Volume 42,Issue 3,2019 Table of Contents

1 Mapping technique of key quality characteristics based on FMA decomposition

ZHANG Genbao , JIN Chuanxi , RAN Yan , WANG Zhichao

2019, 42(3):1-14. DOI: 10.11835/j.issn.1000-582X.2019.03.001

[Abstract](836) [HTML](465) [PDF 6.00 M](1027)

Abstract:
Based on the FMA structure decomposition of NC machine tool, the coupling and decoupling analysis of the relationships between the main motions were carried out by using the decision making trial and evaluation laboratory (DEMATEL), and the performance coupling matrix of main motions of components was obtained. An indirect mapping relation was introduced to replace the influence of the same generation coupling of main motions on the secondary motion layer; the information coupling degree and coupling variable degree were used to measure the indirect mapping and the direct mapping relationships respectively, and the fuzzy analytic hierarchy process(FAHP) was used to quantify them, thus estalishing the mapping transformation matrix between the main motions and the secondary motions performance, which in combination with the performance coupling matrix of main motions of components, completed the transfer of key quality characteristics in the function-motion layer. The validity and rationality of the mapping method are proved by the comparison of examples.

2 Ventilation characteristics and optimization of solar chimney in underground space

CHEN Zhenghuan , YAO Liping , QIU Zhouhua

2019, 42(3):15-24. DOI: 10.11835/j.issn.1000-582X.2019.03.002

[Abstract](609) [HTML](711) [PDF 2.44 M](977)

Abstract:
To investigate the effect of a solar chimney on the ventilation in a underground space, a dimensionless model was established in this work to numerically analyze internal airflow characteristics and outlet flow regularity of the solar chimney under different Rayleigh number (Ra). A structure optimization measure was proposed to increase the outlet mass flow rate of the chimney. The results indicated that with the increase of Ra, the airflow in the chimney changed from the state of a full outflow to a reverse flow, which occured at the outlet of the chimney when Ra was approximately equal to 10⁶. It was also found that with the increase of Ra, the dimensionless mass flow rate at the outlet increased. But its growth rate decreased when the reverse flow emerged, implying that the reverse flow was one of the important factors affecting the ventilation effect of the underground space. Accordingly, a tilted optimal ventilation structure was put forward.

3 Damage assessment of step-terrace frame structure on the slope under the main-after shock

YANG Youfa , LIANG Ting , TAN Xi

2019, 42(3):25-36. DOI: 10.11835/j.issn.1000-582X.2019.03.003

[Abstract](580) [HTML](376) [PDF 14.00 M](918)

Abstract:
Three structures with different layers and crosses and an ordinary flat frame structure were designed with reference to the current norms of China. Taking the Park-Ang damage index as the parameter of structural response, and peak ground a cceleration (PGA) as the parameter of the ground motion intensity and considering the additional effects of aftershocks, damage assessment of the layered structure was carried out by the incremental dynamic analysis in rspects of the additional damage index, the layer damage index and the overall damage index. The results show that the main shock is the most important factor causing structural damage. The damage of the upper ground layer is the most serious, the additional damage index of the components of the layer structure increases, and the additional damage of the upper grounding column is the largest. The global damage of the layered structure on the slop is greater than that of ordinary flat structure, the damage index ratio decreases in turn according to C2K3、C3K2、C2K2 and ORD.

4 Restoring force model of SCFST column braced frame

ZHAO Bingzhen , CHEN Zhihua , CHEN Xiandong , WU Yapeng , LEI Zhiyong , LAN Shu

2019, 42(3):37-49. DOI: 10.11835/j.issn.1000-582X.2019.03.004

[Abstract](627) [HTML](598) [PDF 20.01 M](977)

Abstract:
Special-shaped column composed of concrete-filled square steel tubes(the SCFST column) braced frame has broad prospects of applications in high-rise steel structure residence for the reason that it represents considerable lateral stiffness, good seismic performance and outstanding architecture effect. Quasi-static tests were conducted to explore the seismic behavior mechanism, and beams and columns were destroyed in turn. The hysteretic curves of the structure were diamond-shaped with no pinch phenomenon, which illustrated that the structure performed well in energy dissipation. The structure had good ductility and seismic behavior in that the skeleton curve declined slowly. The finite element (FE) numerical simulation agreed well with the experimental result, verifying the correctness of the FE model. The restoring force model of the SCFST column-steel beam braced frame took axial compression ratio, the section of the column and the stiffness of the brace as main research factors. By linear regression analysis, the trilinear skeleton model was established which showed the hysteretic behavior and stiffness degradation of the SCFST column braced frame. As seen by from the comparison of the results of the model with those of the experiment, the skeleton curves of the model and the experiment were nearly the same, both of the hysteretic curves were in the shape of a parallelogram,and the anastomosis degree was high. In conclusions the restoring force model is an effective way to simulate the behavior of the frame and it can present the load displacement curve of the SCFST column braced frame under low reversed cyclic loading.

