学科の特徴
新着情報
カリキュラム
講座・教員一覧
受験生へ
就職状況一覧
よくある質問
連絡先
大学院について
トップに戻る
English Page
Last Up Date '02.01.07
Lab. of Strength of Materials
The increasing demand for more reliable and/or lighter structures owing to the advances of modern technology necessitates more sophisticated experimental and analytical schemes as well as new materials with higher performance. Our major research field is structural mechanics which concerns stress analysis, vibration and buckling of structures. Currently our researches are mostly relating to advanced composite materials and optimization techniques. Recent research themes are:
1. Mathematical programming methods for the optimal design of structures.
2. Automatic meshing of Finite Element Method.
3. Nonlinear response of structures to random and impact loading.
4. Buckling and post-buckling of structural elements.
5. Impact response and damage accumulation in composite plates.
6. Compressive strength reduction after impact loading in composite plates.
7. Damping property of composite panels with thin damping polymer sheet(s) between the laminae.
8. Philosophy of technology.
Lab. of Dynamics of Machinery
When we are concerned with dynamic systems, the analysis and the synthesis of them are very important. Nowadays, they are getting more and more important, since the dynamic systems concerned are getting more and more complicated. Main purposes of our laboratory are the analysis and the synthesis of the dynamic systems and making use of the results to the design of the dynamic systems . Our current topics are:
1. Evaluation of the dynamic characteristics of vibration absorbing rubbers and optimal design of vibration reduction apparatus.
2. Aseismic design of structures and equipment (mainly of liquid storage tanks, and equipment inside a building) .
3. Evaluation of time integration methods.
Lab. of Heat Engineering
Heat engineering has a history of three hundred years and is currently one of the most active field. It is an urgent problem at present to reduce energy consumption and pollutent emission, and to keep our planet clean. The concept of heat engineering is very important to solve this problem. Our group makes an intensive study in four branches of research on Gasoline Engine. (1) New thermodynamical analysis on gasoline engine. (2) Heat transfer and heat loss in engine. (3) Measurement of air quantity and A/F ratio of every cycle and every cylinder, and its application to engine control. (4) Microscopic and instantaneous structure of turbulent flame. Current objectives of our laboratory;
* Cycle analysis taking account of heat transfer and heat release rate .
* Optical measurement of temperature gradient at surface in a combustion bomb.
* Measurement of heat loss of engine using an indicator diagram only.
* Measurement of air capacity of engine using an indicator diagram of a gas exchange process .
* Two color measurement of mixture strength of the burning mixture in engine .
*. Measurement of curvature and thickness of turbulent flame front using an ion current detector.
*. Application of Complex supercharger to gasoline engine.
Lab. of Fluids Engineering
1. Analysis of flows using a streamline-coordinate system
The Streamline-coordinate theory is further developed. As an example, some boundary layer problems are calculated using a new theory.

2. Analysis of the flow through a spool valve
The turbulent flow through a spool valve is analyzed numerically using a finite-difference method named HS-MAC, taking the three-dimensional effect into consideration. Three-dimensional flow visualization is carried out, and image processing is performed using the visualized results. The pressure distribution on the spool is measured using the same test valve as flow visualization. The calculated results are compared with the experimental results.

3. Stabilization of a load sensing system
Hydraulic load sensing systems have inherently unstable characteristics. A model reference adaptive control (MRAO theory is applied to stabilize a load sensing system which was set up for experiment. A controller was designed by the use of an MRAC theory. Experiments are being carried out to investigate whether the system can be stabilized or not.

4. Dynamic characteristics of the hydraulic system consisting of a vane pump and a pipeline.
This study deals with the dynamic characteristics of the hydraulic system which consists of a vane pump and a pipeline including a resonator hose which is practically used for eliminating noise. The pressure-flow characteristics are experimentally investigated. The dynamic characteristics are also studied by simulation.


1. Application of the adaptive control theory to an injection molding machine
A model reference adaptive control theory is applied to an injection molding machine to control the time history of both the velocity of the actuator in the injection process and the force produced by the actuator in the protection process independent of the changes in oil temperature, load and so forth.

2. Study on a constant pressure system
The drive system fed by a constant pressure net is an energy saving new drive technology. Application of this technology to linear movement will be examined by numerical simulations and the possibility of the model reference adaptive control theory to the system will be discussed.

