The output of the wind power is dependent on natural phenomena, the influence on the power system connection is of particular concern. Therefore, to predict the electricity generated by the wind power, efficient utilization of the wind energy can be expected. In this study, the wind speed prediction method of wind power with support vector regression SVR, k-NN and VAR model using the time-series wind speed data of multiple neighboring sites is proposed. The wind speed prediction performance with wind data of multiple sites including meteorological towers in Tohoku district is evaluated.
We have developed a 3D-shape measurement technique of a step-like rough surface using speckle interferograms captured under random phase shift. Amounts of the phase shifts between captured interferograms are calculated both through Max & Min light intensities searchings at two different pixels along frames and twin normalizations of their intensity changes. The calculated phase shifts are used to extract phase distribution of a speckle interferogram. After capturing 280 specklegrams which consist of 40 specklegrams at wavelengths of 778.19 nm, 778.20 nm, 778.24 nm 778.35 nm, 778.61 nm, 779.14 nm and 780.9 nm, phase distributions are extracted regarding the first captured interferogram in each wavelength. The ratios of phase change against wavelength change are then extracted at all the pixels, and 3D shape is calculated from the extracted ratios. This 3D-shape measurement technique is now applied to an iron head of electric-solder whose temperature is rising from room temperature, RT, to 392 degree C. At the first trial, the obtained shape data have involved intense error except RT. Then we introduce some new data processing, and then analyze origins of remaining errors. Finally, effective data processing are found which can measure the 3D shape of the head at from RT to 392 degree C.
This paper presents a new vibration cancelling system intended for a precision positioning stage system. Machine performance of ultra-precision positioning stages for semiconductor manufacturing systems is affected by nanometer-scale vibration caused by driving noise from an actuator with high thrust force. Such nanometer-scale vibration of the stage is difficult to control only by using the driving actuator of the stage. We thus developed an active vibration cancel system with a two-degrees-of-freedom (2DOF) elastic structure in a moving table of a stage, which has high responsiveness and high stiffness. The results of a performance evaluation revealed that the developed vibration cancel system could suppress the nanometer-scale vibration of the positioning stage.
In order to improve the quality of the appearance of plastic molded products, an injection molding process using a heating and cooling mold equipped with far-infrared radiation heater has been proposed in previous report. This molding process has some problems such as not being applicable for flat plate molding products. In this study, in order to apply this process to the molding of complicated three-dimensional products, a new mold which can be applied for molding shallow boxes was designed and manufactured, and the advantages of this mold were investigated. It was found that heat and cool molding using this mold minimizes undesirable phenomenon such as weld-lines, flow-marks, and silver streaks, and that molded products made by this method have excellent shiny faces on all sides. In addition, heat and cool molding using high impact polystyrene and glass fiber reinforced polycarbonate has been attempted. Compared to normal molding, molded products with smooth surfaces and minimized exposure of rubber particles and glass fibers to the molded product surface have been obtained.
Recently, demands have increased on fabricating complex and accurate structures by ultra-precision cutting. However, the machinability is influenced by crystallographic orientations in micron/submicron cutting. In our past work, it was clear that the crystal anisotropy affected the elastic recovery in submicron groove cutting of single crystal copper. Before the experiments, three-step cutting, i.e., rough cutting, intermediate cutting, and finish cutting, have been employed to flattening single crystal copper surface. The depth of affected layer was thinned by increasing the number of intermediate and finish cutting. Nevertheless, few microns of affected layer remained on finished surface. The rough cutting step is considered to cause the remaining affected layer. In this paper, we have investigated the effect of cutting conditions of the rough cutting step to reduce the depth of affected layer. The Schmidt factor of each slip system was calculated from measured cutting forces. Results suggest that the slip system and its Schmidt factor may explain the machinability, and results indicate that the thickness of affected layer decrease with an increase in cutting speed.
Patterns are one of the important factors for aesthetic design of products. Crack patterns made on surfaces of pottery and chinaware as decorative craft-patterns give users relief and peace. This paper proposes a digital design method of crack patterns which show required impressions. In the proposed method, crack patterns are generated by computer algorithm based on physical phenomenon according to required impressions of users or designers. The impressions for a crack pattern are represented by KANSEI words with weights. The parameters to generate crack patterns are derived from a neural network system by giving the KANSEI words with weights required to a crack pattern. A basic system to generate crack patterns is constructed according to the proposed method. The effectiveness of the proposed method is verified by experiments with questionnaires.