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Dynamic model building and simulation for mechanical main body of lunar lander 被引量:6
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作者 王少纯 邓宗全 +1 位作者 胡明 高海波 《Journal of Central South University of Technology》 2005年第3期329-334,共6页
Focused on the dynamics problems of a lunar lander during landing process, the whole process was analysed in detail, and the linear elastic model of the moon soil was established by means of experiments-analogic metho... Focused on the dynamics problems of a lunar lander during landing process, the whole process was analysed in detail, and the linear elastic model of the moon soil was established by means of experiments-analogic method. Combining the way of elastic impact with the way of velocity replacement, the dynamics model of damping free vibration dynamics model with 3-degree of freedom(DOF) for lunar lander is obtained according to the vibration mechanics elementary theory. Based on Lagrange equations and the energy principle, the damping free vibration differential equations for the lunar lander with 3-DOF are derived and the equations are solved in simulation ways by means of ADAMS software. The conclusions obtained can be used for the design and manufacture of lunar lander. 展开更多
关键词 lunar lander dynamics model simulation
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Theoretical design and dynamic simulation of new mining paths of tracked miner on deep seafloor 被引量:8
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作者 戴瑜 刘少军 《Journal of Central South University》 SCIE EI CAS 2013年第4期918-923,共6页
With comprehensive considerations of the operational safety and collection efficiency for the tracked miner collecting the seafloor poly-metallic nodules, two new improved mining paths for the miner on the deep seaflo... With comprehensive considerations of the operational safety and collection efficiency for the tracked miner collecting the seafloor poly-metallic nodules, two new improved mining paths for the miner on the deep seafloor were proposed. Compared to the conventional mining path, the design principles and superiorities of the two new paths are that the miner turning with relative long radius should avoid large sinkage and high slip, so as to ensure its operational safety, while the space between its straight-line trajectories before and after the turning is optimum, which is designed as the total width of the miner, and collect nodules as more as possible, so as to ensure its collection efficiency. To realize the new mining paths, theoretical designs and quantitative calculations were carried out to determine the exact positions for the speed controls of the miner during its whole operation process. With the new dynamic model of the miner, and through regulations of the speeds of the left and right tracks of the miner on the exact motion positions according to the theoretical calculations, the two new improved mining paths for the miner on the seafloor were successfully simulated, thus the turning radius of the miner in the simulation is about 21.8 m, while the distance between the straight-line trajectories before and after the turning is about 5.2 m. The dynamic simulation results preliminarily prove the feasibility of these two new mining paths, and further can provide important theoretical guidance and useful technical reference for the practical tracked miner operation and control on the seafloor. 展开更多
关键词 deep ocean mining tracked miner single-body model mesh element model collection efficiency mining path dynamic simulation
