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20 March 2019, Volume 38 Issue 03 Previous Issue    Next Issue
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Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment
Traffic & Transportation Engineering
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Bridge & Tunnel Engineering

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Control Technology of Non-uniform Shrinkage of PC Box-Girder Bridges HUANG Haidong1, HOU Xu2 2019, 38(03): 1-8.  DOI: 10.3969/j.issn.1674-0696.2019.03.01 Abstract ( )   PDF (1001KB) ( )   Non-uniform shrinkage of concrete box-girder cross-section has remarkable effect on the long-term structure behavior, which hasnt been solved till now. Based on the mechanism of drying shrinkage deformation of concrete and the characteristics of long-term shrinkage deformation of long-span PC box girder bridges, a new idea to control the long-term non-uniform shrinkage deformation of PC box girder bridges by setting a sealing coating on the surface of the structure was proposed. The rationality and reliability of the proposed method was verified by model test, in which factors such as the shape size of the structure, the water-cement ratio of concrete and the way of sealing coating were considered comprehensively. Taking the Jiangjin Yangtze River Bridge as an example, the test design of sealing coating was carried out, and the sensitivity analysis of environmental humidity, painting time and other parameters was carried out. The analysis results show that the drying shrinkage deformation can be effectively reduced and the direction of structural shrinkage and flexure deformation can be controlled by setting a sealing coating on the surface of box girder. References | Related Articles | Metrics

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Rebar Retraction Probability Distribution Model of Prestressed Clip Anchor FAN Jianwei1, ZHANG Feng2, GAO Lei2, WANG Dawei2, GAO Huarui2 2019, 38(03): 9-13.  DOI: 10.3969/j.issn.1674-0696.2019.03.02 Abstract ( )   PDF (856KB) ( )   Excessive rebar retraction is an important reason for the loss of prestressing force in post-tensioned reinforced concrete beams.The simplified method and accurate method of rebar retraction were put forward. The probability distribution statistics of 233 groups of test data were carried out, and the distribution hypotheses of probability model of 3 kinds of rebar retraction were put forward. The various distribution hypotheses were tested by Kolmogorov test method respectively.The results show that the retraction of clip is less than that of strand, and the relative displacement of clip and strand occurs.Simply calculating the retraction of steel bar through the retraction of clip will result in smaller test results.In practical engineering, the rebar retraction exceeds the standard, and the excessive depth of groove of limit plate is an important reason for the excessive rebar retraction.The rebar retraction obeys normal distribution.Based on this, the proposed normal distribution probability model of rebar retraction provides a favorable basis for the evaluation of actual rebar retraction and prestress loss caused by rebar retraction.The associated model of the simplified method and accurate method of rebar retraction can be used for quantitative assessment of rebar retraction amount in practical engineering. References | Related Articles | Metrics

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Landscape and Sightseeing —— Space Creation of Urban River-Crossing Bridges LAI Yaping1, LONG Hao2 2019, 38(03): 14-20.  DOI: 10.3969/j.issn.1674-0696.2019.03.03 Abstract ( )   PDF (5339KB) ( )   Space creation of river-crossing bridges and urban riverside space adjacent to them were studied as a closely related whole. The spatial composition and landscape features of river-crossing bridges were analyzed. It was proposed that bridgehead space could be constructed by integrating space resources around bridgehead, constructing places for leisure, sports and cultural entertainment and extending urban leisure space. Bridge deck space can be created by improving the comfort of pedestrian crossing bridges, creating complex and diverse residential and sightseeing functions. Through optimizing the space form under the bridge and improving the lighting environment, the greening configuration was used to create the space under the bridge, in order to provide meaningful reference for the future landscape planning and design of river-crossing bridges. References | Related Articles | Metrics

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Apparent Tunnel Diseases Identification Based on Digital Images HE Guohua1, LIU Xingen2, 3, CHEN Yingying2, 3, YANG Jun1, ZHONG Bei2, 3 2019, 38(03): 21-26.  DOI: 10.3969/j.issn.1674-0696.2019.03.04 Abstract ( )   PDF (1495KB) ( )   The principle of image acquisition of fast detection vehicle for highway tunnel structure was expounded. Aiming at the apparent image of tunnel structure, the image characteristics of tunnel cracks and seepage diseases were systematically analyzed. Based on the characteristics of fracture image, cracks can be accurately identified by combining CTA measurement algorithm with edge detection. According to the characteristics of seepage image, the improved CTA algorithm and morphological processing method can be used to identify and locate the seepage of tunnel structure. The experiment results show that: apparent diseases can be identified effectively by using CTA measure and its improved algorithm, which can effectively reduce the influence of cable interference and illumination change. References | Related Articles | Metrics

