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Complete coverage path planning for an Arnold system based mobile robot to perform specific types of Regular Article
Cai-hong Li, Chun Fang, Feng-ying Wang, Bin Xia, Yong Song,lich@sdut.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 11, Pages 1530-1542 doi: 10.1631/FITEE.1800616
Keywords： 混沌机器人；Arnold动力学系统；压缩变换；全覆盖遍历路径；候选集
Launch dynamics of multibody system and its applications
Rui Xiaoting
Strategic Study of CAE 2011, Volume 13, Issue 10, Pages 76-82
Bad firing precision, huge consumption of projectiles in test and launch unsafety are the three difficult technology problems constraining the development of modern rockets and gun weapons. Firing precision and the launch safety of weapon system depend on dynamics style of weapon system. As a engineering subject of multidisciplinary approach studying the motion styles of weapon system and the force acting on it during launch process, launch dynamics has been a new technological breakthrough in improving firing precision and launch safety of rockets and gun weapon system in the world, provided new theory and technology for design and test of firing precision and launch safety. In this paper, theory and technology of launch dynamics of multibody system and its applications in design and test of firing precision and safety for rockets and gun weapons are studied.
Keywords： firing precision consumption of projectile in test launch safety launch dynamics of multibody system transfer matrix method of multibody system
Study on dynamics of coupled systems in high-speed trains
Zhang Weihua
Strategic Study of CAE 2015, Volume 17, Issue 4, Pages 42-52
According to the structure and technical features of high-speed railway， the high-speed train， rail line， air flow， power supply and catenary which are relevant to the high-speed train and have an effect on the dynamic behavior of the high-speed train are coupled as a unified system. The dynamic model of coupled systems in high-speed trains are created by establishing the dynamic models of high-speed train， rail line， pantograph-catenary and power supply and the coupled interaction models of wheel-rail， pantograph-catenary， liquid-solid and electro-mechanical. For the high speed train operation simulation requirements， this paper studied the train dynamics modeling and calculation method based on cyclic variable parameters method， the train-line coupled calculation method based on the slip model and the liquid-solid coupled calculation method based on the relaxation factor. the simulation of coupled systems in high-speed trains are realized. [Key words] high-speed train； service performance； train detection； tracking test； performance evolution
Keywords： high-speed train； service performance； train detection； tracking test； performance evolution
A Spatial–Temporal Network Perspective for the Propagation Dynamics of Air Traffic Delays Article
Qing Cai, Sameer Alam, Vu N. Duong
Engineering 2021, Volume 7, Issue 4, Pages 452-464 doi: 10.1016/j.eng.2020.05.027
Intractable delays occur in air traffic due to the imbalance between ever-increasing air traffic demand and limited airspace capacity. As air traffic is associated with complex air transport systems, delays can be magnified and propagated throughout these systems, resulting in the emergent behavior known as delay propagation. An understanding of delay propagation dynamics is pertinent to modern air traffic management. In this work, we present a complex network perspective of delay propagation dynamics. Specifically, we model air traffic scenarios using spatial-temporal networks with airports as the nodes. To establish the dynamic edges between the nodes, we develop a delay propagation method and apply it to a given set of air traffic schedules. Based on the constructed spatial–temporal networks, we suggest three metrics—magnitude, severity, and speed—to gauge delay propagation dynamics. To validate the effectiveness of the proposed method, we carry out case studies on domestic flights in the Southeastern Asia region (SAR) and the United States. Experiments demonstrate that the propagation magnitude in terms of the number of flights affected by delay propagation and the amount of propagated delays for the US traffic are respectively five and ten times those of the SAR. Experiments further reveal that the propagation speed for US traffic is eight times faster than that of the SAR. The delay propagation dynamics reveal that about six hub airports in the SAR have significant propagated delays, while the situation in the United States is considerably worse, with a corresponding number of around 16. This work provides a potent tool for tracing the evolution of air traffic delays.
Keywords： Air traffic Transport systems Delay propagation dynamics Spatial–temporal networks
Evaluation of water resources carrying capacity in Wuhan City based on system dynamics simulation
Chen Wei and Zhou Cheng
Strategic Study of CAE 2014, Volume 16, Issue 3, Pages 103-107
Water resources carrying capacity has a vital influence on the economic growth and social progress in a country or region，it’s a hotspot of research on water between science and system science. Taking Wuhan City for example，combine thewater resources subsystem，economic subsystem，social subsystem，the ecological environment subsystem and water pollution subsystem by using the system dynamic model，build the simulation model，then make comprehensive analysis of the obtained parameter values by osculation value method. In the end，received overall best solution in the process of implementation of“national economic and social development of wuhan city twelfth five-year program”.
Keywords： water resources carrying capacity osculation value method system dynamics evaluation
Dvelopment of Aeronautics and Astronautics With Mechanics
Chen Shilu
Strategic Study of CAE 2003, Volume 5, Issue 3, Pages 25-26
This paper discusses the development of aeronautics and astronautics with mechanics, reveals the development of new branches of interconnected sciences in mechanics, describes the relations of flight mechanics with aerodynamics, structure mechanics, general mechanics and automatic control, and introduces the new branch of flight mechanics—flight dynamics of elastic vehicle.
Keywords： aerodynamics structure mechanics general mechanics automatic control flight mechanics flight dynamics of elastic vehicles
The Statics, Dynamics, and Aerodynamics of Long-Span Bridges
Yeong-Bin Yang, Yaojun Ge
Engineering 2017, Volume 3, Issue 6, doi: 10.1016/j.eng.2017.12.005
Li Xuanjun
Strategic Study of CAE 2010, Volume 12, Issue 2, Pages 27-31
The properties of rock dynamics under the commercial nuclear reactor foundation are very important Parameters in ascismic design. The properties of rock dynamics and test method under earthquake loading are analyzed in this paper. From this, the dynamic elastic modulus, poisson' ratio, shear modulus, and triaxial pressure strength of 4 kinds of rock (tuff, tuff sandstone, felsophyre, rhyolite porphyry) have been given by using the RDT-10000 high Pressure triaxial machine. These parameters have been used in the feasibility report and the aseismic design of the Sanmen Nuclear Power Plant.
Keywords： nuclear island rock dynamics test
Tire Dynamics Collaborative Development Strategy
Guo Konghui,Lu Dang and Wu Haidong
Strategic Study of CAE 2018, Volume 20, Issue 1, Pages 91-96 doi: 10.15302/J-SSCAE-2018.01.013
Tire dynamics is an important bottleneck in the autonomous development of automobiles and aircraft. This study compares the development of tire dynamics both nationally and in other nations, and indicates a significant challenge in the development of tire dynamics in China in the face of an increasingly fierce international competition. The strategies and suggestions for the collaborative development of tire dynamics in China are proposed after analyzing the characteristics of the tire dynamics test, simulation, and application technology.
Keywords： tire dynamics automobile airplane collaborative development strategy
The non-isothermal crystallization kinetics analysis of polypropylene based wood plastic composite
Huang Lang,Wang Haigang and Wang Qingwen
Strategic Study of CAE 2014, Volume 16, Issue 4, Pages 21-24
The polypropylene (PP) based wood plastic composite (WPC) was prepared by compress method，and the non- isothermal crystallization kinetics of the composite was characterized by differential scanning calorimetry，the Jeziorny method and Mo method were used to analyze the non-isothermal crystallization kinetics and the results showed that both of the methods can work well on the composite，the wood flour can improve the peak temperature of crystallization and decrease the crystallization time of the PP based WPC .
Keywords： PP WPC the non-isothermal crystallization crystallization kinetics
Dongdong Gu, Chenglong Ma, Mujian Xia, Donghua Dai, Qimin Shi
Engineering 2017, Volume 3, Issue 5, Pages 675-684 doi: 10.1016/J.ENG.2017.05.011
Selective laser melting (SLM) additive manufacturing (AM) technology has become an important option for the precise manufacturing of complex-shaped metallic parts with high performance. The SLM AM process involves complicated physicochemical phenomena, thermodynamic behavior, and phase transformation as a high-energy laser beam melts loose powder particles. This paper provides multiscale modeling and coordinated control for the SLM of metallic materials including an aluminum (Al)-based alloy (AlSi10Mg), a nickel (Ni)-based super-alloy (Inconel 718), and ceramic particle-reinforced Al-based and Ni-based composites. The migration and distribution mechanisms of aluminium nitride (AlN) particles in SLM-processed Al-based nanocomposites and the in situ formation of a gradient interface between the reinforcement and the matrix in SLM-processed tungsten carbide (WC)/Inconel 718 composites were studied in the microscale. The laser absorption and melting/densification behaviors of AlSi10Mg and Inconel 718 alloy powder were disclosed in the mesoscale. Finally, the stress development during line-by-line localized laser scanning and the parameter-dependent control methods for the deformation of SLM-processed composites were proposed in the macroscale. Multiscale numerical simulation and experimental verification methods are beneficial in monitoring the complicated powder-laser interaction, heat and mass transfer behavior, and microstructural and mechanical properties development during the SLM AM process.
Keywords： Additive manufacturing Selective laser melting Multiscale modeling Thermodynamics Kinetics
Dynamic Simulation and Optimization of Rubber Suspension System of Articulated Dump Truck
Xu Zhihua,Sun Qinghong,Sun Beibei,Ma Zhu ,Li Suoyun ,Wang Huajun
Strategic Study of CAE 2005, Volume 7, Issue 9, Pages 34-39
Virtual prototyping technology has been used to analyze the dynamic characteristics of rubber spring suspension of AD250 articulated dump truck. Multi-body dynamics simulation of the ride comfort has been performed under different velocity and different load. The results of analysis are consistent with experiment results, which shows the correctness of the model. Results indicate that the good and constant ride comfort can be satisfied under different load because of the nonlinear properties of rubber springs of front suspension. Rear suspension system under light load has higher supporting frequency than under deadweight. The results provide a basis for the parameter optimization of rubber spring suspension.
