PURPOSE:To utilize a motor easy to design and make a drive section compact by obtaining a control force applied between a movable mass and a high-rise building via the torque of a pinion rack mechanism in the rotation direction. CONSTITUTION:When a high-rise building 2 tends to vibrate in the X direction, a vibration sensor 6 detects the signals and sends a vibration acceleration signal to a control unit 8. The control unit 8 feeds the current to a motor, and the motor generates the torque T in response to the vibration speed and is rotated. The generated torque T is converted into a control force U and is applied between a movable mass 3 and the fitting base of the motor to dampen vibrations of the high-rise building 2. Accordingly, the control force U applied between the movable mass 3 and the high-rise building 2 is obtained via the torque T of a pinion rack mechanism in the rotation direction, thus a motor easy to design can be utilized, and drive section can be constituted compactly.

Vibration control device

PROBLEM TO BE SOLVED: To enhance vibration removing performance by attaching a damping unit to an apparatus mounted on a surface plate of a precision vibration removing table, thereupon making feedback control so that the vibration in the prescribed direction is diminished, and eliminating the influence of the resonance of an additional vibration system consisting of a movable mass and a leaf spring of the damping unit. SOLUTION: An active type vibration removing device determines the control input u 1 applied to a linear motor 32 by a fundamental control part 4a of a controller 4 on the basis of the vibrating condition of the apparatus D sensed by an acceleration sensor 31. As a reaction force with which the movable mass 33 is driven, a controlling force such as to diminish the vibration of the apparatus D is obtained from u 1 . In this control, the control input u 2 is determined with the corrected control input u 1 by a correction control part 4b of the controller 4 so that the vibrational portion of the apparatus D due to resonance of the additional vibrating system consisting of the movable mass 33 and leaf spring 34 is ignored. COPYRIGHT: (C)2009,JPO&INPIT

Active type vibration removing device and damping device used therefor

PURPOSE:To wind up band-like plates under a uniform tension, by fitting a plurality of plungers in each of wind-up barrels widthwise split, radially of a wind-up shaft so that the torque of the wind-up shaft is transmitted to the wind-up barrels by means of hydraulic pressure obtained by the pumping action of the plungers. CONSTITUTION:A plurality of sets of pump mechanisms 16 each consisting of plungers 12, cylinder suction valves 14, and discharge valves 15 are incorporated in a wind-up hollow shaft 11, radially of the latter, a positions corresponding to wind-up barrels 6 widthwise split. Each wind-up barrel 6 has its inner surface which is a corrugated quadratic curved surface, and therefore, the plungers are made into contact with this curved surfaces so that they are radially reciprocate to effect pump action. Therefore, the difference in rotational speed (rotational slip amount) occurs between the wind-up barrel and the wind-up shaft, and therefore, band-like plates may be wound under a uniform tension at a uniform speed irrespective of the wind-up diameter thereof.

Winding device for several band-like plates

PURPOSE:To obtain a balancer mechanism having an unlimited vibration frequency, which may be easily additionally mounted to an existing engine or a newly designed engine, by providing a balancer head and operating the balancer head according to engine rotational speeds and load conditions CONSTITUTION:A balancer head 1 is mounted to an engine 0 The balancer head 1 is designed to receive a hydraulic pressure through a servo valve and operate a hydraulic piston by the hydraulic pressure An inertial mass is connected with the hydraulic piston A control device 3 receives a signal corresponding to an engine rotational speed from a rotation reference signal generator 4, and further receives an engine load signal through a control signal line 5 The control device 3 acts to control the servo valve according to the engine condition As a result, the inertial mass is operated to vibrate the engine 0

Balancer for reciprocating engine

PURPOSE:To prevent the stroke of a movable mass body from rashly getting larger by cutting off the very low frequency component of the rate of vibration of a vibrating body and control an actuator which drives said movable mass body. CONSTITUTION:A movable mass body 1 is installed on a vibrating body 4 movably by means of a spring 2 and an actuator 3. An accelerometer 5 installed on the vibrating body 4 is connected to a controller 6, to detect the rate of vibration by means of the integrator 7 of the controller 6 and, after its very low frequency component is cut off by a high-pass filter 11, the rate of vibration generates a reverse controlling force proportionate to the rate of vibration of the actuator 3.

Vibration controlling device

PURPOSE:To enlarge a damping factor of vibration in a structure as well as to secure a damped vibration effect for a wide range of frequency, by adding mass to the structure, while making controlling force act on between the added mass and the structure according to vibrations in the structure. CONSTITUTION:When external force P acts on a building 1 by way of a wind or the foundation, a vibration is excited to the building 1. Vibro-acceleration in the building 1 is detected by an accelerometer 3, fed to a control unit 5 and given to an actuator 6 via an integrator, a speed signal amplifier and a power amplifier. At this actuator 6, there is produced controlling force in proportion to a roof velocity, between an added mass and the building 1, causing the vibration damping of the building 1 to grow large. Also in an interspace between the building 1 and the added mass 2, a displacement meter 4 detecting a relative displacement is installed, emitting a relative displacement signal, through which the actuator 6 is energized and the controlling force proportional to the relative displacement is produced.

Nakamura Yasuji

Papers

Vibration insulating device

Traffic signal apparatus