Inhomogeneous bonding state modeling for vibration analysis of explosive clad pipe

Jianbin Cao,Zhousuo Zhang,Yanfei Guo,Teng Gong 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.3

Early detection of damage bonding state such as insufficient bonding strength and interface partial contact defect for the explosive clad pipe is crucial in order to avoid sudden failure and even catastrophic accidents. A generalized and efficient model of the explosive clad pipe can reveal the relationship between bonding state and vibration characteristics, and provide foundations and priory knowledge for bonding state detection by signal processing technique. In this paper, the slender explosive clad pipe is regarded as two parallel elastic beams continuously joined by an elastic layer, and the elastic layer is capable to describe the non-uniform bonding state. By taking the characteristic beam modal functions as the admissible functions, the Rayleigh-Ritz method is employed to derive the dynamic model which enables one to consider inhomogeneous system and any boundary conditions. Then, the proposed model is validated by both numerical results and experiment. Parametric studies are carried out to investigate the effects of bonding strength and the length of partial contact defect on the natural frequency and forced response of the explosive clad pipe. A potential method for identifying the bonding quality of the explosive clad pipe is also discussed in this paper.

A novel CCU approach of CO2 by the system 1,2-ethylenediamine+1,2-ethylene glycol

Jianbin Zhang,Bo Guo,Tianxiang Zhao,Feng Sha,Fei Zhang,Qiang Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6

As a new, effective CO2 fixation system, 1,2-ethylenediamine and 1,2-ethylene glycol (EDA+EG) can efficiently activate CO2 and directly convert it into a novel CO2-storage material (CO2SM) with 46.3% yield. The aqueous CO2SM solution can react with Ca(OH)2-saturated limpid solution to generate morphology-controllable CaCO3 microparticles with additional CO2 bubbling and Ca(OH)2. Additionally, the aqueous EDA+EG solution could be recycled multiple times without significant loss of CO2 capturing and releasing capabilities.

Characterization of high-alumina coal fly ash based silicate material and its adsorption performance to CO2

Jianbin Zhang,Yinan Yan,Yajun Gao,Wenjing Tang,Qiang Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4

Silicate material prepared from high-alumina coal fly ash (HACFA) was characterized by using XRD, SEM, FTIR spectroscopy, TGA-DSC, and elemental analysis. These spectral results show that the silicate material is mainly composed of eight elements--O, C, Si, Ca, Na, Mg, Al, and Fe, which exist as the formations of Ca2+, Na+, Mg2+, Al3+, Fe3+, SiO3 2−, and CO3 2−, and some adsorbed water and crystal water are determined in the silicate material. The material with surface area of 117.12m2/g shows a faveolate structure, and a pore size distribution of silicate material is calculated at 11.01 nm from the nitrogen desorption isotherm using the BJH model. When the material was used for CO2 adsorption at T=323.15 K and flow rate=95mL/min with 15.79% (vol) CO2, a dynamic adsorption capacity of CO2 on the surface of silicate material was found at 8.67mg/g and the adsorption values decreased weakly after seventeen recycling times. The investigation of dynamic adsorption behavior shows that the silicate material presents similar adsorption properties with commercial active carbon and stronger adsorption properties than commercial diatomite.

A Fast and Robust Algorithm for Fighting Behavior Detection Based on Motion Vectors

( Jianbin Xie ),( Tong Liu ),( Wei Yan ),( Peiqin Li ),( Zhaowen Zhuang ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.11

In this paper, we propose a fast and robust algorithm for fighting behavior detection based on Motion Vectors (MV), in order to solve the problem of low speed and weak robustness in traditional fighting behavior detection. Firstly, we analyze the characteristics of fighting scenes and activities, and then use motion estimation algorithm based on block-matching to calculate MV of motion regions. Secondly, we extract features from magnitudes and directions of MV, and normalize these features by using Joint Gaussian Membership Function, and then fuse these features by using weighted arithmetic average method. Finally, we present the conception of Average Maximum Violence Index (AMVI) to judge the fighting behavior in surveillance scenes. Experiments show that the new algorithm achieves high speed and strong robustness for fighting behavior detection in surveillance scenes.

Joint Template Matching Algorithm for Associated Multi-object Detection

( Jianbin Xie ),( Tong Liu ),( Zhangyong Chen ),( Zhaowen Zhuang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.1

A joint template matching algorithm is proposed in this paper to reduce the high rate of miss-detection and false-alarm caused by the traditional template matching algorithm during the process of multi-object detection. The proposed algorithm can reduce the influence on each object by matching all objects together according to the correlation information among different objects. Moreover, the rate of miss-detection and false-alarm in the process of single-template matching is also reduced based on the algorithm. In this paper, firstly, joint template is created from the information of relative positions among different objects. Then, matching criterion according to normalized cross correlation is generated for multi-object matching. Finally, the proposed algorithm is applied to the detection of watermarks in bill. The experiments show that the proposed algorithm has lower miss-detection and false-alarm rate comparing to the traditional NCC algorithm during the process of multi-object detection.

Finite element analysis and mathematical characterization of contact pressure distribution in bolted joints

Jianbin Cao,Zhousuo Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10

Quantitative characterization of contact pressure distribution in bolted joints directly influences the calculation accuracy of connection stiffness. In this paper, a three-dimensional finite element model of the bolted joints is established using the software ANSYS, and pretension force and contact between the joint components are accommodated in the model. Then, parametric studies are carried out to investigate the effects of the material properties, preloads, bolt sizes, grip lengths and hole clearances on the contact pressure distribution. According to the finite element analysis results, a polynomial equation system is derived for mathematical representation of contact pressure distribution in bolted joints. Furthermore, the conical envelope angle used in the mathematical characterization is identified for the bolted joints with different bolt sizes and grip lengths. Finally, an experimental platform is constructed for the measurement of contact pressure distribution, and then the applicability of mathematical characterization is validated by comparison with a series of experiment results.

