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1

Improves the Brake Working of the Rescue Winch to Control the Stop Brake Process

Duong Truong Giang, Nguyen Van Thinh

Advances in Science and Technology. Research Journal

|

2024

|

Vol. 18, no 1

255--267

EN

High-altitude rescue is an issue that always receives great attention. Using rescue winches on the outside of structures is a popular solution. During the rescue process, when the brakes stop, it will affect the human body, causing discomfort, especially when the rescue subjects include the elderly and children. The purpose of the research is to find a reasonable brake structure solution and parameters to improve performance, allowing for increased speed while still ensuring smooth acceleration when braking and controlling shock. This article develops calculation formulas describing the braking process and develops a method for selecting design parameters to control the braking process including spring deformation, spring stiffness, braking time, etc. The study uses the orthogonal matrix, analyzing the influence of parameters on the response function, and spring stiffness. Applying numerical testing to the design to increase the speed by 300%, the result is that the acceleration when braking is reduced by 67.75% compared to the previous study, and the shock in the range is smaller than the allowable value.

2

Ustalenie rzeczywistej prędkości tramwaju na podstawie wartości zarejestrowanych przez rejestrator ATM

Dąbkowski Paweł Grzegorz, Dylewski Sławomir

Paragraf na Drodze

|

2023

|

Nr 2

65--79

PL

Celem artykułu jest przedstawienie różnic pomiędzy prędkościami tramwaju zapisanymi w rejestratorze pojazdu a zmierzonymi urządzeniem pomiarowym i wprowadzenia propozycji zastosowania współczynnika korekcyjnego w celu ustalenia rzeczywistej prędkości tramwaju. W czasie eksperymentu realizowanego do jednej z opiniowanych spraw stwierdzono różnice pomiędzy wartościami prędkości zapisanymi w rejestratorze ATM i zmierzonymi urządzeniem VBOX Sport. Zauważono również, że już w rejestratorze zapisane są cztery prędkości, których wartości nie są takie same. W artykule przedstawiono źródła tych prędkości i obliczono współczynnik, który posłużył do odtworzenia rzeczywistych prędkości i przyspieszeń zarejestrowanych w czasie rzeczywistego zdarzenia.

EN

The aim of the article is to present the differences between the tram speeds recorded in the recorder and those measured with a measuring device, and to propose the use of a correlation coefficient to determine the real speed. During the experiment, performed for an expert witness opinion, differences were found between the speed values recorded in the ATM recorder and those measured with the VBOX Sport device. It was also noticed that four speeds of different values had already been recorded in the recorder. The sources of these speeds are presented and the correlation coefficient between the measured and recorded values, which was used to reproduce the actual speeds and accelerations recorded during the real event, is calculated.

3

Capabilities of Thomson parabola spectrometer in various laser-plasma- and laser-fusion-related experiments

Tchórz Przemysław, Szymański Maciej, Rosiński Marcin, Chodukowski Tomasz, Borodziuk Stefan

Nukleonika

|

2023

|

Vol. 68, No. 1

29--36

EN

The Thomson parabola spectrometer (TPS) [1] is a well-known, universal diagnostic tool that is widely used in laser plasma experiments to measure the parameters of accelerated ions. In contrast to other popular ion diagnostics, such as semiconductor detectors or ion collectors, the TPS is not greatly affected by electromagnetic pulses generated during high-power laser interaction with matter and can be tuned to acquire data in various energy ranges of accelerated ions, depending on the goal of the experiment. Despite the many advantages of this diagnostic device, processing the collected data is a diffi cult task and requires a lot of caution during interpretation of gathered results. In this work, we introduce the basic principles of operation and data analysis based on the numerical tool created specifi cally for the TPS designed at the Institute of Plasma Physics and Laser Microfusion, present a range of data obtained during various recent experiments in which our TPS was used, and highlight the diffi culties in data analysis depending on the purpose of the experiment and the experimental setup.