Highway & Railway Engineering

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An Iterative Algorithm of Nonlinear Total Least Squares for Calculating Road Circular Curve Parameter HU Chuan, DENG Mingjing, ZHAO Lidu 2019, 38(03): 27-31.  DOI: 10.3969/j.issn.1674-0696.2019.03.05 Abstract ( )   PDF (685KB) ( )   By adjusting the discrete coordinates of road circular curve collected by GNSS (Global Satellite Navigation System) dynamic positioning technology, the parameters of circular curve can be retrieved. The adjustment theory of barycentric coordinate method is not rigorous enough, the definition of minimum condition of least square method is not completely reasonable, and the conditional adjustment method with parameters is easily affected by the initial value of parameters. Aims to solve these problems, an iterative algorithm of nonlinear total least squares for retrieving road circular curve parameters was proposed. The model construction, solution algorithm and algorithm design of the proposed algorithm were discussed; and the proposed algorithm was tested with simulation data and measured data. Furthermore, the comparative analysis with other three methods was carried out. The research results show that: 1) comparing with other three methods, the result of the nonlinear total least squares method is more closer to the true value and the corresponding error is smaller, and the result is more stable; 2) comparing with the conditional adjustment method with parameters, the nonlinear total least squares method is less affected by the initial value, and can obtain the radius of circular curve which is more in line with the actual situation; 3) comparing with barycentric coordinate method and least squares, the nonlinear total least squares method holds more rigorous parameter estimation theory. References | Related Articles | Metrics

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Reserach on the Operating Speed Transition Section Length at Ring off-ramp of B-type Trumpet Interchange PAN Binghong1,2, NI Xu1, TANG Lijiao1, ZHAO Yaru1, YU Yingjie1 2019, 38(03): 32-37.  DOI: 10.3969/j.issn.1674-0696.2019.03.06 Abstract ( )   PDF (498KB) ( )   In order to determine the minimum lengths of the operating speed transition section which meet the safe driving demand of vehicles at ring off-ramp of B-type trumpet interchange, the calculation models of the operating speed transition section length were set up respectively to meet the requirements of ultra-high transition, speed-changing driving and moderate lateral acceleration change rate. Through UMRR Kepler chain radar tachometer, the operating speeds at the diverging gore nose of the ring off-ramp were measured under different main line design speeds, and with SPSS software, the operating speed representative values at the diverging gore nose were obtained.Based on the length calculation models of the operating speed transition section and the analysis of the typical parameters,the minimum lengths of the operating speed transition section were obtained to meet different requirements. The results show that vehicle variable speed driving demand is the main control factor for the length of the transition section at the ring off-ramp of B-type trumpet interchange; and based on the safe driving demand of the vehicles, the minimum recommended values where proposed, as well as the correction coefficients of longitudinal slopes. References | Related Articles | Metrics

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Mix Proportions Design of Pervious Concrete Pavement and Its Performance Influence Factors LING Tianqing1, CHEN Qiaoqiao2, QIN Xin3, ZHANG Jun2 2019, 38(03): 38-43.  DOI: 10.3969/j.issn.1674-0696.2019.03.07 Abstract ( )   PDF (1000KB) ( )   By performing three-factor and three-level orthogonal test method, the influence of factors such as the aggregate gradation, the designed voids ratio and the water-cement ratio on the mechanical properties and permeability of pervious concrete such as 28-day compressive strength and flexural strength were studied. The results show that the main influencing factors of the strength and permeability coefficient of pervious concrete are mainly influenced by the design voidage, followed by gradation, and not much affected by the water-cement ratio. Aggregate particle size is a key factor affecting voidage. In order to guarantee both strength and permeability, it is recommended that the pass rate of 9.5 mm sieve hole is 70%, the designed voids ratio is 15%~20%, and the water-cement ratio is 0.35. References | Related Articles | Metrics

