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Ganbo Zhang, Yao Zhao and Wei Chu
Propeller-induced longitudinal vibration resonance in marine propulsion shafting systems causes great harm to the hull structure and is the primary source of shipboard noise. Integrating a friction damper with designed parameters into thrust bearings can...
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Wei Chu, Yao Zhao, Ganbo Zhang and Hua Yuan
The longitudinal vibration of the propulsion shaft system is a challenging issue for marine noise management. We conducted various static and dynamic tests on our built test rig for the shafting system, presenting the results in this paper. By combining ...
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Marcelo Rodrigo Carreira, Pedro Gutemberg de Alcântara Segundinho, Francisco Antonio Rocco Lahr, Antônio Alves Dias, Carlito Calil Júnior
Pág. 27 - 32
The grading of structural lumber besides contributing for increasing the structure's safety, due to the reduction of the material variability, also allows its rational use. Due to the good correlation between strength and bending stiffness, the latter ha...
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Wencheng Wu, Cheng Chang, Tao Li, Hongji Hu, Zhonglin Zhou, Wenhao Yang, Jinyue Guo, Peixu Zhu, Ju Li, Jianfeng Hu, Hong Cheng, Youfeng Tao, Wei Zhou, Fei Deng, Yong Chen, Wanjun Ren and Xiaolong Lei
Sowing quality is directly influenced by the seed-filling characteristics of a centralized seed-metering device, and vigorous seed-motion status deteriorates seeding performance resulting from field surface roughness, seeder vibration, etc. However, the ...
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Anatoliy Kovtun, Volodymyr Tabunenko, Sergiy Nesterenko
Pág. 134 - 140
The subject of research in the article is the process of vibratory movement of tangent structures in closed volumes (pipes). The purpose of this work is to investigate the mechanism of vibrational movement of tangent structures in closed volumes (pipes)....
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Jingjing Yang, Qiang Zhang and Taojin Xu
The proposed scissoring-type actuator can successfully degenerate longitudinal vibration into scissoring vibration at an actuator tip with broad output frequencies and higher efficiency for potential medical applications.
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Chaonan He, Linqing Zhou and Xinwei Ma
The marine fishery will be the main form of the marine economy in the future. Simulating a hydrodynamic response under normal and extreme working conditions is the main means of structural analysis and design of a mariculture ship. In this paper, a simul...
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Qianwen Huang, Haiyun Liu and Jiyin Cao
Severe vibrations of the marine propulsion shaft can evidently affect the dynamical response of the propulsion system and degrade the performance of a ship. As the vibration forms couples which interact with each other, a better understanding of the coup...
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A. S. Raspopov
Pág. 188 - 192
The associated matrices are obtained and the technique of their application for calculation of continuous plate vibration with continuous distribution of mass and various boundary conditions is developed. The solutions for free vibrations of orthotropic ...
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Dongyang Yu, Jianfei He, Feihu Peng, Cheng Qian, Ying Zang, Minghua Zhang, Wenwu Yang, Guoxiang Zeng, Jianpeng Chen, Wei Qin and Zaiman Wang
To elucidate the vibrational characteristics of power chassis in paddy fields, we examined the Yanmar VPG6G rice transplanter across diverse terrains, including paddy fields, dry land, and concrete roads. Vibrational acceleration measurements, taken in l...
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Ming Ding, Jinhui Jiang, Fang Zhang, Xiao Liang and Nansun Shen
Helicopter gearbox support strut is one of the main research objects in the field of vibration and noise control in helicopter cabins. Aiming to further widen the vibration attenuation range of traditional Bragg periodic struts, a novel type of Local res...
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Vu Nam Pham, Dinh Kien Nguyen, Buntara Sthenly Gan
Pág. 152 - 164
Free and forced vibration analysis of two-directional functionally graded sandwich (2D-FGSW) beams using a shear deformable finite element formulation is presented. The beams considered in this paper consists of three layers, a homogeneous ceramic core, ...
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Hongye Gou, Wen Zhou, Changwei Yang, Yi Bao and Qianhui Pu
In this study, a dynamic response analysis procedure is proposed and applied to investigate the dynamic responses of a straddle-type concrete-filled steel tube tied arch bridge under train and truck loadings. A numerical model of the coupled monorail tra...
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Divino Eterno Teixeira
Modulus of elasticity (MOE) of Douglas-fir (Pseudotsuga menziesii) lumber loaded in parallel to grain tension was evaluated by nondestructive techniques (transverse vibration and longitudinal stress wave) and the results were correlated to the actual pro...
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Bin Zhou, Yingxin Hui and Xiaobo Zheng
This study proposes a stress analysis method of reinforced concrete (RC) box girder based on damage to reveal the dynamic mechanical response and damage mechanisms of a bridge under moving vehicle load. The effect of different vehicle mass, speed, concre...
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Lixia Li, Haiteng Hu and Xiaolan Wu
In this paper, we propose an acoustic black hole radial elastic metamaterial (AREM). Through the study of its dispersion relations, it is found that, compared with the conventional elastic metamaterial, the AREM gathers energy at the tip of the black hol...
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Chaeog Lim, Ik-seung Han, Ju-Young Kang, Im-jun Ban, Byungkeun Lee, Jun Soo Park and Sung-chul Shin
Global ship analysis is conducted using a finite element model (FE model) for ship design and construction, which involves structural, motion, and vibration analyses. It is crucial to examine the structural safety of the hull and motion response. In the ...
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Qingbin Zhang, Zongxian Zhang, Congshi Wu, Junsheng Yang and Zhenyu Wang
The effect of a blasting vibration from an excavating tunnel on an adjacent excavated tunnel is of great importance for the stability and security of twin tunnels. Due to the relatively small distance between the tunnel face of the excavating tunnel and ...
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Jianmin Qiu, Ying Yang, Xin Hong, Piotr Vasiljev, Dalius Mazeika and Sergejus Borodinas
This paper presents a disc-type ultrasonic piezoelectric motor, which is designed for micro flying vehicles. It provides a high output rotation speed under low operating voltage, compared with common piezoelectric devices, by employing a ?contact teeth? ...
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Anatoliy Bovsunovsky,Aleksandr Litvinenko,Sergey Kadomsky,Yiuriy Boyko
Pág. 26 - 32
Existing experimental studies of the sensitivity of damping characteristics to the presence of cracks in structural elements are contradictory. Some studies declare high damping sensitivity but others conclude that a change in the dissipative ability of ...
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