The Latest Methods of Construction Design

Dynybyl, Vojtěch; Berka, Ondrej; Petr, Karel; Lopot, František; Dub, Martin

doi:10.1007/978-3-319-22762-7

Cited by 8 publications

(2 citation statements)

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“…Kalavalapally and co-workers [16] solving a multidisciplinary optimization problem for a lightweight torpedo model subjected to underwater explosions observed that the composite torpedo model is stronger and lighter than the metallic design when subjected to an underwater explosions at a given standoff distance. The paper [17] presented the numerical method and results of the structural optimization of the mounting zones of wind turbine blades to diminish and flatten the stress distribution at the action of the extremely stressed wind load on the blade, which had the stiff carbon/epoxy composite skin and less stiff lightweight core body.…”

Section: • Detailed Design: Ply Stacking Sequence Optimizationmentioning

confidence: 99%

Optimization of Lay-Up Stacking for a Loaded-Carrying Slender Composite Beam

Shevtsov¹,

Zhilyaev²,

Snezhina³

et al. 2019

Optimum Composite Structures

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Many aircraft composite structures experiencing the high operational loads must have the specified mechanical stiffness to prevent some structural failure due to the inadmissible deformations. Usually, such parts are manufactured using composites with orthotropic symmetry, which provides the best combination of structural rigidity, strength, and weight. In this chapter, we consider a cantilevered long tube-like composite structure with varied cross-section that is manufactured by winding of glass fiber unidirectional tape. The operational loads include the bending forces and the distributed torques. To reduce the total strain energy and peak von Mises stress, the search of the best lay-up scheme and its angles is performed. The wall thickness, lay-up scheme, and the total number of layers for each modeled design are assumed as unchanged along the tube, whereas its mechanical properties are considered as homogenized and dependent on the lamina properties and lay-up scheme only. The search of the pseudo-optimal design includes the analysis of all moduli angular distributions for each lay-up stacking. The better solutions are then studied by using the finite element model of the structure for three most critical load scenarios. The choice of the most preferred design is made by discarding the solutions with sharply degraded structural rigidity at least at one load scenario.

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Section: • Detailed Design: Ply Stacking Sequence Optimizationmentioning

confidence: 99%

Optimization of Lay-Up Stacking for a Loaded-Carrying Slender Composite Beam

Shevtsov¹,

Zhilyaev²,

Snezhina³

et al. 2019

Optimum Composite Structures

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show abstract

“…• Reducing the wheel-rail traction forces; sliding velocities, by the application of friction modifiers (FM) in the railhead. The cyclic loading, in presence of FMs, forms an interfacial layer which would reduce the friction through the suspension constituents [12].…”

Section: Introductionmentioning

confidence: 99%

Friction modifiers effects on tribological behaviour of bainitic rail steels

Messaadi

Oomen

Kumar

2019

Tribology International

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Bainitic steels are gaining popularity for application in the railway switches and crossing, thanks to their better rolling contact fatigue (RCF) and wear resistance. The rail degradation caused by RCF and wear could be also reduced by the use of friction modifiers (FM) through their ability to reduce the lateral load during wheel passage. This paper presents the microstructure and the mechanical properties of newly designed bainitic steel grades; B1400+ and Cr-B potential candidates for switches and turnouts railroad industry. It investigates their friction and wear performances using the HOrizontal twin DIsk Machine. The tribological behavior is evaluated under dry and lubricated conditions in combination with three commercial friction modifiers. Results show a better wear resistance of Cr-B steel in case of abrasive mechanism that dominates the dry experiments. This work defines the efficiency of FM as a low and stable friction coefficient concomitant to a low wear rate. It appears that a good tribological performance is untimely linked to the chemical composition of the friction modifier. In case of lubricated contact, cross-sectioning of wear scare confirms the generation of an interfacial layers. These layers have an impact on the wear mechanism and debris detachment susceptibilities of bainitic steels.

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Identification of safety hazards and operating conditions of the low-floor tram with independently rotating wheels with various drive control algorithms

Konowrocki¹,

Kalinowski²,

Szolc³

et al. 2021

Eksploatacja i Niezawodność – Maintenance and Reliability

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The aim of the article is to develop a method for the analysis of tram dynamics related to safety during operation. To achieve this, a mathematical model of the vehicle represented by a multibody simulation MBS system is used. Models of tram with a classic and innovative drive, based on a system of independently rotating wheels on crank axles are analyzed. A new configuration of an innovative drive control of the considered vehicle with the use of braking of independent wheels is proposed. A new geometry of test track is presented. During numerical investigation the values of ‘Y’ leading forces of tram wheels with the considered innovative drive proved to be lower than in the corresponding vehicle with standard wheelsets. It has been demonstrated that the active control systems are of key importance and should be applied in such innovative tram drives.

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The Latest Methods of Construction Design

Cited by 8 publications

References 0 publications

Optimization of Lay-Up Stacking for a Loaded-Carrying Slender Composite Beam

Optimization of Lay-Up Stacking for a Loaded-Carrying Slender Composite Beam

Friction modifiers effects on tribological behaviour of bainitic rail steels

Identification of safety hazards and operating conditions of the low-floor tram with independently rotating wheels with various drive control algorithms

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