Actuators used in active vibration isolation systems of various types are either installed between the oscillating mass and the base, or next to the elastic-dissipative elements of a passive system. The actuator is usually controlled according to information from force-measuring devices. This significantly complicates the implementation of such systems. An active system is considered in which an electrodynamic drive (actuator) is used to compensate for vibroactive forces transmitted to the base. An electrodynamic drive is mounted on the base and controlled by accelerometers mounted on the passive system moving masses and the actuator. Straight-line controlled vibrations of the actuator moving mass provide inertial compensation of vibroactive forces on the base.
The paper deals with the planar problem of vibration isolation. The active vibration damper is mounted on an oscillating mass with a vibroactive unit at a point that does not coincide with the mass center and the action of the vibroactive force does not coincide with the mass center. An active dynamic vibration damper is an electrodynamic drive in which the translational movement of the moving mass is carried out according to information about acceleration from an accelerometer mounted on an oscillating mass with a vibroactive unit. The paper gives an assessment of the vibration isolation effectiveness, depending on the mismatch with the mass center of the vibrational force application points, the settings of the active damper and accelerometer.
Рименяемые в активных системах виброизоляции различного типа актуаторы либо устанавливаются между колеблющейся массой и основанием, либо рядом с упруго-диссипативными элементами пассивной системы. Управление актуатором обычно производится по информации от силоизмерительных устройств, что значительно усложняет реализацию таких систем. В работе рассмотренаактивная система, в которой для компенсации виброактивных сил, передающихся на основание, использован электродинамический привод (актуатор), устанавливаемый на основание и управляемый от акселерометров на подвижных массах пассивной системы и актуатора. Прямолинейные управляемые колебания подвижной массы актуатора обеспечивают инерционную компенсацию виброактивных усилий на основании.
In the problems of vibration isolation of hydraulic system units, such as pumps, an important role is played by the problem of oscillation propagation through unsupported connections (pipelines). In order to solve this problem, in particular, rubber-cord tubes are used, which vibration-insulating properties are determined by their mechanical impedances. The aim of the work is to obtain the theoretical basis for the development of methods for the experimental determination of mechanical impedance of vibration insulating branch pipes, taking into account the flexibility of elements of the experimental facility in the case of lengthwise vibrations.
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