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Dynamic simulation and experimental study of inspection robot for high-voltage transmission-line 被引量:6
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作者 肖晓晖 吴功平 +1 位作者 杜娥 史铁林 《Journal of Central South University of Technology》 EI 2005年第6期726-731,共6页
A mobile robot developed by Wuhan University for full-path hotline inspection on 220 kV transmission lines was presented. With 4 rotating joints and 2 translational ones, such robot is capable of traveling along non- ... A mobile robot developed by Wuhan University for full-path hotline inspection on 220 kV transmission lines was presented. With 4 rotating joints and 2 translational ones, such robot is capable of traveling along non- obstaclestraight-line segment and surmounting straight-line segment obstacles as well as transferring between two spans automatically. Lagrange’s equations were utilized to derive dynamic equations of all the links, including items of inertia, coupling inertia, Coriolis acceleration, centripetal acceleration and gravity. And a dynamic response experiment on elemental motions of robot prototype’s travelling along non-obstacle straight-line segment and surmounting obstacles was performed on 220 kV 1∶1 simulative overhanging transmission-line in laboratory. In addition, dynamic numerical simulation was conducted in the corresponding condition. Comparison and analysis on results of experiment and numerical simulation have validated theoretical model and simulation resolution. Therefore, the dynamic model formed hereunder can be used for the study of robot control. 展开更多
关键词 inspection robot TRANSMISSION-LINE dynamic modeling numerical simulation dynamic experiment
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Numerical simulation of dynamic fracture properties of rocks under different static stress conditions 被引量:7
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作者 LIANG Zheng-zhao QIAN Xi-kun +1 位作者 ZHANG Ya-fang LIAO Zhi-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期624-644,共21页
When underground cavities are subjected to explosive stress waves,a uniquely damaged zone may appear due to the combined effect of dynamic loading and static pre-load stress.In this study,a rate-dependent two-dimensio... When underground cavities are subjected to explosive stress waves,a uniquely damaged zone may appear due to the combined effect of dynamic loading and static pre-load stress.In this study,a rate-dependent two-dimensional rock dynamic constitutive model was established to investigate the dynamic fractures of rocks under different static stress conditions.The effects of the loading rate and peak amplitude of the blasting wave under different confining pressures and the vertical compressive coefficient(K_(0))were considered.The numerical simulated results reproduced the initiation and further propagation of primary radial crack fractures,which were in agreement with the experimental results.The dynamic loading rate,peak amplitude,static vertical compressive coefficient(K_(0))and confining pressure affected the evolution of fractures around the borehole.The heterogeneity parameter(m)plays an important role in the evolution of fractures around the borehole.The crack propagation path became more discontinuous and rougher in a smallerheterogeneity parameter case. 展开更多
关键词 rock mechanics coupled static and dynamic loading numerical simulation rate-dependent damage constitutive model
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Multi-domain modeling and simulation of proportional solenoid valve 被引量:3