5 Analysis of human blood circulation with lymph microcirculation

LI Mingyang , ZHAO Liangju , CAI Xiao , XU Ke

2019, 42(3):50-57. DOI: 10.11835/j.issn.1000-582X.2019.03.005

[Abstract](691) [HTML](360) [PDF 1.46 M](997)

Abstract:
We built a fluid network model of human blood circulation with lymphatic system based on fluid network dynamics and circuit graph theory, and used first 10 harmonios waves to simulate the blood flow equation. In hemodynamics respect, the effect of lymph branch on systemic circulation and mutual influences of every branch were simulated by changing the branches resistance in the model. Hemodynamics parameters were obtained by average method of adaptive control, and the biophysical effect of the lymphatic system on microcirculation was discussed. The results show that, when lymphatic microcirculation has a disorder, and lymph branch flow resistance ratio is η=3, the average flow of this branch is decreased by 42.24%, and the relative decrease in the awerage flow of other branches in not more than 0.04%. The changes in the flow resistance of other branches will lead to a decrease by at least 2.69% of the lymphatic branch flow. This study provides reference for analysis of microcirculation disorder and the relation between systemic circulation and microcirculation.

6 Research on optimization of feature selection algorithm based on neighborhood preservation criterion

LIU Yun , XIAO Xue

2019, 42(3):58-64. DOI: 10.11835/j.issn.1000-582X.2019.03.006

[Abstract](567) [HTML](471) [PDF 3.20 M](774)

Abstract:
The application of feature selection to deal with "Dimensional Disaster" in multi-label data classification has become an important research direction, we proposed a feature selection algorithm based on neighborhood preservation criterion (NPFS). A similarity preservation expression was constructed by approximating two similarity matrices based on feature subspace and label space. Then, the similarity preservation formulation was extended by the linear approximation to obtain a formulation of the neighborhood relationship preservation, and the importance of the feature subset was evaluated by calculating the neighborhood relationship preserving score (NRPS).A multi-label feature selection algorithm with NRPS was designed in combination with the greedy method(NPFS).The simulation results show that the metrics of average precision, coverage, hamming loss, one-error, ranking loss obtained by the proposed algorithm have been improved compared with those obtained by MMIFS algorithm and MDMR algorithm.

7 Comprehensive Fault Diagnosis Method for Jointless Track Circuit Based on Fuzzy Qualitative Trend Analysis

ZHANG Youpeng , ZHU Taowei , ZHAO Bin

2019, 42(3):65-75. DOI: 10.11835/j.issn.1000-582X.2019.03.007

[Abstract](682) [HTML](419) [PDF 9.77 M](950)

Abstract:
In this paper, the method of comprehensive fault diagnosis based on fuzzy qualitative trend analysis is presented to address the problem of incompatibility of detection methods for JTC compensation capacitor and tuning area, realizing comprehensive fault diagnosis of JTC including compensation capacitor and tuning equipment. A simulation model of JTC compensation capacitor and tuning equipment faults was established based on the transmission line theory. The signal curve trends of JTC fault-free, and the compensation capacitor and tuning equipment at fault were extracted respectively according to the divided point of compensation capacitor position, with which a knowledge base was built. the matching degree between an actual signal and the classical failure mode in knowledge base according to the matching degree formula defined in this paper. Finally, the diagnosis result was given. Experiments shows that the higher the SNR(Signal Noise Ratio) is, the higher the diagnostic accuracy is. The diagnostic accuracy is as high as 94.9% when the SNR is 50 dB and corresponding ballast resistance is 1 Ω·km. The proposed method has a higher flexibility and applicability compared with the simulated annealing algorithm.

8 Fusion Inertial Navigation Location Algorithm for MT2503 Chip and MEMS Sensors

WANG Chao

2019, 42(3):76-84. DOI: 10.11835/j.issn.1000-582X.2019.03.008

[Abstract](739) [HTML](754) [PDF 5.96 M](979)

Abstract:
A fusion inertial navigation location algorithm for MT2503 and MEMS sensors is presented to improve accuracy and continuity. MT2503 chip is the locating terminal of location algorithm which blends accelerometer sensors, gyroscopes, magnetometers, and other sensors. Accelerometer sensors are used to resolve step size, stride and stride frequency. Gyroscopes and magnetometers are used to recognize the offset of a locating terminal. Finally, an offset of the location terminal is added on the original location to obtain the real time location of the locating terminal. Experiments confirmed that the problem of accumulative errors in navigation solution of the MEMS location algorithm is solved well through zero velocity update and Kalman filter. The method improves the accuracy of indoor inertial navigation positioning algorithm based on MEMS sensors.

