The Study on the Dynamic Response of Cylindrical Pressure Hull on the Different Shock Loading Empirical Formula

2015 ◽  
Vol 799-800 ◽  
pp. 604-609 ◽  
Author(s):  
Ching Yu Hsu ◽  
Tso Liang Teng ◽  
Cho Chung Liang ◽  
Hai Anh Nguyen ◽  
Chien Jong Shih
Keyword(s):  
Dynamic Response ◽  
Empirical Formula ◽  
Shock Loading ◽  
Failure Modes ◽  
Underwater Explosion ◽  
The Other ◽  
Empirical Formulas ◽  
Underwater Shock ◽  
Simulation Results ◽  
Better Than

This paper focuses on the comparison between underwater explosion (UNDEX) shock loading empirical formulations. First, the numerical simulations for a cylindrical pressure hull subjected to UNDEX loading were conducted and the results are close to the failure modes shown in experiments of Kwon (1993). Second, the empirical UNDEX loading formula of Cole (1948), Keil (1961) and Shin (1994) used in cylinder subjected to underwater shock loading were compared. The simulation results by using three empirical formulas were compared and Shin’s (or Cole’s) empirical formula was shown to be better than the other empirical formulations when subjected to an UNDEX under the same conditions. The analytical results offer a valuable reference to the research of underwater explosion.

Simulation on Effect of Five Kinds of Belt Structures on Tire Performance

2012 ◽  
Vol 501 ◽  
pp. 151-155
Author(s):  
Yong Liu ◽  
Ge Zhang ◽  
Hua Yan ◽  
Yu Mei Ding ◽  
Wei Min Yang
Keyword(s):  
The Other ◽  
Molding Process ◽  
Simulation Results ◽  
Better Than

In this article, three kinds of belt named B, C and D type are invented, then their main performance are compared with the other two kinds of belt structures introduced in previous papers. Simulation results showed that B and D-type belts are better than the other three. Comparatively the latter needs less material, its molding process is easier, and the tire body is lighter than B type tire, so in general it can be considered that D-type belt is the best among the five kinds of belt structures.

Research on a Dynamic Binary Stack Anti-Collision Algorithm

2012 ◽  
Vol 268-270 ◽  
pp. 1426-1431
Author(s):  
Jian Jun Yi ◽  
Fei Luo ◽  
Shao Li Chen ◽  
Bai Yang Ji ◽  
Hai Xu Yan
Keyword(s):  
The Other ◽  
Application System ◽  
Key Technology ◽  
Rfid Systems ◽  
Simulation Results ◽  
Better Than ◽  
Improved Algorithm

RFID anti-collision technology is one of a key technology in RFID application system. Anti-collision algorithms for RFID systems include tag anti-collision algorithms and reader anti-collision algorithms. This paper focused on the impoved binary algorithm and dynamic binary algorithm. An improved algorithm has been proposed, in which the collision bits was put into the stack and they were used as the reader’s request. Based on this mechanism, a novel binary stack algorithm has been proposed. Its simulation was given to analyze the performance of this algorithm. The simulation results showed that the amount of transmitted data in proposed algorithm was obviously less than those in the other two traditional algorithms with the number of tags and their bytes increasing. Consequently, the performance of the proposed algorithm is much better than that of the traditional anti-collision binary algorithm.

scholarly journals RESEARCH ON SHEAR PERFORMANCE OF COMPONENTS CONNECTED BY BEECH AND SELF-TAPPING SCREW COMPOSITE DOWELS

Wood Research ◽  
2021 ◽  
Vol 66 (6) ◽  
pp. 955-968
Author(s):  
XUDONG ZHU ◽  
YINGYING XUE ◽  
XUEWEN ZHANG ◽  
PENGFEI QI ◽  
JIE SHEN ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Linear Equation ◽  
Failure Modes ◽  
Maximum Load ◽  
The Other ◽  
Test Results ◽  
Other Hand ◽  
Shear Performance ◽  
Group B ◽  
Better Than

This study examined the properties of components connected by beech and self-tapping screw composite dowels (group C). As a contrast, the components connected by beech dowels and self-tapping screws individually were tested. The test results indicated that the properties of the components connected by beech dowels (group B) were better than those connected by self-tapping screws (group S), except the ductility coefficient, final displacement, and energy consumption. On the other hand, the main failure modes of groups B and S were the broken beech dowel and the bent self-tapping screw, respectively. For group C, two peak values could be found which were larger than the maximum load of groups B and S, respectively. The properties of group C were better than those of groups B and S, except that the final displacement and energy consumption were located between those of groups B and S. Meanwhile, the linear equation in two unknowns have be found between groups B, S and C.