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作者 刘艳芳 戴振坤 +1 位作者 徐向阳 田亮 《Journal of Central South University》 SCIE EI CAS 2011年第5期1589-1594,共6页
A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equation... A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equations of the valve were derived in the form of nonlinear state equations.By comparing the simulated and measured data,the simulation model is validated with a deviation less than 15%,which can be used for the structural design and control algorithm optimization of proportional solenoid valves. 展开更多
关键词 fluid mechanics proportional solenoid valve dynamic characteristic multi-domain modeling simulation
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Rigid body dynamics modeling, experimental characterization, and performance analysis of a howitzer
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作者 Nachiketa TIWARI Mukund PATIL +2 位作者 Ravi SHANKAR Abhishek SARASWAT Rituraj DWIVEDI 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2016年第6期480-489,共10页
A large caliber howitzer is a complex and cumbersome assembly. Understanding its dynamics and performance attributes' sensitivity to changes in its design parameters can be a very time-consuming and expensive exer... A large caliber howitzer is a complex and cumbersome assembly. Understanding its dynamics and performance attributes' sensitivity to changes in its design parameters can be a very time-consuming and expensive exercise, as such an effort requires highly sophisticated test rigs and platforms. However, the need of such an understanding is crucially important for system designers, users, and evaluators. Some of the key performance attributes of such a system are its vertical jump, forward motion, recoil displacement, and force transmitted to ground through tires and trail after the gun has been fired. In this work, we have developed a rigid body dynamics model for a representative howitzer system, and used relatively simple experimental procedures to estimate its principal design parameters. Such procedures can help in obviating the need of expensive experimental rigs, especially in early stages of the design cycle. These parameters were subsequently incorporated into our simulation model,which was then used to predict gun performance. Finally, we conducted several sensitivity studies to understand the influence of changes in various design parameters on system performance. Their results provide useful insights in our understanding of the functioning of the overall system. 展开更多
关键词 HOWITZER GUN CAD modeling dynamic simulation RECOIL ASSEMBLY PARAMETERS Sensitivity ANALYSIS
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基于Solidworks Simulation的三坐标测量仪动态误差分析 被引量:7
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作者 赵磊 杨杰 《机床与液压》 北大核心 2012年第1期39-41,82,共4页
采用三坐标测量仪进行高速测量时,由于受附加惯性力及自身重力的影响,机体会变形,从而导致动态误差。对三坐标测量机的动态误差进行理论分析;利用Solidworks Simulation有限元分析方法对移动桥进行受力变形分析;在z轴静止状态下,推导出... 采用三坐标测量仪进行高速测量时,由于受附加惯性力及自身重力的影响,机体会变形,从而导致动态误差。对三坐标测量机的动态误差进行理论分析;利用Solidworks Simulation有限元分析方法对移动桥进行受力变形分析;在z轴静止状态下,推导出滑架沿y轴方向加速(减速)和匀速的运动状态下动态误差补偿模型。仿真结果表明:各运动状态下的动态误差有效降低,为提高三坐标测量机的测量精度奠定基础。 展开更多
关键词 三坐标测量仪 动态误差 SOLIDWORKS simulation软件 补偿模型
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Complete geometric nonlinear formulation for rigid-flexible coupling dynamics 被引量:4
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作者 刘铸永 洪嘉振 刘锦阳 《Journal of Central South University》 SCIE EI CAS 2009年第1期119-124,共6页