9 Facial expression recognition algorithm based on improved local direction pattern

LUO Yuan , YU Chaojing , ZHANG Yi , LIU Lang

2019, 42(3):85-91. DOI: 10.11835/j.issn.1000-582X.2019.03.009

[Abstract](774) [HTML](330) [PDF 1.91 M](1198)

Abstract:
The local directional pattern (LDP) descriptor is a method for texture feature extraction. It calculates and sorts edge response values of eight different directions, thus the speed is slower than other local texture feature extraction algorithm. This paper presents a new feature descriptor called divided local directional pattern (DLDP) for feature extraction. In this method, Kirsch masks in eight different orientations were divided into two sub-directional masks. The edge response values were calculated respectively to obtain DLDP1 and DLDP2. DLDP1 and DLDP2 were concatenated into a single DLDP descriptor. Then principal component analysis (PCA) was used for dimensionality reduction processing. Finally, the support vector machine (SVM) was applied to classify and recognize facial expression. The experimental results show that compared with the better feature extraction algorithms in recent years, the improved local direction pattern can not only reduce the computation time, but also improve the rate of facial expression recognition.

10 A method of time series piecewise linearization based on tendency

LIN Yi , ZHU Zhijing

2019, 42(3):92-98. DOI: 10.11835/j.issn.1000-582X.2019.03.010

[Abstract](886) [HTML](725) [PDF 3.82 M](1206)

Abstract:
The geometric form of upward and downward trends in time series was studied by analyzing the geometric characteristics of time series. Concepts of high or low filtering points and high or low filtering lines were proposed according to the variation characteristics of time series. These concepts were used to judge the upward trends and the downward trends of the time series. Furthermore, a piecewise linear representation of time series based on upward or downward property was proposed. The results of experiments show that this method is easy to be programmed. It has desirable approximation, runs fast, and keeps the shape of time series. Furthermore, the number of lines is small.

11 Task assignment optimization method of getting shortest project duration for engineering project with capital limit under mixed work calendars

ZENG Qiang , WANG Menghua , YUAN Mingming , ZHANG Jinchun

2019, 42(3):99-116. DOI: 10.11835/j.issn.1000-582X.2019.03.011

[Abstract](650) [HTML](291) [PDF 1.72 M](902)

Abstract:
This paper presents an optimization method using a genetic algorithm to solve the task assignment problem of achieving the shortest project duration for an engineering project with capital limit under mixed work calendars. Firstly, the problem was described. Then, a genetic algorithm was designed to solve the researched problem. A time reckoning mechanism based on the contractor's work calendar was proposed and related time reckoning functions were designed as the basis of calculating project duration for an engineering project under mixed work calendars. An integer coding method based on contract number was used to encode the chromosome. The refusal strategy was used in the population initialization to ensure the feasibility of chromosomes. To ensure the feasibility of offspring chromosomes, an improved crossover operator was used in the crossover operation based on the two-point crossover method, and a refusal strategy was used in the mutation operation based on the single-point mutation method. Finally based on the critical path method, the forward reckoning function FC was used to get the shortest project duration. The effectiveness of the proposed method was verified by a case study.

12 Theoretical and experimental study on impact recovery coefficient of metal particles and electrodes

ZHANG Dehong , DAI Yanxia

2019, 42(3):117-124. DOI: 10.11835/j.issn.1000-582X.2019.03.012

[Abstract](777) [HTML](392) [PDF 1.55 M](1056)

Abstract:
Metal particles are one of the key factors in the insulation strength reduction of gas insulated transmission lines (GIL). The study of the impact recovery coefficient of metal particles and electrodes can provide a theoretical basis for the suppression of metal particles. Based on the elastoplastic deformation theory, the formula of the normal recovery coefficient and the tangential recovery coefficient were derived in this work. The effects of particle material properties, particle diameter and collision velocity on the impact recovery coefficient were studied by the collision recovery coefficient measurement platform. The experimental results verify the reliability of the theoretical calculation formula. The theoretical calculations and experimental measurements show that according to the order of metal aluminum, copper and steel, the normal impact recovery coefficient gradually decreases, while the tangential impact recovery coefficient gradually increases. Both the normal impact recovery coefficient and the tangential impact recovery coefficient are negatively correlated with the particle diameter. Besides, under the same oblique impact angle, the normal impact recovery coefficient decreases with the increase of the collision velocity, but the tangential impact recovery coefficient decreases first and then increases with the increase of collision velocity, and the variations of normal or tangential restitution coefficients under different oblique impact angles are similar. The calculation method of collision recovery coefficient can provide theoretical support for engineering design of particle traps.

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