The spreader of the automated rail mounted container gantry crane (ARMG) causes small offset or deflection oscillation because of the interference of random wind etc. so that cannot load and unload containers rapidly and accurately. This paper presents a fine tuning method by the traction of auxiliary wire ropes. The fine tuning system is simplified into a fully constrained 1R2T cable-driven parallel robot. The system dynamic model is established by Lagrange method, and the inverse dynamics solution is carried out by introducing the external force couple method. According to the real-time trajectory planning of spreader deflection, the position controller is designed based on computational moment method, and the simulation experiment platform is established by using MATLAB/Simulink based on dynamic model and servo control law. The interference force of wind and hoisting ropes is simulated by random signal to form the simulation closed-loop system. The simulation results show that the spreader can theoretically achieve the rapid and accurate positioning by the traction of auxiliary wire ropes after choosing the reasonable controller coefficients.
{"title":"Dynamic Modeling and Control of ARMG Spreader's Fine Tuning with Auxiliary Wire Ropes","authors":"Yinggang Zhang, Miao Chen, Qing Zhang, Xicong Xie, Liangjun Xu","doi":"10.1109/ICACMVE.2019.00046","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00046","url":null,"abstract":"The spreader of the automated rail mounted container gantry crane (ARMG) causes small offset or deflection oscillation because of the interference of random wind etc. so that cannot load and unload containers rapidly and accurately. This paper presents a fine tuning method by the traction of auxiliary wire ropes. The fine tuning system is simplified into a fully constrained 1R2T cable-driven parallel robot. The system dynamic model is established by Lagrange method, and the inverse dynamics solution is carried out by introducing the external force couple method. According to the real-time trajectory planning of spreader deflection, the position controller is designed based on computational moment method, and the simulation experiment platform is established by using MATLAB/Simulink based on dynamic model and servo control law. The interference force of wind and hoisting ropes is simulated by random signal to form the simulation closed-loop system. The simulation results show that the spreader can theoretically achieve the rapid and accurate positioning by the traction of auxiliary wire ropes after choosing the reasonable controller coefficients.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116618321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00055
Liu Zhao, Jin Tao, Zhu Yutian
A vehicle walking dynamics model considering tire elasticity was established to study the mechanism of vehicle shift quality affected by tire elasticity. The model was applied to shift process analysis and the motion equation of shift process was derived. A simulation model is established by Amesim based on the dynamic model. The shift process of a typical loader was calculated and the calculation results were compared between with and without the consideration of tire elasticity in aspects of vehicle acceleration, instantaneous impact, input and output speed of the gearbox, characteristics of clutch slipping. The results show that during the shift process the tire elasticity makes acceleration changes smoothly; the oncoming clutch has two sliding processes, smaller impact and longer shift time; the impact of oncoming clutch is related to the time it engaged; less total sliding friction work. The conclusion will provide important references for the improvement of shift quality.
{"title":"Research on the Mechanism of Construction Vehicle Shift Quality Affected by Tire Elasticity","authors":"Liu Zhao, Jin Tao, Zhu Yutian","doi":"10.1109/ICACMVE.2019.00055","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00055","url":null,"abstract":"A vehicle walking dynamics model considering tire elasticity was established to study the mechanism of vehicle shift quality affected by tire elasticity. The model was applied to shift process analysis and the motion equation of shift process was derived. A simulation model is established by Amesim based on the dynamic model. The shift process of a typical loader was calculated and the calculation results were compared between with and without the consideration of tire elasticity in aspects of vehicle acceleration, instantaneous impact, input and output speed of the gearbox, characteristics of clutch slipping. The results show that during the shift process the tire elasticity makes acceleration changes smoothly; the oncoming clutch has two sliding processes, smaller impact and longer shift time; the impact of oncoming clutch is related to the time it engaged; less total sliding friction work. The conclusion will provide important references for the improvement of shift quality.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"281 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121609878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00061
Yang Ke, Liu Wanli, Wang Baojian, Liu Zhiyu
In this paper, lifting mechanism of a certain maintenance vehicle is taken as the research object. Aiming at the problem of slow response of lifting, a control method based on fuzzy PID control strategy is proposed. This paper analyses the hydraulic system and structural characteristics of the maintenance vehicle lifting mechanism, constructs the mathematical model of the control object of the lifting mechanism, establishes the simulation model in the MATLAB/Simulink environment, and finally adds the fuzzy PID control method to the control model of the lifting mechanism, so that it can dynamically adjust the parameters of the controller. The conclusion shows that the fuzzy PID control effectively improves the response speed of the lifting mechanism and shortens the response time, which provides a theoretical basis and reference for the control of the maintenance vehicle lifting mechanism.