A complete geometric nonlinear formulation for rigid-flexible coupling dynamics of a flexible beam undergoing large overall motion was proposed based on virtual work principle, in which all the high-order terms relate... A complete geometric nonlinear formulation for rigid-flexible coupling dynamics of a flexible beam undergoing large overall motion was proposed based on virtual work principle, in which all the high-order terms related to coupling deformation were included in dynamic equations. Simulation examples of the flexible beam with prescribed rotation and free rotation were investigated. Numerical results show that the use of the first-order approximation coupling (FOAC) model may lead to a significant error when the flexible beam experiences large deformation or large deformation velocity. However, the correct solutions can always be obtained by using the present complete model. The difference in essence between this model and the FOAC model is revealed. These coupling high-order terms, which are ignored in FOAC model, have a remarkable effect on the dynamic behavior of the flexible body. Therefore, these terms should be included for the rigid-flexible dynamic modeling and analysis of flexible body undergoing motions with high speed. 展开更多
关键词 flexible beam rigid-flexible coupling dynamic modeling numerical simulation
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Simulation and experimental study of high pressure switching expansion reduction considering real gas effect 被引量:2
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作者 罗语溪 张彦军 +2 位作者 高玉宝 王宣银 徐志鹏 《Journal of Central South University》 SCIE EI CAS 2014年第6期2253-2261,共9页
Switching expansion reduction(SER)uses a switch valve instead of the throttle valve to realize electronically controlled pressure reduction for high pressure pneumatics.A comprehensive and interactive pneumatic simula... Switching expansion reduction(SER)uses a switch valve instead of the throttle valve to realize electronically controlled pressure reduction for high pressure pneumatics.A comprehensive and interactive pneumatic simulation model according to the experimental setup of SER has been built.The mathematical model considers heat exchanges,source air pressure and temperature,environmental temperatures and heat transfer coefficients variations.In addition,the compensation for real gas effect is used in the model building.The comparison between experiments and simulations of SER indicates that,to compensate the real gas effect in high pressure discharging process,the thermal capacity of air supply container in simulation should be less than the actual value.The higher the pressure range,the greater the deviation.Simulated and experimental results are highly consistent within pressure reduction ratios ranging from 1.4 to 20 and output air mass flow rates ranging from 3.5 to 132 g/s,which verifies the high adaptability of SER and the validity of the mathematic model and the compensation method. 展开更多
关键词 high pressure pneumatics pressure reduction dynamic simulation model real gas effect
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Numerical study on dynamic properties of rubberised concrete with different rubber contents 被引量:1
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作者 Lei Pan Hong Hao +1 位作者 Jian Cui Thong M.Pham 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第6期228-240,共13页
