scholarly journals Updated analysis and minimization of dynamic loads in elastic elements of lifting equipment

2016 ◽  
Vol 21 ◽  
pp. 354-361 ◽  
Author(s):  
Viacheslav Loveikin ◽  
Iurii Chovniuk ◽  
Ivan Kadykalo
Keyword(s):  
Dynamic Loads ◽  
Lifting Equipment ◽  
Elastic Elements

scholarly journals Computer model of electric drive of 1L100K conveying unit

2019 ◽  
Vol 134 ◽  
pp. 01012
Author(s):  
Denis Zolkin ◽  
Vadim Petrov
Keyword(s):  
Control System ◽  
Electric Drive ◽  
Ring System ◽  
Vibration Damping ◽  
Electromechanical System ◽  
Dynamic Loads ◽  
Belt Conveyor ◽  
Electric Drives ◽  
Belt Conveyors ◽  
Elastic Elements

The paper deals with the problems of vibration damping and limiting dynamic loads in the electromechanical system of a belt conveyor by means of an adjustable electric drive. A conveying unit is represented as a three-mass ring system, which corresponds to a conveying unit with cinematically closed tape. The development of the structure of the control system for electric drives of belt conveyors with limited dynamic loads in elastic elements will reduce the dynamic loads on the belt and therefore the wear of the belts. Conditions of damping of oscillations in electromechanical system of belt conveyors are defined.

DRIVE COUPLING WITH SPLIT STEEL SLEEVES

2020 ◽  
pp. 32-34
Author(s):  
V. M. Zyablikov ◽  
B. V. Buketkin ◽  
V. F. Smirnov ◽  
A. A. Shirshov
Keyword(s):  
Torsional Rigidity ◽  
Gear Wheel ◽  
Dynamic Loads ◽  
Torsional Vibrations ◽  
Small Curvature ◽  
Elastic Elements

The main purpose of couplings with elastic elements is to reduce dynamic loads and reduce the level of dangerous vibration amplitudes. Sometimes it is necessary for this purpose to install such couplings directly in the units, since they have large amplitudes of torsional vibrations. Drive couplings with elastic elements – steel split sleevescan be installed inside the units. The design of the coupling, which is built into the gear wheel of the reducer, is shown. The main characteristic of drive clutches with elastic elements is torsional rigidity. A detailed output of the formula for calculating the stiffness of such couplings is given. The conclusion is based on determining the deformation of split sleeves taken as rods of small curvature.

scholarly journals Optimisation of dynamic loads in elastic elements of load lifting cranes with different methods of lifting. Part II

2019 ◽  
Vol 10 (4) ◽  
pp. 5-11
Author(s):  
V. S. Loveykin ◽  
◽  
Yu. V. Chovniuk ◽  
I. O. Kadykalo ◽  
◽  
...  
Keyword(s):  
Dynamic Loads ◽  
Elastic Elements

scholarly journals Determining the dynamic characteristics of elastic shell structures

2021 ◽  
Vol 6 (7 (114)) ◽  
Author(s):  
Irina Polyakova ◽  
Raikhan Imambayeva ◽  
Bakyt Aubakirova
Keyword(s):  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Elastic Shell ◽  
Physical And Mechanical Properties ◽  
Frequency Characteristics ◽  
Dynamic Loads ◽  
Measuring Instruments ◽  
Building Structures ◽  
Elastic Elements

Building structures are very often operated under the action of dynamic loads, both natural and man-made. The calculation of structures under the influence of static loads has been quite widely studied in detail. When structures are exposed to dynamic loads, additional tests are carried out, where measuring instruments are installed on the structures to register stresses and deformations that occur during dynamic influences. Elastic elements are the responsible functional unit of many measuring instruments. Therefore, the quality of elastic elements ensures the operational stability of the entire structure. This determines the increased attention that is paid to technology and construction to elastic elements. Previously, the work of elastic elements made of homogeneous mono materials with the same physical and geometric properties in all directions and over the entire surface of the element was studied. The elastic element was considered as a shell of rotation with a complex shape of the meridian and various physical and mechanical properties at various points caused by uneven reinforcement. Two types of reinforcement were implied ‒ radial and circular. Elastic shell elements (ESE) operate under conditions of dynamic loading. The equation was derived for determining the dynamic characteristics of inhomogeneous elastic elements. The dependences of the first three natural frequencies of oscillations on the thickness of the shell and the depth of the corrugation and the first two natural frequencies of oscillations on the thickness of the shell have been analyzed. The amplitude-frequency characteristics (AFC) and the phase-frequency characteristics (PFC) of the shell depending on the geometric parameters have been calculated. All these results could significantly improve the quality of the readings of the instruments, which depend on the sensitivity of the shell elastic elements. And it, in turn, depends on the geometric and physical properties of the shell elastic elements.

Study of the dynamics of ТПА 350 automatic mill working stand elements

2020 ◽  
Vol 76 (8) ◽  
pp. 830-840
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotnii
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Maximum Amplitude ◽  
Calculation Scheme ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Mass Model ◽  
Automatic Mill ◽  
Hollow Billet ◽  
Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

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