4

Analysis of an accelerating model of motor vehicle with the uncontrolled steering wheel

Zalewski Jarosław

Journal of KONBiN

|

2023

|

Vol. 53, iss. 1

137--146

EN

In this paper a continuation of the previous research has been presented. A simulation of a vehicle’s acceleration in various road conditions but without a driver’s control has been taken into account. The main aim of this paper was to answer the question whether the random road conditions could affect the vehicle while accelerating while a driver cannot control the direction of its motion. The three various maximum amplitudes of the irregularities for both the dry and the icy road surface were used. Almost different road profiles were also adopted for the analyzed maneuver, which defines a specific coefficient. Apart from no control of the vehicle the initial speed was set to 5 km/h and after 1 s the vehicle started to accelerate. The time of reaching the full throttle (100%) was only 0.25 s which provided a rapid acceleration. The simulation time was 10 s.

PL

W artykule przedstawiono kontynuację wcześniejszych badań. Uwzględniono symulację przyspieszenia pojazdu w różnych warunkach drogowych, ale bez kontroli pojazdu przez kierowcę. Głównym celem pracy była odpowiedź na pytanie, czy losowe warunki drogowe mogą oddziaływać na pojazd podczas przyspieszania podczas gdy kierowca nie może kontrolować kierunku jego ruchu. Użyto trzech różnych maksymalnych amplitud nierówności dla nawierzchni suchej i oblodzonej. Dla analizowanego manewru uwzględniono również prawie różne profile nawierzchni, co sprecyzowano przy użyciu określonego współczynnika. Oprócz braku kierowania pojazdem prędkość początkową ustawiono na 5 km/h i po 1 s pojazd zaczął przyspieszać. Czas dojścia do pełnego otwarcia przepustnicy (100%) wynosił zaledwie 0,25 s, co zapewniało gwałtowne przyspieszenie. Czas symulacji wyniósł 10 s.

5

Analysis of energy efficiency and dynamics during car acceleration

Graba Mariusz, Bieniek Andrzej, Prażnowski Krzysztof, Hennek Krystian, Mamala Jarosław, Burdzik Rafał, Śmieja Michał

Eksploatacja i Niezawodność

|

2023

|

Vol. 25, no. 1

art. no. 17

EN

In this work, the authors focused on analyzing the energy efficiency and dynamics during car acceleration, featuring investigation of acceleration dynamics under various acceleration intensities. The tests were performed in the speed range between 45 km/h and 120 km/h, at a constant gear ratio. This enabled obtaining variable dynamic parameters of the acceleration process, ranging from about 0.1 to 1.4 m/s2, and recording variation in fuel consumption from 6.28 to 27.03 dm3/100km. The study focused on determining the relation between fuel consumption, energy efficiency and vehicle acceleration depending on the available drivetrain power. The relation between fuel consumption and vehicle acceleration was described by using the dynamic index. The proposed dynamic index takes into account the energy (from burned fuel) and vehicle acceleration intensity to obtain an objective metric for characterizing the acceleration process. The aforementioned index takes the form of the passenger car movement energy quality index and can be related to widely known physical properties, thus ensuring its universality. The index expresses the energy expenditure within the time needed to accelerate a vehicle weighing 1kg by a 1m distance. As opposed to other criteria that are applied to the assessment of passenger cars dynamics, the index shows a high determination coefficient R2 in excess of 0.99, and can be used as a universal metric to test other vehicle types.

6

Machine Tool Table Dynamics Tests when Starting and Braking during an Operation Test

Leleń Michał, Sałamacha Daria

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no 1

64--74

EN

The main objective of the presented research is to analyze the dynamics of table motion of a CNC FV580A 3-axis milling machine during machining with fixed technological cutting parameters. The research includes the measurement of velocity, acceleration and deceleration, as well as distance and time parameters related to the movement of the machine's table during starting and braking during work tests. The results of the measurements were recorded using a Phantom v1610 high-speed video camera equipped with a Nikon ED AF NIKKOR 80:200 mm 1:2.8D lens, dedicated to the analysis of high-speed phenomena. The analysis presented in the publication includes a comparison of the results of the motion parameters obtained as a function of the feed motion speed vf. The results of the obtained tests and their analysis are discussed and presented in graphs and tables.