As a green environmentally-friendly material,rubberised concrete(Ru C),which has the characteristics of low elastic modulus,large deformation capacity,high damping,good energy dissipation and good crack resistance,has... As a green environmentally-friendly material,rubberised concrete(Ru C),which has the characteristics of low elastic modulus,large deformation capacity,high damping,good energy dissipation and good crack resistance,has attracted extensive attention and research in the civil engineering discipline.However,most of existing studies are based on experimental tests on Ru C material properties,and there has been no numerical study based on meso-scale modelling of Ru C yet.To more comprehensively investigate the Ru C dynamic material properties without conducting intensive experimental tests,this study developed a high-fidelity meso-scale model considering coarse and fine aggregates and rubber crumbs to numerically investigate the mechanical properties of rubberised concrete under different strain rates.The meso-scale model was verified against both quasi-static compressive testing data and Split Hopkinson Pressure Bar(SHPB)dynamic testing data.Using the verified numerical model,the dynamic properties of rubberised concrete with various rubber content(0%-30%)under different strain rates were studied.The numerical results show that the developed meso-scale model can use to predict the static and dynamic properties of rubberised concrete with high accuracy.The dynamic compressive strength of the rubberised concrete increases with the increment of the strain rate,and the strain rate sensitivity increases with the rubber content ranging from 0 to 30%.Based on intensive numerical simulation data,empirical DIFs is used as a function of strain rate and rubber content to predict the dynamic strength of rubberised concrete. 展开更多
关键词 Rubberised concrete Meso-scale model Numerical simulation Strain rate effect dynamic increase factor
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基于Simulation X汽车起步过程离合器滑磨功仿真分析 被引量:5
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作者 龚鹏 李灯辉 +1 位作者 刘刚 荣刚 《机械设计》 CSCD 北大核心 2019年第3期105-109,共5页
针对某型车辆从原地静止状态到开始运动时,离合器主、从动盘从分离状态到结合成一个整体过程中,节气门开度α及压紧机构压紧时间tc对滑磨功的变化程度及趋势进行了理论探讨,利用Simulation X软件对发动机和离合器等部件进行建模仿真,模... 针对某型车辆从原地静止状态到开始运动时,离合器主、从动盘从分离状态到结合成一个整体过程中,节气门开度α及压紧机构压紧时间tc对滑磨功的变化程度及趋势进行了理论探讨,利用Simulation X软件对发动机和离合器等部件进行建模仿真,模拟某型车辆在起步工况下离合器滑磨功的产生及变化趋势,进而使某型车辆在其离合器设计、校核时,对其滑磨功的控制提供一定的理论依据。 展开更多
关键词 离合器 滑磨功 动力模型 仿真
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Mechanism on simulation and experiment of pre-crack seam formation in stope roof 被引量:1
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作者 胡建华 雷涛 +2 位作者 周科平 刘浪 劳德正 《Journal of Central South University》 SCIE EI CAS 2014年第4期1526-1533,共8页
The pre-crack blast technology has been used to control the induction caving area in the roof. The key is to form the pre-crack seam and predict the effect of the seam. The H-J-C blast model was built in the roof. Bas... The pre-crack blast technology has been used to control the induction caving area in the roof. The key is to form the pre-crack seam and predict the effect of the seam. The H-J-C blast model was built in the roof. Based on the theories of dynamic strength and failure criterion of dynamic rock, the rock dynamic damage and the evolution of pre-crack seam were simulated by the tensile damage and shear failure of the model. According to the actual situation of No. 92 ore body test stope at Tongkeng Mine, the formation process of the pre-crack blast seam was simulated by Ansys/Ls-dyna software, the pre-crack seam was inspected by a system of digital panoramic borehole camera. The pre-crack seam was inspected by the system of digital panoramic borehole in the roof. The results of the numerical simulation and inspection show that in the line of centers of pre-hole, the minimum of the tensile stress reaches 20 MPa, which is much larger than 13.7 MPa of the dynamic tensile strength of rock. The minimum particle vibration velocity reaches 50 cm/s, which is greater than 30-40 cm/s of the allowable vibration velocity. It is demonstrated that the rock is destroyed near the center line and the pre-crack is successfully formed by the large diameters and large distances pre-crack holes in the roof. 展开更多