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Structure Optimization of Stone Roadbed Asphalt Pavement Based on Response Surface Method MA Shibin, GAO Jianqiang, WEI Jianhui, ZHANG Xiaoyun 2019, 38(03): 44-50.  DOI: 10.3969/j.issn.1674-0696.2019.03.08 Abstract ( )   PDF (1110KB) ( )   In order to improve the performance of asphalt pavement structure of stone subgrade, the response surface method was applied to optimize the pavement structure of asphalt surface, graded macadam base and stone subgrade. According to the new design index of the new specification for highway asphalt pavement design, the influence of the thickness of each pavement structure layer on the new index was analyzed. Taking the thickness of each surface layer and the thickness of base layer as constraints, the response surface optimization model was established by taking the number of fatigue cracking of asphalt mixture, the permanent deformation of asphalt mixture layer and the vertical compressive strain of roadbed top as response factors. The results show that the thickness of the surface layer has a significant effect on the permanent deformation, the number of fatigue cracks and the vertical compressive strain of roadbed top; while the thickness of graded macadam base layer has a little effect on the above three indexes. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

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Influence of the Structure of Retaining Wall Panels on Deformation Performance of Reinforced Earth Retaining Walls WANG Zongjian1,2, MA Shuwen1,2, LU Liang2, ZHANG Gengchuan3, SHEN Quan4 2019, 38(03): 51-59.  DOI: 10.3969/j.issn.1674-0696.2019.03.09 Abstract ( )   PDF (858KB) ( )   Taking the reinforced earth retaining wall panel as the research object, the model experiment of reinforced earth retaining wall was carried out by changing the structure form of the reinforced earth retaining wall panel (panel structure, panel stiffness), and the effect of different panel structure forms on the deformation performance of reinforced earth retaining wall was discussed. The results show that under the action of external loads, the deformation of the reinforced earth retaining wall panel shows an inverted triangular distribution;the reinforced soil retaining wall with composite panel bears higher load capacity and has better ability to adapt to deformation.Panel type plays an important role in the study of the deformation performance of reinforced earth retaining wall.The research results can provide some foundation and basis for the application of practical engineering. References | Related Articles | Metrics

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Experimental Investigation of Landslide Dam Failure Influenced By Initial Moisture Content and Manual Intervention LIU Jie1,2, YAN Ting2,3, ZHOU Chuanxing1,CHEN Wei1 2019, 38(03): 60-67.  DOI: 10.3969/j.issn.1674-0696.2019.03.10 Abstract ( )   PDF (1081KB) ( )   In order to explore the landslide dam failure process influenced by initial moisture content, five flume dam- breaking experiments were tested based on initial moisture content of 19.59%,8.9%,5.5%,4.2%,2.97% respectively. According to the investigation results of initial moisture content, the influence of manual intervention measures on the breach flow during the process of dam breaking was discussed by throwing different size of rocks. The experiment results indicate that: firstly,when the initial moisture content of the dam is 5.50%, the peak flow during the dam breaking process of landslide dam is 0.005 5 m3/s. If the moisture content is higher than the high moisture content case (19.59%,8.9%)and low moisture content case (4.2%，2.97%), it is the most disadvantageous initial moisture content. Secondly,the higher the initial moisture content of the dam body is,the faster the “steep ridge” of breach spreads to upstream during the dam breaking process.The nearer the narrowest contraction point of the breach is to the upstream of the dam body, the wider the width of the final breach is. Thirdly,with the decrease of initial moisture content of dam body, the time of dam breaking is prolonged correspondingly and the occurrence time of breach peak flow is delayed correspondingly. Finally,under the most disadvantageous initial moisture content case,throwing stones at the entrance of the breach can reduce the peak flow of the breach, and the peak flow of the breach can be reduced by 5.45%, 10.9% and 14.55% respectively, comparing with the conditions without throwing stones. Moreover, the peak flow appears time lag.The test results show that the initial moisture content of dam body is a very important factor in the process of dam breaking, and it is effective and obvious to control the flow of dam breaking by throwing stones. References | Related Articles | Metrics

