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Survey of autonomous guidance methods for powered planetary landing Review

Zheng-yu Song, Cong Wang, Stephan Theil, David Seelbinder, Marco Sagliano, Xin-fu Liu, Zhi-jiang Shao,zycalt12@sina.com

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 5,   Pages 649-808 doi: 10.1631/FITEE.1900458

Abstract: This paper summarizes the s (AGMs) for on celestial surfaces. We first review the development of guidance methods, focusing on their contributions for dealing with constraints and enhancing computational efficiency. With the increasing demand for reusable launchers and more scientific returns from space exploration, has become a basic requirement. Unlike the kilometer-level precision for previous activities, the position accuracy of future planetary landers is within tens of meters of a target respecting all constraints of velocity and attitude, which is a very difficult task and arouses renewed interest in AGMs. This paper states the generalized three- and six-degree-of-freedom optimization problems in the phase and compares the features of three typical scenarios, i.e., the lunar, Mars, and Earth landing. On this basis, the paper details the characteristics and adaptability of AGMs by comparing aspects of analytical guidance methods, numerical optimization algorithms, and learning-based methods, and discusses the convexification treatment and solution strategies for non-convex problems. Three key issues related to AGM application, including physical feasibility, model accuracy, and real-time performance, are presented afterward for discussion. Many space organizations, such as those in the United States, China, France, Germany, and Japan, have also developed free-flying demonstrators to carry out related research. The guidance methods which have been tested on these demonstrators are briefly introduced at the end of the paper.

Keywords： 自主制导方法；定点软着陆；动力下降；非线性规划    

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Study on Down Knock-in Renewal Option Pricing

Wu Yun,He Jianmin

Strategic Study of CAE 2004, Volume 6, Issue 12,   Pages 47-50

Abstract:

In this paper, firstly, the basic connotation of modern leasing and the basic principle of real option are dissertated. Then, the down knock-in renewal option pricing model and its solution are put forward. At last, example is provided.

Keywords： leasing     renewal     leasing option     real option     down knock-in option    

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Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method Research Articles

Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6,   Pages 809-962 doi: 10.1631/FITEE.1900593

Abstract: We introduce the fractional-order global optimal backpropagation machine, which is trained by an improved (FSDM). This is a fractional-order backpropagation neural network (FBPNN), a state-of-the-art fractional-order branch of the family of backpropagation neural networks (BPNNs), different from the majority of the previous classic first-order BPNNs which are trained by the traditional first-order steepest descent method. The reverse incremental search of the proposed FBPNN is in the negative directions of the approximate fractional-order partial derivatives of the square error. First, the theoretical concept of an FBPNN trained by an improved FSDM is described mathematically. Then, the mathematical proof of fractional-order global optimal convergence, an assumption of the structure, and of the FBPNN are analyzed in detail. Finally, we perform three (types of) experiments to compare the performances of an FBPNN and a classic first-order BPNN, i.e., example function approximation, , and comparison of global search and error fitting abilities with real data. The higher optimal search ability of an FBPNN to determine the global optimal solution is the major advantage that makes the FBPNN superior to a classic first-order BPNN.

Keywords： 分数阶微积分；分数阶反向传播算法；分数阶最速下降法；均方误差；分数阶多尺度全局优化    

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Crossing “Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Strategic Study of CAE 2003, Volume 5, Issue 12,   Pages 36-42

Abstract:

The curve of environmental impact in the process of economic growth in developed countries was likened to “environmental mountain”. For developing countries, particularly China, the right way of economic development is going through the “environmental mountain” on the halfway up the mountain - a new way for industrialization. The formulas of the relationship between environmental impact and GDP were derived, in which there are 2 key variables： g—growth rate of GDP; t—decreasing rate of environmental impact per unit GDP. Taking several countries and provinces in China as examples, the relationships between economic growth and energy consumption were studied. The environmental impacts of China in the years 2005, 2010 and 2020 were anticipated under different assumptions, and further discussion was given in terms of energy consumption.

