Yoshio Ishikawa

Building of Window based on Object-Model.

With the increasing application of large-scale and complicated systems in practical use, there is a need to develop systems on engineering work stations (EWS), in consideration of memory and speed of processing. However, it is very difficult to develop an application program with a graphical user interface (GUI) on an EWS. The authors have built a model of GUI based on the concept of object-model, and developed a function to create a source code of GUI by using this model. In this paper, knowledge representation of the model, the method for creating a source code of GUI by means of the model, and the method for controlling communication between the application and GUI are described.

Structures Which Support the Parabolic Structural Surface.

Structures which can be modified to make fine adjustments to arbitrary structural surfaces have been investigated in the construction of space structures. Considering the geometrical configuration of these structures, the. same concept might be applied to structures such as those which are used in collecting sunlight. In this paper, we describe a designing method by which to build to build structures that can be extended and adapted to a parabolic structural surface.

Managing System of Knowledge Base in Machining.

It is possible to incorporate a system which manages a knowledge base into an expert system. Because, by using this system, we can rebuild knowledge bases which have no logical contradictions with knowledge of experts and phenomena which we experience daily. However, it is difficult to build beyond systems in the machining field due to the existence of many kinds of knowledge, if we want to achieve rebuilding of the knowledge bases using current representation language. Thus, we developed a truth maintenance system for knowledge bases by using a new predicate-logic representation language. This paper describes how to manage knowledge bases and how to treat the functions in a truth maintenance system using this system when contradictions occur in the practical machining problem.

Measurement of the thermal distribution of a machine device using a charge-coupled device camera.

For the purpose of estimating the thermal condition of machine devices, we investigate a new method of measuring temperature using an encapsulated liquid crystal (ECL) film and a charge-coupled device (CCD) camera. When an ECL film is placed in direct contact with subjects, it exhibits some colors accompanying temperature change. But even if these colors are obtained, it is difficult to judge values for temperature or extension of isothermal line with the naked eye because of optical noise. In solving the above problems, we investigate a new photogaraphical recording method of intensifying colors using a CCD camera and graphical processing with a personal computer. The availability of this method is confirmed by analyzing heat conduction in the plate.

Hybrid type transfer mechanism. (2nd Report).

We described in the previous report a new transfer mechanism which has two motors; one is the main motor for conveying materials and the other is an auxiliary motor for controlling tensile force and chain slack. But, when we use generally conveying system it can be foreseen that vibration often occures by the outer load and the performances decrease. So to decrease the vibration, we investigate the controlling method to hold constant the tensile force of chain and improve the efficiency. In this report, we use modern control theory for the hybrid type transfer mechanism and discuss the performance of controlling system.

Hybrid type transfer mechanism.

are driven by a motor, and the driven sprocket is controlled by a brake to give a moderate tensile force. However, it is difficult to adequately control the tensile force, because the brake has a tendency to influence the torque and revolution of the driving motor. We then developed a new driving system which has two motors ; one is the main motor for conveying materials and the other is an auxiliary motor which is used to control tensile force and chain slack without influencing torque and revolution of the main motor. In this report, we describe the performance of this system.

Lubrication properties of nylon mixed with lubricants.

Plastics are used widely as sliding parts. In order to investigate the effect of the varied lubricants mixed in the nylon rollers, experimental equipment was designed and manufactured. In the experiment on the friction of the nylon roller, a nylon roller was rotated contacting with a steel roller in the same direction. From the results of the experiments, it was clarified that the lubrication properties, the friction characteristic and the wear resistance differ with each lubricant mixed in the roller, and the limit for use as the sliding parts could be obtained.

Analysis of dynamic behaviour for power transmission mechanism using linear graph theory

The importance of system design in the field of mechanical engineering has been increasingly recognized, but suitable and useful methods for machine design are not yet established. The authors derive easy and useful designing methods for each machine element. They derived a new designing method by linear graph theory and analyzed the results of the dynamic behavior of a power transmission mechanism as an example. The mechanisms which are subject to restrictions of high accuracy and high performance must be designed by considering the characteristic of each machine element. This report deals with a more general power transmission mechanism containing a motor, bearing, and support, and analyzes the results of dynamic behavior. Provided that the analytical model and system graph as in this report are prepared for the mechanism, the performance of the mechanism is easily grasped by this method.

Stress distribution and deformation of some cams.

各種自動機械に用いられている位置決め装置の構成要素であるカムなどは,機械の高精度高性能化に伴って,多種多様な形状のものが使用されるようになってきている.しかしこのような機械要素の応力分布および変形に関する研究はほとんどなされていない.そこで,本報では,複素応力関数を利用して理論解析を行い,種々の形状のカムについて応力分布および変形を求めた.