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Numerical Simulation of Shear Characteristics of Sedimentary Layer in Sand-Mudstone Stratum TONG Dike1, HUANG Shiyuan2, JIAN Fuxian2, YUAN Peng3, LIU Congyang2 2019, 38(03): 68-74.  DOI: 10.3969/j.issn.1674-0696.2019.03.11 Abstract ( )   PDF (1209KB) ( )   Mechanical property of sedimentary layer is an important factor to study the deformation and stability of sand-mudstone interbedded rock slope. Based on laboratory test results, the simulative methods both contacting surface and thin layer element were adopted to simulate the shear behavior of sedimentary layer and compare the characteristics of stress-strain curves. The interlayer stress distribution of soft-hard interbedded rock slope under excavation condition was analyzed. The results show that when the contacting surface simulates the interfacial characteristics of sandstone and mudstone, the shear stress-strain curve conforms to the hyperbolic characteristics, showing the phenomenon of strain softening and obvious residual strength.The initial stress increases sharply when the thin layer element simulates the shear mechanical properties of the layer, and the simulation results are discrete to some extent compared with the experimental values.Both contacting surface and thin layer elements can simulate the shear stress-strain characteristics of sandstone-mudstone interface.It is difficult to control the convergence degree of the model calculation in the excavation process of bedding rock slope by the contacting surface method. The thin-layer element method is more conducive to simulate the shear stress distribution (i.e. shear dislocation effect) of the bedding rock slope under excavation. References | Related Articles | Metrics

Traffic & Transportation Engineering

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Location Method of Taxi Service Stations Based on Service Demands YE Zhen, HE Mingguang, LIANG Keke 2019, 38(03): 75-82.  DOI: 10.3969/j.issn.1674-0696.2019.03.12 Abstract ( )   PDF (1119KB) ( )   In order to satisfy the service demands from taxi drivers about eating, taking a break, parking and so on, and to improve the operating efficiencies and operation effectiveness of taxi business, it is necessary to carry out a research on location method of taxi service stations. Firstly, the spatial distribution characteristics of service demands of taxi service stations were analyzed, including the use of kernel density estimation method to analyze the service hotspots location and the use of fractal theory to analyze the coordination between the service demands distribution and urban morphology, and then the service station candidates were determined. Then, a location model of taxi service station was established. The maximum coverage of service demand was taken as the objective function, and the factors such as the number of service stations, service capacity, service scope and coverage demand ratio were taken as constraints. The optimal location analysis was carried out, and the relationship between the service capacity of service station and the satisfaction of service demand was discussed. Finally, taking the survey on location of taxi service station in Liuzhou as an example, the rationality and feasibility of the proposed model was verified. The results indicate that the proposed location method can better meet the development needs of taxi industry, especially service stations, and provide some useful references for the facilities planning of urban transportation. References | Related Articles | Metrics

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Accident Prediction of “24-Zigs” Mountain Road CHEN Liuxiao1, ZHANG Bo2, TANG Boming1, XIANG Hao1, DAI Guanglei1 2019, 38(03): 83-90.  DOI: 10.3969/j.issn.1674-0696.2019.03.13 Abstract ( )   PDF (1045KB) ( )   By using IHSDM (Interactive Highway Safety Design Model), the accident prediction of “24-zigs” mountain road was made, and the accident probability of the section from “the 21st-zig” to “the 22nd-zig” before and after improvement project in 1944 was predicted, so as to evaluate the driving security of “24-zigs” mountain road and to verify the rationality of the improvement project. The prediction results found that there were 4.02 accidents in the period from 1940 to 1945, and 68% of the accident type was “property loss only”. After the adjustment of “the 21st-zig” and “the 22nd-zig” in 1944 improvement project, the total number of accidents predicted for the improved sections decreased by 10.5%, the probability of “death and serious injury accidents” decreased by 14.3%, the accident rate of “the 4th-zig” turned down by 14.6%, and the accident rate of “the 5th-zig” turned down by 38.8%. The research results indicate that there is a low accident probability on “24-zigs” mountain road, and the accident damage is less severe. After the S-shaped curve with smaller radius is cancelled after the improvement project, the driving safety is improved. Obviously, although built in the wartime, the “24-zigs” mountain road can satisfy the primary driving security at that time, and its unique alignment design also provides design inspiration and technical reference for the construction of modern mountainous roads. References | Related Articles | Metrics

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Road Transport Energy Demand Forecasting Based on System Dynamics —— Taking Liaoning Province as an Example TANG Limin, WANG Yicheng, WANG Pan 2019, 38(03): 91-96.  DOI: 10.3969/j.issn.1674-0696.2019.03.14 Abstract ( )   PDF (610KB) ( )   The interaction between road transportation and economic, population and energy subsystems in Liaoning province was analysed in depth, and the system dynamics model of energy demand for road transportation in Liaoning Province was established. In the light of the relevant planning objectives of social and economic development as well as road transportation, forecast and scenario simulation were carried out. The research results indicate that: firstly, the energy demand for road transportation in Liaoning province in 2020 is about 18 million tons of standard coal. The average annual growth rate of freight turnover and passenger turnover in Liaoning are 2.38% and 4.2% respectively in “thirteenth five-year plan” period. Secondly, the adjustment of industrial structure will change the energy demand. The energy demand can be reduced by 1.1%, when the proportion of the tertiary industry is increased by 5%. Thirdly, energy demand can be reduced by 2.2%, when the energy consumption per unit turnover of freight cars is reduced by 14.3%. References | Related Articles | Metrics

