Temat: split - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The influence of non-axisymmetric pulse shaper position on SHPB experimental data
Autorzy:: Panowicz, R.
Janiszewski, J.
Kochanowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/280350.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: split Hopkinson pressure bar
pulse shaping technology
high-strain-rate testing
Opis:: The results of experimental and numerical analysis of the influence of the non-axisymmetric pulse shaper position on recorded wave signals in the split Hopkinson pressure bar experiment are presented. The paper focuses attention on the problem of wave signal disturbances caused by a bending wave resulting from non-axisymmetric pulse shaper positions and, moreover, different shaper thickness, striker impact velocities and Wheatstone bridge configurations. The obtained results of analyses indicate that the effect of the non-axisymmetric pulse shaper position may be neglected if deviation from the bar axis does not exceed 20%.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 873-886
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical and experimental investigation on nonlinear dynamic characteristics of planetary gear train
Autorzy:: Zhang, Jianwu
Guo, Han
Yu, Haisheng
Zhang, Tong
Powiązania:: https://bibliotekanauki.pl/articles/1839620.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: deep hybrid transmission
power split devices
lumped parameter model
dynamic instability
Opis:: A deep hybrid electric vehicle (DHEV) equipped with a Ravigneaux compound planetary gear train (PGT) encounters severe gear whine noises during acceleration in the EV drive mode. For the analysis of vibro-acoustic sources, a 5DOF lumped-parameter vibration model for the PGT dynamic system is established as well as sound pressures radiated from the transmission on a test bench are measured for data processing and recognition. By comparison between numerical and experimental analyses, natural vibration modes of the PGT are examined and high frequency modal resonances in association with the planetary gears are observed only to cause narrow band whine noises. Furthermore, a 2DOF reduced dynamic model for the planetary gears with consideration of nonlinearities such as time-varying mesh stiffness and backlash is proposed, and numerical solutions to bifurcations and dynamic instabilities of the two sets of planetary gears are obtained. It is found that nonlinear vibration behaviour of the long and short planets are major causes of shock and vibration of the hybrid transmission. Severe vibro-acoustic noises excited dominantly by the planetary gears are alleviated after implementing micro-geometry modifications to the PGT.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 1009-1022
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Estimation of ballistic performance of armor steels based on the split Hopkinson shear bar data
Autorzy:: Walicki, Marek
Janiszewski, Jacek
Cieplak, Kamil
Powiązania:: https://bibliotekanauki.pl/articles/2086939.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: split Hopkinson pressure bar
high strain-rate shearing
ballistic resistance
armor steels
Opis:: The paper presents a method of assessing of ballistic resistance of four armor steels based on the results of shear tests under dynamic load conditions. All shear tests were performed using a newly developed flat material specimen with two shear zones. High strain-rate experiments were performed using the spilt Hopkinson pressure bar technique. In addition, the V50 ballistic resistance tests for the armor steels were carried out. The maximum value of the shear strain energy density (SSED) was adopted as the evaluation criterion. The SSED parameter takes the highest average value for the armor steel with the highest ballistic resistance.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 129--140
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Energy management strategy of dual planetary hybrid electric vehicle based on optimal transmission efficiency
Autorzy:: Wang, Shangxu
Li, Jiaxin
Shi, Dehua
Sun, Xiaoqiang
Yao, Yong
Powiązania:: https://bibliotekanauki.pl/articles/279483.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: power split hybrid electric vehicle
mechanical point
fuzzy torque distribution
fuel economy
Opis:: A power split hybrid electric vehicle with dual planetary gear sets is studied in this paper. Firstly, the power split and circulation phenomenon are further described by analyzing a speed and torque relationship between the engine, motors and the output shaft based on the lever analogy. The transmission efficiency and the electric power ratio are then obtained. The working modes of the hybrid electric vehicle (HEV) are divided according to the system operation mechanism. On this basis, the engine optimal operating line (OOL) control strategy and the mechanical point (MP) control strategy are designed. Furthermore, a fuzzy controller is designed to realize the optimal torque distribution of the engine and the motors in the MP control strategy. Simulation results demonstrate that the MP control strategy can guarantee a higher efficiency of the transmission system, which also shows good performance in improving fuel economy of the HEV by adjusting the engine operating point.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 383-396
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modified Split Hopkinson Pressure Bar for investigations of dynamic behaviour of magnetorheological materials
Autorzy:: Frąś, L. J.
Pęcherski, R. B.
Powiązania:: https://bibliotekanauki.pl/articles/280510.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Split Hopkinson Pressure Bar (SHPB)
Magnetorheological Fluid (MRF)
dynamic behaviour
solidification in magnetic field
ferroelements
Opis:: The magnetorheological fluid is a functional material that is changing its rheological properties and finally solidifies in a magnetic field. The dynamic behaviour, tested with the use of the Split Hopkinson Pressure Bar is an important issue for description of this material, which is commonly used in different kinds of shock absorbers. This note presents a new idea how to modify the known SHPB set up in order to investigate dynamic properties of magnetorheological materials.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 323-328
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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