Marek Młyńczak

Logistic Support Model for the Sorting Process of Selectively Collected Municipal Waste

An intensive growth of population, progressing processes of social and economic development and increasing urbanisation of fast-developing countries considerably contribute to the increase in the amount of the waste produced. This necessitates reasonable decisions to be made within waste man-agement in urban areas. Therefore, a clear increase in the interest in matters as-sociated with the selection of relevant strategies for planning the waste man-agement process has been noticeable in recent years. One of the global aims is to develop appropriate waste recycling strategies. Solving problems associated with the selection of an appropriate strategy for waste management, planning collection processes, sorting and recovery, designing infrastructures for waste treatment and monitoring of such processes often requires that a model-based approach should be applied. The main objective of this paper is to present a simulation model that aids the decision-making process as regards the planning of sorting processes for the selectively collected municipal waste at the Recy-cling Centre in WPO ALBA S.A.

Analytical Identification of Parameters Influencing Measurement Quality Using Flat Brake Tester

Vehicle braking capability may be tested in two options: on-road or in workshop conditions. On-road testing is the most credible but difficult to repeat the same conditions and hard to measure and collect braking data. On the other hand testers testing in workshop conditions provide comparable conditions but are less similar to real braking process on the road. Anyway periodical testing of braking systems is performed in workshops equipped with special testers based on flat plates or rolling drums. Both methods involve errors and it is difficult to decide about superiority of one of it. The basic problem is observed in contact area between at tire and surface of the tester. Drum testers are easier to operate and more popular as require less space but the contact area is not so adequate comparing to flat testers. Paper describes analytical approach to measurement errors identification. Methodology of brake testing on flat testers and measurement system is shown. There are discussed measurement errors on flat testers related to the positioning of the vehicle during braking as well as the type and parameters of the test modes. Another paper discusses simulation of the brake process on flat plate tester.

Simulation and Experimental Analysis of Quality Control of Vehicle Brake Systems Using Flat Plate Tester

Paper describes simulation analysis of errors that arise in the control process of brake systems for vehicles using flat testers. Technical state of brake systems and their performance in operation are important aspects of safety. Method of numerical simulation of dynamic systems is described concerning vehicle braking capability. It is proposed dynamic model of the tire on the flat plate brake tester. Simulation model takes into account all factors influencing measurement error resulting from testing method. Methodology of brake testing on flat testers and measurement system is analyzed. There are discussed measurement errors observed on flat testers related to the dynamic properties of the tire, load on the wheel, mass of tester plate as well as speed and braking time and force applied by a driver. Calculations are illustrated with graphs. Square correlation coefficient of assumed functions is not less than 0.95.