Practical dynamic analysis model of rocking foundations under earthquake excitation

In order to investigate cage stress in tapered roller bearings, a dynamic analysis tool considering both the six degrees of freedom of motion of the rollers and cage and the elastic deformation of the cage was developed. Cage elastic deformation is equipped using a component-mode-synthesis (CMS) method. Contact forces on the elastically deforming surfaces of the cage pocket are calculated at all node points of finite-elements on it. The location and pattern of the boundary points required for the component-mode-synthesis method were examined by comparing cage stresses in a static condition of pocket forces and constraints calculated by using the finite-element and the CMS methods. These results indicated that one boundary point lying at the center on each bar is appropriate for the effective dynamic analysis model focusing on the cage stress, especially at the pocket corners of the cages, which are actually broken. A behavior measurement of a polyamide cage in a tapered roller bearing was conducted for validating the analysis model. It was confirmed in both the experiment and analysis that the cage whirled under a large axial load condition and the cage center oscillated in a small amplitude under a small axial load condition. In the analysis, the authors discussed the four models including elastic bodies having a normal eigenmode of 0, 8 or 22, and rigid-body. There were small differences among the cage center loci of the four models. These two cages having normal eigenmodes of 0 and rigid-body whirled with imperceptible fluctuations. At least approximately 8 normal eigenmodes of cages should be introduced to conduct a more accurate dynamic analysis although the effect of the number of normal eigenmodes on the stresses at the pocket corners was insignificant. From the above, it was concluded to be appropriate to introduce one boundary point lying at the center on each pocket bar of cages and approximately 8 normal eigenmodes to effectively introduce the cage elastic deformations into a dynamic analysis model.

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Android Botnets

Research Anthology on Securing Mobile Technologies and Applications ◽

10.4018/978-1-7998-8545-0.ch005 ◽

2021 ◽

pp. 75-92

Author(s):

Ahmad Karim ◽

Victor Chang ◽

Ahmad Firdaus

Keyword(s):

Dynamic Analysis ◽

High Accuracy ◽

Remote Access ◽

Learning Approaches ◽

Analysis Model ◽

Hybrid Analysis ◽

Static And Dynamic Analysis ◽

Mobile Botnet ◽

Wide Scale ◽

Access Information

Mobile botnets are gaining popularity with the expressive demand of smartphone technologies. Similarly, the majority of mobile botnets are built on a popular open source OS, e.g., Android. A mobile botnet is a network of interconnected smartphone devices intended to expand malicious activities, for example; spam generation, remote access, information theft, etc., on a wide scale. To avoid this growing hazard, various approaches are proposed to detect, highlight and mark mobile malware applications using either static or dynamic analysis. However, few approaches in the literature are discussing mobile botnet in particular. In this article, the authors have proposed a hybrid analysis framework combining static and dynamic analysis as a proof of concept, to highlight and confirm botnet phenomena in Android-based mobile applications. The validation results affirm that machine learning approaches can classify the hybrid analysis model with high accuracy rate (98%) than classifying static or dynamic individually.

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The Dynamic Response of Zhengyangmen Gate Tower Induced by Beijing Metro Line 2

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.1212 ◽

2014 ◽

Vol 580-583 ◽

pp. 1212-1217

Author(s):

Qi Song ◽

Jia Qi Guo ◽

Wen Hua Chen ◽

Ping Guo

Keyword(s):

Dynamic Response ◽

Dynamic Analysis ◽

Test Data ◽

Vibration Test ◽

Analysis Model ◽

Response Characteristics ◽

The North ◽

Cultural Relic ◽

Dynamic Response Characteristics ◽

South Axis

Zhengyangmen gate tower is a national emphasis cultural relic unit along the north-south axis of Beijing, which is above the Beijing metro line 2. Based on dynamic analysis model of gate tower and the position of gate tower and subway, the dynamic response characteristics of gate tower induced by Beijing metro line 2 are calculated, and compared with the in-site vibration test data.

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Multi-Scale Elastoplastic Dynamic Analysis of Steel Frame Welded Connections under Strong Earthquake Excitation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.501-504.1604 ◽

2014 ◽

Vol 501-504 ◽

pp. 1604-1608 ◽

Cited By ~ 1

Author(s):

Er Nian Zhao ◽

Wei Lian Qu

Keyword(s):

Dynamic Analysis ◽

Strong Earthquake ◽

Steel Frame ◽

Plane Section ◽

Scale Model ◽

Determination Method ◽

Contrastive Analysis ◽

Earthquake Excitation ◽

Multi Scale ◽

Flat Section

Multi-scale elastoplastic dynamic analysis of the welded connections is conducted under the strong earthquake excitation based on a steel frame engineering case. Two types of multi-scale model are built for the contrastive analysis, and the plastic deformation of the connection section is extracted to investigate the application of the plane-section assumption. The results indicate that elastic-plastic status makes the column and beam sections not meet the flat section assumption. Finally, the determination method of the refined modeling zone is studied based on the application of the plane-section assumption.