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Stress Level Prediction of Controller Based on Cumulative Logistic Regression Model LIU Jixin, ZENG Xiaoyu, YIN Minjia, ZHU Xuehua 2019, 38(03): 97-102.  DOI: 10.3969/j.issn.1674-0696.2019.03.15 Abstract ( )   PDF (438KB) ( )   After analyzing and screening 7 significantly related indicators affecting the stress behavior of controllers, and classifying the stress degree of controllers in an orderly way, a prediction model of the stress degree of controllers based on cumulative logistic was established. Parallelism test was carried out on the prediction effect of the proposed model. The feasibility of the proposed prediction model was verified by using the quantitative measurement data of 74 other controllers in the actual data collected by an air traffic control authority. Results show that the significance level of the proposed models determining coefficient of goodness of fit (Pearson χ2 statistical magnitude and Deviance statistical magnitude) is 0.076 and 0.690 respectively, which are far greater than 0.05; the prediction accuracy of the measured data is 75.67%. The proposed model is more accurate in predicting the stress level of controllers. References | Related Articles | Metrics

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Driving Characteristics Analysis Based on Slope Climbing and Lane Changing JIANG Kang, SHEN Mengting, HUANG Zhipeng 2019, 38(03): 103-109.  DOI: 10.3969/j.issn.1674-0696.2019.03.16 Abstract ( )   PDF (1634KB) ( )   There are many slope sections in the road network, but people always tend to focus on the research of the downhill section and ignore the safety of the climbing section during the analysis of driving characteristics. At the same time, in the climbing process, the truck has the greatest impact on the traffic capacity. In view of this phenomenon, the cellular automata model for traffic flow was introduced and improved by using longitudinal gradient of climbing section. Two types of drivers, cautious and radical, were selected to analyze the difference of their lane-changing behavior. A cellular automata model of traffic flow based on slope-climbing and lane-changing was established. The influence of longitudinal gradient on the speed of trucks and the characteristics of slope climbing and lane changing of the two types of drivers were also analyzed. The simulation results show that the longitudinal gradient of the slope has a significant effect on the speed of trucks. Meanwhile, the two types of drivers choose active lane change according to the road conditions. The road capacity will be improved significantly if the dominant lane change drivers account for a higher proportion. References | Related Articles | Metrics

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Reverse Vehicle Searching System Based on Bluetooth Recognition PENG Jinshuan, SHU Linzhao, LIU Yin, SUN Pengcheng, ZHU Haoming, LIU Ke 2019, 38(03): 110-115.  DOI: 10.3969/j.issn.1674-0696.2019.03.17 Abstract ( )   PDF (495KB) ( )   With the continuously increase of car ownership in China, the number of large underground parking garages is increasing correspondingly, which meet the parking needs of people, but also bring many problems such as car searching difficulties. The idea of reverse vehicle searching in parking lot using Bluetooth technology was put forward. By using BLE technology of mobile Bluetooth and iBeacon device in parking lot, the areas of parking lot were divided; the mobile terminal processed information and proposed vehicle-searching route to complete off-line navigation. Experiment simulation was conducted in Matlab environment. The results show that the proposed system possesses strong practicability and convenience, which gets rid of the excessive reliance on GPS signals of the traditional vehicle searching system, and forms a new positioning and navigation mode with iBeacon “locating signal” as the core. References | Related Articles | Metrics

