洋塘大桥为独塔双索面内倾式斜拉桥,桥梁总长度为 607 m.主塔采用H形结构,主塔高度 65 m,共设有 17条拉索,其中1-8 号为索导管、9-17号为钢锚箱.为避免拉索与导管口发生碰撞,提高施工进度,索导管与钢锚箱的精准定位十分重要.该文结合实际工程和施工条件,提出索导管三维坐标定位方法,并研究出导管口精密定位装置及钢锚箱安装技术,以保证索导管和钢锚箱的精准快速施工.
In response to the differences and instability of gesture action signals,this paper proposes a gesture recognition method based on capacitive sensors and designs a device that can recognize gestures.The device collects and combines gesture signals features,to automatically locates and intercepts effective data of one single gesture.After preprocessing and feature extraction,it achieves real-time recognition of specific gestures,and complete the function of fighting between"1,2,3,4,5"and"Rock,Paper,Scissors"for punching and guessing.Before using the device,different keys are used to control the corresponding boxing and guessing training,and the intercepted data are recorded.After completing the training,the device can adaptively realize the gesture recognition of different people.
Highway mechanical and electrical equipment plays an important role in highway operation,but its maintenance and management is faced with challenges.In order to improve the maintenance efficiency and management level,first of all,strengthen the introduction and training of mechanical and electrical equipment maintenance personnel,through recruitment and cooperative training to improve the professional skills and knowledge of employees.Secondly,optimize the setting and management mode of maintenance organization,establish a perfect maintenance organization system,introduce advanced maintenance management concept and mode,improve maintenance efficiency and prolong the service life of equipment.In addition,enhance the safety awareness of mechanical and electrical employees,strengthen safety training and educational activities,strictly implement the safety management system,and ensure the safe operation of employees.At the same time,an information management system is established to realize the management and sharing of equipment files,maintenance records,fault repair and other information,so as to improve management efficiency.Through the above measures,we can improve the operation efficiency of the equipment and ensure the safe and stable operation of the highway,so as to provide the public with a higher quality and more secure travel environment.
A routing algorithm of Vehicular Ad Hoc Network based on geographical location and node trust value is designed.When transmitting data,the routing algorithm first obtains the geographical location information of the destination node and the neighbor node through beacon broadcasting,and then the node calls the forwarding algorithm to forward the data packet according to the collected geographic location information.The routing algorithm uses two forwarding strategies,greedy forwarding strategy and modified forwarding strategy,and obtains the average end-to-end delay and packet loss rate of the routing algorithm in a specific situation through experimental simulation.The effects of the number of vehicle nodes and the maximum speed of vehicle nodes on the performance of the routing algorithm are analyzed.
In order to solve the shortage of engineers in the process of container crane debugging,optimize the utilization of existing resources and improve the efficiency of construction engineering,the safety of remote debugging operation is realized.A series of advanced technical means are adopted,including video image monitoring,industrial control computer control system,remote intercom equipment and individual equipment,etc.,using 5G dedicated network cable to work together to achieve remote debugging.The results show that the debugging scheme of remote container crane successfully deals with the problem of shortage of engineers,optimizes the working environment of engineers,and reduces the safety risk during debugging.This shows that by adopting remote debugging operation,we can effectively make use of the advantages of modern technology and improve the efficiency of automatic project debugging,thus contributing to the sustainable development of the engineering field.
The MR(Magneto-Rheological)material can realize the variable stiffness and damping performance of the vibration isolation bearing.Based on the field measured data,the calculation model and parameters of the grid structure of the powerhouse of the hydropower station are established,and the vibration isolation performance of the MR bearing is calculated and analyzed under the two conditions of the field measured vibration data and the Wenchuan earthquake wave.The calculation results show that the parameters of the model can simulate the actual vibration of the space truss,and the MR isolation bearing can effectively reduce the vibration of the factory building grid during water discharge,and has a certain control effect in the event of a strong earthquake.
