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2021中国汽车工程学会年会暨展览会

作者： Lyu Pin Zhang Meng Tang Tianbao Deng Xiaolong Hu Junfeng Lan Jun Ningbo Geely Royal Engine parts Co. Ltd.

This paper takes gear order whine in electric drive mode of hybrid transmission as research *** on gear static transmission error,considering the influence of speed excitation,shafting frequency and housing flexibility,the paper analyzes bearing dynamic reaction and vibration velocity of *** optimizing shafting and housing layout to decrease bearing dynamic supporting force,the gear whine noise can be reduced obviously,this research has good guiding significance for development of gearbox.

关键词： dynamic excitation gear whine transmission error vibration gearbox

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dynamic evaluation of jack-up platform structure under wave, wind, earthquake and tsunami loads

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Journal of Ocean Engineering and Science 2022年第1期7卷 41-57页

作者： Zaid Mohammed Ghazi Imad Shakir Abbood Farzad Hejazi Department of Civil Engineering Universiti Putra MalaysiaMalaysia Engineering Affairs Department Sunni Endowment DiwanBaghdadIraq

Nowadays,the demand for using jack-up platforms to carry out a large percentage of deep-water oil and gas exploration is steadily *** response of jack-up platforms to the severe dynamic loads that may be encountered during the structure life is not examined ***,this study attempts to investigate the response of jack-up platforms performance under the effect of dynamic loads due to wave,wind,earthquake and tsunami forces using the finite element method for two models with the lowest and highest hull *** jack-up platform is located in the Gulf of *** ac-celerations are applied to the model in high and moderate seismic *** addition,tsunami waves are applied to the platform in three different directions at 0°,45°and 90°.This study utilised Airy’s linear wave approach to assess the surface elevations and wave *** reference wind velocity is 10 knots at 10 m over the mean water *** indicate that the dynamic response of the structure is affected by the height of the platform and by the increase of the platform hull *** combination of the El-Centro earthquake,dead and live loads provides the major impact on the platform at the lowest(70 m)and highest(85 m)hull *** comparison of all result proves that the jack-up platform hull under high earthquake intensity and tsunami waves with 45°has experienced maximum ***,raising the deck will increase the response of the dynamic load and displacements but will negatively affect the platform.

关键词： Offshore structures Earthquake dynamic excitation Jack-up platform Tsunami Seismic zone

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Performance of a base isolator with shape memory alloy bars

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Earthquake Engineering and Engineering Vibration 2007年第4期6卷 401-408页

作者： Fabio Casciati Lucia Faravelli Karim Hamdaoui Dept. of Structural Mechanics University of Pavia Pavia Italy

A new and innovative base isolation device is introduced in this paper based on extensive research carried out by the authors and their co-workers. A prototype of the device was built and experimentally tested on the shaking table. The new base isolation device consists of two disks, one vertical cylinder with an upper enlargement sustained by three horizontal cantilevers, and at least three inclined shape memory alloy （SMA） bars. The role of the SMA bars is to limit the relative motion between the base and the superstructure, to dissipate energy by their super-elastic constitutive law and to guarantee the re-centring of the device. To verify the expected performance, a prototype was built and tested under sinusoidal waves of displacement of increasing frequency with different amplitudes. It is shown that the main feature of the proposed base isolation device is that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated.

关键词： base isolator dynamic excitation energy dissipation shape memory alloy shaking table test

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Nonlinear aspects of energy dissipation in wood-panel joints

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Earthquake Engineering and Engineering Vibration 2007年第4期6卷 259-268页

作者： Sara Casciati ASTRA Dept. School of Architecture University of Catania at Siracusa 96100 Siracusa Italy

The joints connecting vertical and horizontal elements are the ＂weak link＂ in structural systems assembled from wood panels. If they are too weak, local failures may occur, resulting in performance that is significantly below expectations. If they are too resistant, the joints may be unable to dissipate energy during vibrations, thus possibly initiating a fast progressive failure. This paper re-processes and re-elaborates the results of shaking table tests previously carried out by the author and other co-workers. The goal is to assess the feasibility of a joint which is able to dissipate energy during vibration, without degrading the connection performance.

关键词： dynamic excitation energy dissipation wood panels joint monitoring system shaking table tests

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