Motor vehicle speed is one of the inputs used to develop models for predicting road traffic noise levels. In existing models, the vehicle speed used as input to estimate the noise level is not the current (measured) speed, but the vehicle speed determined based on the speed limit by road type or vehicle type. Therefore, the development of a device for measuring vehicle speed using radar that works on the principle of Doppler effect, which is presented in the paper. The advantage of this measuring device is the low price compared to similar devices, easy use and the possibility of easy processing of data obtained by measurement. The device allows measuring speed in all weather conditions in terms of temperature, precipitation and time of day. Then, in real time, it displays the speed and direction of movement of the vehicle on the screen of the mobile phone, and in the stationary laboratory, remote control, adjustment and adjustment of the software for measuring speed is enabled.
The paper presents a procedure for design of an appropriate noise protection system for an automobile scrapyard. The influenced object is a residential area that borders the scrapyard. The noise impact was estimated by measurements of noise levels in the residential area. Since the measurements revealed that the noise level is above the allowed limits in a wide part of the residential area, a noise map was assembled. The noise maps enabled determination of critical points, with the highest noise levels. Based on calculated noise levels in critical points, characteristics of sources of noise and the relevant noise regulations, a sound barrier was designed as a noise protection mean that will provide a sufficient noise protection of the plant.
Abstract:The paper presents the method of obtaining mathematical equations named "Analytical algorithm expressions" which enable simple creation of computer programs for simulation of the temperature field in the weld zone in electric resistance spot welding. Knowledge of these equations and the manner of their formulation make creation of program packages easier but they do not change anything with respect to the structure and scope of necessary input data which determine concrete initial and boundary conditions. In addition to providing algorithm description of the temperature field, the considered approach is applied for mathematical description of the field of any other physical value relevant for the welding process (specific current, electric potential, density, etc.). In this paper they are realized in temperature fields, as hierarchically superior to the fields of stress and current density, i.e. fields of physical properties of materials of the sheet and the electrode (superiority refers to the algorithm domain). Results of simulation for the non-stationary period of the welding process at two extreme discreet moments are presented at the end.
Modular strongrooms (MSR) consist of industrially made elements, which are assembled at the place of use. They are designed on individual customer's requests. The customer chooses the resistance grade according to EN 1143-1 standard and provides dimensions of the available space for requested product to be fit in. Configuration of MSR is realized by combining standard modules which are, for the selected resistance grade, repeated in each new project, and differ only by their number and dimensions. This paper presents product platform developed for automatic MSR configuration, based on parametric and variable design, which provides requested configuration of the product, eliminates possible errors in design process, provides requested product quality level, decreases design and manufacturing costs, shortens design time and provides faster response to customer's requests. The proposed concept is tested and confirmed on numerous examples of realized projects.
The article presents the methodology for industrial noise control in the case of the dedusting system of a foundry. The developed methodology starts from the fact that noise protection is possible at the source of noise itself, on the paths of sound waves, and at the place of reception. The model for noise prediction is the basis of the methodology for solving specific examples, which consists of two parts, the source model and the noise propagation model. The result of the model is a noise field, based on noise map creation time. The activities in the procedure of noise protection are defined on a concrete example, and their interdependence is determined. Designing a noise protection system involves taking into account several functional, technological, and other limitations. Based on the required noise reduction of 15 dB in the nearest residential unit, variant noise protection solutions have been formed. The selection of the final noise protection solution was based on the techno-economic analysis.
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