Wyniki wyszukiwania - BazTech

1

Simulation study of the method of random kinematic road excitation’s reconstruction based on suspension dynamic responses with signal disruptions

Klockiewicz Zbyszko, Ślaski Grzegorz, Spadło Mikołaj

Vibrations in Physical Systems

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2019

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Vol. 30, nr 2

art. no. 2019208

EN

The paper presents the results of simulation studies of the method of random kinematic road excitation’s reconstruction based on the dynamic responses of the suspension acquired in road tests. The method uses registered unsprung mass accelerations as well as model of suspension’s vertical dynamics and tracking control with PID controller to monitor unsprung mass accelerations’ signal in simulation. In the simulation the quality of reconstruction of random irregularities of the road profile was tested. The road profiles were generated based on their power spectral density of road profile heights that is in line with the description given in ISO 8608 standard. Four road classes had their profiles estimations tested – A, B, C and D (corresponding to highways through city roads to the very bad quality roads). The influence of the simulated noise in the suspension’s dynamic response signal – i.e. unsprung mass acceleration – was also tested. The methods of processing of the initial acceleration’s signal from the road tests were proposed and achieved accuracy was defined. Lastly, the necessary requirements to use the method effectively were defined and its limitations were listed.

2

Analysis of vehicle’s suspension’s dynamic responses during test track rides and real exploitation

Klockiewicz Z., Ślaski G.

Journal of Mechanical and Transport Engineering

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2018

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Vol. 70, No. 3

25--40

EN

The following paper presents a study of dynamic responses of a passenger vehicle in typical exploitation conditions. It describes the process of acquiring data from the test rides and their further analysis using statistical values using MatLab. The analysis focuses on accelerations of sprung and unsprung mass, suspension deflection and its speed, comparing the values achieved on different road surfaces, taking into account safety limits and suspension characteristic. The data acquired are presented as graphs of density of probability and cumulative empirical probability, as well as tables listing dynamic responses undergoing analysis. The results allow for estimation of expected dynamic responses of a vehicle, thus making the preparation of future experiments more thorough.

PL

Niniejszy artykuł opisuje badania odpowiedzi dynamicznych zawieszenia samochodu osobowego w typowych warunkach eksploatacyjnych. Zaprezentowano w nim sposób pozyskania danych z jazd testowych i ich dalszej analizy statystycznej w programie Mat-Lab. Analiza skupia się na przyspieszeniach masy resorowanej i nieresorowanej, ugięciu zawieszenia i jego prędkości, porównując wartości otrzymane na różnych typach nawierzchni z uwzględnieniem typowych ograniczeń prędkości na danym typie drogi i charakterystykę zawieszenia. Zebrane dane ukazane są w formie wykresów gęstości prawdopodobieństwa i skumulowanej częstości oraz tabel opisujących analizowane odpowiedzi dynamiczne. Wyniki pozwalają na określenie przybliżonych wartości odpowiedzi dynamicznych, tym samym ułatwiając przygotowanie przyszłych badań.

3

Dynamic responses of a gantry crane system due to a moving body considered as moving oscillator

Zrnić N. D., Gašić V. M., Bošnjak S. M.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 1

243--250

EN

This paper discusses a combined finite element and analytical method for obtaining transverse and longitudinal vibrations of a gantry crane system subjected to an elastically suspended moving body. The two-dimensional inertial effects of the moving body are included in derivation of differential equation of motion for the system. Factors as speed, acceleration and suspension characteristics of a moving body are studied, including the influence of structural damping. The obtained results validate the presented approach and can be used in the design process of gantry cranes.