针对现有矿用防爆胶轮车在巷道内长期运行、传动元部件老化易变形导致传动失效问题,提出利用车辆动力学理论模型进行仿真和对比试验的方法,研究其传动能效。首先根据矿用胶轮车在实际工况下防爆和传动两部分能耗组成结构进行分析研究并...针对现有矿用防爆胶轮车在巷道内长期运行、传动元部件老化易变形导致传动失效问题,提出利用车辆动力学理论模型进行仿真和对比试验的方法,研究其传动能效。首先根据矿用胶轮车在实际工况下防爆和传动两部分能耗组成结构进行分析研究并得出能耗组成的参数,在此基础上利用CRUISE软件建立WqC2J(A)车型的传动系统模型,进行了传动能效特性试验,将试验结果与仿真结果进行对比研究。结果表明:WqC2J(A)型胶轮车试验防爆功损为9.1 kW、传动功损为3.8 k W、试验能效为71.3%,仿真能效为74.7%,仿真与试验结果基本吻合。由此建立的胶轮车传动系统模型是可行的,为后续的防爆发动机研究和整车动力匹配奠定了基础。展开更多
In order to understand the kinetic characteristics of coal gas desorption based on the pulsating injection （PI）, the research experimentally studied the kinetic process of methane desorption in terms of the PI and h...In order to understand the kinetic characteristics of coal gas desorption based on the pulsating injection （PI）, the research experimentally studied the kinetic process of methane desorption in terms of the PI and hydrostatic injection （HI）. The results show that the kinetic curves of methane desorption based on PI and HI are consistent with each other, and the diffusion model can best describe the characteristics of meth- ane desorption. Initial velocity, diffusion capacity and ultimate desorption amount of methane desorption after P! are greater than those after HI, and the ultimate desorption amount increases by 16.7-39.7%. Methane decay rate over the time is less than that of the HI. The PI influences the diffusion model param- eters, and it makes the mass transfer Biot number B＇_i decrease and the mass transfer Fourier series F＇_0 increase. As a result, PI makes the methane diffusion resistance in the coal smaller, methane diffusion rate greater, mass transfer velocity faster and the disturbance range of methane concentration wider than HI. Therefore, the effect of methane desorption based on PI is better than that of HI.展开更多
Forwarding is a major means of information dissemination on the Microblog platform.The article,combining static analysis and dynamic analysis,takes Microblog forwarding as the object of study,and studies the network t...Forwarding is a major means of information dissemination on the Microblog platform.The article,combining static analysis and dynamic analysis,takes Microblog forwarding as the object of study,and studies the network topology of grass-roots Microblog forwarding users.It also studies the correlation between characteristic quantity and forwarding times of Microblog network topology.Furthermore,it conducts modification on virus transmission model,builds and verifies the Microblog forwarding dynamical model.The study finds out that Microblog postings present qute strong dissemination capacity on the initial stage,and some Microblog postings with many forwarding times and long duration of forwarding process due to the dynamic growth of the forwarding user network and the joining of strong nodes make network infection density decrease in some phases.展开更多
文摘针对现有矿用防爆胶轮车在巷道内长期运行、传动元部件老化易变形导致传动失效问题,提出利用车辆动力学理论模型进行仿真和对比试验的方法,研究其传动能效。首先根据矿用胶轮车在实际工况下防爆和传动两部分能耗组成结构进行分析研究并得出能耗组成的参数,在此基础上利用CRUISE软件建立WqC2J(A)车型的传动系统模型,进行了传动能效特性试验,将试验结果与仿真结果进行对比研究。结果表明:WqC2J(A)型胶轮车试验防爆功损为9.1 kW、传动功损为3.8 k W、试验能效为71.3%,仿真能效为74.7%,仿真与试验结果基本吻合。由此建立的胶轮车传动系统模型是可行的,为后续的防爆发动机研究和整车动力匹配奠定了基础。
基金financially supported by the National Basic Research Program of China (No. 2011CB201205)the National Natural Science Foundation of China (No. 51274195)+2 种基金the Natural Science Foundation of Jiangsu Province of China (No. BK2012571)the National Major Scientific Instrument and Equipment Development Project of China (No. 2013YQ17046309)the Education Department Science and Technology Key Project of Henan Province of China (14B440007)
文摘In order to understand the kinetic characteristics of coal gas desorption based on the pulsating injection （PI）, the research experimentally studied the kinetic process of methane desorption in terms of the PI and hydrostatic injection （HI）. The results show that the kinetic curves of methane desorption based on PI and HI are consistent with each other, and the diffusion model can best describe the characteristics of meth- ane desorption. Initial velocity, diffusion capacity and ultimate desorption amount of methane desorption after P! are greater than those after HI, and the ultimate desorption amount increases by 16.7-39.7%. Methane decay rate over the time is less than that of the HI. The PI influences the diffusion model param- eters, and it makes the mass transfer Biot number B＇_i decrease and the mass transfer Fourier series F＇_0 increase. As a result, PI makes the methane diffusion resistance in the coal smaller, methane diffusion rate greater, mass transfer velocity faster and the disturbance range of methane concentration wider than HI. Therefore, the effect of methane desorption based on PI is better than that of HI.
基金The research is supported by National Basic Research Program of China (973 Program)，Project of National Natural Science Foundation of China，the Fundamental Research Funds for the Central Universities (2013RC0603)."
文摘Forwarding is a major means of information dissemination on the Microblog platform.The article,combining static analysis and dynamic analysis,takes Microblog forwarding as the object of study,and studies the network topology of grass-roots Microblog forwarding users.It also studies the correlation between characteristic quantity and forwarding times of Microblog network topology.Furthermore,it conducts modification on virus transmission model,builds and verifies the Microblog forwarding dynamical model.The study finds out that Microblog postings present qute strong dissemination capacity on the initial stage,and some Microblog postings with many forwarding times and long duration of forwarding process due to the dynamic growth of the forwarding user network and the joining of strong nodes make network infection density decrease in some phases.