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Dynamic Analysis of Variable Stiffness Bracing System in Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.704.442 ◽

2014 ◽

Vol 704 ◽

pp. 442-446 ◽

Cited By ~ 2

Author(s):

Amir Fateh ◽

Farzad Hejazi ◽

Mohd Saleh Jaafar ◽

Izian Abd. Karim ◽

Azlan bin Adnan

Keyword(s):

Numerical Analysis ◽

Dynamic Analysis ◽

Variable Stiffness ◽

Nonlinear Stiffness ◽

Braced Frames ◽

Earthquake Excitation ◽

Single Degree Of Freedom ◽

Single Degree ◽

Leaf Springs ◽

Bracing System

In this paper, the application of a variable stiffness bracing (VSB) system in structures subjected to earthquake excitation is presented. The considered variable stiffness system is includes of four curve leaf springs. The nonlinear geometry of leaf springs which are acting as bending component lead to nonlinear stiffness performance. The variable stiffness bracing system does not act much for small to intermediate vibration amplitudes but it’s operated to control unpredictably large story displacement. It means this retrofit’s technique avoid an increase force in structural component due to ordinary brace action. The single degree of freedom system (SDOF) is considered and dynamic analysis of aforementioned system, with Bare and normal braced frames are conducted and the results are compared. The efficiency of the proposed system is discussed and proved in light of numerical analysis.

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Study on Dynamics Characteristics of Concrete Floating Slab Track in Urban Track

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.302-303.700 ◽

2006 ◽

Vol 302-303 ◽

pp. 700-705 ◽

Cited By ~ 3

Author(s):

Gao Liang ◽

Ke Ming Yin ◽

Ge Yan Zhang

Keyword(s):

Finite Element ◽

Dynamic Analysis ◽

Dynamic Responses ◽

Finite Element Analyses ◽

Analysis Model ◽

Slab Track ◽

Stiffness And Damping

In this paper, in order to do research on the characteristics of reducing vibration and declining noise of concrete floating slab track, the vertical dynamic analysis model of vehiclefloating slab track is established with the use of finite element analyses method. By using this model, dynamic responses of floating slab track are studied under different conditions of train’s speed, stiffness and damping of infrastructure, structure size, etc. On the basis of this research, some suggestions for design of floating slab track are put forward.

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An Efficient Model for Trust Force Dynamic Analysis in Drilling of CFRP/AL Stack

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.263 ◽

2012 ◽

Vol 249-250 ◽

pp. 263-269

Author(s):

Hui Cheng ◽

Yuan Li ◽

Kai Fu Zhang ◽

Bin Luo

Keyword(s):

Dynamic Analysis ◽

Manufacturing Industry ◽

Thrust Force ◽

Drilling Process ◽

Stage Model ◽

Force Analysis ◽

Analysis Model ◽

Aircraft Manufacturing ◽

Force Components ◽

Cutting Unit

CFRP/AL stacks are widely used in modern aircraft manufacturing industry. Thrust force is the most important element which will cause delamination in the drilling of stack. This paper developed a thrust force dynamic analysis model for drilling of CFRP/AL stack, by firstly, representing the drilling process into a five-stage model. Secondly, the dynamic thrust force is decomposed into two parts (sub models for CFRP and AL drilling). Thirdly, the thrust force components on both tool major cutting edge and chisel edge is developed according to the analysis on infinitesimal cutting unit in both sub models for CFRP and AL drilling. Lastly, several experiments are performed to compare the result of thrust force analysis, which proves that the purposed model can analyze the dynamic thrust force in drilling of CFRP well.

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Capture Process Simulation for a Prone-Cone Microsatellite Docking Mechanism

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.620.411 ◽

2014 ◽

Vol 620 ◽

pp. 411-416

Author(s):

Ye Dai ◽

Rei Dong Ma ◽

Yang Tao Yu ◽

Bao Cheng Xie

Keyword(s):

Dynamic Analysis ◽

Dynamic Characteristic ◽

Process Simulation ◽

Prototype Model ◽

Analysis Model ◽

Characteristic Analysis ◽

Capture Process ◽

Docking Mechanism ◽

Simulation Results ◽

Key Parameter

Focusing on the On-Orbit Servicing technology, a novel automatic autonomous probe-cone docking mechanism used for microsatellite docking is proposed. The structure of this mini docking mechanism is provided, and a virtual prototype model of the mini-type universal docking system is established by using MATLAB software. The simplified dynamic analysis model during the capture process is established. The dynamic characteristic analysis of the capturing process is completed to research the influence of the key parameter, and the simulation results meet the designs demand of mini-type universal autonomous docking mechanism.

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Control Design for Signal Transduction Networks

Bioinformatics and Biology Insights ◽

10.4137/bbi.s2116 ◽

2009 ◽

Vol 3 ◽

pp. BBI.S2116 ◽

Cited By ~ 3

Author(s):

Chun-Liang Lin ◽

Yuan-Wei Liu ◽

Chia-Hua Chuang

Keyword(s):

Signal Transduction ◽

Mathematical Models ◽

Dynamic Analysis ◽

Control Strategy ◽

Controller Design ◽

Control Design ◽

Effective Control ◽

Analysis Model ◽

Signal Transduction Networks ◽

Design Idea

Signal transduction networks of biological systems are highly complex. How to mathematically describe a signal transduction network by systematic approaches to further develop an appropriate and effective control strategy is attractive to control engineers. In this paper, the synergism and saturation system (S-systems) representations are used to describe signal transduction networks and a control design idea is presented. For constructing mathematical models, a cascaded analysis model is first proposed. Dynamic analysis and controller design are simulated and verified.

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