In this paper,an aerobic functional bacterium that can effectively degrade trichloroethylene(TCE)was domesticated,isolated and screened out from the samples collected from the actual site.The dominant strain was identified by 16S rDNA as Stenotrophomonas sp.TCE-1,and the optimal conditions for the functional bacteria to degrade the target pollutant were explored.The results showed that the optimum pH was 7.0 and culture temperature was 30℃.Under the above optimum conditions,when the initial TCE concentration was 10 mg/L,the aerobic degradation rate constant was 0.029 2 h-1,and the degradation half-life was 23.74 h.Additionally,the aerobic bacteria could mineralize TCE,and no other toxic chlorine products were detected during the degradation process.The research results will provide the technical support for the bioremediation of TCE contaminated sites.
According to the characteristics of on-site operation and the operation rules of Huanghua Port station,this paper analyzes the current situation of the compartment brake testing in the channel of Huanghua Port Station.Aiming at the problems of low manual efficiency,poor safety and low cooperation degree of on-site personnel in the process of the compartment brake testing in the station,the intelligent compartment brake testing technology scheme of Huanghua Port Station is proposed,and the intelligent compartment brake testing device is used to realize automatic collection of wind pressure at the end of the line.At the same time,data convergence and interactive transmission are realized based on the 5G network,and the pilot operation effect is presented to the driver through the interface prompt of the handheld terminal,and the autonomous operation with high safety,high reliability and high efficiency is finally realized with the driver as the core,so as to achieve the purpose of reducing staff and increasing efficiency,and promote the further improvement of the transport production quality of the station.
Based on the analysis of multiprotocol label switching(MPLS)and IP packet label switching(IPLS),and in view of the importance of marking in label switching network.This paper proposes to use the Entry Pointer of Route Cache(EPRC)as a mark of routing cache entry in IP network to imitate the process of label switching in IP packet forwarding,and the paper explains the related problems of EPRC.
With the popularity of 4K video and the rise of 8K video,the existing video encoding and compression technology has been unable to meet the needs of people.In this paper,the video encoding and compression technology is briefly introduced,and then from the point of view of human visual characteristics,the video encoding and compression technology is optimized from the dimensions of basic model design,encoding and decoding,in order to provide technical reference for more video processing related units,improve the quality of video encoding and compression,and contribute to the sustainable development of various industries in our country.Based on the analysis of the experimental results,the optimized video encoding can effectively improve the compression ratio and achieve the desired goal on the premise of the same image quality.
The main problems in the concrete construction of the underground accelerator room of the whole top-down building are as follows:it is difficult to guarantee the strength of C40 concrete prepared with brittle barite;the segregation is caused by downward transportation of concrete,and there is difficulty of simultaneous pouring in large quantities in limited space;mass concrete is prone to temperature cracks.The following measures have been taken:the qualified radiation-proof concrete is prepared by carefully selecting the material;the pressure relief deviceis used to solve the downward conveying segregation,and multi-group construction to achieve generous pouring;temperature cracks are effectively controlled through internal cooling,external heat preservation and repeatedly temperature measurement.The technology meets the requirements of crack control,therefore the pouring quality proves good.
Rotary drilling technology has been widely used in engineering construction because of its high hole forming effi-ciency,high quality and strong adaptability.Taking a railway bridge as an example,this paper discusses the construction process and key technology of rotary drilling rig hole forming technology,and analyzes the quality control measures of pile foundation con-struction based on the characteristics of rotary drilling technology.It is intended to provide a reference for similar engineering con-struction.
The preliminary design of bridge engineering needs to investigate the hydrogeological conditions,and the Anchorage foundation pit excavation and construction dewatering have great influence on the regional stability.In this paper,taking a Yangtze River highway bridge as an example,combined with hydrogeological investigation,water quality analysis,corrosion evaluation and other tests,its hydrogeological conditions are expounded and relevant parameters are obtained.In view of the special geotechnical geological problems,the water inflow of the foundation pit in different seasons is estimated,the relevant water gushing prevention measures are put forward,and the foundation Anchorage expansion scheme which meets the project is redesigned.It has a certain guiding significance for the engineering design of bridge expanded foundation Anchorage under similar complex hydrogeological conditions.