Non uniform virtual material modeling on contact interface of assembly structure with bolted joints

Jianbin Cao,Zhousuo Zhang,Wenzhan Yang,Yanfei Guo 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.5

Accurate modeling of contact interface in bolted joints is crucial in predicting the dynamic behavior for bolted assemblies under external load. This paper presents a contact pressure distribution based non-uniform virtual material method to describe the joint interface of assembly structure, which is connected by sparsely distributed multi-bolts. Firstly, the contact pressure distribution of bolted joints is obtained by the nonlinear static analysis in the finite element software ANSYS. The contact surface around bolt hole is divided into several sub-layers, and contact pressure in each sub-layer is thought to be evenly. Then, considering multi-asperity contact at the micro perspective, the relationship between contact pressure and interfacial virtual material parameters for each sub-layer is established by using the fractal contact theory. Finally, an experimental platform for the dynamic characteristics testing of a beam lap structure with double-bolted joint is constructed to validate the efficiency of proposed method. It is found that the theoretical results are in good agreement with experimental results by impact response in both time- and frequency-domain, and the relative errors of the first four natural frequencies are less than 1%. Furthermore, the presented model is used to examine the effect of rough contact surface on dynamic characteristics of bolted joint.

The Impacts of Yoga Class on Mood State of Univsity Male Students Who Major in Sports Training

( Jianbin Li ),( Hao Wu ),( Xiaotang Zhao ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: Yoga is originated in India 5000 years ago, until now it has become heated among global sports education. Related researches about the impacts of Yoga practice on mood state of university male students who major in sports training still do not come to light .This research tries to explore the impacts of Yoga practice on mood state of university male students who major in sports training, and to provide further refercences for Yoga teaching and scientific data for mechanism of scientific fitness according to teaching practice. Method: This research selects 96 male university students who major in sports training from class 1 to 6 in grade 2005 who take Yoga as selective course, and applies BFS Mood Survy before and after the 14th class.There are conventional teaching of 8 minutes of breath regulation, about 55 minutes of 6 body positions practice and 15minutes of supine relax in the 14th class. The BFS Mood Suvery can measure students` before and after class feelings from different levels of activeness, happiness, anger, calm, etc, based on its function of evaluation and activation, and this research uses Likert scale to evaluate final suvey answers. Result: 88 testees` data get into final result analysis and all data are put into SPSS statistic software to measure, which shows data reliability reaches 95%. The difference between before and after Yoga class is outstanding―activeness, happiness, calm, angern, excitability, depression, inactiveness, P=0.00. The experiment shows that before the class, the activeness separate survy average score is 14.68, and after Yoga class it is 16.85, which increses 14.8%. Yoga can help testees unconsciously become more energetic and remove their tension, to increse their self-confidence. Conclusion: Yoga class has great impacts on male students who major in sports training, such as helps them get more energy, relese their nervousness, avoid anger and depressed passive emotions, finally to become more confident. University male students who major in sports training can choose "body position"and "breath regulation"as the main learning contents. It is suggested that students need to choose those body positions which can do good to cardiac muscle, lung, liver and other organs, and also can effectively stimulate and balance glands of each body part, to promote the firmness and stretch of joints and ligaments. It is a recommendation that using affirmative words to remind during the teaching and it is important for students to form posive self-suggestion while practice.

Turbo Product Codes Decoding Algorithm with Weighted HIHO for Energy-efficient Wireless Sensor Network

Jianbin Yao,Jianhua Liu,Yang Yang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5

Complexity and energy-efficiency are viewed as two main factors of design error correct coding for the wireless sensor networks. First of all, this paper presents a Weighted Hard-Input Hard-Output (WHIHO) iterative decoding algorithm with the low complexity when the required bit error rate (BER) is satisfied for wireless sensor nodes. A reliability matrix from four different aspects of the decoding process, properly weighs and combines their respective reliability measures, and then employs the combined measure to make a judgment with regard to whether each received bit is correct or not. Next, the energy efficiencies of turbo product codes using HIHO and WHIHO decoding algorithm are analyzed. Simulation results in a BER curve indicating that the WHIHO decoding algorithm can achieve a better tradeoff between reliability and complexity, which compared with conventional HIHO and soft-input and soft-output (SISO) decoding algorithms. The simplicity and effectiveness of WHIHO decoding algorithm makes it a promising candidate for the application for wireless sensor network.

Experimental solubility and absorption mechanism of dilute SO2 in aqueous diethylene glycol dimethyl ether solution

Jianbin Zhang,Xiong-hui Wei,Qiuxia Xu,Jianbai Xiao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12

SO2 absorption capabilities of DEGDME+H2O system with different compositions were systemically investigated. The DEGDME+H2O system exhibited superior SO2 absorption capability and optimal desorption property with a desorption rate of higher than 94% under the desorption conditions. In addition, it has been demonstrated that the DEGDME+H2O system possessed remarkable SO2 absorbing and releasing capability after multiple recycles. Moreover, GLE data were measured for dilute SO2 in the system of DEGDME+H2O, in which SO2 partial pressures were determined in the range of 0 to 140 Pa. By fitting of GLE data, HLC, ΔH, ΔS and ΔG of SO2 absorption process were obtained. UV, FTIR, 1H-NMR, and 13C-NMR spectra of absorbing systems in the SO2 absorption processes were studied to elucidate the absorption mechanism. On the basis of the spectral results, the intermolecular hydrogen bonding and S…O interaction between SO2 with the absorption system were discussed.