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Distribution Characteristics of Time Headway of Left-Turn Flow at Urban Signalized Intersection WEN Huiying1, ZENG Yuchen1, LI Shuo2 2019, 38(03): 116-123.  DOI: 10.3969/j.issn.1674-0696.2019.03.18 Abstract ( )   PDF (502KB) ( )   The characteristics of time headway distribution of left-turn traffic flow in peak and non-peak periods at Furong Middle Road: Renmin Middle Road — a typically signalized intersection in Changsha were analyzed under saturated and compound conditions respectively.The calculation of measured data at intersections shows that the prediction results of left-turn traffic flow saturated time headway by common methods such as CJJ37 in China and HCM2010 in America are larger than others, and the fitting results of four traditional headway distribution models and nine basic curve models in SPSS are not ideal. Piecewise function was used to establish the unified models under saturated and compound conditions respectively.By adjusting the calibration coefficient and growth coefficient of the model, the characteristics of time headway distribution in peak and non-peak periods were obtained respectively.The test analysis of the measured data shows that:over 27% of the vehicles share the highest percentage of the distribution of time headway in 2.000 to 2.500 seconds and over half of them stay in 1.500 to 2.500 seconds under saturated and compound conditions.The concentration of time headway distribution in non-peak period is lower than that in peak period, and tends to concentrate on smaller time headway.The prediction errors of the commonly used methods are usually more than 16%, while the errors of the proposed model are less than 4%.Compared with the traditional model, the proposed model can better fit the actual distribution of time headway, and the fitting effect is more ideal. References | Related Articles | Metrics

Vehicle &Electromechanical Engineering

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Reliability Optimization of Full Hydraulic Wet Drive Axle Housing Based on Response Surface Method ZHOU Junchao1,2,3, DU Zixue2,WANG Jie1, LIAO Yinghua1 2019, 38(03): 124-128.  DOI: 10.3969/j.issn.1674-0696.2019.03.19 Abstract ( )   PDF (699KB) ( )   To solve the low efficiency and uncertainty problem of the wet drive axle housing structure in the traditional optimization, an optimal design method which combined the response surface model with reliability was proposed.Based on the finite element model of the full hydraulic wet drive axle housing and the Latin square test design scheme, the second-order response surface approximation model of the driving axle housing was constructed by the least square method. On the basis of the above,the reliability optimization model was established with the minimum maximum stress of the driving axle housing as the optimization objective and the geometric parameters of the driving axle housing as the design variables. The optimization results of a driving axle housing show that the maximum stress of the optimized axle housing is reduced by 10.91%, and the quality of axle housing is reduced by 10.93%.Under the condition of meeting the corresponding strength requirements, the quality of the axle housing can be effectively reduced to achieve the purpose of reliability design. References | Related Articles | Metrics

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Flow Field Motion Analysis on Stirred Tank of PVA Fiber Bundle Dispersing Equipment CAO Yuanwen1, WU Chunyang1, LIN Yanwen1, XIA Zhulin2, ZHENG Nanxiang3 2019, 38(03): 129-134.  DOI: 10.3969/j.issn.1674-0696.2019.03.20 Abstract ( )   PDF (1332KB) ( )   In order to improve the dispersing quality of PVA fiber bundle dispersing equipment, the dispersing ability of stirring tank of PVA fiber bundle dispersing equipment was studied, and the stirring tank model of dispersing equipment was also established. Taking the baffle installed in agitation tank of dispersing equipment as the research object, the flow field motion analysis was carried out to explore the influence of baffle installation in stirred tank on the dispersion quality of PVA fibers. Furthermore, the comparative tests with and without baffle were carried out. The results show that installing the baffle in stirred tank of PVA fiber bundle dispersing equipment can effectively improve the fiber speed and turbulent kinetic energy in stirred tank, increase the tangential flow and improve the dispersion quality of PVA fiber bundles. References | Related Articles | Metrics

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Functional Safety Concept Design of Lane Keeping Assistance Based on ISO26262 WANG Junming, ZHOU Hongwei 2019, 38(03): 135-142.  DOI: 10.3969/j.issn.1674-0696.2019.03.21 Abstract ( )   PDF (483KB) ( )   The unitive and effective method to design vehicle automatic driving assistance system applying for functional safety standard ISO26262 is absent nowadays, especially for concept design phase. Therefore, the contents and requirements of the conceptual phase of Part-3 in ISO26262 were expounded in detail, including item definition, initiation of the safety life cycle, HARA analysis and function safety concept. The specific design method of concept phase in accordance with ISO26262 was introduced, and the detailed design steps and analysis process were elaborated according to the case of Lane Keeping Assistance (LKA). The proposed method has been applied to functional safety concept design of some automatic driving assistant systems of Changan automobiles, and provides some methodological guidance for other automatic driving assistant systems to carry out the conceptual design of functional safety. References | Related Articles | Metrics