Abstract: One of the basic tasks of the accident reconstruction is to define values of parameters of participants of the accident before its actual occurrence. The assessment of correct behaviours is made and the court decides whether the accident participants are guilty or innocent. Therefore, the credibility of specific values is essential. The use of so-called accident recorders - EDR/ADR type of devices, as an alternative compared to classical methods for accidents reconstruction - has become more common over the past years. The paper includes basic notions related to his type of devices, describes potential sources of uncertainty of the car motion reconstruction results obtained on the basis of their records. The examples presented confirm their usefulness, however, they also indicate possible significant errors in the motion parameters assessment if simplified devices are used (where vehicle body lean movements in motion are not analysed).

W pracy opracowano wzór na minimalną długość strefy rozgałęźnej współczesnych górek rozrządowych. Wyniki pracy mogą być wykorzystane do obliczeń kinematycznych górek oraz obliczeń zajętości terenu pod stacje rozrządowe, manewrowe i zakładowe.

Problem of optimal system controlling a motion of the plant consisting of twomasses connected with a non-linear spring is considered in the paper. For example such plants can be motorcars with trailer or dumb barge pulling by ship. The irregular motion of elements of such plants influences negative on consume energy. In addition, because of safety, the speed of motion should be limited.

An accurate description of behavior of bituminous mixes is necessary to adequately predict and evaluate the time dependent characteristics and the evolution of pavement distress. The generalized Maxwell model, currently considered to be one of the most suitable to characterize mechanical behavior of viscoelastic materials and widely used in many commercial FEM codes, is presented. A Prony series expansion implemented in ABAQUS code, is used to express the material’s behavior. The theoretical background of the model is briefly discussed. Finally, the model was efficiently used for numerical simulation of stress relaxation experiment.

jące do zwiększenia wydajności transportu wodnego śródlądowego wymaga zastosowania skutecznych technologii zarządzania ruchem statków. Wykorzystanie rozwiniętych technologii informacyjnych i komunikacyjnych, systemów łączności, przetwarzania i transmisji danych oraz ich archiwizowania musi być skuteczne, zatem oparte na prostych systemach. Wskazanym byłoby wykorzystanie już istniejących i sprawdzonych w działaniu, powszechnie stosowanych metod i systemów co zapewniłoby niezawodność proponowanych rozwiązań.