Analysis of Contact Deformations in Support Systems Using Roller Prisms

Nozdrzykowski, K.; Grządziel, Zenon; Dunaj, Paweł

doi:10.3390/ma14102644

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…The implementation of variable support reaction forces ensures the elimination of the elastic deformation of the crankshafts, which distorts the measurements of the geometric quantities. This fact has also been verified experimentally in previous works [5,26]. As emphasized at the beginning of this paper, observations made during earlier research suggested that the implementation of the variable reaction forces could result in different values of the reaction forces on the rollers of the prism heads that support the crankshaft compliant support system.…”

Section: Discussionsupporting

confidence: 79%

“…This specificity results from large dimensions that distinguish them from other crankshafts [1,2]. When characterizing the large-sized crankshafts, it should be emphasized that these are components with large weights and dimensions, and at the same time variable rigidity, which makes them susceptible to bending deformations [3][4][5]. Such crankshafts have small cross-sectional dimensions in relation to their length and a number of additional design details that differ from simple shafts [6,7].…”

Section: Introductionmentioning

confidence: 99%

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An Analysis of Reaction Forces in Crankshaft Support Systems

et al. 2022

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During measurements, the crankshafts of marine engines are usually supported on a set of rigid prisms. Such prisms maintain a constant height position, cause different values of reaction forces and, consequently, may cause elastic deformations of the crankshafts. Thus, the measurements of the dimensions and geometry of the crankshaft may be distorted. This article proposes a measuring system developed to support the crankshaft with a set of flexible supports. These supports implemented the given reaction forces, which ensured the elimination of the crankshaft deformations, regardless of the possible deviations, i.e., in the coaxiality of the main crankshaft journals. The values of these forces were calculated using the finite element method (FEM). These calculations showed that in order to eliminate the crankshaft deformations, the values of the reaction forces must change not only on individual supports, but also with the change of the shaft rotation angle during the measurement. The numerical experiments showed that the application of flexible supports results in uniform contact reaction forces on adjacent main journal supports. This uniformity occurs regardless of the quality of the crankshaft geometry. Thus, the necessity to use a set of flexible supports for measuring marine engine crankshafts was confirmed. The research also showed that the values of the reaction forces ensuring the elimination of shaft deflections under the assumption of nodal support can be treated as corresponding to the resultant reaction forces realized by the prismatic heads.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

An Analysis of Reaction Forces in Crankshaft Support Systems

et al. 2022

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“…For the steel balls being used in the DBT, the Young's modulus and Poisson ratio have been given as 210 GPA and 0.28, [20] respectively. If these values are inserted into Equation (7), then the maximum pressures Pmax, for the three ball sizes will be as presented in Table 4 It can be observed that there is an almost perfect linear correlation between the radius and Pmax as shown in Figure 5.…”

Section: Drop Ball Test (Dbt) Resultsmentioning

confidence: 99%

Using Discrete Element Method to Analyse the Drop Ball Test

Chimwani,

Bwalya,

Samukute

2024

Minerals

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The drop ball test (DBT) is a common quality control procedure used in many grinding media manufacturing units to evaluate the quality of manufactured balls. Whilst DBTs have provided reasonable data over many years, the quantitative comparison of the energy that the balls are subjected to during the DBT and in high-impact loading environments such as semi-autogenous grinding (SAG) mills remains a grey area. To that end, DBT experiments were conducted, and the discrete element method (DEM) was used to assess the grinding media collision behaviour and the extent of ball impact loading to determine the impact energy spectra of the ball collisions. The impact energy spectra data obtained were used to quantify the energy that the grinding balls are exposed to in the DBT environment. The results showed that larger balls were exposed to relatively higher energy levels and had a higher probability of fracture than smaller balls. Furthermore, early ball breakage in a grinding environment is mostly attributed to the existence of imperfections or pre-existing defaults within the ball, whilst continuous wear is a gradual consequence that deplete balls in the mill.

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“…Pawełko proposed a finite element modeling method considering the preload force of linear rolling guides and compared the solid modeling method with the spring cell method, which finally verified the superiority of the spring cell method in terms of modeling efficiency and modeling accuracy [7] . Nozdrzykowski analyzed the strains and stresses in the support rollers of a large crankshaft spindle based on finite element modeling and verified experimentally [8] . Dunaj performed a finite element simulation analysis of the linear guide stiffness with preload by changing the rollers to rod elements of equal stiffness [9] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Finite Element Simulation of the Linear Rolling Guide Pair Error Averaging Effect

Lin,

Tian,

Zheng

et al. 2024

Frontiers in Artificial Intelligence and Applications

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This paper studied the error averaging effect of the linear guide pair based on finite element simulation method and proposed an assembly process to improve the accuracy of the kinematic subassembly. Firstly, a finite element modeling of a linear rolling guide pair is developed. The error transfer relationship between guide and kinematic subassembly is researched by simulating different combinations of guide errors. Secondly, the linear rolling guide pair experimental bench is built to experimentally verify, and the experimental results coincided with simulation analysis. Finally, in order to improve the accuracy of the kinematic parts, an assembly process is proposed.

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Analysis of Contact Deformations in Support Systems Using Roller Prisms

Cited by 6 publications

References 30 publications

An Analysis of Reaction Forces in Crankshaft Support Systems

An Analysis of Reaction Forces in Crankshaft Support Systems

Using Discrete Element Method to Analyse the Drop Ball Test

Analysis of the Finite Element Simulation of the Linear Rolling Guide Pair Error Averaging Effect

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