关键词 induction caving dynamic damage model pre-crack seam numerical simulation digital borehole camera
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Sparsity-based efficient simulation of cluster targets electromagnetic scattering
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作者 TIAN Yuguang LIU Yixin +3 位作者 CHEN Xuan CHEN Penghui WANG Jun CHEN Junwen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第2期299-306,共8页
An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transform... An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transformation method is used to establish a geometric model of the observation scene,which is described by the azimuth angles and elevation angles of the radar in the target reference frame and the attitude angles of the target in the radar reference frame.Then,an approach for dynamic electromagnetic scattering simulation is proposed.Finally,a fast-computing method based on sparsity in the time domain,space domain,and frequency domain is proposed.The method analyzes the sparsity-based dynamic scattering characteristic of the typical cluster targets.The error between the sparsity-based method and the benchmark is small,proving the effectiveness of the proposed method. 展开更多
关键词 geometric model of the observation scene dynamic electromagnetic scattering simulation sparsity-based method
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煤矿冲击地压数值物理模拟方法与应用研究
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作者 齐庆新 王守光 +7 位作者 王美美 崔春阳 刘化广 王嘉敏 穆鹏宇 朱小景 李海涛 许学伟 《矿业安全与环保》 北大核心 2025年第1期1-13,共13页
由于冲击地压现场试验危险性高、监测困难、难以控制触发机制等局限,建立有效的物理相似模拟和数值模拟方法是冲击地压机理与防治研究的重要手段。针对冲击地压物理相似模拟,介绍了相似模拟实验材料的研发进展,在静力相似准则基础上发... 由于冲击地压现场试验危险性高、监测困难、难以控制触发机制等局限,建立有效的物理相似模拟和数值模拟方法是冲击地压机理与防治研究的重要手段。针对冲击地压物理相似模拟,介绍了相似模拟实验材料的研发进展,在静力相似准则基础上发展了煤岩体动力相似准则,提出了惯性力相似条件,在此基础上开展材料研发和相似模型设计,研究表明:由高聚物、石英砂等组成的相似材料与煤岩动力破坏过程的强度和破坏模式等均具有较好的相似性;结合冲击地压应力波场物理相似模拟试验台,开展了波场传播诱冲过程相似模拟实验,发现应力波在顶底板间相互干涉、叠加,形成煤层槽波,应变场整体上也逐步汇聚在煤层,形成局部化带,最终导致冲击破坏。针对冲击地压数值模拟,介绍了有限元法等连续介质力学方法、离散元法等不连续变形模拟方法,以及连续介质力学-不连续变形耦合方法在冲击地压数值模拟中的研究进展,分析了非线性有限元与不平衡力理论在研究冲击地压潜在风险中的应用前景,围绕煤岩体弹射的势动能瞬态转换力学机制,分别阐述了弹射前期高弹性能体形成、弹射中期岩体瞬间脆断和块体形成的非平衡条件、弹射后期块体运动的模拟思路。最后,介绍了近场动力学与有限元耦合模拟算法在模拟煤岩冲击地压连续-非连续转换中的初步应用,取得了预期效果。本研究有望为煤矿冲击地压模拟提供新思路,对于煤矿安全生产具有重要意义。 展开更多
关键词 冲击地压 物理相似模拟 动力相似准则 数值模拟 弹射理论模型
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郑庄区块岩石力学特征对压裂的影响及开发对策
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作者 张聪 赵立平 +6 位作者 杨瑞强 王琪 桑广杰 李可心 王玉婷 贾慧敏 李俊 《煤炭科学技术》 北大核心 2025年第3期315-327,共13页
煤储层岩石力学特征对天然裂缝的形成演化及人工裂缝的扩展规律具有重要控制作用,是影响煤储层压裂改造的关键因素。为明确郑庄区块岩石力学特征和压裂裂缝发育规律,实现煤储层高效改造和开发,利用阵列声波测井资料建立纵横波转换模型,... 煤储层岩石力学特征对天然裂缝的形成演化及人工裂缝的扩展规律具有重要控制作用,是影响煤储层压裂改造的关键因素。为明确郑庄区块岩石力学特征和压裂裂缝发育规律,实现煤储层高效改造和开发,利用阵列声波测井资料建立纵横波转换模型,基于岩石力学参数试验和测井计算建立动静态岩石力学参数转换模型,利用声波时差、密度等常规测井数据,计算得到郑庄区块岩石力学参数分布规律。在此基础上,利用FrSmart压裂模拟软件建立郑庄区块不同井区水平井的地质力学模型,开展压裂模拟探究岩石力学参数和压裂规模对压裂裂缝形态的影响,并针对不同井区提出差异化开发对策。结果表明:郑庄区块静态弹性模量在0.28~1.45 GPa,平均为0.95 GPa,静态泊松比为0.31~0.34,平均为0.32,整体呈不均匀分布。随着煤储层弹性模量的不断增大和泊松比的减小,压裂缝长和单缝宽均有逐渐减小的趋势。压裂缝长和单缝宽与压裂规模有正相关关系,增加压裂液量和砂量可以有效增加压裂缝长和单缝宽,提高裂缝体积。增大施工排量,压裂缝长、单缝宽、裂缝体积均大幅度增加。在郑庄区块北部开展大规模大排量压裂先导试验,裂缝监测结果显示:平均压裂缝长超400 m,缝宽在40 m以上,平均单段储层改造体积170×10^(4) m^(3),改造效果较以往提升580%。在后续开发过程中,郑庄区块北部井区建议采用大规模大排量压裂,最佳井距为320 m;中北部井区建议采用中等压裂规模进行改造,最佳井距为300 m;西南部井区建议采用中等规模压裂,最佳井距为260 m。 展开更多
关键词 沁水盆地 郑庄区块 岩石力学参数 动静态转换模型 压裂模拟
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基于前桥动力学模型的前轴寿命评估方法
