Redesign and an Optimalization of a Bicycle Rear Wheel Suspension

Import 02/11/2016Diplomová práce se zabývá konstrukčním návrhem zadní kyvné vidlice horského kola a jejího zavěšení. V úvodu práce je vypracována rešerše běžně sériově vyráběných kyvných vidlic a jejich způsobu uchycení k rámu. Dále je proveden rozbor požadovaného principu konstrukce a fungování kyvné vidlice a je vypracován návrh optimalizovaného řešení. Výpočtová část se zabývá rozborem sil, které na bicykl, potažmo vidlici působí a jejich výslednými reakcemi v uložení vidlice a pákách. Na základě tohoto rozboru je dimenzována nová vidlice a páky. Pevnostní výpočet navržené konstrukce je proveden metodou konečných prvků. Dále jsou provedeny výpočty ložisek, pevnostní kontroly čepů a je navržen dvoustupňový ozubeno-řetězový převod. Kritická místa jsou rovněž výpočtem zkontrolována. Součástí práce je výkres kompletní sestavy navržené konstrukce, výrobní výkres svařence vidlice a výrobní výkres vloženého kola.This diploma thesis deals with an engineering design of a rear springing fork on the Race Bike company bicycle. The introduction of the thesis provides a review of the commonly wholesale produced rear suspension designs, springing forks and the ways of their attachment to the frame. Further there is provided an analysis of the suggested engineering design of the fork and a concept of a new design is drawn up. Calculation part of thesis is dedicated to the forces which the fork is exposed to and the resulting reactions of the bearings and joints. On the basis of this analysis a new springing fork is dimensioned. Strength calculation of the devised design is carried out by the finite element method. Next, lifetime calculations of the bearings and tenons are performed. The design drawing of the complete fork assembly, welded fork assembly drawing and the working drawing of the idler gear are included.347 - Katedra částí a mechanismů strojůvýborn

Comprehensive view of topological optimization scooter frame design and manufacturing

The combination of topology optimization (TO) and 3D printing has revolutionized the way components are designed and fabricated. In view of this, this manuscript presents a TO workflow considering the frame of a scooter. In particular, TO is employed to redesign the scooter frame based on a commercial one. The topologically optimized frame is then fabricated with stainless steel 316L utilizing the selective laser melting (SLM) method. In particular, technical obstacles encountered during the process and according solutions are recorded. Given the herein notes, readers who are working with the two technologies can anticipate the technical problems and deliver more effective solutions should any of them arise.Web of Science137art. no. 120

Redesign of a Motorcycle Rear Fork Spring

Import 26/06/2013Bakalářská práce se zabývá konstrukčním návrhem zadní kyvné vidlice motocyklu Jawa 350/634. V úvodu práce je vypracována rešerše běžně sériově vyráběných kyvných vidlic a jejich způsobu uchycení k rámu. Dále je proveden rozbor konstrukce kyvné vidlice u motocyklu Jawa 350/634 a je vypracován návrh nového řešení. Výpočtová část se zabývá rozborem sil, které na vidlici působí a jejich výslednou reakcí v ložiscích. Na základě tohoto rozboru je dimenzována nová vidlice. Pevnostní výpočet navržené konstrukce je proveden metodou konečných prvků. Dále jsou provedeny výpočty ložisek, pevnostní kontrola čepu a je navržena nová rozeta, jejíž kritická místa jsou rovněž výpočtem zkontrolována. Vyměnitelný věnec rozety je zkontrolován metodou konečných prvků. Součástí práce je výkres kompletní sestavy navržené konstrukce a výrobní výkres vyměnitelného věnce rozety.This bachelor thesis deals with an engineering design of a rear springing fork on the Jawa 350/634 motorcycle. The introduction of the thesis provides a review of the commonly wholesale produced springing forks and the ways of their attachment to the frame. Further there is an analysis of the engineering design of fork on the Jawa 350/634 motorcycle and a concept of a new design is drawn up. Calculation part of thesis is dedicated to the forces to which the fork is exposed and the resulting reaction of the bearings Calculation part of thesis deals with force parsing, which fork is exposed to and the resulting reaction to bearings. On the basis of this analysis a new springing fork is dimensioned. Strenght calculation of the devised design is carried out by the finite element method. Next, strenght calculations of the bearings and tenon are performed and a new rosette is designed and checked. Replaceable rosette wreath is checked by the finite element method. The design drawing of the complete fork assembly and the working drawing of the replaceable rosette wreath are included.Prezenční347 - Katedra částí a mechanismů strojůvýborn