7

Analysis of micro-electromechanical inertial measurement units for unmanned aerial vehicle applications

Mammadov Aftandil

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2022

|

z. 117

129--138

EN

Typically, an inertial navigation system (INS) is used to determine the position, speed, and orientation of an object moving relative to the earth's surface. The navigation information (position, speed and orientation) of an unmanned aerial vehicle (UAV) is needed to control its flight. Since the resistance of INS to interferences is very high, it is possible to ensure reliable flights in conditions of high-intensity noise. This article explores the principles of constructing inertial measurement units (IMU) that are part of the INS and indicates perspective directions for their development. Micro-electromechanical inertial measurement units were studied in this work, and functional and principal electrical circuits for connecting units of inertial measurements to the microcontroller were developed. The results of practical measurements of units without calibration and after calibration were obtained using the created laboratory device. Based on the obtained results, the necessity of sensor calibration was revealed, and accuracy was improved by performing calibration with the Kalman filter algorithm. The Kalman filter is the heart of the navigation system. In a low-cost system, IMU errors like bias, scale factor error and random walk noise dominate the INS error growth.

8

Distributed accelerated projection - based consensus decomposition

Maj Wiktor

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

|

2022

|

Vol. 26, No 2

32--38

EN

With the development of machine learning and Big Data, the concepts of linear and non-linear optimization techniques are becoming increasingly valuable for many quantitative disciplines. Problems of that nature are typically solved using distinctive optimization algorithms, iterative methods, or heuristics. A new variant of the Accelerated Projection-Based Consensus (APC) iterative method is proposed, which is faster than its classical version while handling large sparse matrices in distributed settings. The algorithm is proposed, and its description and implementation in a high-level programming language are presented. Convergence tests measuring acceleration factors based on real-world datasets are done, and their results are promising. The results of this research can be used as an alternative to solving numerical optimization problems.

9

Estimation of the necessary length of strengthening the pavement structure in the vicinity of a bus stop on the basis of tests carried out in a selected city

Gardas Przemysław, Sołowczuk Alicja

Roads and Bridges - Drogi i Mosty

|

2022

|

Vol. 21, no. 1

39--61

EN

The current design guidelines classify the pavement structure depending on the traffic category KR. In the case of bus stops located along a street, the pavement in "the bus stop area" should be designed for a KR one degree higher than the KR determined on the adjoining carriageway. Assessing the condition of the pavement in the area of 100 bus stops located in a selected city the authors noted the different service condition of the pavement along the bus wheel track in the bus stop area. The deformations of the pavement included settlements, ruts and bumps and the pavement distresses included cracks, potholes, patching, damaged curbs and manholes, etc. The horizontal forces were estimated at 19 selected bus stops variously located relative to the nearest intersection. 12 sectors were distinguished along the bus wheel track in the bus stop area and bus drive through times, speed, decelerations and accelerations were measured in these sectors. The results of the measurements were subjected to statistical analyses and the lengths of the intensified impact of the horizontal forces on the pavement and the extended duration of the bus load impact on the pavement were estimated. After the lengths of the sections with intensified horizontal forces and extended time of the impact on the pavement were compared with the locations of pavement deformations and distresses the necessary lengths of pavement strengthening at the bus stops depending on the latter’s location relative to the nearest intersection were determined. The determined lengths of pavement structure strengthening along the zones of approach to and departure from the bus stop can be used also in other cities.

