By using Harmilton's principle and Euler's theory of elastic beam and taking Coriolis force of fluid into consideration,this paper builds the mathematical model for the problem on free vibration of elastic pipe conveying fluid,employs the Galerkin approach to find solutions to the model,analyzes the solutions and obtains corre.

The general expression for the instantaneous potential energy functional of elastic system is given at first, and then the special for the arbitrarily curved and twisted pipe conveying fluid is obtained.

This paper discusses acid rinsing maintenance of hydraulic pipes in hoisting and conveying machinery,including basic procedures and acid liquid compounding.

Through the review of current research in energy flow,the correlation equations of affecting and restricting energy flow are analyzed on the basis of energy flow definition,the reasons of vibrating of the fluid filled pipe are discussed,the methods are explored,and the developing trend on energy flow is predicted.

This paper first explains the reasons of vibration in fluid filled pipe system.

The dispersion equation of structure acoustic coupling system for fluid filled pipes surrounded by elastic media under axisymmetric motion was derived from shell dynamic equation.

A new method is proposed to calculate the critical fl ow velocity of pipes conveying fluid.

A method of Fourier series is proposed to calculate the critical flow velocity of pipes conveying fluid.