
Alejandro BustosNational University of Distance Education | UNED · Department of Mechanics
Alejandro Bustos
Doctor of Engineering
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36
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Publications (36)
Topology optimization has become a popular tool for designing optimal shapes while meeting specific objectives and restrictions. However, the resulting shape from the optimization process may not be easy to manufacture using typical methods like machining and may require interpretation and validation. Additionally, the final shape depends on chosen...
CAD-CAE software companies have introduced numerous tools aimed at facilitating topology optimization through Finite Element Simulation, thereby enhancing accessibility for designers via user-friendly interfaces. However, the imposition of intricate constraint conditions or additional restrictions during calculations may introduce instability into...
Topology optimization has become a very popular design tool when an optimum design with a concrete objective and subjected to several restrictions is searched. However, the resultant shape of the optimization process isn’t usually easy to manufacture with a typical manufacturing method as machining, being necessary an interpretation and validation...
CAD-CAE software companies have introduced numerous tools aimed at facilitating topology optimization through Finite Element Simulation, thereby enhancing accessibility for designers via user-friendly interfaces. However, the imposition of intricate constraint conditions or additional restrictions during calculations may introduce instability into...
This paper makes a historical review of rolling bearing systems, their origins, evolution and technological development, up to their current conception. The article is based on the first rolling solutions given to transport issues thousands of years ago, including the emergence of the wheel. Attention will also be paid to mechanical devices that so...
The failure of railway axles can lead to catastrophic accidents, with the human and economic consequences that this entails. The vibratory performance of a freight train bogie is studied in this work aiming to identify the defects induced in the wheelset. The defects are generated mechanically with four severity levels. The bogie is tested in a rol...
The advent of Industry 4.0 has revolutionised the way in which all aspects of a product or service are approached, and the railway sector is moving toward the adoption of this new paradigm. Maintenance in railways is traditionally based on a preventive approach that replaces parts at regular intervals or when a failure occurs. However, the 4.0 revo...
This paper explains a computational tool for the kinematic analysis of a complex mechanical system. This software, implemented in MATLAB, was designed to complement the teaching of undergraduate students in mechanical engineering in the field of mechanism design. The basic mechanism is an articulated system of links used in the leg of the biped rob...
A physical four-bar linkage prototype was synthesised in which one pivot revolute joint was linked to the engine assembly of a Formula Student Car. Thus, the mechanism frame became a flexible link. The mechanism has a large torque gain, as with a low torque at the input crank supplied by a servomotor steer by wire, and a high output torque is produ...
Compliant or pseudo-rigid mechanisms that can provide optimal motions, carry out particular tasks, and cope with mechanical vibrations represent a challenge for its dimensional synthesis and mechanical design. These mechanisms gain mobility owing to the relative displacement of a joint or flexible-member deflection. Thus, they perform movement, for...
In this article, the manuscript of Codex Madrid I, Leonardo da Vinci's workshop drawings collection, is reviewed and the main mechanisms that appear in the aforesaid codex are analysed. It begins with a short reference to Leonardo da Vinci works and, subsequently, Leonardo's manuscripts and Codex Madrid I, in particular, are placed in their histori...
Compliant or pseudo-rigid mechanisms that can provide optimal motions, carry out particular tasks, and cope with mechanical vibrations represent a challenge for its dimensional synthesis and mechanical design. These mechanisms gain mobility owing to the relative displacement of a joint or flexible-member deflection. Thus, they perform movement, for...
A physical four-bar linkage prototype was synthesised in which one pivot revolute joint was linked to the engine assembly of a Formula Student Car. Thus, the mechanism frame became a flexible link. The mechanism has a large torque gain, as with a low torque at the input crank supplied by a servomotor steer by wire, and a high output torque is produ...
Introducción: La utilización de tornillos cementados en la fijación interna de fracturas de húmero proximal con placas bloqueadas parece mejorar la estabilidad del implante y disminuir las complicaciones asociadas al fracaso de síntesis. Sin embargo, la combinación óptima de tornillos cementados se desconoce. El objetivo de este estudio fue analiza...
