Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "inżynieria drogowa" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-3 z 3
    Tytuł:
    Fatigue performance of aging asphalt mixtures
    Odporność zmęczeniowa starzonych mieszanek asfaltowych
    Autorzy:
    Song-tao, L.
    Zhaohui, L.
    Juan, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/945834.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    asphalt pavement
    road engineering
    fatigue
    aging
    stress ratio
    inżynieria drogowa
    nawierzchnia asfaltowa
    zmiany zmęczeniowe
    starzenie
    współczynnik asymetrii
    Opis:
    Fatigue and aging inevitably exist in asphalt pavement. To reveal fatigue characteristics, strength tests were carried out under different loading rates (v). The rules of dynamic loading strength (Sdz) and v were acquired and the real stress ratios corresponding to the fatigue test loading rates were obtained. Fatigue equations describing fatigue life (Nf as a function of the nominal (tm) and real (ts) stress ratios were also acquired. It was discovered that the equations could be extended to the strength failure point (ts = 1, Nf = 1) based on the real stress ratio, but not the nominal stress ratio. The equation provided the theoretical method to design a method to assess aging of asphalt pavement.
    Przeprowadzono testy nawierzchni asfaltowych stosując różne szybkości obciążania (v). Określono zależności matematyczne między wytrzymałością na obciążenia dynamiczne (Sdz) i v oraz równania opisujące trwałość zmęczeniową (Nf) w funkcji rzeczywistego współczynnika asymetrii cyklu (ts) i nominalnego współczynnika asymetrii cyklu (tm). Stwierdzono, że tylko równanie uwzględniające współczynnik ts może być stosowane do ekstrapolacji do punktu wytrzymałości na uszkodzenie (ts = 1, Nf=1). Równanie to pozwala na zaprojektowanie teoretycznej metody oceny starzenia się nawierzchni asfaltowej.
    Źródło:
    Polimery; 2015, 60, 2; 126-131
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An improved mathematical model for vehicle crashagainst highway guardrails
    Autorzy:
    He, L.
    Lin, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/224317.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roadway engineering
    mechanical model
    roadway guardrail
    traffic safety
    lateral rotation
    vehicle crash
    inżynieria drogowa
    model mechaniczny
    bariera drogowa
    poręcz autostradowa
    bezpieczeństwo na drodze
    Opis:
    Highway guardrail is a kind of important road traffic safety facility. When a vehicle is travelling on a highway, it can lose control because of accident. The guardrail can prevent the vehicle from rushing directly out of the road, so as to reduce the injury to the driver in the vehicle. Therefore, the guiding performance, anti-collision performance and buffer performance of the guardrail are important indexes to reflect the highway guardrail safety in the traffic accidents between vehicle and guardrail. The process of collisions between vehicles and guardrails is a complex motion, affected by multiple factors such as the movement patterns and types of vehicles, the types of guardrail, the bending stiffness of the beams, the speed of collision, the angle of collision, etc. The accuracy of energy estimation when vehicle collides with guardrail is the foundation of highway guardrail design, installation and improvement. Many experts and scholars at home and abroad have done a lot of theoretical research and experimental verifications on the safety performance of highway guardrail, and analyzed the anti-collision ability and energy absorption effect of highway guardrail. Single degree of freedom model is the most widely used mathematical model of vehicle collision in highway guardrail. The traditional model is more suitable for calculating the maximum impact force of small vehicles, but it is not accurate for large vehicles. However, due to the unreasonableness of the model in the theoretical derivation process, there is a large error in the mathematical model, especially in estimating the accuracy of the energy value of the large vehicle collision guardrail. Practice shows that the current guardrail cannot withstand the impact of large vehicles. Once large vehicles collide with the corrugated beam guardrail, the guardrail will collapse in most cases, and the vehicle will rush out of the road directly, so it is very difficult to exert the protective function of the guardrail. The anti-collision performance of guardrail is poor, which is related to the existing calculation model, which results in insufficient strength in the design of guardrail.
    Źródło:
    Archives of Transport; 2018, 48, 4; 41-49
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Road network partitioning method based on Canopy-Kmeans clustering algorithm
    Autorzy:
    Lin, Xiaohui
    Xu, Jianmin
    Powiązania:
    https://bibliotekanauki.pl/articles/949836.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic engineering
    road network
    road network partition
    Canopy-Kmeans algorithm
    macroscopic fundamental diagram
    inżynieria ruchu
    sieć drogowa
    sterowanie siecią drogową
    algorytm Canopy-Kmeans
    Opis:
    With the increasing scope of traffic signal control, in order to improve the stability and flexibility of the traffic control system, it is necessary to rationally divide the road network according to the structure of the road network and the characteristics of traffic flow. However, road network partition can be regarded as a clustering process of the division of road segments with similar attributes, and thus, the clustering algorithm can be used to divide the sub-areas of road network, but when Kmeans clustering algorithm is used in road network partitioning, it is easy to fall into the local optimal solution. Therefore, we proposed a road network partitioning method based on the Canopy-Kmeans clustering algorithm based on the real-time data collected from the central longitude and latitude of a road segment, average speed of a road segment, and average density of a road segment. Moreover, a vehicle network simulation platform based on Vissim simulation software is constructed by taking the real-time collected data of central longitude and latitude, average speed and average density of road segments as sample data. Kmeans and Canopy-Kmeans algorithms are used to partition the platform road network. Finally, the quantitative evaluation method of road network partition based on macroscopic fundamental diagram is used to evaluate the results of road network partition, so as to determine the optimal road network partition algorithm. Results show that these two algorithms have divided the road network into four sub-areas, but the sections contained in each sub-area are slightly different. Determining the optimal algorithm on the surface is impossible. However, Canopy-Kmeans clustering algorithm is superior to Kmeans clustering algorithm based on the quantitative evaluation index (e.g. the sum of squares for error and the R-Square) of the results of the subareas. Canopy-Kmeans clustering algorithm can effectively partition the road network, thereby laying a foundation for the subsequent road network boundary control.
    Źródło:
    Archives of Transport; 2020, 54, 2; 95-106
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies