List of Dissertation Abstract
Name

Supervisor（Environment and System Sciences System Design Course）

Title

Abstract

This paper discusses on the establishment of area evaluation method for descent trajectory to mitigate
Study on Area Evaluation Method
Fuka AMANO

Takehirofor Mitigation of Aircraft NoiseHIGUCHI

Disturbance in Descending
Trajectories

aircraft noise. The features of this new method are area evaluation and analytic solution. This method
is established by a polar coordinates. The size of circle area that is over the standard noise value varywith flight altitude. By establishment of this new method, three results are achieved. First, aircraft
noise value in the whole area is mitigated. Second, it is possible to set the specific area that needs tomitigate particularly in the evaluation area. Third, optimal trajectory is varied depending on flight
altitude. This paper shows the availability of the method to simulate for actual operations.

This study treats the eﬀect of a universal joint placed between an airframe and a propulsion unit. In
Study on Guidance Control of
Kohei ARAI

Seiya UENO

Parallel Ducted Fan Type VTOL
Aircraft with Universal Joint
Coupling

order to analyze the control performance by the joint, some control systems are developed.
Especially, the attitude controllers are basic and inﬂuential for position control and velocity control.
The attitude controllers utilize the pole assignments for the stabilization, however, in the case of
specializing in the propulsion unit, the zeros aﬀect the stability. According to the result of thesimulations, the universal joint could enable the following eﬀects: reduction of the inverse responses,
improvement of the convergence, and reduction of the required force.

Neural network referencing the human brain has abilities of learning and nonlinear mapping. It has
been applied in many fields such as recognition, identification and control for these abilities.
Taichiro ISHII

Shin

Structural Characteristics andGenerally, back propagation method is used for learning in feedforward neural network. However,

MORISHIT

Performance Evaluation of Self-some learning tasks have not been well trained by this method. In this study, the leaning algorithm withA

organizing Neural Networkchanging its network structure is proposed. The rule of self-organization is based on the characteristics
of complex network which has attracted attention in recent years. The ability of proposed algorithm
was evaluated by learning two-spiral problem.

In this study, the microscopic process of ductile failure is studied by using the multi-scaleMulti-scale Simulation for
Shingo INAMI

Takahiro

Microscopis Voids

YAMADA

Initiation/Growth Process in
Ductile Failures

simulation based on the mathematical homogenization method. According to the conceptof damage is widely accepted for the continuum damage mechanics, failure process ofmetals is mainly governed by their microscopic voids. This study tries to simulate theprocess of void initiation and growth in microstructures, and shows some typical multiscale simulations in which the macroscopic softening behaviors are related to theirmicroscopic deformations.
In this study I examined phase difference so that one of the problems of the mooring. I am told that

Study on a Distribution of a
Yuta INOUE

MotohikoTension along a Catenary Type

MURAI

Mooring Line for a
Floating Body in a Test Tankphase differences between mooring tension and floating body exercise have an influence on the
floating body control. I inspected this using a water tank experiment and numerical computation. I
confirmed that I changed by a thing, the depth of the water that a phase difference changed with a peakby a period on the water tank experiment scale. As a result, I was able to confirm that it was necessary
to consider the influence on phase difference of the depth of the water by the water tank experiment in
the specific period.
In this paper, we purpose a Method of Nearby Problems (MNP) for Finite Element analysis of the
Stokes flow. MNP developed by Roy el al.is one of sophisticatedShugo OHTA

Kazumi
MATSUIA Method of Nearrby Problems

verification techniques. In thisapproach, the setting and exact solution can be obtained by a curve fitting of the numerical solution for

for Finite Element Analysis of the the target problem. We proposed an alternative procedure for the method of nearby problems by using
Stokes Flow.

inner product projection of the numerical solution to a continuous function for the nearby solution in
the function space. In this work, we apply our approach to the problem of Stokes flow, in which
incompressible constraint is imposed to the velocity field.
In general, mechanical property of material in numerical simulations are determined from results ofseveral material testing such as tension, compression, and shear testing. However, the stress state of

KazuyaKazumiOKADA

MATSUI

Choice of Loading Conditions inmaterial testing is different from that of the structure which is simulated in numerical simulations.

Material Testing for Hyperelastic

Mechanical property should be identified by the material testing which have the similar stress state to

Body Based on Stress Analysis

the structure.
This paper proposes the method to select the appropriate loading conditions in material testing by
evaluating the stress state of the structure using stress analysis.

