Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

Grabiec, Jakub; Pajor, M.; Dunaj, Paweł

doi:10.3390/ma15196797

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…This problem affects a wide range of industries, including the mechanical, civil, aerospace, automotive, and marine industries. Variable loads can cause vibrations with different characteristics which adversely affect the structure and operation of the machine [ 1 , 2 , 3 , 4 ]. Therefore, a key parameter to consider when designing a machine and its dynamic properties is structural damping.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is not always possible to design a machine from scratch or significantly modify an already existing one. For this reason, methods to eliminate vibrations are being studied, not only for new structures, such as a frame for a delta robot [ 2 ], but also for existing ones [ 5 , 6 ]. Methods to suppress vibrations, as well as the negative effects caused by them, can be divided into three main groups: (i) active, (ii) passive, and (iii) semi-active, which is the combination of both active and passive methods [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

et al. 2023

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Structural damping largely determines the dynamic properties of mechanical structures, especially those whose functioning is accompanied by time-varying loads. These loads may cause vibrations of a different nature, which adversely affects the functionality of the structure. Therefore, many studies have been carried out on vibration reduction methods over the last few years. Among them, the passive vibration damping method, wherein a suitable polymer system with appropriate viscoelastic properties is used, emerges as one of the simplest and most effective methods. In this view, a novel approach to conduct passive elimination of vibrations, consisting of covering elements of structures with low dynamic stiffness with polymeric pads, was developed. Herein, polymer covers were manufactured via fused filament fabrication technology (3D printing) and were joined to the structure by means of a press connection. Current work was focused on determining the damping properties of chosen polymeric materials, including thermoplastic elastomers (TPE). All investigated materials were characterized by means of differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and mechanical properties (tensile test and Shore hardness). Lastly, the damping ability of pads made from different types of polymers were evaluated by means of dynamic tests.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

et al. 2023

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Dynamic characteristics of disc brake systems of a high-speed train with wheel polygonal wear

Yang,

Zhang,

Zhao

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part F:

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The brake system is a key component of a high-speed train, which suffers intense wheel-rail interactions caused by wheel polygonal wear (WPW) in realistic working conditions. To explore the dynamic characteristics of the disc brake systems with WPW, a rigid-flexible coupled vehicle dynamics model is proposed. The developed model systematically takes into account the flexible deformation of brake components and wheelsets, measured WPW and non-linear factors such as wheel-rail interaction, disc-pad friction and non-linear damping characteristics. It allows the dynamic behaviors of the vehicle brake system in service to be accurately and effectively revealed. The model is verified using line test data, and then the dynamic characteristics of disc brake systems with WPW are investigated in details. The results show that for vehicle speed below 80 km/h and depths of WPW below 0.04 mm, the effect of WPW on the vibration of the caliper is slight. However, as vehicle speed and wear depth continue to rise, the vibration of the caliper increases noticeably. Furthermore, the effects of vehicle speed and wear depth on brake disc vibration are more obvious, and increasing vehicle speed and wear depth will steadily deteriorate the vibration of the disc. Besides, the effect of WPW is particularly pronounced on the dynamic behavior of the brake units closer to the wheels. Overall, the influence of wheel polygon cannot be neglected in the study of dynamic characteristics of brake system. At the same time, the proposed model can also be applied in the strength evaluation of brake components and the study of the tribological behaviors within the brake interface.

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Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

Cited by 2 publications

References 24 publications

Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

Dynamic characteristics of disc brake systems of a high-speed train with wheel polygonal wear

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