The hunting phenomenon is an intrinsic swaying motion appearing in railway vehicles due to the vehicle’s forward speed and the wheel–rail contact forces. Hunting motion consists of wheelset and other vehicle’s components oscillations that arise above a certain vehicle’s speed known as critical or hunting speed. These oscillations are of unstable na...
Resumen Este trabajo desarrolla un control no lineal basado en modelo de referencia (MRC) y Lyapunov. Este MRC puede acomodarse a las variaciones de las frecuencias naturales de un brazo robotizado flexible cuando cambia la carga que se transporta en su extremo. Se utiliza el método de matrices de transferencia para obtener las formas modales, las...
A good suspension system is mandatory for ensuring stability, comfort and safety in land vehicles; therefore, advanced semi and fully active suspension systems have been developed along with their associated management strategies to overcome the limitations of passive suspensions. This paper presents a suspension algorithm for land vehicles traveli...
In this paper, the manuscript of Codex Madrid I, Leonardo da Vinci’s workshop drawings collection, are reviewed and the main mechanisms that appear in the aforesaid codex are analysed. The works of Leonardo and the Codex Madrid I, in particular, are placed in their historical context. A compilation of the 100 main drawings of the manuscript is made...
The fourth industrial revolution is changing the way industries face their problems, including maintenance. The railway industry is moving to adopt this new industry model. The new trains are designed, manufactured, and maintained following an Industry 4.0 methodology, but most of the current trains in operation were not designed with this technolo...
High‐speed rail is a key player in people's mobility thanks to its speed and high safety standards. These high safety standards are supported by extensive maintenance (of both rolling stock and track) that applies the latest nondestructive and monitoring techniques. In that context, this work presents the enhanced graphical representation of state...
Chuck holders are widely used for jobs with high precision. A chuck holder consists of a nut with a tapered surface and a thin-slotted clamping sleeve typically made of hardened steel and named a collet. Chuck holders are, essentially, wedge mechanisms. In this paper, we investigated the reactions and strains due to the forces during the chip remov...
Featured Application: This paper describes the development of an automatic collet chuck holder prototype which was designed considering the proposed methodology and analytical models within novel systems in control of workpiece presence, control of workpiece position, control of clamping force and in its structure transmission. Results provide reli...
One of the most critical systems in the operation of a train is the wheelset. This mechanical element is composed of the wheels and the axle. The wheelset must transmit the weight and dynamic forces of the railway vehicle to the track, so it is under the action of high and repetitive loads. Hence, the failure of this element could result in a catas...
A proper maintenance of train basic systems is a key aspect in the comfort and safety of that train, especially in high-speed rail. One of the most critical systems in the operation of a train is the bogie, a very complex mechanical system made up of several elements that interact between them. Bogie vibrations are the result of multiple mechanical...
Fault detection is a crucial aspect to avoid catastrophic failures on mechanical systems, as well as to save money for companies. Currently, a number of non-destructing tests, signal processing analysis and artificial intelligence techniques are used for processing larger and larger amounts of maintenance data in all industry fields, either indepen...
An efficient maintenance is a key consideration in systems of railway transport, especially in high-speed trains, in order to avoid accidents with catastrophic consequences. In this sense, having a method that allows for the early detection of defects in critical elements, such as the bogie mechanical components, is a crucial for increasing the ava...
The Graphics Processor Unit (GPU) attends the computers problems related with phenomena presented in Applied Engineering, Scientific Areas and specifically, in the Railway industry.
So that specifically, we present the resolution process of a mechanical system through its implementation taking advantage of the GPU features. A technique that could b...
The aim of this work is to explain the advances made in the development of biped robot PASIBOT. The wish of add mimetic skills to the basic robot lead us include a pair of linear actuators in the hip of the robot. In order to determine the best trajectories that will define these mimetic skills, a mathematical model is developed and implemented in...