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| 1 | Formation reconfiguration in restricted three body problem显示文摘形成在太阳地球的一条光圈轨道附近飞的重构限制了三个身体系统与推动演习被调查。为短时间重构,二推动的演习与分析、数字的方法并且开始结束被调查()方法被证明是一精力最佳二推动的所有( TI )之一重构,和精力消费独立于主要太空船的位置,并且与重构时间减少。然后,基因算法被采用优化精力消费。结果证明最佳的精力与起始、最后的轨道之间的半径差别增加,并且与重构时间减少。 | Shengping Gong Junfeng Li Hexi Baoyin Yunfeng Gao | 2007 | Acta Mechanica Sinica2007，23，3： | 7 |
| 2 | Feasibility analysis of the angular momentum reversal trajectory via hodograph method for high performance solar sails显示文摘In this paper a new phase space of hodograph method is adopted to investigate and better understand the two-dimensional angular momentum reversal(H-reversal) trajectories for high performance solar sails within a fixed cone angle.As the hodograph method and the H-reversal trajectory are not very common,both of them are briefly introduced.The relationship between them are constructed and addressed with a sample trajectory.How the phase space varies according to the sail quality and the fixed sail cone angle is also studied.Through variation of the phase space,the minimum sail lightness number can be obtained by solving a set of algebraic equations instead of a parameter optimization problem.For a given sail lightness number,there are three types of the two-dimensional possible heliocentric motion,including the spiral inward trajectories towards the Sun,the H-reversal trajectories and the directly outward escape trajectories.The boundaries that separate these different groups are easily determined by using the phase space.Finally,the method and procedures to achieve the feasible region of the H-reversal trajectory with required perihelion distance are presented in detail. | ZENG XiangYuan BAOYIN HeXi LI JunFeng GONG ShengPing | 2011 | Science China(Technological Sciences)2011，54，11： | 3 |
| 3 | New applications of the H-reversal trajectory using solar sails显示文摘Advanced solar sailing has been an increasingly attractive propulsion system for highly non-Keplerian orbits.Three new applications of the orbital angular momentum reversal(H-reversal) trajectories using solar sails are presented:space observation,heliocentric orbit transfer and collision orbits with asteroids.A theoretical proof for the existence of double H-reversal trajectories(referred to as‘H2RTs’) is given,and the characteristics of the H2RTs are introduced before a discussion of the mission applications.A new family of H2RTs was obtained using a 3D dynamic model of the two-body frame.In a time-optimal control model,the minimum period H2RTs both inside and outside the ecliptic plane were examined using an ideal solar sail.Due to the quasi-heliostationary property at its two symmetrical aphelia,the H2RTs were deemed suitable for space observation.For the second application,the heliocentric transfer orbit was able to function as the time-optimal H-reversal trajectory,since its perihelion velocity is a circular or elliptic velocity.Such a transfer orbit can place the sailcraft into a clockwise orbit in the ecliptic plane,with a high inclination or displacement above or below the Sun.The third application of the H-reversal trajectory was simulated impacting an asteroid passing near Earth in a head-on collision.The collision point can be designed through selecting different perihelia or different launch windows.Sample orbits of each application were presented through numerical simulation.The results can serve as a reference for theoretical research and engineering design. | Xiang-Yuan Zeng Hexi Baoyin Jun-Feng Li Sheng-Ping Gong | 2011 | Research in Astronomy and Astrophysics2011，11，7： | 2 |
| 4 | Passive stability design for the solar sail on displaced orbits 显示文摘 | GONG Shengping LI Junfeng BAOYIN Hexi | 2007 | Journal of Spacecraft and Rockets2007，44，5： | 1 |
| 5 | Analysis of displaced solar sail orbits 显示文摘 | GONG Shengping LI Junfeng BAOYIN Hexi | 2008 | Journal of Guidance Control and Dynamics2008，31，3： | 1 |
| 6 | Trajectory optimization and applications using high performance solar sails显示文摘The high performance solar sail can enable fast missions to the outer solar system and produce exotic non-Keplerian orbits.As there is no fuel consumption,mission trajectories for solar sail spacecraft are typically optimized with respect to flight time.Several investigations focused on interstellar probe missions have been made,including optimal methods and new objective functions. Two modes of interstellar mission trajectories,namely 'direct flyby' and 'angular momentum reversal trajectory',are compare... | Xiangyuan Zeng,~(a)) Junfeng Li,~(b)) Hexi Baoyin,and Shengping Gong School of Aerospace,Tsinghua University,Beijing 100084,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，3： | 1 |
