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

Ловейкін, В. С.; Chovniuk, Iurii; Kadykalo, I. O.

doi:10.15593/2224-9923/2016.21.7

Cited by 4 publications

(7 citation statements)

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“…Для первого случая использованы формулы (2) и (3). Таким образом, движущее усилие двигателя при ступенчатом управлении приводом имеет вид -формула (12):…”

Section: результатыunclassified

“…Способ учета движущего усилия двигателя 4 в известных динамических моделях не позволил описать часть введенных расчетных случаев с требуемой точностью 5 , а часть вовсе [12,13,14].…”

Section: Introductionunclassified

“…При подъеме с веса в большинстве динамических моделей [7,10,11,12,14] движущее усилие двигателя на неустановившейся части механической характеристики принимается равным среднепусковому усилию, что, с одной стороны, позволяет сохранить возможность получения аналитического решения во время переходного процесса, но, с другой стороны, снижает точность описания динамических нагрузок и кинематических характеристик.…”

Section: Introductionunclassified

“…По этой причине движущее усилие двигателя учитывается линейной исимостью от текущей скорости двигателя. При подъеме с веса в большинстве динамических моделей [7,10,11,12,14] движущее лие двигателя на неустановившейся части механической характеристики принимается ным среднепусковому усилию, что, с одной стороны, позволяет сохранить возможность учения аналитического решения во время переходного процесса, но, с другой стороны, жает точность описания динамических нагрузок и кинематических характеристик. В динамической модели Н. А. Лобова [15] и моделях, построенных на ее основе, движущее лие двигателя описывается согласно статической механической характеристике по формуле ] = 2𝑥𝑥𝑥𝑥 ̇с; 𝛼𝛼𝛼𝛼 -коэффициент, указывающий часть механической характеристики, на которой работает ктродвигатель; 𝛼𝛼𝛼𝛼 = 0 для работы на линейной части установившейся ветви механической актеристики; 𝛼𝛼𝛼𝛼 = 1 для работы на любой ветви механической характеристики.…”

Section: Introductionunclassified

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Motor driving force of bridge-type crane lifting mechanism under real operating use

Назаров

2023

Vestn. SibADI

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Introduction. The requirement for modelling the dynamic processes of a hoisting mechanism in real operating situations has been revealed. The necessity of increasing the accuracy of moving effort description for the most common types of crane hoist drive control has been determined.Materials and Methods. The operation of a single-speed electric motor with squirrel-cage rotor without speed control, with a phase rotor and additional resistors in the rotor winding and with a squirrel-cage rotor and control by a frequency converter has been considered. The static characteristic of the electric motor is taken as the initial function. The Clauss formula with the corresponding values of the parameters synchronous speed, critical force and critical slip was used to take into account the driving force of the motor for frequency control and for relay-contactor control and a motor with a phase-rotor and additional resistances in the rotor circuit.Results. The dependences for the motor driving force with the most common methods of speed control of the crane hoisting mechanism drive are presented. In the case of the frequency control system, the form of the motor driving force is given in the case of steady-state motion and in the case of transient starting/braking processes when the corresponding algorithms are implemented by a frequency converter. Experimental and theoretical graphs of the load lifting processes for the cases of lifting with pickup in the relay-contactor control system and with elastic pickup in the frequency control system are given.Conclusion. The conclusion about applicability of static mechanical characteristic for description of electric motor operation in crane drives is given. The presented dependences provide an opportunity to model the full working cycle of the hoisting mechanism. The dependences are valid both during steady motion of the mechanism and during transients. It is concluded about the use of the dynamic model taking into account the presented form of the motor driving force for practical purposes for the analysis of the crane operation with regard to the effect of the lifting capacity limiter.

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Section: результатыunclassified

Section: Introductionunclassified

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Motor driving force of bridge-type crane lifting mechanism under real operating use

Назаров

2023

Vestn. SibADI

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“…Analysis of the latest research sources and publications. The calculation of load oscillations is usually carried out according to the simplest scheme of two-mass system [1][2][3][4][5][6][7][8][9][10][11][12][13][14], at that, considering that angle of ropes deflection from vertical does not exceed 10° ... 12° (so called small oscillations). It is also considered that the period of pendulum oscillations of load on flexible ropes is more or the same order as the period of acceleration (braking) of the crane, and the driving force of the driving motor of the travel mechanism is constant and equal to the average starting (braking) value [8,9].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Generalized Force Criterion Optimization of Overhead Cranes Movement Modes

Chovnyuk,

Priymachenko,

Cherednichenko

et al. 2023

Modern Construction and Architecture

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During the operation of overhead cranes, pendulum oscillations of the payload are often observed, which causes uneven movement of these cranes, their trolleys, loads on the ropes and power elements of the cranes, which, in turn, create various inconveniences during their operation, reduce the reliability of the functioning of both the crane as a whole and its individual elements. It is clear that all of these factors must be taken into account in the refined calculations of cranes (especially in the modes of their optimal (with the minimum driving force required for this) start/braking). The paper uses a standard methodology and scheme for calculating pendulum oscillations of a payload on the cables of an overhead crane, which are usually carried out within a two-mass model of a crane system. Further refinements and improvements to the above methodology have been made on the basis of a well-founded generalized force criterion for the quality of crane movement. The dependencies describing the law of motion of the crane system and the law of change in time of the applied driving force during the startup/braking stages were obtained, which satisfy the above-mentioned power criterion and ensure high-quality (smooth) movement of the system during its startup or braking. The law of motion of the crane rotation mechanism (crane drive) at its stopping, as well as the law of motion of the cargo at its lifting by the corresponding crane mechanism and sharp braking, at which the dynamic loads in the drive and in the crane rope, respectively, are minimized, is established. The results obtained in the work can be further used to clarify and improve the existing engineering methods for calculating the start-up modes of overhead cranes both at the stages of their design and in the modes of real operation.

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

Ловейкін¹,

Chovniuk²,

Kadykalo³

2019

Tehnìka ta energetika

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

Cited by 4 publications

References 1 publication

Motor driving force of bridge-type crane lifting mechanism under real operating use

Motor driving force of bridge-type crane lifting mechanism under real operating use

Improvement of the Generalized Force Criterion Optimization of Overhead Cranes Movement Modes

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

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