This paper deals with invention of a new measurement principle for straightness profile measuring instrument based on numerical software datum. The novel sequential two-point method was realized using a twin heads displacement sensor and a shifting reference plate in the lateral direction. Utilizing a precise level meter for correction of the reference plate slope, a long distance straightness profile can be measured in an extrapolative way. Uncertainty analysis on designed specifications of the measuring instrument assured its high accuracy and practicality. The experimental variation of straightness profiles measured by a developed measurement system was in a good agreement with the numerical simulation.
In the field of centrifugal blood pumps, contactless support of the impeller by a magnetic bearing has been identified as a promising method for reducing blood damage and to enhance durability. We developed a novel blood pump both with a two-degree-of-freedom radial controlled magnetic bearing and a contactless torque transmission mechanism placed in the outer side of a permanent magnet-free impeller. The proposed mechanism can realize not only a smooth secondary flow in the pump, but also a cost effective pump head. The prototype magnetic bearing and magnetic coupling succeeded in the stable levitation and contactless rotation of the impeller both in air and water. The pump can provide a flow rate of 5L/min against a head pressure of more than 350 mmHg. In order to simulate the ventricular assist condition, the prototype pump was connected to a mock systemic circulatory loop including a pulsatile pump. The dynamic stability of the impeller was experimentally verified when the pulsatile pressure was applied during the left ventricular assist.
Recently, the needs of a profile measurement of customers in all market areas for the purpose of providing products and services that meet customer needs are increasing. This paper describes the development of a profile monitoring system of visitors using a video camera from the integration of human detection from upper body image and profile estimation from face image for the purpose of measurement. The upper body detection increase robustness of human detection with respect to the direction and overlap of a person. Moreover, a stable monitoring is realized by the synthetic estimation of visitors profile in multiple frames to track the person. In commercial facilities, the privacy of visitors will be required from the processing is performed in real-time recognition and non-saving video on the spot shooting. The implementation to commercial facilities which is achieved by performing the real-time processing with reduced cost recognition using appearance-based feature vectors is shown.
This paper investigates the dynamic characteristics of an isolator supported by four air suspensions. Each air suspension has a cylinder, a reservoir tank and a slit restriction. The air suspension with the slit restriction provides damping which is introduced through the flow restriction connecting the cylinder and the reservoir tank. The slit restriction is effective for suppressing micro vibration because air flow in the restriction is viscous flow. The effects of the air suspension with the slit restriction are shown through theoretical analysis and experimental tests. An experimental investigation indicates the air suspension model including rubber membrane predicts frequency-domain behavior closely. Experimental tests show that the maximum transmissibility of the isolator is about 1.5 by choosing the optimal slit depth.
In this study, Robot Motion Performance Platform was developed. This system is the servo motor control platform based on the memory based technique. This system can execute motions on a robot having various legs and arms. The important feature of this system is the motion mixture function. The motion mixture function can synthesize new many motions from few basic motions. In this system, a sensor feedback processing can change the current executing motion. For example, a sensor feedback processing can exchange several current executing motions and can modify motion data at certain joints. Such sensor feedback processing can execute some subroutines which the user added. The motion that was generated by the synthesizing motion can be a motion to switch motions. Therefore, a sensor feedbacked motion corresponding to the environment can be synthesized from few basic motions by this system.
A tungsten (W) layer whose thickness was tens of micrometers or more was formed by electrical discharge coating using a W electrode which was made from the semi-sintered powder of pure W. The thickness of the W layer was 0.28 times the electrode wear length which was set up as the coating conditions. The density of the W layer was about 12.3×103kg/m3. Many solidified materials whose size was about 10 to 20 micrometers and many voids were observed in the W layer. The Vickers hardness test using the load of 9.8N showed that the hardness of the W layer was 281HV1. The diagonal length of the indentation of the test was several times as large as the solidified material in the W layer. The hardness of the W layer was lower than that of pure W metal. After electron beam irradiating, the densification of the W layer was observed. The thickness of the W layer was contracted from 0.58mm to 0.37mm and the hardness of the layer was improved to 1788HV1.
Diamond has superior characteristics such as the highest thermal conductivity and dielectric breakdown field, and is expected to be a good candidate material for the next generation semiconductor device. On the other hand, the etching and the mechanical processing are much difficult because of chemical and physical stabilities of diamond. As the device materials must be polished without the crystallographic distortion beneath a polished substrate, the simplified planarization techniques accompanied with high surface quality is intensely required. The ultraviolet rays excited polishing of single crystal diamond substrates has been studied in our laboratory. The UV-polishing characteristics, such as higher polishing rate and superior final surface roughness, have been revealed in these many years. This work will interpret the UV-polishing mechanism to achieve a well-polished diamond substrate satisfied for the requirement of the semiconductor device materials. The effects of the ultraviolet irradiation and processing atmosphere on the polishing rate and surface integrities were carefully examined. The polishing mechanism was discussed using experimental results of the luminous phenomenon, CO gas concentration and TEM observation of abrasion powder. The polishing model based on these discussions was proposed, and high-grade diamond wafer was finally obtained by the UV-polishing under the polishing conditions decided by the proposed polishing model.
This paper proposes a novel method on 3D fitting simulation of eyeglass frames to individual faces. First, we formulate the fitting operation of the eyeglass frames to the individual faces at real optical shops. We utilize the analogy of the structure between eyeglass frames and robot arms. Under the analogy, the bending angles on eyeglass frames correspond to the rotating angles on robot arms. Then, we extract the simultaneous structural conditional equations which are derived from the matrix equation on a closed loop along the base to the end-effector through the arms using inverse kinematics. We can obtain the optimum bending angles by solving the equations using the Newton-Raphson method. Finally, we will show some examples applied for several frame types and individuals. As a result, it is confirmed that the proposed method is very effective.