56results about How to "Avoid abnormal vibration" patented technology

A washing machine and a control method thereof sensing an unbalance condition occurring during a spin-dry cycle. The washing machine includes a controller controlling a speed of a motor in accordance with a weight of laundry contained in a rotating tub, upon wrapping the laundry at an initial stage of the spin-dry cycle. A gradient of the motor speed in a laundry wrapping process is determined, depending on the weight of the laundry. Accordingly, to greatly reduce a time prior to a main spin-dry process is possible, while preventing abnormal vibrations from being generated when a rotating speed of the rotating tub reaches a speed, at which resonance occurs.

A vehicle brake apparatus capable of preventing abnormal vibration due to thickness variations in a disc rotor includes a motor drive unit configured to control the motor which presses the brake pad against the disc rotor, a brake pressure detection unit for detecting a braking pressure for pressing the brake pad, and a wheel speed sensor for detecting a rotation speed of the disc rotor. If an amount of variation in the detection values detected by the brake pressure detection unit during one rotation of the disc rotor exceeds a variation amount determination threshold value and a detection value variation frequency has a correlation with the rotation speed of the disc rotor and the detection value variation frequency exceeds a variation frequency determination threshold value, the motor drive unit controls the motor in inverted phase to the variation in the detection values.

The invention provides a drum type washing machine equipped with a displacement detecting means for detecting the displacement of a water tub with accuracy so as to cause neither abnormal vibration nor abnormal noise by the vibration of the water tub holding a rotating drum, due to the unbalance or the like of a washing. A water tub unit 7 is supported in a position closer to the front face side than the center-of-gravity position by a vibration control damper. The water tub unit 7 is disposed in a swingable manner in a washing machine casing 6, and a displacement sensor 36 is disposed on the back face side rather than the vibration control damper 70 and on or near a hanging line from the center-of-gravity position of the water tub unit 7. Since the displacement of the water tub unit 7 is accurately detected by the displacement sensor 36, operation control causing neither abnormal vibration nor abnormal noise can be performed.

The invention discloses an ultrasonic image positioning detecting device of a transformer substation. The device comprises an image displaying mechanism and an ultrasonic detecting mechanism which are connected through a coaxial cable. The ultrasonic detecting mechanism comprises an ultrasonic sensor and a signal preprocessing circuit which are arranged on a quadric surface structure in a matrix mode. The image displaying mechanism comprises a displayer, a processor and a data memory connected with the processor. The processor is provided with a sound intensity mapping processing module which is used for driving and displaying a sound intensity map to quickly judge an ultrasonic source. According to the position of equipment to be detected in the transformer substation, a cubic data model of a quadric surface is built. A three-dimensional coordination system is built on the basis of the model, and preprocessing and display processing of relative ultrasonic signals are carried out. Ultrasonic imaging is achieved by means of pseudo image information, and fast fault positioning is achieved by means of color ring band analysis. The device effectively improves work efficiency of maintenance of the transformer substation, is simple, convenient and practical, and has good popularization and application value.

The invention provides a washing drying machine and a washing machine which can prevent dewatering performance from decreasing. A protruding portion (22a) protruding towards the rotation center (O) of an inner groove (20) in the shape of a spherical surface on a cylinder plate (22), and eight dewatering holes (22b) are disposed on the cylinder plate (22) in a manner of concentric circle with the protruding portion (22a) as the center. Three dewatering holes (22b) are disposed in a vertical direction, two are disposed in a horizontal direction, and the left three are disposed under the vertical direction, and the eight dewatering holes are arranged with equal angles. Patterns composed by a protruding portion (22a) and eight dewatering holes (22b) are continuously disposed in a vertical direction and in a circumferential direction.

The oscillation element according to the present invention includes a torsion bar mounted on a base, and an oscillating member having a light reflection surface for reflecting light from a light source, which is fixed on the torsion bar protruding from the base. The oscillating member oscillates about a longitudinal axis of the torsion bar with an elastic deformation of the torsion bar, thereby deflecting the light that reflects at the light reflection surface in a direction intersecting the longitudinal axis. The oscillating member has two plates that are joined together so as to sandwich the torsion bar. On joining surfaces of the plates are provided with grooves for receiving the torsion bar, respectively. The plates have a symmetrical shape that the longitudinal axis serves as the axis of symmetry.

The invention provides a drum-type washing machine, which can reduce load applied to bearings and to improve durability of the bearings even if a drum oscillates due to unbalanced laundry while the drum rotates at high speed for dehydration. Baffles 40 are fitted to an inner peripheral face of the drum 13 so that an extending direction of each peak part of a chevron-shaped section diagonally crosses a center axis C of the drum 13. During dehydration operation, the drum 13 is driven and rotated in the same direction as the inclination of the extensional direction (clockwise in the figure). As rotation speed of the drum 13 increases, laundry in the drum 13 is raised by the baffles 40 while the laundry is moved toward the rear of the drum 13 following the inclination of the peak parts. Thereby, even if eccentric load is generated by the laundry unbalanced in a peripheral direction of the drum 13, a position of the eccentric load is relatively adjacent to the bearings 16 so as to reduce load applied to the bearings 16.