Papers by Keyword: Mechatronic System

Abstract: In the paper, the problem of negative resistance has been studied. Considered systems are limited to mechatronic discrete structures that contains mechanical part and piezoelectric actuator in form of stack, connected to external electric network that include the resistance elements which can have and receive negative values. The study have been done based on examples of branched structures, received as a result of solving the reverse task, and is aimed for parameters, limits and constrains evaluation. The paper extends possible applications of piezostack actuators and applied configurations that utilize negative resistance for vibration control.

Abstract: This paper is devoted to the elaboration and verification of the new methodology for the life time prediction of wear parts in the mechatronic systems. The methodology is based on the using of the 3D surface texture parameters instead of 2D roughness parameters for more precise prediction of the life time of machine parts.Experimental testing of proposed methodology for the wear parts of linear motion modules of mechatronic system was done using 3D profilometry, pin-on-disc tribological testing for determination dynamic friction coefficient, slidability and static friction coefficient measurements. The new approach for life time prediction is based on using following 3D texture parameters: Sa, Sq, Str, Rsm₁ and Rsm₂. It is established, that the amplitude and spatial parameters (Sa and Str (Rsm₁) accordingly) have a most significant influence on the static and dynamic friction coefficient as well as on the sliding properties. It can be assumed, that for wear parts and for improving sliding properties the surfaces with less Sa and bigger Rsm₁ are recommended.Within the Ti-based multi-layer PVD coatings the best prognosis for the life time was achieved for the samples with multi-layer Ti-TiN-Al PVD coating. Proposed methodology is acceptable for use in practice of engineering calculation, in design etc.

Abstract: Given the large variability of pathological gait and the high specificity of gait phenotypes, it is very difficult to design a gait rehabilitation system able to adapt to the functional requirements of every person with ambulation disabilities, in every stage of the complex process of gait rehabilitation. Another approach is that of ambiental gait rehabilitation, with focus on adaptability, not on adaptation, on synthetical training, not on analytical training, on integrative training, not on step by step training. Our focus is not on controlling the movement itself, but on controlling the environment that shapes human functionality and assuring the appropriate level of support, resistance and persuasion, with consequent stimulation of the explorative behavior and the active involvement of the person in gait training. A mechatronic system designed for such a therapeutical approach has specific functional requirements.

Abstract: This paper describes general approach for creation the effective kinetic energy recovery system in mobile machines using flywheels. It’s should be a mechatronic system. The system with accelerometer-gyroscope and proportional, integral and differential controller (PID-regulator) is proposed as example of automatic control.

Abstract: The article presents use of a linguistic fuzzy-logic control (LFLC) system for mechatronic system modelling and control. The presented applications were verified on real laboratory tasks in the Laboratory of Intelligent Systems at the University of Ostrava. The LFLC system was developed at the University of Ostrava, Institute for Research and Applications of Fuzzy Modeling. This technology enables users to describe the system behaviour and/or the control strategy as a set of fuzzy rules. Input and output variables scales are defined by contexts and their change allows using the same system description for systems with similar behaviour very easily.

Abstract: This paper proposes an analysis of spectral monitoring processes of the crop vegetation status. In terms of the extensive implementation of precision agriculture, the performant agricultural management must ensure the monitoring of crop vegetation. In this context, determination and interpretation of vegetation indices, based on spectral data, plays a very important role. The performed research revealed the characteristics of monitoring the status of vegetation in order to obtain the necessary information, ie structure, actions and performances required to achieve an efficient system of monitoring the state of vegetation resources and to obtain the application maps for a precision crop management.precision crop management. This complex system ensures data acquisition and processing, thematic and application maps realization and decision generating on obtaining large productions and quality, on optimizing the economic profits, achieving of an integrated environmental protection and increasing of the sustainability of agricultural systems.

Abstract: The paper presents application of the mechatronic concept for laboratory test to support a research activity. Laboratory test is taken into account as set of processes for which some number of environmental parameters must be controlled. This paper describes the laboratory stand for investigations of airflow phenomena, where modern data acquisition system is applied to control pressure, temperature and velocity of the air stream. To acquire and process a large number of data, the idea of virtual instruments is introduced to control system. Modern, high-level graphical language was used and the author’s program was developed. The presented solution of the laboratory stand allows increasing the accuracy of measurement, it is possible to observe all necessary parameters as rescaled to standard units and use this information in process steering. All technical solutions applied in the system assume flexibility for changes because of additional sensors, actuators and new signal processing and steering procedures.

Abstract: Designing specific technical equipment requires solving a number of problems that consider the theoretical structures of particular technical means. In the case of mechatronics equipment, one should take into consideration three groups of problems: designing mechanical components, designing actuators and designing a control program [1]. Moreover, it is important to properly organize the process for the purpose to obtain a coherent project linking the three above mentioned sub-systems of mechatronics equipment [2]. Only when three sub-systems are properly designed, the whole system can appropriately and effectively operate. One should mention that the design process could be analyzed not only from the perspective of the partition of the main system but also from the perspective of design, material and assembly features [1, 3].Taking into account constraints providing for the design process, the procedures of creating the Stewart platform were followed. This platform was devised as an actuator of a car simulator [4, 5, 6, 7]. The process of designing was divided into the before introduced phases. First, the system of actuators was elaborated referring to information about the velocity and acceleration of a real car. Second, the control system was elaborated. The system was matched to the mechanical system of actuators. At the third stage, the control program was elaborated and tuned.All presented stages of the design process were computer aided so that the process of designing was conducted in virtual reality. It results in shortening the durability of the designing phase and in decreasing costs. This preparatory phase, including the realization phase, allowed preparing the real car simulator.

Abstract: Piezoelectric actuators are more and more common in many different technical and precision industries. Mechatronic systems which combine them with mechanical models and steering recently are used in plenty practical applications. In this paper, discrete mechatronic systems have been compared relating to known passive vibration isolation method and active that has been additionally introduced to considered systems. Requirements for the systems have been given in form of poles and zeros. Basing on amplitude response functions and dynamical flexibilities, damping performance in both cases has been investigated.

Abstract: The article examines the diagnostics of mechatronic systems and the possibilities of monitoring their facilities. The paper describes the stages of vibrodiagnostic research on the mechatronic system and refers to the measures for taking control that includes transducers, boosters, blocks of supply, programs, etc. The work employs a methodology for performing the analyses and vibrodiagnostic measurements of the mechanical-dynamic elements of mechatronic systems.