Basic Study on the Crushing of Frozen Soil by Shock Loading

2007 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Masahiko Otsuka ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
High Speed ◽  
Shock Loading ◽  
Underwater Explosion ◽  
Frozen Soil ◽  
High Speed Camera ◽  
Underwater Shock Wave ◽  
Basic Study ◽  
Underwater Shock ◽  
A New Technique

The aim of study is to confirm a new technique that can crush the frozen soil and/or ice block using underwater shock wave generated by the underwater explosion of explosive. This technique can lead to the earlier sowing, which can have the larger harvest because the duration of sunshine increases. Especially, in Hokkaido prefecture, Japan, if the sowing is carried out in April, we can expect to have 150% of harvest in the ordinary season. This technique is effective against the cold regions. For example, Korea, China, Mongolia, Russia, Norway, and Sweden, etc. At first, we carried out experiments usung a detonating fuse and ice block. The process of ice breaking was observed by means of a high-speed camera. In order to check about that influence we tried to give an actual frozen soil a shock wave.

Performance Evaluation of Different Backoff Algorithms in IEEE 802.15.4 using Double Sensing

2017 ◽  
Vol 5 (2) ◽  
pp. 376
Author(s):  
Md. Mohibur Rahaman ◽  
Mohammad Khairul Islam ◽  
Kazi Ashrafuzzaman ◽  
Mohammad Sanaullah Chowdhury
Keyword(s):  
Performance Evaluation ◽  
Ieee 802.15.4 ◽  
The Other ◽  
Area Network ◽  
Exponential Increase ◽  
Exponential Decrease ◽  
Simulation Results ◽  
Personal Area Network ◽  
Low Rate ◽  
Better Than

<p>The IEEE 802.15.4 is the standard for Low Rate Wireless Personal Area network (LR-WPAN). It is widely used in many application areas. The standard uses Slotted CSMA/CA mechanism in its contention access period (CAP) for the beacon enabled mode. The protocol has two modes - single sensing (SS) and double sensing (DS). The protocol also adopts a binary exponential backoff (BEB) algorithm. In this paper, we explore the saturation throughput, delay and energy consumption of this standard with double sensing (DS) using the existing BEB algorithm. We also investigate three other backoff schemes - exponential increase exponential decrease (EIED), exponential increase linear decrease (EILD) and exponential increase multiplicative decrease (EIMD). From simulation results, it is found that the EIED, EILD, EIMD perform better than the BEB for higher loads. It shows that the EIED, EILD, EIMD have better throughput and lower delay than the BEB. The EIED outperforms the other schemes in terms of throughput, delay and energy for the higher loads.</p>

FE Analysis of Ship Structures Under Blast Loads

2008 ◽  
Author(s):  
Satyaranjan Sinha ◽  
D. G. Sarangdhar
Keyword(s):  
Solution Process ◽  
Mechanical Damage ◽  
Underwater Explosion ◽  
Time History ◽  
Complex Loading ◽  
Large Structure ◽  
Empirical Formulas ◽  
Load Calculation ◽  
Underwater Shock ◽  
Shock Simulation

Naval vessels and Submarines structures in their fighting role are susceptible to Underwater shock generated due to explosion of torpedoes, mines, depth charges etc. The damage inflicted by Non-Contact Underwater explosion consists of direct shock wave damage of hull, whipping damage of keel and mechanical damage to onboard equipment and associated systems. Hence in order to design a shock resistant structure or to know the shock withstandibility of the same, it is important to simulate these structures and loads and then subsequently analyze the same to predict the response (as performing experiments would be expensive). The Underwater explosion analysis of large structures like ships could be considered as one of the most complicated numerical analysis. The most important steps of these analyses are, the accurate load calculation and then the solution process. Loads can be calculated using published empirical formulas, which are complicated if calculated for a large structure. Also the application of load time history for large structure is a tedious job. To solve the complications related to load calculation and application, an in-house software named IRUNDEX, was developed, which, not only calculates the complex loading at all panels comprising the ship structure, but could also apply the loads (using ANSYS Macro) within minutes, thus saving considerable percentage of time taken for the analysis. It could be recognized that underwater shock simulation and analysis should form an important criterion to verify the design of any Naval Vessel or structure susceptible to explosions. This present work illustrates the use of the FE Software ANSYS, backed up with the in-house developed software, for Underwater Explosion analysis of structures.

The Comparison among Three Control Charts for Monitoring the Auto Correlated Processes

2014 ◽  
Vol 490-491 ◽  
pp. 1579-1583
Author(s):  
Ming Jie Yang ◽  
Xue Min Zi
Keyword(s):  
Control Chart ◽  
Control Charts ◽  
The Other ◽  
First Order ◽  
Regressive Model ◽  
Auto Regressive ◽  
The Mean ◽  
Simulation Results ◽  
Auto Regressive Model ◽  
Better Than

We compare the ARL of three charts for monitoring the mean shifts of the first-order auto regressive model to choose a proper control chart. Simulation results show that the REWMA chart has a large superior to the EWMA and T2 the chart when -1<Ø<0, but when Ø>0, the chart is better than the other two charts.

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