Keywords： “environmental mountain”     environmental impact     growth rate of GDP     environmental impact per unit GDP     decreasing rate of environmental impact per unit GDP    

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A descent method for the Dubins traveling salesman problem with neighborhoods Research Articles

Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.2000041

Abstract: In this study, we focus mainly on the problem of finding the minimum-length path through a set of circular regions by a fixed-wing unmanned aerial vehicle. Such a problem is referred to as the with neighborhoods (DTSPN). Algorithms developed in the literature for solving DTSPN either are computationally demanding or generate low-quality solutions. To achieve a better trade-off between solution quality and computational cost, an efficient gradient-free is designed. The core idea of the is to decompose DTSPN into a series of subproblems, each of which consists of finding the minimum-length path of a from a configuration to another configuration via an intermediate circular region. By analyzing the geometric properties of the subproblems, we use a bisection method to solve the subproblems. As a result, the can efficiently address DTSPN by successively solving a series of subproblems. Finally, several numerical experiments are carried out to demonstrate the in comparison with several existing algorithms.

Keywords： Dubins飞行器；坐标下降法；Dubins旅行商问题    

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Global CO2 Emissions Level Off in 2019, with a Drop Predicted in 2020

Sean O’Neill

Engineering 2020, Volume 6, Issue 9,   Pages 958-959 doi: 10.1016/j.eng.2020.07.005

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Fluid-Aerodynamics Performance Investigation of Dynamic Air Cushion Wing-in-ground Effect Craft

Yun Liang,Wu Chengjie,Xie Younong

Strategic Study of CAE 2000, Volume 2, Issue 4,   Pages 48-52

Abstract:

The features and difficulties of the craft design as well as the experimental investigation of DACWIG (Dynamic Air Cushion Wing-in-ground Effect Craft) are described in this paper. Both model and full scale craft tests demonstrated that the static hovering characteristics, powering performance, seakeeping quality and aerodynamics balance as well as transverse and longitudinal stability of the craft were satisfied, due to taking a series measures in the craft design. So DACWIG has prospective future in both civilian and military use.

Keywords： dynamic air cushion     wing in ground effect craft     performance    

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Research on Aero Engine Empower Development Strategy

Xiang Qiao, Huang Jindong, Hu Xiaoyu, Yan Wuying, Hou Wei

Strategic Study of CAE 2022, Volume 24, Issue 2,   Pages 106-112 doi: 10.15302/J-SSCAE-2022.02.013

Abstract:

Aero engine is crucial for aircraft and its development level reflects a country's comprehensive strength, industrial base, and scientific and technological level. Studying strategies for strengthening the aero engine development in China is significant for technological innovation and high-quality development of China's manufacturing industry. In this study, we explore the significance for strengthening the aero engine development from the aspects of promoting national competitiveness, green development, and innovation-driven development, and summarize the experience of developed countries in aero engine development. Subsequently, we summarize the development status of China's aero engine industry, analyze the challenges urgently faced by the industry, and propose the connotation, objectives, and specific development path of the strategy in terms of advanced products, major infrastructure, common key technologies, and basic research. Furthermore, we propose the following suggestions to promote the high-quality development of China's aero engine industry: improving the policy and regulation systems, deepening industry system reforms, optimizing the industry operation mechanism, and improving the talents training system.

Keywords： aero engine     engine development     power strengthening     equipment manufacturing    

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Tests and analyses for the characteristic parameters of rock dynamics in Samen Nuclear Power Plant, Zhejiang Province

Li Xuanjun

Strategic Study of CAE 2010, Volume 12, Issue 2,   Pages 27-31

Abstract:

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    

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Experimental investigation on dynamic response ofchamber to simulate deepwater explosive

Zhong Dongwang,Li Linna

Strategic Study of CAE 2014, Volume 16, Issue 11,   Pages 78-81

Abstract:

Experimental investigation was conducted for the dynamic response of a real spherical explosive chamber that can simulate 200m deepwater explosive loaded 10gTNT equivalent．The vibration characteristics and dynamic strength of the chamber was analyzed by measuring the strain profiles of six typical points on the chamber．The research results reveal the rule of the dynamic response of the container on different explosive load and static pressure．It provides reference for the design and development of the vessel to simulate deepwater explosion.

