Víctor Roda-Casanova

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• PhD
• Professor (Associate) at Jaume I University

The face load factor is a common coefficient used in gear design standards that takes into account the uneven distribution of load across the face width of the gears caused by the mesh misalignment. In this paper, a finite element model that includes the gears and the corresponding shafts is proposed. The results obtained from the application of fi...

Export Date: 31 January 2014, Source: Scopus, Art. No.: 071007, CODEN: JMDEE, doi: 10.1115/1.4006831, Language of Original Document: English, Correspondence Address: Gonzalez-Perez, I.; Department of Mechanical Engineering, Universidad Politecnica de Cartagena (UPCT), Dr. Fleming s/n, Cartagena 30202, Spain; email: ignacio.gonzalez@upct.es, Referen...

One of the main problems when standard spur gears are in mesh is the appearance of edge contact on the gear tooth surfaces caused by misalignments. Those misalignments are caused partially by deflections of gear supporting shafts. As a result of an edge contact, a non-favorable condition of the bearing contact occurs, yielding high level of contact...

This article describes a new numerical approach to determine the temperature field of polymer spur gears during their operation. The approach is based on an uncoupled procedure in which a mechanical problem is solved to determine the amount of heat that is generated by friction during the meshing of the gears, and then this heat is considered as a...

This article describes a new multiblock procedure for automated generation of two-dimensional quadrilateral meshes of gear drives. The typical steps of the multiblock schemes have been investigated in depth to obtain a fast and simple way to mesh planar sections of gear teeth, allowing local mesh refinement and minimizing the appearance of distorte...

Unlike conventional involute spur and helical gears, asymmetric gears are distinguished by having different geometries for the drive and coast sides of their teeth. At a macrogeometric level, these differences include different pressure angles and fillet radii for each side of the gear teeth. At a microgeometric level, the two sides of the gear tee...

Stroke often causes neuromotor disabilities, impacting index finger function in daily activities. Due to the role of repetitive, even passive, finger movements in neuromuscular re-education and spasticity control, this study aims to design a rehabilitation exoskeleton based on the pulp pinch movement. The exoskeleton uses an underactuated RML topol...

Background: File fracture during root canal treatment in endodontics is a major concern for clinicians. The strength of the file is strongly dependent on its geometry, material, and working conditions; finite element simulations are used to understand these failure mechanisms. One limitation of the models used for these simulations is the approxima...

This paper focuses on the vibration serviceability assessment and numerical modelling of an existing steel truss footbridge located in the outskirts of Castelló n, Spain. The footbridge is rather slender and composed by a main span and two access ramps supported on three 4-arm piers of different heights. Due to the connection between the main span...

Automation of wrist rotations in upper limb prostheses allows simplification of the human–machine interface, reducing the user’s mental load and avoiding compensatory movements. This study explored the possibility of predicting wrist rotations in pick-and-place tasks based on kinematic information from the other arm joints. To do this, the position...

Heat convection is an important phenomenon in the process of cooling polymer spur gears running in dry conditions, which ultimately affects the strength of the gears. In order to gain some insight into this phenomenon, a numerical heat convection model for polymer spur gears is proposed in this work, which is based on a detailed CFD simulation of t...

A complete approach for the search of top-quality six-bar linkages based on four-bar linkages generating coupler curves with circular regions has been developed. The approach includes a robust algorithm to search for high-accuracy circular regions in coupler curves and a fitness function able to evaluate the quality of the resulting linkage. The ap...

The mechanical properties of polymer gear transmissions are dependent on the operating temperature. Therefore, the prediction of the temperature of polymer gears is an important step during the design process. In this regard, analytical methods provide simple equations to predict the bulk temperature, but its applicability is limited by the underly...

Among the competences to be achieved by students in the area of Mechanical Engineering are those related to the analysis and design of mechanisms. For which it is essential to understand the behaviour of basic mechanisms. Beyond the mathematical relationships that determine the functionality of mechanisms, students need to have a qualitative unders...

In this article, the effects of cross-section and pitch on the mechanical response of NiTi endodontic files is studied by means of finite element analyses. The study was conducted over a set of eight endodontic rotary files, whose geometry was obtained from combinations of two cross-sections (square and triangular) and four pitches. Each file was s...

