Nonlinear Numerical Analysis on a New Type of Composite Shell

2009 ◽  
pp. 1043-1050
Author(s):  
Qibin Zhang ◽  
Zhuobin Wei ◽  
Changhong Huang
Keyword(s):  
Numerical Analysis ◽  
Composite Shell ◽  
New Type

Sublimation of composite ice and its influence on performance of ice shells

2021 ◽  
Vol 36 (1) ◽  
pp. 67-77
Author(s):  
Yue Wu ◽  
Junkai Huang ◽  
Jiafeng Chen
Keyword(s):  
Numerical Simulation ◽  
Shell Structure ◽  
Composite Shell ◽  
Engineering Practice ◽  
Sublimation Rate ◽  
Long Span ◽  
Static Performance ◽  
New Type ◽  
Ice Sublimation ◽  
Composite Shell Structure

The long-span ice composite shell structure is a new type of ice and snow structure developed in recent years. The engineering practice of ice composite shell shows that sublimation is one of the important reasons for its damage and even collapse. In this paper, we firstly supplemented the existing H-K equation and obtained the revised ice sublimation equation through indoor evaporative plate experiment considering the influence of admixtures and wind speed. Afterwards, combining the simulations of solar radiation and CFD, the numerical simulation of sublimation distribution on the surface of were realized by programming in Grasshopper platform. During sublimation, the thickness of the ice composite shell decreases by 0.38 mm every 10 days and the sublimation rate on the sunny side was 1.7 times that on the shady side. Finally, the static performance and stability of the sublimated ice composite spherical shell were analyzed. After 70 days of sublimation, the thickness of the ice composite shell structure becomes thinner and uneven, which leads its sensitivity to external load increases.

Wave Response of a Semisubmersible Floating Structure Model With Mechanical Connectors

2008 ◽  
Author(s):  
Yoshiyasu Watanabe ◽  
Koichiro Yoshida
Keyword(s):  
Numerical Analysis ◽  
Response Analysis ◽  
Structure Model ◽  
Analysis Program ◽  
Floating Structure ◽  
Response Characteristics ◽  
Wave Response ◽  
New Type ◽  
Hydroelastic Response ◽  
Two Bodies

It is desired instead of welding to develop a mechanical connector, which may work well to connect two units at the site in spite of circumstances of some extent of relative motions between two units caused by waves. One of the authors proposed a new type of mechanical connector, which is based on an idea of three bodies problem instead of usual mechanical connectors (two bodies problem). In this paper, wave exciting tests of a semisubmersible floating structure model with the proposed mechanical connectors of 1/100 scale and the numerical analysis using hydroelastic response analysis program VODAC are carried out and wave response characteristics of the semisubmersible floating structure model with the mechanical connectors and its feasibility are reported.

Static Characteristics of the Regular and Reversible Rotation Type Herringbone Grooved Journal Bearing

1989 ◽  
Vol 111 (3) ◽  
pp. 484-490 ◽  
Author(s):  
Nobuyoshi Kawabata ◽  
Yasumi Ozawa ◽  
Shuji Kamaya ◽  
Yutaka Miyake
Keyword(s):  
Numerical Analysis ◽  
Journal Bearing ◽  
Load Capacity ◽  
Maximum Load ◽  
Radial Load ◽  
Static Characteristics ◽  
Oil Film ◽  
New Type ◽  
Load Component ◽  
Reversible Rotation

A new type herringbone grooved journal bearing, which produces an oil film bearing pressure with a shaft or bearing rotation in either direction, is proposed in this paper. A numerical analysis of the bearing parameters using the narrow groove theory and the Gu¨mbel condition confirmed that the load capacity of this bearing and the radial load component (related to stability) do not differ greatly from those of a conventional bearing. The values of the bearing parameters which give maximum load capacity, and the values of the load capacity and its direction angle are also determined numerically for the case of either grooved member or smooth member rotation.

Numerical Analysis and Experimental Study on Consolidation of the Squeezed Branch Pile

2014 ◽  
Vol 889-890 ◽  
pp. 1392-1397
Author(s):  
Ya Jun Yin ◽  
Guang Han Xu ◽  
Yong Mei Qian
Keyword(s):  
Numerical Analysis ◽  
Experimental Research ◽  
Variable Cross Section ◽  
Load Test ◽  
Variable Cross ◽  
Static Load Test ◽  
Pile Diameter ◽  
Consolidation Settlement ◽  
New Type ◽  
Research Show

The squeezed branch pile is a kind of frictional end bearing pile which is variable cross-section, a new type of pile foundation with characteristics of high bearing capacity and low settlement. In order to explore vertical settlement regularity of the squeezed branch pile, this paper carries out the theoretical analysis and experimental research on the consolidation settlement law of the squeezed branch pile through the numerical method and static load test. The results of numerical analysis and experimental research show that vertical consolidation settlement is reduced along with increase of the squeezed branch pile diameter, and the settlement of the squeezed branch pile is given priority to consolidation.

Research on a New Type of Ultrasonic Polishing Vibrator

2011 ◽  
Vol 299-300 ◽  
pp. 1132-1135
Author(s):  
Qing He ◽  
Ying Hua Li ◽  
Kai Jia ◽  
L. Li
Keyword(s):  
Numerical Analysis ◽  
Silicon Wafer ◽  
Ultrasonic Vibration ◽  
Polishing Process ◽  
Semiconductor Silicon ◽  
New Type

Aiming at the ultrasonic vibration polishing technology of silicon wafer, this paper proposes a disc-shaped ultrasonic piezoelectric polishing vibrator of out-of-plant bending travalling wave. Basing on numerical analysis, the principle prototype of the polishing vibrator has been designed and produced, and then tested. This polishing vibrator can be used in polishing process of semiconductor silicon wafer.

scholarly journals Study on the virus transmission based on data analysis of confirmed cases of the new-type coronavirus pneumonia in China

2020 ◽  
Author(s):  
Peng Chen
Keyword(s):  
Data Analysis ◽  
Numerical Analysis ◽  
Virus Transmission ◽  
Transmission Mechanism ◽  
Chain Reaction ◽  
Republic Of China ◽  
Exponential Law ◽  
New Type ◽  
A Chain ◽  
Single Exponential

This study was based on the numerical analysis on the number of confirmed cases of new-type coronavirus pneumonia in Wuhan announced by the National Health Commission of the People's Republic of China, and the confirmed cases is collected from 15 January to present (30 January). The analysis results show that during this period, the number of confirmed cases increased strictly according to a single exponential law, indicating that the virus transmission showed a chain reaction. The main conclusion is that the spread of the virus is not only a "human-to-human" transmission, but also that the infectious power of each generation has not changed till to 29 Jan, and the number of people infected has increased tenfold in about 6 days, which are much faster than SARS. Furthermore, the rapid increase in the number of cases suggests that the new virus may have some new transmission channels different from SARS. According to these results, it is suggested to concentrate on studying the new-type coronavirus transmission mechanism and take targeted measures to comprehensively stop the virus infection.

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