Keywords： deepwater explosive     explosive chamber     dynamic response     strain    

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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

Abstract:

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    

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Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies Research Article

Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10,   Pages 1390-1403 doi: 10.1631/FITEE.1900341

Abstract: The era of big data in healthcare is here, and this era will significantly improve medicine and especially oncology. However, traditional machine learning algorithms need to be promoted to solve such large-scale real-world problems due to a large amount of data that needs to be analyzed and the difficulty in solving problems with nonconvex nonlinear settings. We aim to minimize the composite of a smooth nonlinear function and a block-separable nonconvex function on a large number of block variables with inequality constraints. We propose a novel parallel first-order optimization method, called asynchronous block coordinate descent with (ATP), which adopts a technique that escapes from saddle points and sub-optimal local points. The details of the proposed method are presented with analyses of convergence and iteration complexity properties. Experiments conducted on real-world machine learning problems validate the efficacy of our proposed method. The experimental results demonstrate that enables ATP to escape from saddle points and sub-optimal points, providing a promising way to handle nonconvex optimization problems with inequality constraints employing asynchronous block coordinate descent. The asynchronous parallel implementation on shared memory multi-core platforms indicates that the proposed algorithm, ATP, has strong scalability.

Keywords： 收敛分析；异步块坐标下降法；时间扰动；非凸非平滑优化；真实世界研究    

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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

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Development Status and Prospect of Marine Nuclear Power Equipment in China and Abroad

Zheng Jie,Yu Fan,Zhu Junmin,Liu Cungen, Wang Xinyue,Zhu Yingfu

Strategic Study of CAE 2023, Volume 25, Issue 3,   Pages 62-73 doi: 10.15302/J-SSCAE-2023.03.007

Abstract:

Marine nuclear power equipment (MNPE) is crucial for the sustainable energy supply and carbon emission reduction during deep-sea resource exploitation. However, China has not achieved breakthroughs in the field of civil MNPE, although it has a good foundation in the nuclear and marine equipment industries. Based on the research of MNPE development practices in China and abroad, this study summarizes the advantages and technical sources of MNPE, analyzes future application scenarios and development trends, clarifies the strategic demand and problems of MNPE development in China, and proposes several development suggestions. Currently, MNPE is extending from military to civil use and from land to sea, and its main technical source is compact and integrated pressurized water reactors. In the near future, the equipment types of MNPE will focus on offshore floating nuclear power plants and nuclear-powered icebreakers. To promote the high-quality development of MNPE, it is necessary to clarify the major application scenarios of MNPE in China through top-level planning, formulate regulations, specifications, and supervisory systems through demonstration projects to match with practical development demands, and achieve breakthroughs regarding key technologies such as the construction of marine reactor systems and nuclear power platform assemblies.

Keywords： marine nuclear power equipment     small modular reactors     pressurized water reactors     nuclear power ships     offshore floating nuclear power plants    

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Study on dynamics of coupled systems in high-speed trains

Zhang Weihua

Strategic Study of CAE 2015, Volume 17, Issue 4,   Pages 42-52

Abstract:

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    

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Title Author Date Type Operation

Survey of autonomous guidance methods for powered planetary landing

Zheng-yu Song, Cong Wang, Stephan Theil, David Seelbinder, Marco Sagliano, Xin-fu Liu, Zhi-jiang Shao,zycalt12@sina.com

Journal Article

Study on Down Knock-in Renewal Option Pricing

Wu Yun,He Jianmin

Journal Article

Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method

Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn

Journal Article

Crossing “Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Journal Article

A descent method for the Dubins traveling salesman problem with neighborhoods

Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn

Journal Article

Global CO2 Emissions Level Off in 2019, with a Drop Predicted in 2020

Sean O’Neill

Journal Article

Fluid-Aerodynamics Performance Investigation of Dynamic Air Cushion Wing-in-ground Effect Craft

Yun Liang,Wu Chengjie,Xie Younong

Journal Article

Research on Aero Engine Empower Development Strategy

Xiang Qiao, Huang Jindong, Hu Xiaoyu, Yan Wuying, Hou Wei

Journal Article

Tests and analyses for the characteristic parameters of rock dynamics in Samen Nuclear Power Plant, Zhejiang Province

Li Xuanjun

Journal Article

Experimental investigation on dynamic response ofchamber to simulate deepwater explosive

Zhong Dongwang,Li Linna

Journal Article

Tire Dynamics Collaborative Development Strategy

Guo Konghui,Lu Dang and Wu Haidong

Journal Article

Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies

Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn

Journal Article

The Statics, Dynamics, and Aerodynamics of Long-Span Bridges

Yeong-Bin Yang, Yaojun Ge

Journal Article

Development Status and Prospect of Marine Nuclear Power Equipment in China and Abroad

Zheng Jie,Yu Fan,Zhu Junmin,Liu Cungen, Wang Xinyue,Zhu Yingfu

Journal Article

Study on dynamics of coupled systems in high-speed trains

Zhang Weihua

Journal Article