This article describes a numerical procedure for estimating the fatigue life of NiTi endodontic rotary files. An enhanced finite element model reproducing the interaction of the endodontic file rotating inside the root canal was developed, which includes important phenomena that allowed increasing the degree of realism of the simulation. A method b...

This article describes an investigation that has been conducted to assess the effects of the contact pattern design on the mechanical and thermal behaviors of plastic-steel helical gear drives. The maximum contact pressure, frictional power loss, transmission error function and operating temperature are determined for different designs of the pinio...

Objective The aim of this study was to analyze the stress distribution of endodontic rotatory files during bending and torsional conditions regarding the cross-section design and pitch. Materials and Methods Finite elements analysis (FEA) of NiTi rotatory files were made using a 3-dimensional modeling program. Squared and triangular cross section d...

Introduction: The finite element method has been extensively used to analyze the mechanical behavior of endodontic rotary files under bending and torsional conditions. This methodology requires elevated computer-aided design skills to reproduce the geometry of the endodontic file, and also mathematical knowledge to perform the finite element analys...

Aim: To compare the distribution of stress across experimentally designed endodontic rotary files with different cross-sections, pitch, and helix angles under conditions of bending and torsion force. Materials and Methods: Three-dimensional simulations were created using Matlab software for finite element analysis of eight endodontic rotary files...

This article describes a new procedure for automated generation of two-dimensional locally refined quadrilateral meshes of gear drives. In this new procedure, a base mesh is generated using a multiblock meshing procedure. Then, selected elements of the base mesh are subdivided to obtain a refined mesh in certain parts of the gear teeth. The propos...

Shaft deflection is a common phenomenon in machine design that has an important influence on the behavior of many transmission elements supported by the shafts, like gears, pulleys, sprockets, etc. This deflection can be estimated efficiently by using 1D models associated to beam theories, but machine shafts are usually stepped shafts and it has be...

Semi-analytical methods are commonly used to solve contact problems. These methods require the discretization of the domain into a mesh of pressure elements. In general, it can be said that their accuracy increases as the pressure element mesh is refined. However, the refinement of the pressure element mesh also implies an increase in their computa...

Semi-analytical methods are a common way of solving non-hertzian contact problems when designing mechanical components. These methods require of the discretization of the domain into a set of pressure elements and their accuracy and computational cost are related to the number of elements in which the domain is discretized. But, while the accuracy...

Plastic gears bring some interesting advantages compared to metal gears. However, they also have some drawbacks, many of them related to the dependency of their mechanical properties with the temperature. Among other reasons, the friction between the gear teeth causes a heat flux that heats the gears and produces temperature variations within the g...

The misalignment of the gears is one of the main causes of premature failure in gear transmissions. This misalignment can be caused by different phenomena where the deformation of the elastic elements of the transmission usually has a major importance. In this paper, a pinion and rack transmission is used to investigate the misalignment of the pini...

The pass rates of the subjects in the second year of the Degrees in Mechanical Engineering, Electrical Engineering and Industrial Technologies Engineering at Universitat Jaume I related to Mechanics and Elasticity are below the average rate of of the course. After an analysis of the reasons for this poor performance during the past 4 courses it was...

The tooth contact analysis (TCA) is an important resource for the design of gear drives. This widely used analysis provides the contact pattern, contact path and the function of transmission errors that are directly related to the performance of the gear set. In this work, a new geometric approach for the TCA is proposed. This approach is general,...

Gear misalignments originate unwanted uneven load distributions that increase contact pressures and the bending stresses, reducing the service life of gear drives. Therefore, it is very important to take into account the misalignments in the determination of contact pressures when designing a gear transmission. Some of these misalignments are relat...

Conference code: 91020, Export Date: 31 January 2014, Source: Scopus, doi: 10.1115/DETC2011-47895, Language of Original Document: English, Correspondence Address: Roda-Casanova, V.; Department of Mechanical Engineering, Jaume i University, Castellon, Spain, References: Litvin, F.L., Lian, Q., Kapelevich, A.L., Asymmetric modified spur gear drives:...