List of Dissertation Abstract (Environment and System Sciences)
NameSupervisor

Title

Abstract
Automatic control of the automotive SI engine has been an active research area to reducehydrocarbon emissions during the cold start period. The model order reduction is a key

Toshihiko
Satoshi ASAMISHIRAISHI

A Study of a Reduced-order Controller technology to embed a model-based controller on a electrical control unit.. Although few
Using Nonlinear Balanced Truncation to nonlinear engine models have been reduced to design the model-based controller for the coldReduce Cold Start Emissions of Spark- start problem. In this study, a representative nonlinear cold start engine model was reduced
ignition Engines

by a proposed balanced truncation approach. Based on the reduced nonlinear model, a sliding
mode controller was designed. The availability of the controller was verified by numericalsimulations.
This paper describes systematic handling and its uncertainty evaluation of various
measurement technologies taking the case of marine turbochargers evaluation test. To

Toshiyasu

Shin

KOIKE

MORISHITA

Measurement Technology and Its
Uncertainty in Evaluation Test ofMarine Turbocharger

perform these tests, automation of the data measurement and the control system should beimproved. By means of these improvements, it becomes possible to extract necessary datafrom a lot of measurement data. The macro function of the spreadsheet software enables us
to process and calculate data necessary for evaluation and to display them graphically during
the test. Statistical processing of such a big amount of data also enables instantaneous checkof “uncertainty” of measurement during the test, an index of measurement accuracy.
In this study, the simulation method, which enables to simulate the situations from initialstate with small strain to their failures with large plastic and discontinuous deformation. Toachieve these kinds of simulations, some special treatments are required, that is, not only theHirofumi

Takahiro

SUGIYAMAYAMADA

Development of finite cover method for volumetric locking-free approximation for large plastic deformation but also the expression
capability for the discontinuities. This study employed the Finite Cover Method to describe
ductile fracture
the strong discontinuities, and P1-iso-P2/P0 element for avoiding the volumetric locking.
Then some numerical examples show the capabilities the method in typical ductile failure ofmetal materials.

In the finite element analysis, computational costs and accuracy of calculation arecontradictive properties. For the purpose of overcoming such properties, this paper proposesa technique for evaluating the behavior in the thickness direction using shell elements. TheTakeki

Takahiro

YAMAMOTOYAMADA

Numerical analysis using shell element
to represent thickness–stretch for thickwalled structure

behavior of the proposed shell element to represent thickness–stretch is similar to that of thesolid element, and hence both elements can be connected with satisfying the continuity ofthe behavior of each element by developing a numerical procedure based on Nitsche’smethod. In this approach, the continuity condition for displacements and stress vectors canbe imposed on the connecting surface. Several numerical examples are presented to examine
the fundamental performance of those techniques.