Through the dynamic pressure measurement test of the wing in the wind tunnel,the dynamic performance parameters of the wing can be obtained and the characteristics of dynamic stall can be understood,but in the actual dynamic pressure measurement test in the wind tunnel,due to the limitation of resources and field conditions,the data in the typical test state can only be obtained.In order to obtain more comprehensive pressure data under the limited test resources,this paper uses BP artificial neural network to establish a prediction model between test conditions and pressure values,and 18 groups of test data are used to verify the prediction results.Comparing the predicted results with the actual results,it is found that the BP neural network can effectively predict the pressure value and fluctuation value,and the error of the result is small.Therefore,in the limited test state,the BP neural network can accurately predict the large separated flow,can accord with the actual flow characteristics,and can provide comprehensive and reliable prediction data for the wind tunnel pressure test.
With the expansion of the scale of urban rail transit network,the operation risk increases gradually,and the maintenance cost increases day by day.With the emergence of technologies such as the Internet of Things,big data,cloud computing,intelligent decision-making and intelligent control,promote the smart,intelligent development of the rail transit industry,further improve rail transit operation safety,improve operation efficiency,optimize operation management,improve service quality,etc.,is the technical focus of widespread concern in the industry.By installing intelligent monitoring equipment,sensors and other on-line monitoring devices on the primary equipment,the urban rail transit power supply system can obtain the state quantity of traction substation equipment in time and realize rapid early warning,and establish an intelligent operation and maintenance system for urban rail transit power supply.Intelligent operation and maintenance can help to improve the operation efficiency of urban rail power supply system and improve the stability,safety and economy of traction power supply system.This paper selects some important equipment of urban rail substation for on-line monitoring,describes its health status,and studies the monitoring schemes of key equipment,including 110 kV GIS,oil-immersed transformer,35 kV GIS,DC1500 V switchgear,dry transformer and rectifier.The network diagram of intelligent operation and maintenance system of urban rail transit power supply system is built to provide reference for the construction of intelligent operation and maintenance of urban rail transit power supply system.
With the rapid development of power industry,the thermal temperature protection system of power plants is increasingly becoming a key part that ensures the normal operation of equipment and prevent overheating damage.Effective thermal temperature protection can not only ensure the safe and reliable operation of power plant equipment,but also avoid significant economic losses and production stagnation.Although the thermal temperature protection system of modern power plants has a high degree of automation and accuracy,its mistake action and failure action still occur from time to time,which affect the normal operation of the power plant.This paper will discuss the causes of mistake action and failure action of thermal temperature protection in power plants,and provide a valuable reference for related research and practice.
In intelligent manufacturing,RFID tags can accurately record the processing process and process information to meet the flexible production needs.Through the study of RFID technology,this paper upgrades the existing intelligent production line,selects the RFID hardware and designs the overall scheme for the actual production line,realizes the ModBus TCP communication and data exchange between RFID and industrial PLC,records the current production information of the product timely and accurately,ensures the traceability of the production process and improves the production efficiency.
According to the characteristics of too few zeros after HDB3 encoding and low transmission efficiency,this paper proposes an implementation method of HDB4 encoding and decoding based on FPGA,and gives the simulation waveform of Modelsim to complete the design and test of the hardware circuit.HDB4(fourth-order high-density bipolar)code has the characteristics of no DC component,no more than 4 connected zeros,high transmission efficiency,easy to extract clock signals and so on.The HDB4 encoder designed by this method has been used in related experiments.
At present,due to the structural characteristics of battery energy storage,there are still great safety risks in the process of use.This paper analyzes the characteristics of the fire in the battery system of the energy storage power station,and puts forward some problems that should be paid attention to in the fire protection design,which is of practical significance to the fire protection design of the energy storage power station in the future.