{"title":"The Control of Maintenance Vehicle Lifting Mechanism Based on Fuzzy PID","authors":"Yang Ke, Liu Wanli, Wang Baojian, Liu Zhiyu","doi":"10.1109/ICACMVE.2019.00061","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00061","url":null,"abstract":"In this paper, lifting mechanism of a certain maintenance vehicle is taken as the research object. Aiming at the problem of slow response of lifting, a control method based on fuzzy PID control strategy is proposed. This paper analyses the hydraulic system and structural characteristics of the maintenance vehicle lifting mechanism, constructs the mathematical model of the control object of the lifting mechanism, establishes the simulation model in the MATLAB/Simulink environment, and finally adds the fuzzy PID control method to the control model of the lifting mechanism, so that it can dynamically adjust the parameters of the controller. The conclusion shows that the fuzzy PID control effectively improves the response speed of the lifting mechanism and shortens the response time, which provides a theoretical basis and reference for the control of the maintenance vehicle lifting mechanism.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114818677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00052
Zhao Shengdun, Chen Fenglei, Wang Song
The working environment of coal mine roadway has become more severe with the extension of the depth of coal mine roadway. Therefore, there is a higher demand for the size and performance of trackless rubber tire vehicles. The rubber wheel drilling rig developed in combination with the actual needs of coal mine roadway. Based on the detailed calculation and comparison of the two schemes, the applicable drive hydraulic system is proposed. On this basis, the advantages in use are analyzed. Through theoretical analysis, the key parameters affecting the differential and differential problems are proposed. The applicable solutions for the two coal mines are studied, and a more suitable scheme is selected through comparison. The static and dynamic test results show that the system has good operation performance and high efficiency under the condition of limited volume of the rubber drilling rig, which makes it have high passability and stability.
{"title":"Research on Characteristics and Test of Hydraulic Driving System for Rubber Rig","authors":"Zhao Shengdun, Chen Fenglei, Wang Song","doi":"10.1109/ICACMVE.2019.00052","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00052","url":null,"abstract":"The working environment of coal mine roadway has become more severe with the extension of the depth of coal mine roadway. Therefore, there is a higher demand for the size and performance of trackless rubber tire vehicles. The rubber wheel drilling rig developed in combination with the actual needs of coal mine roadway. Based on the detailed calculation and comparison of the two schemes, the applicable drive hydraulic system is proposed. On this basis, the advantages in use are analyzed. Through theoretical analysis, the key parameters affecting the differential and differential problems are proposed. The applicable solutions for the two coal mines are studied, and a more suitable scheme is selected through comparison. The static and dynamic test results show that the system has good operation performance and high efficiency under the condition of limited volume of the rubber drilling rig, which makes it have high passability and stability.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116991575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00057
H. Mo, Feng Hao, Yin Chen-bo, Xu Mingyang
During the service, cracks may occur in the steel structures of the crane. The capacity and service life of the cracked structures can be improved by bonding composite patches to the cracked areas. In order to better formulate the adhesive repairing scheme of cracked structures, the finite element models of the cracked steel plates bonded with composite patches were established with ABAQUS. The effects of patch length, stiffness, steel plate thickness and adhesive layer shear stiffness on the stress intensity factor (SIF) at the crack tip and the adhesive layer stress of the repaired structure were analyzed. The results show that selecting reasonable patch parameters and adhesive layer shear stiffness can not only effectively reduce the stress intensity factor (SIF) at the crack tip, but also improve the stress state of the adhesive layer. The bonding technique has a poor repairing effect on cracked steel plates with a large thickness. The conclusions can provide references for the development of repairing scheme for cracked steel structures.