PL

Obowiązujące wytyczne projektowe klasyfikują konstrukcję nawierzchni w zależności od wyznaczonej kategorii ruchu KR. W przypadku przystanków autobusowych, usytuowanych w ciągu ulicy, nawierzchnia „w rejonie przystanku" powinna być zaprojektowana na KR o jeden stopień wyższą niż KR określona na przyległej jezdni. Oceniając stan nawierzchni w rejonie 100 przystanków zlokalizowanych w wybranym mieście, odnotowano różny stan eksploatacyjny nawierzchni wzdłuż śladu autobusu w rejonie przystanku. Do deformacji nawierzchni zaliczono: osiadania, koleiny i garby, a do uszkodzeń: spękania, ubytki, łaty, uszkodzenia krawężników i włazów, itd. Na wybranych 19 przystankach, różnie usytuowanych względem najbliższego skrzyżowania, oszacowano siły poziome. Wzdłuż śladu autobusu w rejonie przystanku wydzielono 12 sektorów, na których wykonano pomiary czasów przejazdu, prędkości, opóźnień i przyspieszeń autobusów. Uzyskane wyniki poddano analizom statystycznym i oszacowano długości wzmożonego oddziaływania sił poziomych na nawierzchnię i wydłużonego czasu oddziaływania na nią obciążenia. Po porównaniu długości wyznaczonych odcinków wzmożonych sił poziomych i wydłużonego czasu oddziaływania na nawierzchnię z miejscami zlokalizowanych deformacji i uszkodzeń oszacowano ko- nieczne długości wzmocnienia nawierzchni na przystankach autobusowych w zależności od ich lokalizacji względem najbliższego skrzyżowania. Uzyskane wyniki długości wzmocnienia konstrukcji nawierzchni wzdłuż dojazdu i odjazdu z przystanku mogą być wykorzystane również w innych miastach.

10

A review of the factors and input parameters influencing the range of an Edison electric vehicle according to measurements

Gajdáč Igor, Kučera Luboš, Gajdošík Tomáš, Konstantova Viera

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

|

2022

|

Vol. 31, No. 4

270--282

EN

Research and development help improve the reliability of EVs range, battery capacity, and trouble-free charging (or service). These factors affect consumers’ interest in EVs. The quality of EV use can be supported by a modern technology called Energy Assistant (EA). The task of EA is to inform the driver about the current range, the necessity to recharge the batteries, and so on to avoid a critical situation. The main aim of this article was to investigate factors and input parameters for the proposal of EA. The Edison EV designed at the University of Žilina, was used for experimental work under real conditions and in an accredited lab with MAHA equipment.

11

Evaluation of energy consumption in the acceleration process of a passenger car

Mamala Jarosław, Graba Mariusz, Bieniek Andrzej, Prażnowski Krzysztof, Hennek Krystian, Kołodziej Szymon, Mazurek Bartosz, Sproch Maciej

Combustion Engines

|

2022

|

R. 61, nr 3

35--44

EN

The analysis of the vehicle acceleration process is a current topic based on the aspects related to the general characteristics of the car, its parameters, design, drive unit performance, and the influence of external factors. However, the ability to accelerate is essential from the point of view of the active safety of the car. Often the dynamic parameters are determined on the basis of the car acceleration test carried out on a level road with good surface in terms of the acceleration time is not reliable and the credibility of such results depends on many factors. Therefore in the article, the authors assessed the dynamic and energy parameters of the car motion, in which the intensity of acceleration of the car with different intensities was examined. The acceleration intensity test was carried out from the set initial speed of the car of 45 km/h to the final speed of 120 km/h at a constant gear ratio, and the set intensity of the acceleration process resulted from the constant throttle with a constant deflection of the accelerator pedal. Acceleration was carried out in two variants, the first for a normal internal combustion engine and the second for the same engine but additionally equipped with a short-term boost system. In this way, it influences the increase in power and energy in the car drive system, changing its acceleration intensity. Variable car acceleration intensity was obtained in the range from 0.12 to 1.37 m/s2, and energy consumption at the level of 0.4 to 1.2 MJ in the distance of 1/4 mile. The article proposes a combination of energy parameters and engine power in order to assess the acceleration dynamics, for this purpose, the specific energy consumption of the car was determined, ranging from 0.35 to 2.0 J/(kg∙m), which was related to the engine power, denoting it with the dynamics index. The study focuses on the assessment of the relationship between the specific energy consumption and acceleration of passenger cars in the available powertrain system using a new dynamics index. The proposed dynamics index combines the energy and dynamic parameters of the car to be able to objectively quantify the acceleration process.