| 7 | Transfer trajectories design for a variable lightness solarcraft显示文摘 | Gong Shengping Li Junfeng Baoyin Hexi | | 0，，04： | 1 |
| 8 | A new solar sail orbit显示文摘Solar sail is used to achieve a geocentric sun-synchronous frozen orbit.This kind of orbit combines the characteristics of both sun-synchronous orbits and frozen orbits.Furthermore,the impossible orbits for a typical spacecraft such as sun-synchronous orbits whose inclination is less than 90° are also possible for solar sail.To achieve a sun-synchronous frozen orbit,the characteristic acceleration of the sail is chosen properly.In addition,the attitude of the sail is adjusted to keep the sun-synchronous and frozen characteristics.The perturbations including atmosphere drag,third-body gravitational forces and shaded regions are discussed,where the atmosphere drag is cancelled by solar radiation pressure force,third-body gravitational forces have negligible effects on the orbit and the shaded region can be avoided by choosing the classical orbit elements of the sail.At last,a numerical example is employed to validate the sun-synchronous frozen characteristics of the sail. | GONG ShengPing LI JunFeng BAOYIN HeXi SIMO Jules | 2012 | Science China(Technological Sciences)2012，55，3： | 1 |
| 9 | New nonlinear stiffness actuator with predefined torque‒deflection profile显示文摘A nonlinear stiffness actuator(NSA)could achieve high torque/force resolution in low stiffness range and high bandwidth in high stiffness range,both of which are beneficial for physical interaction between a robot and the environment.Currently,most of NSAs are complex and hardly used for engineering.In this paper,oriented to engineering applications,a new simple NSA was proposed,mainly including leaf springs and especially designed cams,which could perform a predefined relationship between torque and deflection.The new NSA has a compact structure,and it is lightweight,both of which are also beneficial for its practical application.An analytical methodology that maps the predefined relationship between torque and deflection to the profile of the cam was developed.The optimal parameters of the structure were given by analyzing the weight of the NSA and the mechanic characteristic of the leaf spring.Though sliding friction force is inevitable because no rollers were used in the cam-based mechanism,the sliding displacement between the cam and the leaf spring is very small,and consumption of sliding friction force is very low.Simulations of different torque‒deflection profiles were carried out to verify the accuracy and applicability of performing predefined torque‒deflection profiles.Three kinds of prototype experiments,including verification experiment of the predefined torque‒deflection profile,torque tracking experiment,and position tracking experiment under different loads,were conducted.The results prove the accuracy of performing the predefined torque‒deflection profile,the tracking performance,and the interactive performance of the new NSA. | Wenjie JU Hexi GONG Keke QI Rongjie KANG Jian SDAI Zhibin SONG | 2023 | Frontiers of Mechanical Engineering2023，18，1： | 0 |
| 10 | Solar sail attitude control using shape variation of booms显示文摘Active attitude control of solar sails is required to control the direction of the force generated by Solar Radiation Pressure(SRP). It is desirable to control the attitude through propellantfree means. This paper proposes a new method for attitude control of solar sails: A boom consisting of 'smart' structural material can be deformed by the piezoelectric actuator, and Solar Radiation Pressure torque will be generated due to shape variation of sail membrane caused by boom deformation. The method has the advantages of simple structure, small disturbance and small additional load, and is not limited by the size of the solar sail. The case of rendezvous with the Asteroid 2000SG344 is used to verify the attitude control around the pitch and yaw axes. | Feng ZHANG Shengping GONG Haoran GONG Hexi BAOYIN | 2022 | Chinese Journal of Aeronautics2022，35，10： | 0 |
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