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Strength analysis of a telescopic hydraulic cylinder elastically mounted on both ends

Uzny Sebastian, Kutrowski Łukasz

Journal of Applied Mathematics and Computational Mechanics

2019

Vol. 18, nr 1

89--96

Corrosion or contamination of flexible joints of a telescopic hydraulic cylinder may cause an increase of movement resistance in these places. In this work the influence of mounting rigidity on the strength of a telescopic hydraulic cylinder is under consideration. Buckling criterion and the strength of cylinder barrels (material effort) were included due to analysis. Boundary value problem concerning the stability of the system was formulated on the basis of the static stability criterion. Lame’s theory for thick pipes were used for determination of destructive load from the viewpoint of the material effort. Numerical simulations were performed. The results specifying the influence of mounting rigidity on stability and strength of cylinder barrels were presented by using non-dimensional parameters.

The Effect of the Type of Mounting on Stability of a Hydraulic Telescopic Cylinder

Uzny S., Kutrowski Ł.

Machine Dynamics Research

2018

Vol. 42, No. 2

53--60

This paper revolves around the boundary value problem regarding the stability of a telescopic hydraulic cylinder. The effect of its mounting type on the maximum load able to move without being damaged by buckling was examined. The formulation of the boundary problem was carried out on the basis of the static stability. The results were presented in a dimensionless form. The inﬂuence of the type of mounting of the telescopic hydraulic cylinder on the bearing capacity of the system was determined, taking into account changes in cylinder and seals thickness parameters and stiffness of connections between following elements. The results are presented for a three-stage and a ﬁve-stage hydraulic telescopic cylinder.

The effect of torsional rigidity between elements on free vibrations of a telescopic hydraulic cylinder subjected to Euler’s load

Uzny S., Kutrowski Ł.

Journal of Applied Mathematics and Computational Mechanics

2017

Vol. 16, nr 3

117--122

The boundary problem of free vibrations of a hydraulic telescopic cylinder, subjected to Euler’s load was presented in this work. The task was formulated on the basis of the Hamilton’s principle. The computational model, formulated by Tomski, was taken into account during analysis. Numerical calculations concern free vibrations of multi-stage hydraulic telescopic cylinder. Results were presented in the form of characteristic curves on the plane: external load-natural vibration frequency. Non-dimensional parameters of the structure were defined in reference to the characteristic parameters of the piston rod. During numerical simulations, an influence of a non-dimensional stiffness parameter between following elements on free vibrations of a hydraulic telescopic cylinder was determined for a different number of cylinder stages.