scholarly journals Numerical Analysis of a Sensorized Prodder for Landmine Detection by Using its Vibrational Characteristics

2019 ◽  
Vol 9 (4) ◽  
pp. 744 ◽  
Author(s):  
Zhiqiang Wu ◽  
Hui Ma ◽  
Chi Wang ◽  
Jinhui Li ◽  
Jun Zhu
Keyword(s):  
Numerical Analysis ◽  
Simulation Experiment ◽  
Landmine Detection ◽  
Burial Depth ◽  
Analysis Method ◽  
Main Resonance ◽  
Coupling System ◽  
Adams Software ◽  
Vibrational Characteristics ◽  
Optimization Function

Prodders are widely used devices in landmine detection. A sensorized prodder has been developed to detect shallow buried landmines by their vibrational characteristics. However, the influencing mechanisms of prodder’s components on the measured vibrational characteristics are not clear, and the vibration intensity of the buried landmine decreases with burial depth. A numerical analysis method is proposed to investigate the effects of parameters of prodder-object coupling system on the measured vibrational characteristics. The calculated main resonance frequency is 109.2 Hz, which corresponds well with the published analogy result of 110 Hz, and the mathematical method is also validated by the previous experimental results. Based on the proposed analysis method, an optimized prodder is designed, whereby the signal strength can theoretically increase 122.78%, which means that a greater depth of detection can be acquired. This optimal design is verified by the simulation experiment that was conducted with the optimization function of Adams software.

Experimental Research and Numerical Analysis on Fiber Reinforced Plasterboard-Reinforced Concrete Composite Floor Slabs

2011 ◽  
Vol 250-253 ◽  
pp. 455-459 ◽  
Author(s):  
Xiao Lin Huan ◽  
Chang Liang Li
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Simulation Experiment ◽  
Strain Curve ◽  
Mechanical Analysis ◽  
Analysis Method ◽  
Fiber Reinforced ◽  
Analysis Model ◽  
Floor Slabs ◽  
Computer Simulation Experiment

Fiber-reinforced plasterboard is patent product which was developed by Rapid Build Structure Ltd. of Australia. Fiber reinforced plasterboard can be used as baseboard , and after casting, it integrate with reinforced concrete to make up fiber reinforced plasterboard-reinforced concrete composite floor slabs. In this paper, numerical analysis method is accepted to analyze the process of bearing the loads of fiber reinforced plasterboard-reinforced concrete composite floor slabs. The calculated results, such as load- section strain curve and bearing capacity are compared with experimental data. Based on the results analysis, a mechanical analysis model is built, which provides some reference basis for computer simulation experiment of this type of structure.

Dynamic Analysis of the Pipe Lifting Mechanism on the Deepwater Pipelaying Vessel

2011 ◽  
Vol 199-200 ◽  
pp. 251-256
Author(s):  
Kai An Yu ◽  
Ke Yu Chen
Keyword(s):  
Numerical Analysis ◽  
Dynamic Analysis ◽  
High Efficiency ◽  
Transport Systems ◽  
Kinematic Pair ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Upper Limit ◽  
Lifting Capacity ◽  
Limit Position

Based on requirements of pipe transport systems on deepwater pipelaying vessel, a new pipe lifting mechanism was designed. It was composed of crank-rocker and rocker-slider mechanism with good lifting capacity and high efficiency. When the slider went to the upper limit position, the mechanism could approximatively dwell, meeting the requirement for transverse conveyor operation. According to the theory of dynamics, numerical analysis method was used to the dynamic analysis of the mechanism. The results showed the maximum counterforce was at the joint between the rocker and ground, and this calculation could be a guideline for the kinematic pair structure designing.

scholarly journals Numerical analysis of stability of an axially-compressed i-beam rod subjected to constrained torsion

2020 ◽  
pp. 11-27
Author(s):  
Amirshokh Kh. Abdurakhmonov
Keyword(s):  
Numerical Analysis ◽  
Axial Force ◽  
Analytical Data ◽  
Practical Interest ◽  
Numerical Calculations ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Open Section ◽  
Thin Walled ◽  
Analysis Of Stability

Introduction. Today thin-walled structures are widely used in the construction industry. The analysis of their rigidity, strength and stability is a relevant task which is of particular practical interest. The article addresses a method for the numerical analysis of stability of an axially-compressed i-beam rod subjected to the axial force and the bimoment. An axially compressed i-beam rod is the subject of the study. Materials and methods. Femap with NX Nastran were chosen as the analysis toolkit. Axially compressed cantilever steel rods having i-beam profiles and different flexibility values were analyzed under the action of the bimoment. The steel class is C245. Analytical data were applied within the framework of the Euler method and the standard method of analysis pursuant to Construction Regulations 16.13330 to determine the numerical analysis method. Results. The results of numerical calculations are presented in geometrically and physically nonlinear settings. The results of numerical calculations of thin-walled open-section rods, exposed to the axial force and the bimoment, are compared with the results of analytical calculations. Conclusions. Given the results of numerical calculations, obtained in geometrically and physically nonlinear settings, recommendations for the choice of a variable density FEM model are provided. The convergence of results is estimated for different diagrams describing the steel behavior. The bearing capacity of compressed cantilever rods, exposed to the bimoment, is estimated for the studied flexibility values beyond the elastic limit. A simplified diagram, describing the steel behaviour pursuant to Construction regulations 16.13330, governing the design of steel structures, is recommended to ensure the due regard for the elastoplastic behaviour of steel. The numerical analysis method, developed for axially-compressed rods, is to be applied to axially-compressed thin-walled open-section rods. National Research Moscow State University is planning to conduct a series of experiments to test the behaviour of axially-compressed i-beams exposed to the bimoment and the axial force. Cantilever i-beams 10B1 will be used in experimental testing.

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