Jarosław Zubrzycki

Mathematical Model of the Hole Drilling Process and Typical Automated Process of Designing Hole Drilling Operations

The paper is devoted to the mathematical modelling and optimal control of hole drilling. Drilling feed is considered as control action while the cutting force is controlled variable. Transfer functions of the regulators were obtained, with the cutting force variance being used as quality criterion for the automatic control system. In the article has been presented also, questions connected with the structure of typical automated process projecting of the hole drilling operation. The block pattern of the typical process automated projecting was introduced. The processed algorithms of setting of the parameters of regulators according to a priori technological information and program protection were also introduced, to automate letting the process of the study of the automatic control system for the operation of the hole drilling.

Modelling And Systemic Analysis Of Models Of Dynamic Systems Of Shaft Machining

The specifics of modelling the dynamic system of turning as well as straight and plunge grinding of low rigidity shafts is presented in the paper. Methodology of developing models while machining shafts in elastic-deformable condition is shown. The specifics of processing of low rigidity elements is taken into account by introducing equations of constraint reflecting additional elastic strain in equation describing the control force effect. Systemic analysis of the developed models is performed and main hierarchical structure levels are given.

STRUCTURAL ANALYSIS OF ARTICULAR CARTILAGE OF THE HIP JOINT USING FINITE ELEMENT METHOD

The paper presents the results of a preliminary study on the structural analysis of the hip joint, taking into account changes in the mechanical properties of the articular cartilage of the joint. Studies have been made due to the need to determine the tension distribution occurring in the cartilage of the human hip. These distribution are the starting point for designing custom made human hip prosthesis. Basic anatomy, biomechanical analysis of the hip joint and articular cartilage are introduced. The mechanical analysis of the hip joint model is conducted. Final results of analysis are presented. Main conclusions of the study are: the capability of absorbing loads by articular cartilage of the hip joint is preliminary determined as decreasing with increasing degenerations of the cartilage and with age of a patient. Without further information on changes of cartilage’s mechanical parameters in time it is hard to determine the nature of relation between mentioned capability and these parameters.

Accuracy Control in the Machining of Low Rigidity Shafts

The study determines the most suitable pattern of alignment and fixing of low-rigidity shafts; it also presents factors that determine such choice. The part is fixed both by force closing and kinematic closing. A new method for machining low rigidity shafts is developed to control the elastic-deformable state of these shafts in a technological system and to produce parts with the required accuracy during turning. To implement this new developed method for low rigidity shafts, an apparatus is designed. The apparatus allows to increase the rigidity of shafts during machining by the application of axial tensile force to the workpiece. Rational prime costs of preparing technological alignment centers at the stage of production preparation are determined; knowing these costs, it is possible to select a suitable machining technology for low rigidity shafts, to produce a technology-oriented design, and to reduce the costs of machining these shafts.

Computer-Aided Design of Human Knee Implant

This paper presents the design process of human knee implant. The design has been used CT scans from the actual clinical trials. To make a 3D model from CT images Materialise Mimics software was used. On the basis of the resulting model, further work was carried out to obtain a STL model is necessary to carry out research numerical finite element method. This paper presents the results of numerical only one element of which is the medical polyethylene insert, which will act as a prosthetic meniscus.

Proposal of Multi Robotic Cells for Production Lines

The paper is focused on the determination of the number of robots for multi robotic cells that can be part of the line, respectively as an individual, for example sub-assemblies welding of car bodies. This paper describes general process steps of the methodology of design of multi robotic systems with a more detailed description of the determination of number of robots in the workplace. Some methodological steps are illustrated by specific examples.

Application of Artificial Neural Networks in Image Recognition

This paper presents aaplication of two-layer Kohonen networ for the grouping of machine elements to automatically recognition by the robots. This technology is very important for robotic assembly process of a large group of different parts.

Application of Two-Layer Kohonen Networ in Image Recognition

This paper presents aaplication of two-layer Kohonen networ for the grouping of machine elements to automatically recognition by the robots. This technology is very important for robotic assembly process of a large group of different parts.

Modelling Characteristics Turning Processing for Want of Management by an Elastic Deformed Condition

For an accepted physical model with allowance of cutting “on a trace” phenomena, the initial mathematical model for want of processing non-rigid shafts is considered. In this model the improper rigidities of an elastic system are taken into account. In particular, pliability of a technological system on coordinate X in relation to cutting forces component on Y coordinate. Considered the individual models of dynamic system of turning machines for want of small rigidity shafts processing with management on the channel of additional managing force effects, which with a sufficient degree of an exactitude can be used in engineering accounts.

Application of IT Methods for the Identification and Analysis of EEG Signals

This paper presents the possibility of using advanced IT tools for the identification and analysis of biological signals on the example of electroencephalographic tests. Identification and numerical analysis of EEG signals from a person suffering from epilepsy during and between seizures is presented.