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J.A. Cabrera

Bio: J.A. Cabrera is an academic researcher from University of Málaga. The author has contributed to research in topics: Slip (vehicle dynamics) & Evolutionary algorithm. The author has an hindex of 14, co-authored 30 publications receiving 803 citations.

Papers
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Journal ArticleDOI
TL;DR: The main advantages of the solution methods of optimal synthesis of planar mechanisms are its simplicity of implementation and its fast convergence to optimal solution, with no need of deep knowledge of the searching space.

311 citations

Journal ArticleDOI
TL;DR: The error between the desired and the target coupler curve in a four- bar mechanism and in a six-bar mechanism is obtained, showing that the found solutions by the MUMSA algorithm were accurate and valid for all cases.

95 citations

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TL;DR: A searching procedure is developed, which applies genetic algorithms based on evolutionary techniques that has proved to solve synthesis problems of planar mechanisms and has been used for testing a hand robot mechanism, showing that the solutions are accurate and valid for all cases.

67 citations

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TL;DR: The development of a fuzzy control method for a tire antilock system in vehicles while braking, integrated in a tire test bench, thereby allowing us to imitate the functioning and to understand the behavior of these systems in a reliable way.
Abstract: The use of fuzzy control strategies has recently gained enormous acknowledgement for the control of nonlinear and time-variant systems. This article describes the development of a fuzzy control method for a tire antilock system in vehicles while braking, integrated in a tire test bench, thereby allowing us to imitate the functioning and to understand the behavior of these systems in a reliable way. One of the inconveniences found in the development of these systems has been the difficulty of adjustment to the real conditions of a functioning vehicle. The main advantage obtained when using the tire test bench is the possibility of being able to reproduce the conditions established as fundamental to the operation of the antilock brake system (ABS) in a reliable and repetitive way, and to adjust these systems until optimal performance is obtained. The fuzzy control system has been developed and tested in the tire test bench to be able to refine its fundamental parameters, obtaining adequate results in all the studied conditions. The ease of the bench for the development and verification of new control systems for ABS has been demonstrated.

66 citations

Journal ArticleDOI
TL;DR: A new brake system architecture based on the use of proportional servovalves allows for faster and more precise control of the pressure, preventing the wheels from locking and reducing braking distances and a new control block has been developed to determine the optimum pressure in the braking circuit.
Abstract: The braking system is the main active safety equipment of vehicles. This paper presents a new brake system architecture based on the use of proportional servovalves. The use of servovalves allows for faster and more precise control of the pressure, preventing the wheels from locking and reducing braking distances. A new control block has been developed to determine the optimum pressure in the braking circuit. The new controller is based on the use of fuzzy logic techniques. A Kalman-filter-based estimation algorithm allows for obtaining the adhesion between the wheel and road surface and vehicle speed. These parameters are used in a fuzzy block to detect the road type. Using the road type, an artificial neural network gives an estimation of the slip that produces higher adhesion, and a final block, which is also based on fuzzy logic, determines the optimal pressure in the braking circuit. The performance of the new brake architecture and controller is evaluated by simulating driving on different road surfaces and with real tests on dry and wet asphalt.

66 citations


Cited by
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Journal ArticleDOI
TL;DR: The journey of Differential Evolution is shown through its basic aspects like population generation, mutation schemes, crossover schemes, variation in parameters and hybridized variants along with various successful applications of DE.

316 citations

Journal ArticleDOI
21 Jul 2013
TL;DR: An interactive design system that allows non-expert users to create animated mechanical characters by sketching motion curves indicating how different parts of the character should move, and significant parts of it extend directly to non-planar mechanisms, allowing for characters with compelling 3D motions.
Abstract: We present an interactive design system that allows non-expert users to create animated mechanical characters. Given an articulated character as input, the user iteratively creates an animation by sketching motion curves indicating how different parts of the character should move. For each motion curve, our framework creates an optimized mechanism that reproduces it as closely as possible. The resulting mechanisms are attached to the character and then connected to each other using gear trains, which are created in a semi-automated fashion. The mechanical assemblies generated with our system can be driven with a single input driver, such as a hand-operated crank or an electric motor, and they can be fabricated using rapid prototyping devices. We demonstrate the versatility of our approach by designing a wide range of mechanical characters, several of which we manufactured using 3D printing. While our pipeline is designed for characters driven by planar mechanisms, significant parts of it extend directly to non-planar mechanisms, allowing us to create characters with compelling 3D motions.

254 citations

Journal ArticleDOI
TL;DR: A review of recent developments and trends in tire/road friction modeling is presented, with attempts to provide a broad perspective of the initiatives and multidisciplinary techniques for related research.
Abstract: A proper tire friction model is essential to model overall vehicle dynamics for simulation, analysis, or control purposes since a ground vehicle's motion is primarily determined by the friction forces transferred from roads via tires. Motivated by the developments of high-performance antilock brake systems (ABSs), traction control, and steering systems, significant research efforts had been put into tire/road friction modeling during the past 40 years. In this paper, a review of recent developments and trends in this area is presented, with attempts to provide a broad perspective of the initiatives and multidisciplinary techniques for related research. Different longitudinal, lateral, and integrated tire/road friction models are examined. The associated friction-situation monitoring and control synthesis are discussed with a special emphasis on ABS design

220 citations

Journal ArticleDOI
TL;DR: Three different evolutionary algorithms such as (GA), (PSO) and (DE) have been applied for synthesis of a four-bar mechanism minimising the error between desired and obtained coupler curve and performance of DE is found to be the best.

161 citations

Journal ArticleDOI
TL;DR: This work presents a combined genetic algorithm–fuzzy logic method to solve the problem of path generation in mechanism synthesis and proved to be more efficient in finding the optimal mechanism.

154 citations