Article
Engineering, Multidisciplinary
E. Yarar, A. Tamer Erturk
Summary: This study numerically investigated the factors affecting average shot velocity in the Surface Mechanical Attrition Treatment (SMAT) process. A numerical model was developed using the finite element method, and the effects of frequency, amplitude, and projection distance parameters on shot velocity were simulated. Response Surface Methodology (RSM) and ANOVA tables were used for evaluation. The results showed that apart from frequency and amplitude, projection distance also had a significant impact on shot velocity.
Article
Chemistry, Multidisciplinary
Mustafa Ghazi, Josiah Rippetoe, Raghuveer Chandrashekhar, Hongwu Wang
Summary: This study evaluated the vibration characteristics of four commercially available focal vibration devices and identified effective ranges of focal vibration frequency and amplitude. The results highlight the importance of considering the vibration environment when quoting vibration characteristics. Additionally, the inconsistency output of multi-actuator devices was discussed, providing guidance for protocol development and potential improvements for focal vibration devices.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Shuo Hou, Xilong Zhang, Jiang Liu, Shuangxiu Fan, Yongliang Zhang, Min Li
Summary: The heat transfer and flow properties of a serrated heat transfer surface with external vibration excitation were investigated using numerical simulation. The study found that vibration can interfere with airflow, causing it to form a certain angle with the fin wall and consequently enhancing heat transfer. Amplitude has a smaller impact on vibration-strengthened heat transfer compared to frequency, and low wind velocity favors vibration-strengthened heat transfer.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Fisheries
Amelia F. MacKenzie, Katerina Basque, Ella A. Maltby, Michelle Hodgson, Alexa Nicholson, Emmerson Wilson, Robin Stuart, Truis Smith-Palmer, Russell C. Wyeth
Summary: The study tested the effectiveness of four commercial aquaculture netting options in preventing biofouling, and found that only Netminder (R) significantly delayed fouling and supported greater mussel biomass. However, all netting treatments reached biofouling saturation within six weeks.
Article
Engineering, Marine
Si-Qin Ye, Hu Ding, Sha Wei, Jin-Chen Ji, Li-Qun Chen
Summary: This paper investigates the vibration characteristics of a slightly curved pipe conveying fluids in a supercritical range for the first time. The analytical predictions agree well with numerical results obtained using different methods, providing useful information for further studies of fluid-conveying pipes with geometric imperfections.
Article
Agronomy
Volodymyr Bulgakov, Simone Pascuzzi, Valerii Adamchuk, Jaroslav Gadzalo, Volodymyr Nadykto, Juri Olt, Janusz Nowak, Viktor Kaminskiy
Summary: Soil temperature variation at different depths is an important process during soil surface tillage. The study found that the amplitude of temperature oscillation decreases with depth, following a logarithmic law. The temperature difference between the 0-5 cm and adjacent 5-10 cm layers is the greatest. This is favorable for fallow tillage technology where the soil is cultivated to a depth of no more than 5 cm under moisture deficit conditions. A decrease in the frequency of soil temperature oscillations can result in reduced heating in different layers. A decrease in soil thermal diffusivity leads to lower amplitude and delayed maximum of soil temperature oscillations.
Article
Acoustics
He Wang, Zhen Chen, Jiahai Huang
Summary: A rotary valve is developed to obtain accurate high-frequency sinusoidal vibration waveforms, and a uniaxial electro-hydraulic shaking table is constructed to superpose these waveforms. The method is effective for generating accurate non-sinusoidal vibration waveforms, with minimal error and impact from working conditions.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Engineering, Marine
Zhen Wang, Jinsong Zhu, Zhitian Zhang
Summary: By using numerical, experimental, and field measurements, a large amount of data on vortex-induced vibration (VIV) of circular cylinders has been obtained. Machine learning (ML) models are developed in this study to predict the transverse VIV amplitude Y* and amplitude-velocity relations. Three ML techniques, including support vector regression with particle swarm optimization, extreme learning machine, and improved extreme learning machine combined with preprocessed least squares QR decomposition, are employed. The results demonstrate acceptable prediction accuracy for all algorithms, with the ELM-type algorithm performing the best.