In this research, stick and slip behaviors on grain boundaries are simulated by using the multi-scale
ShinichiTakahiro

OCHIAIYAMADA

Macroscopic characterization ofpolycrystals with grain boundary
slidingmodeling method, to express the Inverse-Hall-Patch relationships. The general strength ofpolycrystallines depends on their representative size of grains, not only the increasing (H.P. relation),but also the decreasing of the strength have been widely accepted in nowadays. To simulate the inverse
relationships without any size parameters, mechanics on grain boundaries are focused and modeled in
the context of multi-scale simulation method.
Gears of automatic transmissions are shifted with friction force of a multiplate wet clutch. In the wet
friction clutch, undesirable vibration and noise can occur when gears are shifted. In this study, anTaroHanakoA Study of Friction Vibration and

KANKYOJOUHOU

Noise of Wet Clutches

experimental setup to focus on clutch plates and a transmitting shaft in a wet clutch system wasdesigned and the generation mechanism of the friction vibration and noise was investigated. The
Separator plate acceleration waveform like damped free vibration of around 170 Hz and the sudden
increase of sound pressure of around 950 Hz were observed just after the contact state between theseparator and friction plates transiting from the stick to the slip state.
Space debris became one of the difficulties for mankind to utilize the space environment. Among the

The Relative Speed Control ofShunsuke
KURODA

Seiya UENO

Super Multi-link Space
Manipulator to Capture Space
Debrisvariable efforts to the debris problem, the development of technology for the active debris removal(ADR) is especially imperative. This paper is on the motion simulation of debris capture manipulator
for ADR with large number of links. In this paper, the control law to lower the relative velocity after
the impact is brought in, and the results has shown almost over 80% of reduction regardless of theinitial velocity of moving target debris. This will enable the system to capture the target debris moresafely.
Wave power generation system is now expected as the way of utilizing marine energy efficiently.

A Study on Electric Power for
Shu

Motohiko

Multiple Linear Wave Energy

KUWADA

Murai

Converter Considering theInteraction EffectConsidering the sea condition in Japan, it is advisable that we set many floating type wave energy
converters in array. But now, the study of the wave energy converter is progressing mainly for single
body and is not so much for plural bodies considering interaction effect. In this study, I assumed Linear
wave energy converters as calculate model and researched the electric power for ones considering theinteraction effect and the controlling force from linear motor. From the analysis, I could find somecharacteristics of wave energy converters that be set in array.

This study discusses on a new control approach using dynamic property working on multirotors under
Katsuya

Takehiro

SAIKI

HIGUCHI

Study on Cooperative Control ofMultirotors under Dynamic
Constraints by Tether

tether constraint. As goods transportation method, idea of coordination transport using tether has been
proposed. In this study, this idea is newly applied in the field of multirotor. In cooperative flight,
aircrafts require the input to cancel each other's tension. This study derives the force to consider forstable flight from the dynamic relation working on multirotors and verifies through experiment andsimulation.
This thesis will give algorithm of automatical line heating, in which heat conditions are

The Development ofdefined throughout the arbitrary heating path. NURBS-based isogeometric analysis, isKazukiTakahiro

Isogeometric Analysis using T-

used to improve the accuracy of curved surface. The main focus will be on use of T-

SAKAMOTOYAMADA

splines among Required Line

splines, based on B-splines, which makes it significantly easier to treat multiple patches.

Heating

This isogeometric analysis will prove to be better than for a traditional FEM for the
analysed problems, by reducing the time and effort of building models.
This paper is on the trajectory generation of Reusable Launch Vehicle (RLV). In RLV's reentry,

Kazuho SATO

Seiya UENO

Study on Guidance Law forthruster cannot be used. Therefore, management of mechanical energy is important. To makeWinged Reusable Launch Vehicle

autonomous return more reliable, this paper proposes guidance law with management of terminal

with Management of Terminal

energy. In this guidance law, trajectory is updated intermittently with changing terminal altitude. At

Energythis time, terminal altitude is determined by feeding back the energy. Finally, the results show thatpracticality of proposed guidance law is verified from the point of view of energy management.

Katsunobu

Ken

SUZUKINAKANO

Objective evaluation of operation
feeling of rotary switches byhybrid velocity/torque control

With a view to understanding human touching behavior, focusing on the operation feeling of rotaryswitches, an experimental apparatus has been developed, which implements hybrid velocity/torquecontrol system. Tactile information was obtained by analyzing not only output signals but also input
signals.
Method of Nearby Problems(MNP) which is one of verification procedure have been devised. This

Verification Procedure Baced on

method generates the problem with exact solutions near the target problem of interest. In this paper,

Ryo

Kazumithe Method of Finite Element

nearby solution is constructed by the projection of displacement field in the deformed shape to a B-

TAKAHASHI

MATSUI

Analysis of Hyperelastic Large

Spline function, then deformation gradient and first Piola-Kirchhoff stress is calculated to obtain

Deformation Problems

external force. External force term of Nearby Problem is close to internal force of the target problem inthe compressible material in the large deformation state.

Researches and developments with a Flying Test Bed (FTB) for planetary landing have been advanced
Toshiki

Takehiro

TAMURAHIGUCHI

Study on Guidance and Control
Law of a Flying Test Bed (FTB)
for Planetary Landing

to develop landing technologies needed for planetary investigations such as Moon and Mars in the
future. In this study, the guidance and control law for the autonomous flight which can satisfy
constraints of sensors and thruster performance has been designed and numerically simulated for the
FTB flight test planned to be implemented in the second half of fiscal 2016. It can be designed
guidance and control law for the FTB which has high robustness.
This study focuses on guidance control for demonstration of lunar landing technology 'SLIM Project'.

