Analysis of crane track degradation due to operation

Kuľka, Jozef; Mantič, Martin; Fedorko, Gabriel; Molnár, Viktor

doi:10.1016/j.engfailanal.2015.11.009

Cited by 24 publications

(15 citation statements)

References 19 publications

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“…The workpiece undergoes a local high-frequency thermal impact when cutting with a wheel grain, which determines the instantaneous grinding temperature. This is clearly confirmed by the results of the researches [4,13]. 3.…”

Section: Methodology Of Researchsupporting

confidence: 77%

Workpiece Temperature Variations During Flat Peripheral Grinding

Смирнов

Repko

2018

Management Systems in Production Engineering

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Abstract:The paper presents the results of researches of temperature variations during flat peripheral grinding. It is shown that the temperature variations of the workpiece can reach 25...30% of the average values, which can lead to some thermal defects. A nonlinear two-dimensional thermophysical grinding model is suggested. It takes into account local changes in the cutting conditions: the fluctuation of the cut layer and the cutting force, the thermal impact of the cutting grains, and the presence of surface cavities in the intermittent wheel. For the numerical solution of the problem, the method of finite differences is adapted. Researches of the method stability and convergence are made, taking into account the specific nature of the problem. A high accuracy of the approximation of the boundary conditions and the nonlinear heat equation is provided. An experimental verification of the proposed thermophysical model was carried out with the use of installation for simultaneous measurement of the grinding force and temperature. It is shown that the discrepancy between the theoretical and experimental values of the grinding temperature does not exceed 5%. The proposed thermophysical model makes it possible to predict with high accuracy the temperature variations during grinding by the wheel periphery.

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Section: Methodology Of Researchsupporting

confidence: 77%

Workpiece Temperature Variations During Flat Peripheral Grinding

Смирнов

Repko

2018

Management Systems in Production Engineering

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“…The Failure and Mode Effect Analysis was used to assess the risks. This method is suitable for assessing the different stages of the life cycle of the system / product and for various cases, each having a different scope of focus [7][8][9][10]. In the said case, the FMEA method was used in the existing process to ensure a reduction of failures in the analysed system, taking into consideration the influence of the environment and location of the existing process.…”

Section: Risk Assessment Using the Fmea Methodsmentioning

confidence: 99%

The use of the FMEA method for the evaluation of failures in crawler cranes

Strohmandl¹,

Tomek

Vargová

et al. 2019

MATEC Web Conf.

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The use and operation of crawler cranes in the Czech Republic is dependent on the availability of several major producers (Liebherr, Caterpillar, Volvo, Sennebogen, etc.) and Czech producers (Unex Uničov with its successor ND LOR Uničov, Tatra and others). The authors of this article explain the problems of operation, repairs and risks of failures in specific types of crawler cranes supplied by Liebherr during their operation in the steelmaking company Třinecké železárny, a.s. and Trilet Ground Services, a.s., the company specialized in renting machines that are used for foundations of buildings. The article proceeds from the evaluation of the operational data of both delivered and repaired machines and the data obtained from the repair company needed for the commissioning of the serviced machine, as well as the frequency of repairs during the specified hours of work within the course of operation of the machines. The processed data serves as a basis for the evaluation of risk of possible failures when using machines. Risks are evaluated using the FMEA method.

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“…The dynamic optimization design model for crane vibration can be obtained by selection of a design variable , depending on the requirements of the optimization, by minimizing (15) while meeting the constraint conditions of vibration equations (6), (16), and (29). Although the mathematical model of the dynamic optimization design is proposed based on the crane structure, it includes all of the conditions and procedures of dynamic optimization design modeling problems of the mechanical and structural systems under the transient input conditions.…”

Section: Mathematical Model For Design Optimizationmentioning

confidence: 99%

“…Raymond [15] analyzed the cause of failure of heavy gantry cranes that occurred in 1985 and found that rail defects were constantly subjected to vibratory shocks during reciprocating motion. Kulka et al [16] identified a variety of factors, including vibrations, which cause damage to a crane's rail. According to Rettenmeier et al [17], when a moving load is subjected to rail vibration, rail cracks are propagated in crane rails, which results in a vicious circle of increased vibration and cracking.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Optimization Design of Cranes Based on Human–Crane–Rail System Dynamics and Annoyance Rate

Xin

2017

Shock and Vibration

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The operators of overhead traveling cranes experience discomfort as a result of the vibrations of crane structures. These vibrations are produced by defects in the rails on which the cranes move. To improve the comfort of operators, a nine-degree-of-freedom (nine-DOF) mathematical model of a “human–crane–rail” system was constructed. Based on the theoretical guidance provided in ISO 2631-1, an annoyance rate model was established, and quantization results were determined. A dynamic optimization design method for overhead traveling cranes is proposed. A particle swarm optimization (PSO) algorithm was used to optimize the crane structural design, with the structure parameters as the basic variables, the annoyance rate model as the objective function, and the acceleration amplitude and displacement amplitude of the crane as the constraint conditions. The proposed model and method were used to optimize the design of a double-girder 100 t–28.5 m casting crane, and the optimal parameters are obtained. The results show that optimization decreases the human annoyance rate from 28.3% to 9.8% and the root mean square of the weighted acceleration of human vibration from 0.59 m/s2to 0.38 m/s2. These results demonstrate the effectiveness and practical applicability of the models and method proposed in this paper.

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Analysis of crane track degradation due to operation

Cited by 24 publications

References 19 publications

Workpiece Temperature Variations During Flat Peripheral Grinding

Workpiece Temperature Variations During Flat Peripheral Grinding

The use of the FMEA method for the evaluation of failures in crawler cranes

Dynamic Optimization Design of Cranes Based on Human–Crane–Rail System Dynamics and Annoyance Rate

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