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Optimal Spacecraft Rendezvous with PNG
Hiroyuki Takano,Mini Matsuda,Takeshi Yamasaki,Isao Yamaguchi 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Recently, along with International Space Station, many rendezvous are carried out around the earth. Some of them are unmanned space freights and require automatic rendezvous procedure. In this paper, spacecraft rendezvous with input time-lag system are formulated as nonlinear programming problems based on the proportional navigation guidance (PNG) and numerically analyzed. The optimal solutions were obtained for several objectives. The problem of choice of the navigation constant that provides minimizing rendezvous time and control effort is analyzed. The results of computer simulation are given.
Hiroyuki Toyoda,Takahiro Takano,Tomoyuki Akita,Toru Watanabe,Kazuto Seto 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
A novel combination of structures for connected-control mechanism (CCM) has been presented. By coupling base-isolated and ordinary structures, the vibration suppression effect of CCM is expected to be expanded. Experimental structures and CCM mechanism using magnetic dampers were built and excitation experiments were carried out. In the previous study, however, the achieved vibration suppression performance was not satisfactory. In study, to enhance the performance, spring elements are introduced. The spring constants are tuned according to so-called “fixed-point theory” The performance of the designed system is investigated experimentally.
Connected Control Method for Four High-Rise Buildings Possessing Equal Height
Takahiro Takano,Tomoyuki Akita,Hiroyuki Toyoda,Toru Watanabe,Kazuto Seto 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
The connected control method (CCM) utilized reaction force between buildings as damping force by using connecting springs and dampers. The effectiveness of CCM has already been established in previous studies. In this paper, bidirectional internal connected control method (BICCM) with an experimental high-rise building split into four substructures is presented for a vibration control method to mitigate structural vibration by using internal damping force by CCM. Therefore, IBCCM is expected that is effective method for a high-rise building against large earthquake excitation. In this report, the effectiveness BICCM is investigated through computer simulations
Flow Patterns in Green Bodies Made by High-Speed Centrifugal Compaction Process
Suzuki Hiroyuki Y.,Urabe Katsuaki,Takano Tomoki,Kuroki Hidenori 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
High-Speed Centrifugal Compaction Process (HCP) is a wet compacting method, in which powders are compacted under a huge centrifugal force. The HCP was well applied to small alumina specimens, but the compact easily cracked when we applied the HCP to other materials. We clarified how the cracks introduced and found that the formation of such a flow pattern was related to the Colioli's force in the centrifugal field.
A note on the Trajectory Optimization of a Rigid body aircraft
Osuga Hideyo,Takano Hiroyuki,Yamasaki Takeshi,Baba Yoriaki 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
Recently, the stability and performance of the aircraft are developed in many aspects, for example, new materials, new structures, wings like the supercritical wings or the winglets, engines like the scram engines or the TVC and many control methods using computers and fly-by-wire technology, etc. Therefore, those aircraft can fly on new trajectories which used to be impossible before. These maneuvers are totally new both for pilots and engineers and should be studied to know how to fly and which abilities are required to carry out such maneuvers very well. In this paper, we formulate the vertical maneuvers of a rigid body aircraft having the post stall maneuverability with the thrust vector control as optimal trajectory problems and analyzed them with the non-linear programming. We chose the night time as the performance index and solve it as a minimum time problem. Furthermore, on the phenomenon that occurred in this analysis, we tried to reduce the number of the variables by removing one control.
Collision Avoidance of the Aircraft in the 3 Dimensional Space
Yoshihiro Yamaguchi,Hiroyuki Takano,Takeshi Yamasaki,Isao Yamaguchi 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Recently, domestic and overseas LCC’s (Low Cost Carriers) increase air-traffic in Japan. However, we have narrow domain and many airports. Large training areas of USAF or JSDF also exist in the airspace. In the present circumstances, the flight safety is kept by separating airways from training areas. In the near future, increasing number of flights will make severe situation. In this paper, we try to optimize the evasive courses of aircraft in the narrow airspace. We formulate collision avoidance as a nonlinear programming problem and analyzed numerically. The optimal solution we obtained show courses in narrower spaces than ordinary ones. The assumption of limited airspaces is useful in severe situation like bad weather. Thus, this study might be a good proposal to decide direction for collision avoidance.