It has been proved by many engineering construction practices that the electric butterfly valve hole drawing process equipment is simple, which not only saves materials, but also has a variety of shapes, such as round, oval, rectangular, arch, octagonal, trapezoidal and other apertures, as well as straight holes, variable cross-section faces (positive and oblique), which can make the building structure light and thin-walled hollow beams and slabs
(1) The equivalent stiffness and equal internal stiffness of electric butterfly valve with additional air chamber are created. The aperture size has a significant impact on the system stiffness and damping, and the stiffness gradually decreases from. large stiffness to. small stiffness with the increase of orifice diameter; The system damping ratio first increases and then decreases with the increase of the orifice diameter, so the orifice opening control can realize the simultaneous adjustment of the stiffness and damping of the electric butterfly valve system.
(2) The increase of the excitation frequency will increase the system stiffness and natural frequency, and reduce the damping ratio. Therefore, the high-frequency excitation is not conducive to the reduction of stiffness of the additional air chamber and the damping effect of the orifice.
(3) When the working height is constant, the change of static load of electric butterfly valve with additional air chamber has little effect on the system damping and natural frequency.
(4) When the volume ratio of auxiliary main air chamber is less than 2, increasing the volume of auxiliary air chamber can reduce the system stiffness; Increase the capacity of additional air chamber
The product can also increase the damping ratio of the system, which is conducive to the attenuation of vibration.