12

Preliminary driving style classification of the professional drivers

Szumska Emilia M., Stańczyk Tomasz Lech

Archiwum Motoryzacji

|

2022

|

Vol. 98, nr 4

25--39

EN

Driving style and driver behaviour are important in evaluating city bus drivers. Buses are one of the means of public transportation in cities, used by millions of people. The purpose of this study was to present a model for preliminary classification of driving style of the professional drivers based on averaged maximum values of lateral and longitudinal acceleration recorded during regular work. First, the recorded acceleration values of 69 city bus drivers were analysed. Then, the correlation between the acceleration values and the age and experience of the city bus drivers was examined. Based on the results of the preliminary classification of drivers, extreme values for both lateral acceleration and longitudinal acceleration (deceleration and acceleration) were obtained by 3 drivers out of the 69 tested. The study also examined the relationship between averaged values of maximum lateral and longitudinal acceleration and driver age and experience. Based on the correlation results, showed that age and the number of years of holding a driver’s license are not significantly related to acceleration. Therefore, the method can be used to analyse drivers regardless of their age and experience.

13

Comparison of safety barrier parameters in the case of double impact at the same location

Wicher Ewa, Kucharski Dawid

Roads and Bridges - Drogi i Mosty

|

2021

|

Vol. 20, no. 4

345--358

EN

The article describes the double impact of a 900-kg passenger vehicle against a steel safety barrier at the same spot. The crash tests were carried out by the IBDiM Crash Test Team at the test site in Inowrocław. The first crash test was carried out on a new steel safety barrier. The second test was performed on the same barrier, damaged in the first impact. The tests reflected situations encountered on the roads when a safety barrier remains unrepaired for a certain time and another accident occurs. Acceleration severity index (ASI) and theoretical head impact velocity (THIV) were chosen as quantitative measures of the consequences of the impact. The analysis of the parameters obtained from both tests showed that the road steel safety barrier retained its safety level after being hit twice by a passenger vehicle. Based on the observations from crash tests of passenger vehicles with safety barriers, the consequences of such collisions in terms of barrier performance often do not require immediate repairs of the deformed barriers.

PL

W artykule opisano dwukrotne uderzenie pojazdem osobowym o masie 900 kg w stalową barierę ochronną w tym samym miejscu. Próby zderzeniowe zostały wykonane przez Zespół Testów Zderzeniowych IBDiM na poligonie w Inowrocławiu. Pierwszy test zderzeniowy został przeprowadzony na zamontowanej nowej stalowej barierze ochronnej. Drugi test wykonano na tej samej barierze, odkształconej w wyniku pierwszego uderzenia. Miało to na celu odzwierciedlenie sytuacji spotykanych na drogach, gdy bariera ochronna nie została naprawiona, a miał miejsce kolejny wypadek. Jako parametry opisujące w sposób ilościowy skutki zderzenia wybrano wskaźnik intensywności przyspieszenia (ASI) oraz teoretyczną prędkość głowy w momencie zderzenia (THIV). Analiza tych współczynników uzyskanych z obu testów wykazała, że drogowa stalowa bariera ochronna po dwukrotnym uderzeniu w nią pojazdem osobowym zachowała swój poziom bezpieczeństwa. Na podstawie obserwacji testów zderzeniowych pojazdów osobowych z barierami ochronnymi można zauważyć, że skutki takich kolizji z perspektywy funkcjonowania barier ochronnych często nie wymagają ich natychmiastowych napraw.

14

A combined method to predict impact pressure on planing craft

Tahmasvand Hossein, Zeraatgar Hamid

Polish Maritime Research

|

2021

|

nr 1

4--15

EN

Prediction of the pressure distribution on a planing craft in waves deeply affects its structural design and safe operation. In this paper, the possibility of pressure prediction for the planing craft in waves is studied. A combined method is formulated by which craft motions in waves are computed using a 2.5D method, and the impact pressure is anticipated by the equivalent wedge method. Experiments are conducted to record the vertical acceleration and pressure time trends on a model. Comparing the results of the combined method with the experiments indicates that this approach successfully predicts the heave and pitch motions and the time evolution of the acceleration and pressure. The method presents good estimations for the peaks of the acceleration and pressure. Using the combined method, a parametric study on maximum peak acceleration and pressure is also conducted for various forward velocities and wave heights. It has been shown that the combined method is a fast and reliable tool for maximum peak pressure prediction. The method may be employed for structural design and optimization.