{"title":"Simulation Analysis of Cracked Steel Plate Bonded with Composite Patches","authors":"H. Mo, Feng Hao, Yin Chen-bo, Xu Mingyang","doi":"10.1109/ICACMVE.2019.00057","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00057","url":null,"abstract":"During the service, cracks may occur in the steel structures of the crane. The capacity and service life of the cracked structures can be improved by bonding composite patches to the cracked areas. In order to better formulate the adhesive repairing scheme of cracked structures, the finite element models of the cracked steel plates bonded with composite patches were established with ABAQUS. The effects of patch length, stiffness, steel plate thickness and adhesive layer shear stiffness on the stress intensity factor (SIF) at the crack tip and the adhesive layer stress of the repaired structure were analyzed. The results show that selecting reasonable patch parameters and adhesive layer shear stiffness can not only effectively reduce the stress intensity factor (SIF) at the crack tip, but also improve the stress state of the adhesive layer. The bonding technique has a poor repairing effect on cracked steel plates with a large thickness. The conclusions can provide references for the development of repairing scheme for cracked steel structures.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132931999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/icacmve.2019.00025
Liu Zhanhui, Zheng Shuli
The interference fit between of rivet and hole have been widely used in the mechanical structure, because of its simple structure, large bearing capacity. There are some failure of rivet and hole and hole interference fit in practice. In order to solve this problem, the interference fit model of rivet and hole was established. The spring mass model of interference fit between of rivet and hole was put forward based on the Saint Venant principle. The mechanical force equation of spring-mass model was obtained. Through the analysis of the rivet hole and obtain the stress state under different loads, when the load is small, the contact interface between of rivet and hole separation does not occur, can prolong the fatigue life of the structure; when the load is large, a rivet and a hole contact interface may cause contact separation, the fretting fatigue, and a hole for the rivet fit design suggestions.
{"title":"Study on Spring-Mass Model for Interference Fit between Rivet and Hole","authors":"Liu Zhanhui, Zheng Shuli","doi":"10.1109/icacmve.2019.00025","DOIUrl":"https://doi.org/10.1109/icacmve.2019.00025","url":null,"abstract":"The interference fit between of rivet and hole have been widely used in the mechanical structure, because of its simple structure, large bearing capacity. There are some failure of rivet and hole and hole interference fit in practice. In order to solve this problem, the interference fit model of rivet and hole was established. The spring mass model of interference fit between of rivet and hole was put forward based on the Saint Venant principle. The mechanical force equation of spring-mass model was obtained. Through the analysis of the rivet hole and obtain the stress state under different loads, when the load is small, the contact interface between of rivet and hole separation does not occur, can prolong the fatigue life of the structure; when the load is large, a rivet and a hole contact interface may cause contact separation, the fretting fatigue, and a hole for the rivet fit design suggestions.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115853487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00077
Yang Shengqi, Gao Shunde
After the coiled tubing operation, there will always be substances such as mud, sand or acid adhered to the inner wall of the coiled tube. Flushing after the last operation of the coiled tube does not achieve an optimum cleaning effect, and the liquid remaining on the inner wall of the coiled tube causes the burst below 0°C. In order to reduce the weight of the operation vehicle and to extend coiled tube's service life, it is necessary to add a draining process after flushing. Therefore, the model established in this study is based on the use of rubber plunger interferenced fit in the coiled tube, which promoted by the high pressure gas. Using ansys nonlinear analysis of the contact process to extract the contact pressure. There are three parameter considered: the interference between the rubber plunger and the pipe, the thickness of the rubber plunger and the differential pressure.
