Abstract
The problem of increase of durability of the bearing thin walled metal structures of hoisting - and - transport machines maybe solved by means of structural damping which allows to increase the logarithmic decrement of the damped oscillations. In the work there are given the results of modelling and experimental check of the advantages of usage low-modulus foam materials as fillers at a structural damping of thin walled elements of metal structures. With the help of computational package SolidWorks there was conducted a numerical study to define amplitude-frequency characteristic of laboratory machine and then there were run the tests of model structure with building vibrorecord. As a result if research there was revealed a significant increase of the logarithmic decrement and reduction of the time of decay of natural oscillation of the foamed structure. Consequently, there are shown the advantages of the further researches to use energy-intensive foam materials to dampen the elements of the structures of handling machinery.
Highlights
In the building industry and aircraft manufacturing sandwich plate and shells have been used for a long time and successfully, which have a layer of low-modulus energy-intensive material
The problem of increase of durability of the bearing thin walled metal structures of hoisting - and - transport machines maybe solved by means of structural damping which allows to increase the logarithmic decrement of the damped oscillations
In the work there are given the results of modelling and experimental check of the advantages of usage low-modulus foam materials as fillers at a structural damping of thin walled elements of metal structures
Summary
In the building industry and aircraft manufacturing sandwich plate and shells have been used for a long time and successfully, which have a layer of low-modulus energy-intensive material. Filling of the working in bending thin walled structures of a box section with a light low modulus foam material effectively damps free oscillations Such a conclusion is rendered by numerous and natural tests which revealed a significant increase of the decrement of the beam free oscillations [1,2]. The calculated time of dampening of the oscillations decreases with decrease of the wall thickness of the beam section and growth of logarithmic decrement of the oscillations This conclusion of the numerous experiment is qualitatively confirmed by the results of steel structure with a width 0,mm in laboratory conditions. The processed results of the experiments are given in table 2; logarithmic decrement of dampening, oscillations interval, eigen frequency, number of significant cycles and dampening time.
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