15

Modelling of work of the rotor-type blade pump with revolving stator

Dmytriv V. T., Lanets O. S., Dmytriv I. V., Horodetskyy I. M.

International Journal of Applied Mechanics and Engineering

|

2021

|

Vol. 26, no. 4

17--28

EN

In the article, the analytical dependences of modelling the cell cross-sectional area between two adjacent blades of a rotary blade pump and capacity for a pump with fixed and rotating stators are given, and analytical dependences are derived to model the power necessary to overcome the friction forces of the blades. The forces acting on the radially placed blade of a rotary pump with a fixed stator (non-rotating or stationary) and a rotating stator are analyzed. Design and technological parameters that influence the pump capacity and power are taken into account. The power required for the movement of the pump blade without taking into account the compression of the air has the opposite character of the change as to the pump capacity The capacity of a rotary pump with a rotating stator is three times higher than that of a stationary stator. The rotary pump with a rotating stator, with six radially spaced blades, consumes 0.854 [kW] less power to overcome the blade friction of 1313 kW The results of modelling of the pump work are given.

16

To determine the stability of the metrobus in unstable driving modes

Marchuk Roman, Marchuk Nazar, Sakhno Volodymyr, Poliakov Viktor M.

Archiwum Motoryzacji

|

2021

|

Vol. 91, nr 1

63--79

EN

Recently in many cities of the world began to introduce so-called «metrobus» or BRT (Bus Rapid Transit) systems, which became a cheaper alternative to the metro and other rail transport, in particular trams. The aim of the work is to determine the stability indicators of the metrobus in the transitional traffic modes, in particular when performing such manoeuvres as «steering wheel jerk» and «shuffle». For this purpose, the equations of metrobus plane-parallel motion are supplemented by equations of the links of the road train in the vertical plane by halopilation (tangage, trim) and roll. The critical straight-line speed of the three-link metrobus has been determined, which was 32,06 m/s, and this speed is independent of the corners of the steering wheels of the bus and the trailer links. It has been shown that as the steering wheel angle of the bus increases, the difference in the folding angles of the bus increases, with the second folding angle significantly exceeding the first, especially considering the roll of the metrobus body. It has been established that the greatest rolls and loads of the metrobus axles are those of the last trailer, which is the limiting factor for the critical speed. The lateral accelerations of individual metrobus links and their yaw velocity when performing the manoeuvre «steering wheel jerk» and «shuffle, Sl = 24 m», show that both the bus and the second trailer link are a limiting factor when performing various manoeuvres, but the acceleration value does not exceed the permissible 0.4 g, so its stability under these conditions is ensured.

17

Destruction of the Structure of Boiling Emulsions

Pavlenko Anatoliy, Melnyk Viktor

Rocznik Ochrona Środowiska

|

2020

|

Tom 22, cz. 1

70--81

EN

In this paper we consider the processes of dynamic interaction between the boiling particles of the dispersed phase of the emulsion leading to the large droplet breakup. It is indicated the differences in the consideration of forces that determine the crushing of non-boiling and boiling drops. It is determined the possibility of using the model to define the processes of displacement, deformation or fragmentation of the inclusion of the dispersed phase under the influence of a set of neighboring particles. The proposed method allows us to determine the main energy parameters of the homogenization process by boiling the emulsion.

PL

W tym artykule rozważamy procesy dynamicznej interakcji między wrzącymi cząsteczkami zdyspergowanej fazy emulsji, prowadzące do rozpadu dużych kropel. Wskazano na różnice w uwzględnianiu sił, które determinują kruszenie kropli niewrzących i wrzących. Określono możliwość wykorzystania modelu do zdefiniowania procesów przemieszczenia, deformacji lub fragmentacji włączenia fazy rozproszonej pod wpływem zestawu sąsiednich cząstek. Proponowana metoda pozwala określić główne parametry energetyczne procesu homogenizacji podczas ogrzewania i wrzenia emulsji.