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作者 冯金芝 桑武壮 +3 位作者 张东东 李亮亮 刘新荣 赵礼辉 《机械强度》 北大核心 2025年第4期9-19,共11页
针对车桥等零部件企业难以获取零部件耐久性试验规范的局限,提出一种前桥动力学模型驱动载荷构建方法,为前轴系统级台架试验与寿命验证奠定基础。基于整车动力学模型与实测道路载荷获取前轴寿命,以其过程及结果为参考,进行前桥模型驱动... 针对车桥等零部件企业难以获取零部件耐久性试验规范的局限,提出一种前桥动力学模型驱动载荷构建方法,为前轴系统级台架试验与寿命验证奠定基础。基于整车动力学模型与实测道路载荷获取前轴寿命,以其过程及结果为参考,进行前桥模型驱动信号迭代。首先,对实测轮心六分力进行频带调整;其次,以前轴在各工况下的损伤/寿命与参考值差值最小为目标,结合响应面法与遗传算法对轮心三向力幅值调整系数进行优化,优化后的轮心三向力与其余三向力矩构成了前桥模型驱动信号。仿真结果表明,采用构建的轮心驱动信号进行前桥模型动态载荷模拟,获取的前轴寿命、风险点失效顺序以及各路况对危险点的损伤贡献比等都与参考结果具有较好的一致性,验证了提出方法的有效性,可为系统级台架耐久性试验的驱动信号构建与零部件寿命评估提供参考。最后,经过损伤主导载荷修正后,轴管损伤分布也与参考结果一致。 展开更多
关键词 前桥动力学模型 前轴寿命 响应面法 动态载荷模拟 台架试验
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太阳能吸收制冷循环动态特性仿真方法研究
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作者 马爱华 赵帅 +1 位作者 王林 常明慧 《化工学报》 北大核心 2025年第S1期318-325,共8页
太阳能吸收制冷循环在额定工况下展现出高效的制冷性能,然而,其固有的缺陷在于变工况性能欠佳,甚至可能导致工作失效。作为一项几乎不依赖电能的制冷技术,太阳能吸收制冷技术面临着太阳能供应间歇性和用户侧需求波动性的双重挑战,这些... 太阳能吸收制冷循环在额定工况下展现出高效的制冷性能,然而,其固有的缺陷在于变工况性能欠佳,甚至可能导致工作失效。作为一项几乎不依赖电能的制冷技术,太阳能吸收制冷技术面临着太阳能供应间歇性和用户侧需求波动性的双重挑战,这些因素严重影响了循环的工作效能。从系统内部参数与外部参数动态匹配的角度出发,运用现代控制理论,构建了太阳能单效LiBr-H2O吸收式制冷循环的状态空间模型。通过稳态仿真与实验数据的对比,验证了该动态模型的有效性,并进一步探究了不同扰动因素下循环的动态响应特性。研究结果显示,所建立的状态空间动态模型能够准确地描述太阳能吸收制冷循环的动态行为,清晰地揭示了循环输入变量、状态变量与输出变量之间的动态关联。 展开更多
关键词 吸收 制冷 状态空间模型 动态仿真 瞬态响应
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风险演化研究综述及其在轨道交通领域的应用与探讨
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作者 李曼 刘贵源 +3 位作者 王艳辉 贾利民 郭湛 张坤 《铁道运输与经济》 北大核心 2025年第1期13-30,共18页
风险内涵分析及风险演化机制是目前风险管理研究领域的热点问题。研究首先采用文献计量法与内容分析法,构建国内外风险演化研究的共现网络图,全面剖析了风险演化领域的研究特征、热点主题分布,发现风险演化主要围绕基于图论的风险分析... 风险内涵分析及风险演化机制是目前风险管理研究领域的热点问题。研究首先采用文献计量法与内容分析法,构建国内外风险演化研究的共现网络图,全面剖析了风险演化领域的研究特征、热点主题分布,发现风险演化主要围绕基于图论的风险分析与安全评估、基于系统论的风险评估、基于机器学习的风险预测与失效分析以及基于仿真与建模技术的风险传播与故障分析4个热点主题开展。其次,构建了风险管理框架,系统性分析并提出了风险演化方法体系。从系统论、因果逻辑、图论、建模仿真以及机器学习5方面详细阐述了风险演化研究方法。最后,研究剖析了轨道交通领域现阶段风险演化存在的问题与挑战,探究了未来研究趋势。研究可为安全生产中的风险防控理论体系构建及技术应用实践提供学术参考。 展开更多
关键词 风险演化 轨道交通 动态风险 图论 系统论 机器学习 仿真建模
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飞机着陆连续梁桥冲击系数研究
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作者 江辉 赵星燕 +4 位作者 孙耀宗 孟宪锋 李会驰 罗萌 季金文 《振动与冲击》 北大核心 2025年第3期140-149,170,共11页
为了填补当前国内外对飞机着陆跑道桥冲击系数研究的不足,对冲击系数的影响因素进行探究,并提出合理的冲击系数计算公式。首先,选取某机场五跨连续梁桥和民用飞机波音737-800为研究对象,基于有限元法和多体动力学法的联合仿真技术建立... 为了填补当前国内外对飞机着陆跑道桥冲击系数研究的不足,对冲击系数的影响因素进行探究,并提出合理的冲击系数计算公式。首先,选取某机场五跨连续梁桥和民用飞机波音737-800为研究对象,基于有限元法和多体动力学法的联合仿真技术建立了精细化的飞机-桥梁耦合振动分析系统;然后,研究飞机着陆质量、俯仰角、下沉速度及桥梁刚度、桥梁阻尼等因素对飞机着陆时桥梁冲击系数的影响,揭示了其内在规律及机理;最后,开展统计分析,明确了桥梁冲击系数的分布特征,并选取逐步线性回归分析方法,进一步提出了飞机着陆连续梁桥的冲击系数回归模型。研究结果表明:飞机着陆质量、下沉速度、接地速度、滚转角及桥梁刚度、桥梁阻尼是影响冲击系数的重要因素;当飞机在桥梁上着陆时,冲击系数服从极值Ⅰ型分布,主要分布区间为0.28~0.79,最高可达2.07;所建飞机着陆连续梁桥的冲击系数回归模型与数值仿真结果平均差异率为5.13%,回归模型的拟合效果良好,该模型对预测飞机着陆冲击作用下跑道桥的冲击系数具有一定参考价值。 展开更多
关键词 跑道桥 冲击系数 联合仿真 飞机-桥梁耦合模型 动力响应
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页岩气产能评价研究进展:内涵、方法和方向
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作者 朱苏阳 彭真 +3 位作者 邸云婷 彭小龙 刘东晨 官文洁 《油气藏评价与开发》 北大核心 2025年第3期488-499,共12页
页岩气的生产呈现早期高产而后快速递减的动态,快速递减表明初期配产可能过高,不合理配产导致气藏产能衰竭过快,从而影响气井的经济可采储量(EUR),因此,合理评价页岩气井产能对保障气藏稳产具有重要意义。为明确目前页岩气产能评价方法... 页岩气的生产呈现早期高产而后快速递减的动态,快速递减表明初期配产可能过高,不合理配产导致气藏产能衰竭过快,从而影响气井的经济可采储量(EUR),因此,合理评价页岩气井产能对保障气藏稳产具有重要意义。为明确目前页岩气产能评价方法存在的问题和相应的解决思路,研究分析了页岩气产能的特殊内涵,综述了产能流动方程解析、流动方程数值模拟、人工智能3种方法在页岩气产能评价研究中的进展。研究发现页岩气产能明显呈现出分阶段特征,不同生产阶段产能主控因素、流动机制、流动状态都不同,早期产能和后期产能的主控因素差异较大,不同评价方法存在差异化认识。其中,流动方程解析法依赖于对流动机理的认识程度,流动方程数值模拟法结果的验证需要大量可靠数据支撑和气藏工程经验判断,人工智能方法则存在高度不透明、不可解释和泛化能力差的问题。基于此,未来发展应从深化微观和宏观2个层面结合点的页岩气渗流机理着手研究,深化地质建模—应力物性演化—裂缝扩展—多相流动数值模拟—递减分析多维度产能描述融合,并加强机器学习算法的无关机理约束、因果推断的透明度、可解释程度,以规避现有产能评价方法存在的制约性,从而构建合理的页岩气产能评价模型和方法,为准确评价气井产能、实现稳产和高效开发提供理论支撑。 展开更多
关键词 页岩气 产能评价 流动方程解析法 流动方程数值模拟法 人工智能方法 动态评价
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