Article
Materials Science, Ceramics
Wenbin Tang, Yuequn Wang, Guanglei Xiang, Xuefeng Zhao, Zhiyong Pan, Yiping Wang, Ying Yang, Yaojin Wang, Guoliang Yuan
Summary: In this study, Fe2O3-doped high-power piezoelectric ceramics PZMNZT-0.15Fe were prepared, which showed excellent electrical properties with a piezoelectric coefficient of 315 pC/N, mechanical quality factor of 1738, and an output vibration velocity of 0.90 m/s, 2.25 times higher than commercial PZT4 ceramic. This work reveals the competitiveness of PZMNZT-0.15Fe ceramic for high-power applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jie Dong, Shuai Zhang, Zhi-Hui Wu, Jian-Lin Hu, Yu-Qian Liu, Yin-Chen Wang, Si-Wu Cheng
Summary: This paper investigates the factors influencing the stability of sand anchors under vibration loads. The study conducted theoretical analysis and indoor model tests to examine the load-bearing performance of sand anchors, as well as the failure forms of sand anchor systems, sand soil moisture contents, and vibration parameters. The results show that higher water content leads to decreased cohesive force of the sand and increased displacement, resulting in fatigue failure of the anchor solids.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Weiye Huang, Junyi Wu, Wenxin Li, Guojin Chen, Changyong Chu, Chao Li, Yucheng Zhu, Hui Yang, Yan Chao
Summary: In this study, a micro-vibration platform was designed to etch silicon nanowires (SiNWs) using the metal-assisted chemical etching (MaCE) technique. The etching mechanism of SiNWs was investigated by characterizing the SiNW's length as a function of MaCE combined with micro-vibration conditions such as vibration amplitude and frequency. The experimental results using scanning electron microscopy (SEM) showed that the etching rate was continuously improved with increasing amplitude and reached its maximum at 4 μm. Increasing the frequency did not help to improve the etching effects.
Article
Automation & Control Systems
Jinchuan Yang, Pingfa Feng, Jianfu Zhang, Jianjian Wang
Summary: A novel full wedge-type insert mounting method was developed and its performance was evaluated through simulation and experiments. The results showed that the full wedge-type threaded connection method had less intense vibration amplitude fluctuations compared to the ordinary threaded connection method during insert mounting, which can be attributed to the contact force amplification effects on the wedge-type interface.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Tao Wang, Xiaoyu Wu, Guoqing Zhang, Bin Xu, Yinghua Chen, Shuangchen Ruan
Summary: Micro-milling is a flexible and promising fabrication process, with the study analyzing the influence of seven identified factors on frequency spectrum characteristics. Experimental validation was conducted to correlate the factors to the surface profile models. The research has potential applications in predicting and controlling the spatial content of machined surfaces.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Qing Zhang, Yu-xing Peng, Zhen-cai Zhu, Xiang-dong Chang, Hao Lu, Zhou Zhou, Guo-hua Cao, Wei Tang, Guo-an Chen
Summary: The influence of longitudinal vibration on the tribological characteristics and wear mechanism of multi-layer winding hoisting wire rope was investigated. The coefficient of friction, maximum temperature, and vibration intensity showed different trends under different amplitudes and frequencies. The main wear mechanisms were abrasive wear and adhesive wear, with amplitude having a greater impact on the oxidation degree than frequency.
Article
Instruments & Instrumentation
Chongyang Zhao, Zhenzhou Wang, Xiaobo Wang, Bo Zhao
Summary: This paper designs an acoustic system of asymmetrical structure based on the theory of wave. The frequency equation and structural dimension of the asymmetrical structural horn (ASH) were obtained, and the influence of different structural parameters on the resonance frequency and amplification coefficient of ASH was analyzed. The results showed that ASH met the requirements of amplitude in ultrasonic assisted machining.
SMART MATERIALS AND STRUCTURES
(2022)