The specification discloses a vibratory screening apparatus for screening mined ore materials utilizing elliptical vibration, the apparatus having a static section, a dynamic section including a screening deck, the apparatus having three pairs of rotary motion exciter cells positioned with a first group of three said rotary motion exciter cells on a first side of the dynamic section and a second group of three said rotary motion exciter cells on a second side of the dynamic section, each of the cells in said first group forming a pair with a respective one of the cells in the second group, the apparatus further including drive means for rotationally driving the cells, and mechanical synchronisation means linking rotation of a first said pair to a second said pair of the cells whereby, in use, rotation of said pairs of cells are mechanically synchronised.

A vibration generation device includes a stator, and a rotor rotatable around a predetermined axis with respect to the stator and having a weight having a gravity center at a position shifted from the predetermined axis. A control section controls a start-up period maximum voltage value, which is a maximum voltage value of a drive signal to be applied to the vibration generation device in a start-up period, to become larger than a steady operation period voltage value, which is a voltage value of the drive signal to be applied to the vibration generation device in a steady operation period. The control section selects at least one of a pluraity of voltage values as the steady operation period voltage value and sets the duration of the start-up period based on the steady operation period voltage value selected.

A vibrating toothbrush is provided with vibration-isolating zones that substantially isolate vibrations in the head and reduce vibrations transmitted to the handle without sacrificing structural integrity around the vibration-isolation zones. Such zones may generally comprise neck material that is reduced in cross-section, thinned, replaced by dampening material, or removed altogether to create transmission-inhibiting voids. The vibration-isolating zones may be further supported by the housing of the vibratory element to maintain the structural integrity around the zones and to thereby alleviate weakness conditions that might subject the toothbrush to fatigue and breakage.

A tattoo device includes a rotary motor having a built-in motion conversion coupling. The device comprises a frame and an actuator for actuating a needle-driving shaft. The actuator includes an electric motor comprising a stator mounted to the frame, first and second bearings mounted to the frame, and a rotor comprising a rotor shaft rotatably supported at the first and second bearings, and a motion conversion member for converting rotation motion of the rotor to translation motion for reciprocally actuating the needle-driving shaft. The motion conversion member is positioned between the first and second bearings.

The disclosure relates to integrated modules for Synchronized Array of Vibration Actuators (FIG. 125A). The modules provide physical interface, power and communication interfaces. Each module may include vibration actuators (FIG. 123A) which can be precisely attached and aligned to the module housing, a microcontroller or other microprocessor, and one or more sensors for closed loop control of actuators (FIG. 126G). Interleaved pairs of ERMs having a center of mass in the same plane eliminate parasitic torque. A single module can produce a vibration force that rotates at a specific frequency and magnitude, which on its own could cancel out some types of periodic vibrations (FIG. 125B). Two modules paired together and counter-rotating with respect to each other can produce a directional vibration at a specific frequency and magnitude, which could prove even more useful for canceling out a vibration. Such modules are also employed to produce beating patterns (FIGS. 131-133). Both amplitude and frequency of the beating force are variable.

Circular force generator devices (100), systems, and methods for damping vibrations which include two complementary rotor assemblies (110, 120) that are rotatable together about a common shaft (102) but that have an adjustable rotational position (P1, P2) with respect to one another such that a significant reduction in rotor inertia and bearing drag relative to conventional CFG configurations is provided. The present architecture creates virtually zero rotating moment.

A device is provided for monitoring the compaction of concrete introduced into a slipform of a slipform paver by means of at least one concrete compacting device that has an asynchronous motor for driving an unbalanced mass which generates vibrations. The monitoring device comprises an apparatus for monitoring the stator current of the asynchronous motor, the apparatus being configured such that a change in the compaction of the concrete is determined based on an analysis of the stator current. The apparatus for monitoring the stator current of the asynchronous motor is preferably configured such that the amplitude spectrum of the stator current is determined in order to analyse the stator current. It is advantageous that the compaction of the concrete is not monitored using sensors which are exposed to harsh ambient conditions during operation of the slipform paver.

Devices and methods for removing material from a slanted roof. The devices include motorized unbalanced rotors in a mounting frame adapted to mounting to roof structural features. The methods include mounting the devices to roof structures and actuating the motor, generating vibrations that are propagated to the roof surface to disengage undesirable debris, such as snow.

A concrete vibrator can automatically change the rotational speed of a motor depending on the state of a vibrating tube. Under control by a controller, the concrete vibrator is operated in a normal mode in which the motor is supplied with driving power having a frequency to make the motor rotate at a rotational speed suitable for air bubble removal, or in an idling mode in which the motor is supplied with driving power having a frequency to make the motor rotate at a lower rotational speed than in the normal mode. The controller measures, per unit of time, a value of a current that is input to the controller or motor, compares a latest current value to a reference value calculated based on a past measurement value, and compares an absolute value of the comparison value to a threshold to grasp the state of the vibrating tube.

A vibratory handle for use with a surface finishing float, the vibratory handle including a first end having a bore for receiving a first float attachment screw therein for attaching the first end to the finishing float. The vibratory handle further including a second end having an oblong slot for receiving a second float attachment screw therein for attaching the second end to the finishing float such that the first float attachment screw and second float attachment screw are in operative alignment and spaced apart a distance along a surface the float. The vibratory handle also includes a gripping portion extending between the first end and second end.