3. Study on high speed operation of a rotodynamic pump
This study deals with the cavitation performance of a centrifugal pump in high speed operation. To avoid the cavitation a spiral-suction casing has been developed in Japan. In order to confirm the effect, experiments are carried out and the results are compared with those using conventional end-suction casing. Also the velocity distributions just upstream of the impeller inlet for both suction casings are measured with five-hole Pitot tube.

4. Thermodynamic analysis of a pneumatic system
In pneumatic system air temperature changes according to pressure changes. The temperature changes sometimes bring about operational difficulties .The temperature changes in a pneumatic cylinder are analyzed by numerical simulation including the effect of the convection caused by heat transfer between the surroundings and the air.

Lab. of Precision Engineering
Precision Engineering is concerned with the wide field for producing the machines and their elements with high quality and performance, and its research fields spread from design, machining, instrumentation to manufacturing system. Our current research themes:

1. Machine Tool Performance Test

i. Application of impulsive response test to nonlinear structure : Control of exciting force, Influence evaluation of dynamic characteristics of testing structure, Presumption of nonlinearity in the testing structure, Parameter identification of nonlinear characteristics of testing structure , Expert system for presuming nonlinearity of testing structure
ii. Simultaneous measuring method of 6 geometric errors in machine table motion
iii. High accurate measuring method of angular position of rotary table
iv. Performance test of ultra high speed spindle
v. Development of visual diagnosis system of rotating errors in machine tool spindle
vi. Dynamic characteristics of rotating spindle system

2. Development of Machine Tool Elements and Education Method

i. Inprocess monitoring method of working surface of grinding wheel
ii. Qualitative measuring method of joint interface pressure distribution with ultrasonic wave
iii. Qualitative measurement of interface pressure of multi-bolted joint
iv. Experimental identification of contact stiffness of joint interface
v. Damping characteristics of bolted joints
vi. Development of new joint interface between tool and spindle for high speed
vii. Thermal behaviors of machine tool structures
viii. Development of design procedure for machine tool spindle with high dynamic stiffness
ix. Education method of the machine design with 3D-CAD system
Lab. of Control Engineering
Control engineering is one of the most active and challenging field . The concept and tools in automatic control come into play in all fields of engineering. Our group is active in three aspects of research.

a) Fundamental Research: dynamical system theory and various mathematical tools for automatic control including linear and nonlinear system theory, stability theory, stochastic system theory, linear algebra, differential equation.

b) Theoretical Research: studies and development of advanced control theory including Hoo-control, adaptive control, multivariable control, nonlinear control, stochastic control.

c) Applied Research: experimental studies of application cases using prototypes of concrete problems, which aim to verify the adequency of theoretical results.

Current Activities:

* Design of model reference adaptive control system
* Synthesis of adaptive observer
* Solution of multi-level optimal control problems
* Numerical approach to large scale optimal control problems
* Linear vector maximization problems
* Optimality condition for non-dominated solution
* H infinite control system
* Exact model matching control of multivariable systems
* Stability of stochastic control systems
* Adaptive control of manipulator
Lab. of Materials Science and Engineering
A solid body responds to deformation and fracture by loading. The fracture of structure components occurs without warning. So evaluation of fracture mechanisms will significantly contribute to structure design. Our major concern is microscopic fracture mechanisms of advanced materials such as Ti alloys, Ti-Al intermetallics, ceramics matrix composites and biomaterials. Current technical papers:
1. Hydrogen-induced cracking in titanium alloys.
2. Evaluation of tearing modulus in Ti-6Al-4V alloy by fractal analysis of fracture surface.
3. In-situ observation of stable crack growth of Ti-6Al-4V alloy.
4. Fracture behavior of boride-dispersed composites fabricated by hot-pressing amorphous Ni60Mo30B10 powder.
Lab. of Systems Engineering
"Systems" and "Computers" are key words in modern society especially in engineering. Major research efforts of our group are directed to developing basic methods of systems analysis and their applications to various systems in manufacturing, communication, and transportation. Current research topics include:

a) Mathematical Programming Studies:

* Two-level and nondifferentiable optimization
* Interior-point methods
* Semidefinite programming
* combinatorial optimization: theory, algorithms and applications

b) Stochastic Systems Analysis:

* Studies of queueing network with finite buffer and their applications to production lines and communications
* Modeling and analysis of automatic guided vehicles

c) Computer Applications:

* Recognition and reconstruction of 3-D objects from 2-D image
Lab. of Information Systems Engineering
1 Methodology and tool for software engineering
2 Automatic processing methodology for engineering draft
3 Expert system for practical system development
4 Evaluation system for system improvement
5 Domain analysis and modeling
(C)2002 Sophia University All rights reserved.