Keywords： articulated dump trucks suspension rubber spring dynamics nonlinear
Die Hu, Shaoshi Yang, Min Gong, Zhiyong Feng, Xuejun Zhu
Engineering 2022, Volume 19, Issue 12, Pages 217-227 doi: 10.1016/j.eng.2021.10.022
As a special type of mobile ad hoc network (MANET), the flying ad hoc network (FANET) has the potential to enable a variety of emerging applications in both civilian wireless communications (e.g., 5G and 6G) and the defense industry. The routing protocol plays a pivotal role in FANET. However, when designing the routing protocol for FANET, it is conventionally assumed that the aerial nodes move randomly. This is clearly inappropriate for a mission-oriented FANET (MO-FANET), in which the aerial nodes typically move toward a given destination from given departure point(s), possibly along a roughly deterministic flight path while maintaining a well-established formation, in order to carry out certain missions. In this paper, a novel cyber-physical routing protocol exploiting the particular mobility pattern of an MO-FANET is proposed based on cross-disciplinary integration, which makes full use of the mission-determined trajectory dynamics to construct the time sequence of rejoining and separating, as well as the adjacency matrix for each node, as prior information. Compared with the existing representative routing protocols used in FANETs, our protocol achieves a higher packet-delivery ratio (PDR) at the cost of even lower overhead and lower average end-to-end latency, while maintaining a reasonably moderate and stable network jitter, as demonstrated by extensive ns-3-based simulations assuming realistic configurations in an MO-FANET.
Keywords： Cyber-physical system Flying ad hoc network (FANET) Routing protocol Trajectory dynamics Unmanned aerial vehicle (UAV)
Dynamics Modeling of Spacecraft with Composite Flexible Structures
Qu Guangji,Cheng Daosheng
Strategic Study of CAE 1999, Volume 1, Issue 2, Pages 52-56
It is a conventional method to build dynamic models of flexible spacecraft with hybrid coordinates. This kind of modeling has gotten a great success both in theory and practice to spacecraft with rigid main body and large flexible appendages. However, modern spacecraft are becoming much bigger and more and more complicated. Their developing trend in structure is： 1. Rigid main body is attached by flexible module, to which kinds of large flexible appendages are fixed. This kind of spacecraft is a complicated structure system composed of rigid main body and composite flexible structures; 2. The flexible multi-modules main body, taking on a lower stiffness, and several kinds of large flexible appendages attached to it make the whole spacecraft as an all-flexible structure system.
It is impossible to build the dynamic equations of a spacecraft by its flexible modes, when some of its flexible appendages are not fixed to the rigid main body directly. In order to take full advantage of the achievement of spacecraft dynamics of rigid main body with flexible appendages, this paper makes dynamic models of composite flexible structure spacecraft by hybrid coordinates with taking into consideration the composite transition of linking point between flexible bodies. The corresponding computing software DASFA 2.0 has been used in space engineering design and analysis.
Keywords： spacecraft composite flexible structure dynamics of flexible structures hybrid coordinate method
Hu Dongsheng,Zhang Huajing,Xu Bing,Tian Xinhong and Zhang Guowei
Strategic Study of CAE 2007, Volume 9, Issue 12, Pages 31-38
Keywords： the remote sensing image explanation of earth satellite the basic type of structure system the evolutional process of geology environment the earth dynamics mechanism Korean Peninsula
Title Author Date Type Operation
Complete coverage path planning for an Arnold system based mobile robot to perform specific types of
Cai-hong Li, Chun Fang, Feng-ying Wang, Bin Xia, Yong Song,lich@sdut.edu.cn
Journal Article
A Spatial–Temporal Network Perspective for the Propagation Dynamics of Air Traffic Delays
Qing Cai, Sameer Alam, Vu N. Duong
Journal Article
Evaluation of water resources carrying capacity in Wuhan City based on system dynamics simulation
Chen Wei and Zhou Cheng
Journal Article
The Statics, Dynamics, and Aerodynamics of Long-Span Bridges
Yeong-Bin Yang, Yaojun Ge
Journal Article
Tests and analyses for the characteristic parameters of rock dynamics in Samen Nuclear Power Plant, Zhejiang Province
Li Xuanjun
Journal Article
The non-isothermal crystallization kinetics analysis of polypropylene based wood plastic composite
Huang Lang,Wang Haigang and Wang Qingwen
Journal Article
A Multiscale Understanding of the Thermodynamic and Kinetic Mechanisms of Laser Additive Manufacturing
Dongdong Gu, Chenglong Ma, Mujian Xia, Donghua Dai, Qimin Shi
Journal Article
Dynamic Simulation and Optimization of Rubber Suspension System of Articulated Dump Truck
Xu Zhihua,Sun Qinghong,Sun Beibei,Ma Zhu ,Li Suoyun ,Wang Huajun
Journal Article
A Cyber-Physical Routing Protocol Exploiting Trajectory Dynamics for Mission-Oriented Flying Ad Hoc Networks
Die Hu, Shaoshi Yang, Min Gong, Zhiyong Feng, Xuejun Zhu
Journal Article
Dynamics Modeling of Spacecraft with Composite Flexible Structures
Qu Guangji,Cheng Daosheng
Journal Article
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