the switching control method and the attitude control method of the flexible spacecraft underactuated system based on the switching control method, a dynamical model of a flexible spacecraft with an execution mechanism completely ineffective is established, coupling, caused by elastic vibration of a flexible accessory, with a rigid body is taken as an uncertainty of the system, a dynamical model of a conversion system is a standard nonlinear model, all states are divided into three sliding model surfaces according to the layering sliding model idea, an equivalent control component is designed for the first layer of sliding model surface according to the Filippov equivalent theorem, a switching control law is designed by means of the second layer of sliding model surface and the third layer of sliding model surface, and a final control law is formed by combining equivalent control input and the switching control law. By the adoption of the flexible spacecraft underactuated system based on the switching control method and the attitude control method of the flexible spacecraft underactuated system based on the switching control method, the defect that in the prior art, a flexible spacecraft can not operate normally under the condition that an actuator becomes ineffective completely during operating of the flexible spacecraft is overcome, and operating reliability of a flexible spacecraft attitude control system is improved.

A liquid bearing is disclosed wherein a droplet of liquid separates a first surface having a plurality of nanostructures from a second surface which may or may not be nanostructured. In one embodiment, the liquid droplet is in contact with the nanostructures on the first surface and the second surface in a way such that friction is reduced between the first and second surfaces as one or both surfaces move laterally or rotationally. In one illustrative embodiment, the first surface of the bearing is a surface of a housing in a gyroscope and the second surface is a nanostructured surface of a mass adapted to rotate within the housing. Thus situated, the rotating mass moves with very low friction thereby permitting, for example, the manufacture of very small, highly precise gyroscopes.

An angular speed detecting device is composed of a magnetic sensor unit connected to a rotating object and including a permanent magnet and a pair of magnetic sensor elements to generate a pair of signals and an electric computing unit that calculates an angular speed from the signals. The electric computing unit calculates the angular speed by the following steps: forming sine and cosine functions of an angle θ′ from the signals; forming a saw-tooth curve of the angle θ′; forming a table showing plus or minus sign of the signals and the saw-tooth curve of the angle θ′ at a plurality of rotation angles of the rotating object; forming a pair of curves of output angles θ₁ and θ₂ in terms of 360-degree angular range by distinguishing rotation position of the rotating object from a combination of the plus, or minus sign of the signals and the saw-tooth curve of the angle θ′; and selectively using curves of the output angles θ₁ and θ₂ to calculate the angular speed of a rotating object.

Dynamically measuring the unbalance of a rotor arranged in a device housing (1) and rotating at high angular velocity, wherein the rotor is supported in a separate bearing housing (14), involves the following steps: fastening the bearing housing (14) on the device housing (1) with interposition of resiliently yielding elements (6) so that the bearing housing (14) can be moved relative to the device housing (1) in at least two spatial dimensions and the rotor is arranged in a working position in the device housing (1) suitable for driving, accelerating the rotor, measuring the vibrations induced by unbalance while the rotor rotates at a substantially normal working speed, determining the phase position of the induced vibrations to the relative position of the rotor at the measuring speeds, and using the measured vibrations and the phase position to determine the unbalance of the rotor to be compensated.

A mobile connectivity and self-generating illumination electric scooter comprises a step-through frame, and is operable as a plug-in electric vehicle with two or three wheels operational inside the wheels. A rechargeable battery stores electricity to drive the electric motor. The scooter also includes: a glossy finish, a rectangular front frame member, an aerodynamic manual brake fin, a communication device support member, detachable floor and front panels having multiple colors and designs, On/Off digital locking system, an accelerator handle and a brake handle differentiated by color; and further, an integral computer, an integrated router forming a Wi-Fi hotspot, a daytime running lamp, a help switch, a sound system, a camera for livestream and social media synchronization, a communication device charger, an integral GPS. The mobile communication device is in communication with, and controls at least one of: the integral computer, the Wi-Fi hotspot, speaker system, camera, help switch, and the GPS.

The method and apparatus for tracking a center of gravity (COG) of an air vehicle provides a precise calculation and updating of the COG by disposing a plurality of acceleration measuring devices on a circumference of one or more rings in a manner that establishes redundancy in acceleration measurement. A multivariable time-space adaptive technique is provided within a high speed digital signal processor (DSP) to calculate and update the position of the COG. The system provides the capability of executing a procedure that reduces dispersion in estimating angular velocities and lateral accelerations of a moving vehicle and corrects the vehicle's estimated angular velocities and lateral accelerations. In addition, a consistency check of the measured values from the acceleration measuring devices is performed to assist in fault detection and isolation of a faulty accelerometer in the system.

A circuit breaker contact assembly includes a line conductor having a folded back fixed contact end, a fixed contact mounted on the contact end, and a movable contact arm having an inner edge and first and second ends. A movable contact is mounted on the first end. The movable contact arm is pivotable about the second end between a closed position in which the inner edge extends adjacent the contact end with the movable contact in contact with the fixed contact to form a reverse current loop, and an open position in which the movable contact is pivoted away from the fixed contact. The contact arm includes a first inner longitudinal member extending along the inner edge and a second outer longitudinal member. The first inner longitudinal member has a higher electrical conductivity than the second outer longitudinal member, which has a higher shear strength and a lower specific density.

An electrical generator apparatus, which is configured to convert an external actuation force applied by a vehicle traveling on a roadway into electrical energy, includes a rotatable top portion adapted to receive the external actuation force applied by the vehicle traveling on the roadway; a plurality of linkage members operatively connected to one another in succession, the rotatable top portion being operatively coupled to a first one of the plurality of linkage members; a first wheel operatively coupled to a last one of the plurality of linkage members; a second wheel operatively coupled to the first wheel via a tangential coupling element; a rotatable shaft operatively coupled to the second wheel; at least one flywheel operatively coupled to the rotatable shaft; and at least one electrical generator operatively coupled to the rotatable shaft, the electrical generator adapted to convert a rotational movement of the rotatable shaft into electrical energy.

A prosthetic foot (100) incorporates a foot keel (101) and a resilient calf shank (105) with its lower end connected to the foot keel to form an ankle joint of the prosthetic foot. The foot keel has forefoot and hindfoot portions and a midfoot portion extending between the forefoot and hindfoot portions. The calf shank extends upward from the foot keel by way of an anterior facing convexly curved portion (106) of the shank, and is secured to the foot keel by way of a coupling element (107) which is monolithically formed with the forefoot portion of the foot. The lower end of the shank is reversely curved (110) and housed by a reversely curved portion (112) of the coupling element.

A brake assembly for a vehicle comprising a wheel comprising a hollow section and a rim, the rim comprising a first portion comprising an electrically conductive material and a second portion adjacent to the first portion comprising a plurality of a permanent magnets and a stator comprising at least one electromagnetic coil arranged to be located within the hollow section of the wheel, wherein the stator is moveable between a first position in which the at least one electromagnetic coil is inductively coupled to the first portion of the rim when the wheel is rotating relative to the stator, and a second position in which the at least one electromagnetic coil is inductively coupled to the second portion of the rim.

Rate sensor comprising a plurality of generally planar masses, a drive axis in the plane of each of the masses, means for driving the masses to oscillate about the drive axes, an input axis perpendicular to the drive axes, sense axes perpendicular to the drive axes and the input axis, means mounting the masses for torsional movement about the sense axes in response to Coriolis forces produced by rotation of the masses about the input axis, and means responsive to the torsional movement about the sense axis for monitoring rate of rotation about the input axis.