WataruNAKAYASU

Study on Terminal Guidance
Seiya UENO Control Laws Based on PNG for
Lunar Lander

In power descending, feedback control law is required, which guide the lander to target precisely
canceling guidance error. In this study, control laws are mainly based on Proportional Navigation
Guidance (PNG). Numerical simulations show the utility as method used in terminal guidance,
confirm the correspondence to the errors, and inspect the current system requirements.
The mechanical behaviors on grain boundarys are directly modeled into the conventional modeling ofcontinuum mechanics to explain well-known Hall-Petch relations. A commonly used metal material is

MasayaKazumiHIRANO

MATSUIA study on correlation between
macroscopic strength and grainboundary stiffness in polycrystals

an aggregate of crystal grains having different crystal orientations and is called a polycrystalline
material. In this polycrystalline, the material properties change due to the influence of the microscopic
structure. Attention was focused that grain boundary stiffness is different from grain stiffness andmodeling grain boundary element for finite element method. Consider the influence of microscopic
grain boundary mechanical behavior on the macroscopic strength of polycrystalline on continuum
mechanics.
This paper describes the noise control for a moving evaluation point using neural networks by making
the best use of its learning ability. To obtain good control performance, it is important to precisely

ToshikiToshihiko

A Study of Noise Control by

MAEDA

SHIRAISHI

Neural Networks with Dropout

identify the characteristics of all sound paths at all time. In this paper, we applied neural networks withthe learning ability to the noise control system to follow the time-varying paths and verified its control
performance by numerical simulations. Then, dropout technique for the networks was also applied.
Dropout is a technique that prevents the network from overfitting and that realizes better control
performance.

The high-speed photography of strain distribution in gear teeth during rotation and the gear noise were
simultaneously captured by high speed camera and microphone. Gears are usually used in transmission
Daisuke
YAMAZAKI

Shin

Study of the gear noise

systems, and they encounter serious problems on noise. In order to solve these problem, it is important

MORISHITcharacteristic by using

to know the elastic deformation in gear teeth during operation. In this experiment, the photo-elasticity

A

photoelasticity technique

technique was applied for visualization of strain distribution. As a result, the sound pressure became
local maximum at start and end meshing, and became local minimum before pitch point. Also thefrequency analysis was affected by these points.
This study attempts to propose the new Multirotor to fly in the environment with wind disturbance.

Takahiro

Takehiro

YAMAMOTOHIGUCHI

Study on Development ofMultirotor with Wind Resisting
Performance

The wind resisting performance is relied on the hardware composed of ‘Weathercock device’ and ‘Side
thruster’, which are proposed and designed newly. To use these devices properly, the software is also
designed. As preparation, the motion of multirotor is calculated by simulation. This results show good
response thus the verification experiment is carried out. Both results show good response, and it isfigured out that these results are similar.
This study discusses on development of multirotor that is able to generate electricity with wave power.
Some multirotors are used various places and purpose, but it is necessary to change the battery because

Tsubasa

Takehiro

Study on Development of New

YOKOYAMAHIGUCHIMultirotor for Offshore Operation

it is limited flight time. The new multirotor is proposed and developed. In this study, it is equippedwith measuring device that measures wave power so it is not the case that a new generator isdeveloped. It is experimented measuring wave power and calculate energy with a water tank in myuniversity. Also, the simulation display control of detached water is considered viscous frictional
forth, when multirotor detached water on this side becoming maximum tilt angle.
Many wave tank experiments have been conducted in research on oscillating water

Experimental study on interaction
Hisaki

Motohiko

YOSHIOKA

MURAI

among air amount,nozzle opening
ratio and water surface elevationin semi-submersible column withnozzlecolumn (OWC) type wave power generator. In a wave tank experiment, attention is paid
to nozzle opening ratio and water column draft as parameters related to primaryconversion performance. However, in the wave tank experiments, since the physicalproperty values of air in the OWC are different, there is a possibility that theperformance of the actual machine can not be evaluated correctly. Therefore, in thisstudy, we examined whether the internal air volume can be a new parameter in modelexperiments, based on experiments and numerical calculations.

A Study on Viscous Drift Force
Ryo

Motohikoon

Fukushima

Murai

Splash Zone of
Semisubmergibles

In designing the mooring system of semisubmersibles, which develop offshore gas fields, viscous drift
force on splash zone of colums of them is important because it is noticeable under higher and longer
wave condition. In this paper, we provide methods to calculate viscous drift force and compare surge
motion of calculation and that of model experiment in wave tank to select the best method. We
estimate an increment of drift force by using the new method and redesign mooring lines to survive.
Control moment gyro (CMG) is device used as an actuator for attitude control of spacecraft andprovides high agility. This paper discusses on the minimum time maneuver from viewpoint of optimal

Yoshifumi

Takehiro

NAKA

HIGUCHI

Study on Singular Inputs forcontrol with CMGs. According to optimal control theory, bang-bang control is optimal in most of the

Minimum Time Maneuver of a

inputs for minimum time maneuver. However, some data did not such a result where an input. These

Satellite with CMGs

intermediate inputs are called the singular inputs. In this paper, we suggest a new model with a CMG
with controllable angular momentum in the CMG with the singular input. The new model has shownfaster maneuver more than 15 % in some of the cases.