Zbigniew Budniak

Intelligent Automated Design of Machine Components Using Antipatterns

The article presents a methodology for the analysis of similarities between structural features of designed machine elements and the corresponding antipatterns. This methodology allows normalization of selected design solutions’ characteristic features. The defined antipatterns are generic definitions of the possible incorrect design solutions. The article also presents antipatterns’ attributes, as well as classification based on the root causes of errors in designed solutions. Examples of a step shaft have been used to illustrate the methodology of designed solution and its antipattern correspondence evaluation. Root causes of a design error, its importance, and similarities shared with other design errors have been analyzed for each of the presented antipatterns. Correctly designed shafts - not having the characteristics of an antipattern - have also been presented.

A Method for Intelligent Quality Assessment of a Gearbox Using Antipatterns and Convolutional Neural Networks

Taking gearbox as a reference structure, authors apply a method for grading the quality of mechanical structures using a convolutional neural network trained with antipatterns found in gearbox constructions. Antipatterns are used as a quality reference embodied in a neural network, which is used for classifying tested structures to match the antipatterns taught to it.

Analysis of the forming process of conical-like helical surfaces with roller tools

Abstract The article presents a methodology of an analysis and modeling of technological systems and the grinding process of conical-like helical surfaces with the use of modern CAD/CAE systems and calculations in the Matlab system. The methodology developed allows one to carry out simulation tests for the accuracy of the grinding process of helical surfaces taking into consideration the deviations of the location and shape of the system’s elements, axial and radial striking the spindle of the workpiece machined and the grinding wheel as well as the tool’s geometrical features.

MODEL OF 5R SPATIAL LINKAGE IN THE GEOMETRY OF TORI

Abstract The present study covers the problem of a kinematic analysis of a spatial 5R single DOF linkage. This mechanism was constructed by combining two 4R universal mechanisms presented in tori geometry (Bil, 2012). The problem can be presented as the effect of an intersection of two tori in such a manner that the circles that form these tori do not coincide (Bil, 2010; 2011; 2012; 2012). As a result of this, a 5R model was obtained of a five-bar mechanism. It was demonstrated that there are 16 cases of the intersection of two universal tori with constant linear dimensions and that they differ with the angles of the mutual positions of rotation axes. A particular case of the five-bar mechanism presented herein is the well-known Goldberg mechanism (Goldberg, 1943), which was initially formed out of a particular case combination of two Bennett mechanisms (Bennett, 1903; Baker, 1979).

Optimization of the Movement Trajectory of Mobile Crane Working Elements

The article presents simulation testing of the optimization of the cargo trajectory in the mobile crane handling system, whose purpose was to determine the function that minimizes the total length of the path, and thus an increase of efficiency, with stability conditions being maintained. In order to perform a movement analysis and an optimization of the handling assignment, a parametric crane system model built and a simulation model developed in the integrated CAD/CAE environment were used.

Comparison of Numerical Models Used for Automated Analysis of Mechanical Structures

Authors present the comparison of properties observed in numerical models, that were used to classify features of mechanical constructions. We use these models to detect similarities between mechanical designs and compare them on how well they quantify the description of the mechanical elements, and how they deal with arising challenges: multi-dimensionality of feature values, multiple classes of relations, data incompleteness and variability of format. The key conclusion here, is the ability of modern numerical models (i.e. ConvNet, CapsNet) to process information describing mechanical constructions, while including meaningful structural data in the calculations. Application of these models can provide direct assistance in the mechanical design process.

Stability Assessment as a Criterion of Stabilization of the Movement Trajectory of Mobile Crane Working Elements

Abstract The article presents a stability assessment method of the mobile crane handling system based on the safety indicator values that were accepted as the trajectory optimization criterion. With the use of the mathematical model built and the model built in the integrated CAD/CAE environment, analyses were conducted of the displacements of the mass centre of the crane system, reactions of the outrigger system, stabilizing and overturning torques that act on the crane as well as the safety indicator values for the given movement trajectories of the crane working elements.

Computer Aided Analysis of the Mobile Crane Handling System Using Computational Intelligence Methods

This article describes computer aided analysis using computational intelligence methods for analysis and simulation research of a crane system during sequential movements. A parametric solid model has been specified, designed with a CAD/CAE environment, which allows to evaluate its stability for selected configurations and conditions of operation. Neural-network-supported analysis of varying contact forces exerted by the outriggers onto the ground, stabilizing and overturning torques, mass centre during handling allowed to specify trajectories ensuring stability of the crane. The results of the simulation research have been presented as changes of stability conditions depending on: angular position of the column with its telescopic arms and booms, the position of the telescopic arms themselves, the mass of individual components of the load system, as well as the load value applied onto it.

Interactive Control Systems for Mobile Cranes

The paper presents an invented interactive control system for mobile lifting devices, particularly for loader cranes. The proposed innovative system is comprised of modules, output signals from which are sequentially transformed into a commands sequence corresponding to the motion strategy, related to incremental changes of position or motions depending on the distance to the end position. In the system, the commands sequence related to the position of the operating element corresponds to the trajectory optimization strategy in accordance with the positioning time minimization criterion, total length of the path of motion minimization during handling, or maximization of the safety indicator. An innovative processing scheme, using several functional modules, for the interactive control system has been presented, covering also the use of anti-patterns of normalized commands and standardized strategies, and analysis of crane stability. The invented system solves the problem of effectively controlling lifting devices during tasks requiring increased efficiency, safety, speed and precision.

Modelling and Motion Analysis of Five-Bar 5R Mechanism

Abstract This article presents the use of the potential of the present-day CAD/CAE systems in modelling and a kinematic analysis of a spatial five-membered lever mechanism 5R. A simulation model was developed. On the grounds of the methodology developed, numerical analysis was conducted. The results of the analysis are presented in diagrams.