{"title":"Contact Force Simulation of Coiled Tube Clearing Process","authors":"Yang Shengqi, Gao Shunde","doi":"10.1109/ICACMVE.2019.00077","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00077","url":null,"abstract":"After the coiled tubing operation, there will always be substances such as mud, sand or acid adhered to the inner wall of the coiled tube. Flushing after the last operation of the coiled tube does not achieve an optimum cleaning effect, and the liquid remaining on the inner wall of the coiled tube causes the burst below 0°C. In order to reduce the weight of the operation vehicle and to extend coiled tube's service life, it is necessary to add a draining process after flushing. Therefore, the model established in this study is based on the use of rubber plunger interferenced fit in the coiled tube, which promoted by the high pressure gas. Using ansys nonlinear analysis of the contact process to extract the contact pressure. There are three parameter considered: the interference between the rubber plunger and the pipe, the thickness of the rubber plunger and the differential pressure.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132200415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00063
Su Zhicheng, Zhou Boya, Meng Qingyu, Dai Tianlu, Li Su
In the context of the rapid development of electric vehicles, various new energy vehicle companies are promoting technological upgrading of products. High efficiency of power system, lightweight body and parts are its main development trend. In order to analyze the technical level of electric vehicle power consumption, this paper analyzes the technical level of three batches of vehicles mainly from three aspects: power consumption, temperature adaptability and power performance based on the test results of 21 EV-TEST models. The results show that after one year of technology development, the energy consumption has been reduced by about 9.9%; The temperature adaptability in high temperature environment is increased by 40.9%. The temperature adaptability in low temperature environment has been increased by 25.3%; The power performance has been improved by 11.3%. It shows that with the progress of technology, electric vehicles are developing in the direction of low energy consumption and high performance.
{"title":"Trend Analysis of Electric Vehicle's Power Consumption Based on EV-TEST","authors":"Su Zhicheng, Zhou Boya, Meng Qingyu, Dai Tianlu, Li Su","doi":"10.1109/ICACMVE.2019.00063","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00063","url":null,"abstract":"In the context of the rapid development of electric vehicles, various new energy vehicle companies are promoting technological upgrading of products. High efficiency of power system, lightweight body and parts are its main development trend. In order to analyze the technical level of electric vehicle power consumption, this paper analyzes the technical level of three batches of vehicles mainly from three aspects: power consumption, temperature adaptability and power performance based on the test results of 21 EV-TEST models. The results show that after one year of technology development, the energy consumption has been reduced by about 9.9%; The temperature adaptability in high temperature environment is increased by 40.9%. The temperature adaptability in low temperature environment has been increased by 25.3%; The power performance has been improved by 11.3%. It shows that with the progress of technology, electric vehicles are developing in the direction of low energy consumption and high performance.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123284819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/ICACMVE.2019.00073
Gaoyang Wu, Guangjun Liu, Dingjun Wu, Lei Yang
Ship unloader always tries to maximize efficiency by improving the operating reliability while minimizing the maintenance costs and then obtain better reliable and economic result. According to the strategy of RCM (Reliability-centered maintenance) theory, the failure mode is analyzed by using FMEA (Failure mode and effects analysis). The decision process of the RCM strategy, maintenance type of the ship unloader and the maintenance of the key parts are proposed, which provides scientific decision support for the maintenance of the ship unloader.
卸船机总是力求在提高运行可靠性的同时最大限度地降低维修成本，从而获得较好的可靠性和经济性。根据RCM (reliability centered maintenance)理论，运用FMEA (failure mode and effects analysis)分析了故障模式。提出了卸船机RCM策略、维修类型和关键部件维修的决策过程，为卸船机维修提供了科学的决策支持。
{"title":"Research on the Reliability-Centered Maintenance Strategy of Ship Unloader","authors":"Gaoyang Wu, Guangjun Liu, Dingjun Wu, Lei Yang","doi":"10.1109/ICACMVE.2019.00073","DOIUrl":"https://doi.org/10.1109/ICACMVE.2019.00073","url":null,"abstract":"Ship unloader always tries to maximize efficiency by improving the operating reliability while minimizing the maintenance costs and then obtain better reliable and economic result. According to the strategy of RCM (Reliability-centered maintenance) theory, the failure mode is analyzed by using FMEA (Failure mode and effects analysis). The decision process of the RCM strategy, maintenance type of the ship unloader and the maintenance of the key parts are proposed, which provides scientific decision support for the maintenance of the ship unloader.","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"55 43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124763508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/icacmve.2019.00008
{"title":"ICACMVE 2019 Reviewers","authors":"","doi":"10.1109/icacmve.2019.00008","DOIUrl":"https://doi.org/10.1109/icacmve.2019.00008","url":null,"abstract":"","PeriodicalId":375616,"journal":{"name":"2019 International Conference on Advances in Construction Machinery and Vehicle Engineering (ICACMVE)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125461273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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