Design procedure of a topologically optimized scooter frame part

This article describes the design procedure of a topologically optimized scooter frame part. It is the rear heel of the frame, one of the four main parts of a scooter made with stainless steel 3D printing. The first part of the article deals with the design area definition and the determination of load cases for topology calculation. The second part describes the process of the topology optimization itself and the creation of the volume body based on the calculation results. Finally, the final control using an FEM (Finite Element Method) analysis and optimization of created Computer-Aided Design (CAD) data is shown. Part of the article is also a review of partial iterations and resulting versions of the designed part. Symmetry was used to define boundary conditions, which led to computing time savings, as well as during the CAD model creation, where non-parametric surfaces were mirrored to shorten the design time.Web of Science125art. no. 75

Comprehensive view on racing car upright design and manufacturing

This paper deals with the design of an upright using a topological optimization. This type of optimization is a relatively young and rapidly evolving area of computational mechanics that seeks to make multiple material savings that cannot be achieved by conventional methods. The optimized upright was utilized in a fully functional prototype of the student formula within the Formula Student competition. The main objective of the optimization was to meet the requirements of the physical properties, weight, stiffness, and strength of the upright. The initial model of the upright was iteratively optimized using topological optimization and a finite element static analysis to obtain the final model. Using the finite element analysis, its behavior in operation within individual load cases was predicted. Symmetry was used to mirror the finished model to obtain the opposite upright of the other side of the car. Finally, the topologically optimized upright was compared with an upright made by conventional methods.Web of Science126art. no. 102

Prediction of model distortion by FEM in 3D printing via the selective laser melting of stainless steel AISI 316L

This paper deals with an experimental analysis of stress prediction and simulation prior to 3D printing via the selective laser melting (SLM) method and the subsequent separation of a printed sample from a base plate in two software programs, ANSYS Addictive Suite and MSC Simufact Additive. Practical verification of the simulation was performed on a 3Dprinted topologically optimized part made of AISI 316L stainless steel. This paper presents a typical workflow for working with metallic 3D printing technology and the state-of-the-art knowledge in the field of stress analysis and simulation of printed components. The paper emphasizes the role of simulation software for additive production and reflects on their weaknesses and strengths as well, with regard to their use not only in science and research but also in practice.Web of Science114art. no. 165

A review of vat photopolymerization technology: Materials, applications, challenges, and future trends of 3D printing

Additive manufacturing (3D printing) has significantly changed the prototyping process in terms of technology, construction, materials, and their multiphysical properties. Among the most popular 3D printing techniques is vat photopolymerization, in which ultraviolet (UV) light is deployed to form chains between molecules of liquid light-curable resin, crosslink them, and as a result, solidify the resin. In this manuscript, three photopolymerization technologies, namely, stereolithography (SLA), digital light processing (DLP), and continuous digital light processing (CDLP), are reviewed. Additionally, the after-cured mechanical properties of light-curable resin materials are listed, along with a number of case studies showing their applications in practice. The manuscript aims at providing an overview and future trend of the photopolymerization technology to inspire the readers to engage in further research in this field, especially regarding developing new materials and mathematical models for microrods and bionic structures.Web of Science134art. no. 59

Experimental verification of process parameters influencing the mechanical properties of M300 in the SLM process

The main goal of this paper is to present the results of experimental verification of process parameters affecting mechanical properties of M300 material in the Selective Laser Melting (SLM) process. To obtain the values of mechanical properties, the samples were subjected to tensile testing, where the force, and elongation values were obtained. Therefore, from these values, the values of yield strength, elastic modulus, force and stress at the interface, tensile strength were then derived. It was also possible to construct tensile test F - ∆L: force-elongation diagrams for all specimens, and to construct an R – Ɛ: stress strain dependency diagram using the calculation of the original area and original length of the specimen. As a result of this work, mechanical property diagram was produced as a function of the process parameters used, showing which parameters most appropriate for the desired properties on the Renishaw AM400 printer.Web of Science20236560655