Stay cable parametric vibration demonstration experiment device and its application method

Abstract

The invention discloses a stay cable parametrically excited vibration demonstrative experiment device and a use method thereof. The device comprises a base frame, a fixed support frame, a force measurement sensor and a vibration exciter, wherein the fixed support frame comprises a cross beam, a stand column, a wing beam, a reinforcing support, a triangular support and a fixed pulley; the cross beam, the stand column and the wing beam are perpendicularly and fixedly connected; the reinforcing support is fixed in the connecting position of the cross beam and the wing beam; the triangular support is fixed at the lower part of the stand column; the fixed pulley is fixed at the upper part of the stand column; the cross beam and the wing beam are fixed on the base frame, the top end of the cross beam extends out of the base frame, and through holes are equidistantly formed in the cross beam extending out of the base frame; the force measurement sensor is fixed on the triangular support of the fixed support frame; a stay cable penetrates through the fixed pulley, one end of the stay cable is connected with a force measuring connector of the force measuring sensor, and the other end penetrates through the one through hole in the cross beam to be connected with a clamping head; the vibration exciter is arranged on the base frame and located on the lower surface of the cross beam extending out of the base frame. By means of a mechanical and dynamical system, a parametrically excited vibration theory is visibly demonstrated, and perceptual knowledge is given to people.

Description

technical field [0001] The invention belongs to teaching and scientific research demonstration and experimental instruments, and relates to a demonstration instrument and an experimental instrument for the parametric excitation vibration phenomenon of nonlinear vibration dynamics, in particular to a cable-stayed cable parametric excitation vibration demonstration instrument and an experimental device. Background technique [0002] Parametrically excited vibration, also known as parametrically excited vibration, is another vibration form besides free vibration, forced vibration and self-excited vibration. Parametric vibration is generated by external excitation, but the excitation is not applied to the system in the form of external force, but is realized indirectly through the periodic changes of the intrinsic parameters of the vibration system, such as mass, stiffness, and damping. This causes the dynamic equation of the system to be a nonlinear equation. Therefore, the pa...

AI Technical Summary

Problems solved by technology

Demonstrating the parametric vibration phenomenon of cable-stayed cables with a simple mechanical and dynamic system, it overcomes the problems that the parametric vibration phenomenon of cable-stayed cables is abstract, difficult to understand, and often causes people to have vague concepts, and gives people an intuitive perceptual understanding and is easy to understand The understanding of the concept of parametric vibration of stay cables is beneficial to teaching and scientific research

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