18

Sprzętowo-programowa akceleracja algorytmu Argon2d z wykorzystaniem układu SoC FPGA

Zabołotny Bartosz, Araszkiewicz Piotr, Rawski Mariusz

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2020

|

nr 2

23--28

PL

Przedstawiono koncepcję i realizację sprzętowo-programowego akceleratora algorytmu Argon2d. Algorytm ten został wykorzystany w części kryptowalut z tego względu, że jego zastosowanie utrudnia realizację bardziej efektywnych obliczeń na GPU w porównaniu z procesorami x86. Autorzy przedstawili i omówili wyniki testów porównania realizacji czysto programowej z wynikami uzyskanymi z użyciem akceleratora.

EN

The paper presents the concept and implementation of the hardware-software accelerator of the Argon2d algorithm. This algorithm was used in some cryptocurrencies because its use hinders the implementation of more efficient calculations on the GPU compared to x86 processors. The authors presented and discussed the results of tests comparing software implementation with the results obtained using the accelerator.

19

Źródła antropogenicznych anomalii grawitacyjnych i ich znaczenie

Bednarek Stanisław

Przegląd Geodezyjny

|

2020

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R. 92, nr 2

15--19

PL

Artykuł przedstawia zarys problemu antropogenicznych anomalii grawitacyjnych. W odróżnieniu od innych prac, koncentrujących się głównie na anomaliach pochodzenia górniczego, podjęto w nim próbę całościowego ujęcia tematu. W początkowej części artykułu zwrócono uwagę na problemy związane z wyznaczeniem przyspieszenia siły ciężkości oraz znaczenie tej wielkości dla konstrukcji geoidy i dokładności pomiarów geodezyjnych. Zdefiniowano antropogeniczną anomalię grawitacyjną i podano opracowaną przez autora systematyczną klasyfikację jej źródeł. Sformułowano uproszczone modele obliczeniowe dla charakterystycznych typów źródeł. Używając tych modeli, oszacowano wartości anomalii grawitacyjnych, powodowanych przez wymienione w klasyfikacji, reprezentatywne przykłady źródeł i przedyskutowano ich znaczenie.

EN

This article presents the outline of the anthropogenic gravity anomalies problem. In contrast to other papers concerning mining-related anomalies, here a holistic approach to the subject was attempted. In the introductory part of the article, the attention is given to the problems with determination of the gravity acceleration, and the importance of this estimation to the geoid construction and accuracy of measurements in land surveying. An anthropogenic gravity anomaly was defined and a systematic classification of its sources was developed and given by the author. Simplified computational models for the characteristic source types were formulated. Using those models, the values of gravity anomalies were estimated. The anomalies are caused by enumerated in the classification representative examples of sources and their significance was discussed.

20

Traction tests of the special self-propelled rolling stock : aims, methods, experience and prospects

Bolzhelarskyi Yaroslav, Dovhaniuk Stepan, Urshuliak Oleksandr, Daszkiewicz Paweł

Pojazdy Szynowe

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2020

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Nr 4

3--11

EN

Methods and results of experimental determination of the two most important parameters for traction calculations of the DGK-type speeder are given in the article. The first parameter is the specific acceleration, i.e. acceleration from the action of unit of force per unit of weight of the train. The second one is the specific rolling resistance. The results can be used to determine these parameters for different types of OTM.

PL

W artykule podane zostały metody i wyniki eksperymentalnego określania dwóch najważniejszych parametrów do obliczeń trakcyjnych samobieżnego pojazdu typu DGK (spalinowy pojazd inspekcyjny). Pierwszym parametrem jest przyśpieszenie, tj. przyspieszenie liczone z działania jednostki siły na jednostkę masy pociągu. Drugim są opory ruchu. Wynik może być wykorzystany do określenia tych parametrów dla różnego typu OTM (on Track Machines).