The wave equation on a string with great perturbed by longitudinal excitation is deduced,and the approximate solution of the wave equation when the base frequency of the string is about half that of the excitation is obtained.

Study of longitudinal vibration model of mine lifting container;

Experimental study on longitudinal vibration characteristics of pendulum assembly in straight hole;

ANSYS-based finite element analysis method of longitudinal vibration of drilling string and its application;

The test results show that the longitudinal motions of the hybrid monohull s.

Due to the lower efficiency of stratospheric airship s motion control, changing the center of gravity position in order to control airship s longitudinal motion was discussed.

A mathematical model of longitudinal motion control system on SWATH is presented and its experimental platform is established in this paper.

In this paper,one-dimensional vertical vibration model of deep well drilling string is estabilished.

The partial differential equation analyzing the nonlinear vertical vibration of the pile was first derived.

Based on vertical vibration theory,assuming the segment above the defect is a rigid body,and the segment with the defect is a linear spring,an analysis method for the location and level of shallow defect is given.

Based on a typical ship, this paper establishes a model of longitudinal movement and then discusses three ways of disturbance estimation: central difference, corlored Kalman filter and extended Kalman filter.

The code considers both transverse and longitudinal movements in the accelerators using a used 4 order variable step Runge Kutta method to calculate the beam envelope of the transverse movement, the phase oscillation curve of the longitudinal movement, the energy growth, the energy distribution at the exit, and the longitudinal electric and magnetic field distributions.