Оptimizing the mode of swing operation of jib crane is solved by criterion of rms value of acceleration of change in force in drive mechanism

Ловейкін, В. С.; Romasevych, Yu. O.; Ловейкін, А. В.; Kadykalo, I. O.

doi:10.31548/machenergy2019.03.005

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…To conduct experimental studies, a physical model of the jib crane rotation mechanism was constructed [30], the 3D model of which is shown in Fig. 1 and the scheme of the jib crane is shown in Fig.…”

Section: Research Resultsmentioning

confidence: 99%

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Construction of physical model of jib crane rotation mechanism, program and description of experimental studies

Ловейкін

Romasevych²,

Kadykalo³

2021

Tehnìka ta energetika

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This article outlines the main provisions of the program, methodology, description of the object of experimental studies and construction of a physical model of the jib crane rotation mechanism. A real QTZ 80 crane has been chosen for the study, which differs from the laboratory installation (physical model) of the jib crane rotation mechanism by structural, power and energy parameters, for this reason, experimental studies used physical modeling, which usually changes the scale and leaves the physical nature of phenomena. Therefore, similarity theory is used to determine the characteristics of the physical model. A physical model (laboratory unit) of the jib crane rotation mechanism was designed to conduct experimental studies on the similarity theory. This model is prepared for experimental studies of the dynamics of the rotation mechanism during the start-up process. To determine the similarity criteria, equations of motion were used that reflect the operation of the jib crane rotation mechanism, namely the three-mass dynamic model of the rotation mechanism, which is a system of three second-order differential equations. Using the obtained ratios of similarity criteria, the numerical values of the similarity coefficients of the real rotation mechanism of the jib crane and its physical model are determined. Based on the parameters obtained, a physical model of a full-scale jib crane rotation mechanism was constructed. The results obtained in this study can be further used to refine and improve existing engineering methods for calculating the mechanisms of rotation of cranes, both at the stages of their design/construction, and in real operation.

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Section: Research Resultsmentioning

confidence: 99%

“…As a result of certain mathematical transformations and reductions, we obtain the ratio between the similarity coefficients [30]:…”

Section: Construction Of Physical Model Of Jib Crane Rotation Mechani...mentioning

confidence: 99%

Construction of physical model of jib crane rotation mechanism, program and description of experimental studies

Ловейкін

Romasevych²,

Kadykalo³

2021

Tehnìka ta energetika

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“…In addition, the optimal trajectory of the cargo cart motion is found, by which the acceleration of this motion is minimized in the process of acceleration of the cargo cart to a stable, normative value of the speed of motion. Modeling, analysis and optimization of cargo cart movement by overhead cranes which in its turn causes minimal deviation of cargo from vertical and reduces essentially arising pendulum vibrations in overhead cranes are based on the results obtained in papers [17][18][19][20].…”

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confidence: 99%

“…Substituting (18) into the conditions (19), we find a system of linear algebraic equations for finding the constants С 0 , С 1 , С 2 , С 3 of the following kind:…”

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confidence: 99%

Modeling and Optimization of the Processes of Movement and Acceleration of the Overhead Crane Trolley in the Mode of Damping Uncontrolled Load Oscillations

Chovnyuk¹,

Priymachenko²,

Cherednichenko³

et al. 2023

Modern Construction and Architecture

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The paper deals with the modeling and optimization of the processes of movement and acceleration of a bridge crane trolley in the mode of damping uncontrolled oscillations of the load. For the dynamic system of a flat pendulum with vibration damping, which describes the oscillations of a bridge crane load on a flexible rope suspension in a separate vertical plane, it is proposed to use third-order time splines that model the motion and acceleration of the load suspension point in the horizontal direction of the trolley's movement. To determine the time dependence of the angle of deviation of the crane from the gravitational vertical, it is proposed to use the methods of classical calculus of variations (Euler-Poisson equation), which allow optimizing (minimizing) the value of this angle in the process of accelerating a trolley with a load suspended from the ropes of an overhead crane. An analytical solution to the problem of damping residual uncontrollable oscillations of the overhead crane load, which usually occur after full acceleration or braking of the load suspension point on the trolley, is obtained. To derive the dependencies, an analytical approach was used to calculate the value of the angle of deviation of the overhead crane's cargo rope from the gravitational vertical, depending on the acceleration and displacement of the load suspension point. The problem of loosening of a load moved by an overhead crane is considered and solved in a new way that allows to completely avoiding pendulum spatial oscillations of the load on a rope suspension. The mathematical apparatus of linear algebra (Kramer's rule, in particular) is used, which allows us to establish analytically the law of time motion of a rope with a load, the angle of deviation of which from the vertical takes minimum values in the process of acceleration of the cargo trolley.

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Оptimizing the mode of swing operation of jib crane is solved by criterion of rms value of acceleration of change in force in drive mechanism

Cited by 2 publications

References 11 publications

Construction of physical model of jib crane rotation mechanism, program and description of experimental studies

Construction of physical model of jib crane rotation mechanism, program and description of experimental studies

Modeling and Optimization of the Processes of Movement and Acceleration of the Overhead Crane Trolley in the Mode of Damping Uncontrolled Load Oscillations

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