A Novel Method Applicable to Large-Scale Active Magnetic Shielding System which Effectively Compensates Gradient Magnetic Fields Originated from the Surrounding Buildings
論文No: ページ数: 9 日付: 2023/03/01
著者: 緒方 拓斗（(国研)宇宙航空研究開発機構），村田 直史（(国研)宇宙航空研究開発機構），清水 隆文（(国研)宇宙航空研究開発機構）
キーワード : アクティブ磁気シールド，勾配磁場，磁場補正，磁場均一度
active magnetic shielding，gradient magnetic field，magnetic field compensation，magnetic field uniformity
We propose the novel magnetic compensation method which is suitable to compensate gradient magnetic fields. The method is to be applied to a conventional large-scale, tri-axial active magnetic shielding system such as sp ... more
Effect of secondary electron emission coefficient on accumulated charge density distributions in atmospheric pressure dielectric barrier discharges have been simulated using two dimensional fluid model. Spatio-temporal d ... more
Some safety-related low-voltage cables used in nuclear power plants are required to maintain the insulation performance even during severe accidents. It is not clear whether oxygen affects the insulation performance of t ... more
Cr-doped vanadium dioxide, V1-xCrxO2 (x = 0-0.20), thin films were fabricated by metal-organic decomposition. From X-ray diffraction patterns of the films at room temperature, VO2(M2)(201) and VO2(M2)(201) diffraction pe ... more
This paper deals with partial discharge inception voltage (PDIV) and long-term voltage-time (V-t) characteristics of Polyvinyl Formal (PVF) wires in mineral oil under thermal and electrical aging. The reliability of the ... more
To further validate the IEC specified waveform as an ideal contact discharge current presented in 2008 IEC 61000-4-2, a comparison is made with air discharge waveforms from an ESD generator measured under different tempe ... more
Lightning protection for transmission and distribution lines and substations is a quite important issue from the viewpoint of improving the reliability of power systems. The social effect by a strong lightning which rare ... more
Smart meters are installed in consumers connected to the power distribution system, and their power consumptions are measured. The authors aim to estimate the state of the distribution system from the measured values of ... more
The High-frequency Phenomenon of Copper Clad Aluminum Wires which are Lower the Alternating Current Resistance than Copper Solid Wires, and the Application of Copper Clad Aluminum Wires to the Electrical Equipment
論文No: ページ数: 13 日付: 2023/03/01
著者: 上田 克彦（UEDA Lb），洪 啓峰（大亜電線電纜）
キーワード : 銅クラッドアルミ線，うず電流損
copper clad aluminum wires，eddy current loss
The paper is proposed approximate formulas of the ac resistance of lead wires and coils which made by using copper clad aluminum (CCA) wires. There are the frequency range that the ac resistance of CCA wires is lower tha ... more
To improve the lightning-outage-rate calculation method of medium-voltage distribution lines, it is important to accurately assess sparkover rates of insulators. In salt polluted areas, lightning outage rates may increas ... more
IoT creates Big Data and tends to create heavy load in communication and in data analysis when being stored directly to the cloud computing system. Therefore, the edge computing becomes important and effective for the Io ... more
In this paper presents the activities of the research committee to date. The study of motorcycle riding skills is presented as an example of an effort related to the measurement, evaluation, and utilization of skills dat ... more
In painting processes, to prevent the occurrence of painting defects, the rotational speed of the bell cup should be adjusted online based on the painting quality. However, there is a considerable time-delay between the ... more
Every ecosystem is composed of multiple species. Hence, extinction of a specie might affects lives of other species, and of course, human life is influenced by populations of various species. Unfortunetaely, in general, ... more
In this paper, general-purpose feedforward control design for heating process systems is described. The feedforward control function should be implemented to a local PID temperature controller. The controller is supplied ... more
The purpose of this study is to devise and evaluate a coaching method by using kinematic feature values before and after coaching for beginners as a new quantitative coaching method in batting motion. After the coaching ... more
This paper proposed a thrust vector norm minimization control method for a twin-rotor drone model. The model represents a simple input-redundant drone that can operate two rotors for 1-DoF (DoF: Degree of Freedom) of mot ... more
This paper gives a method for converting finite-length transient response signals with non-zero steady-state values into the frequency domain. In the method, the signal is discrete Fourier transformed after adding a line ... more
In the construction industry, it is desirable to develop a system to easily judge skills of workers in order to effectively pass on the skills of skilled workers to unskilled workers. This report proposes a skill analysi ... more
In this paper, we propose data-driven control for the case of that the structure of the ideal controller is unknown. In this case, it is natural to implement FIR typed controller. Here, we utilize FRIT for the case of FI ... more
The database-driven (DD) PID control is a method of using a database to adjust PID parameters. System input/output data are stored in the database. The DD-PID control can be expected to expand the technology to smart sys ... more
As a nonlinear control approach, a database-driven PID (DD-PID) controller has been proposed that uses distance calculations of an initial database to tune PID parameters. However, sorting operations are required in extr ... more
A Study of the Education of Model Based Development Thinking in Junior High School Technology Education
論文No: ページ数: 8 日付: 2023/03/01
著者: 諏澤 侑汰（広島大学大学院人間社会科学研究科），村井 啓太（広島大学大学院人間社会科学研究科），川田 和男（広島大学大学院人間社会科学研究科）
キーワード : モデルベース開発的思考，SDGs，中学校，技術教育，計測・制御，比例制御
model based development thinking，SDGs，junior high school，technology education，measurement and control，proportional control
In order to make the realization of Society 5.0, which contributes to the achievement of the SDGs, a focus has been placed on human resource development to create new value in the Sixth Science, Technology and Innovation ... more
This paper considers the VRFT (Virtual Reference Feedback Tuning), which is a data-driven controller parameter tuning method using one-shot input-output data, and aims to improve control performance in the case of using ... more
This paper considers data-driven type generalized minimum variance control (GMVC) for p-inputs/q-outputs (p > q) multivariable systems with static nonlinearity. In the proposed approach, an autoencoder, which can extract ... more
The use of 3D printers has been spreading in schools as well, and 3D printers were newly introduced in the revised Junior High School Course of Study Guidelines for Technology and Home Economics and the Guidelines for th ... more
Papermaking technique is implicit knowledge based on many years of experience of craftsmen. In this study, we investigate the factors that cause the weight of Japanese paper to vary depending on the papermaking condition ... more
Feedback control, which is said to originate from a speed governor that controls the rotation of a steam engine, is widely used. However, the effect of the feedback control may be difficult to understand for beginner. Th ... more
The purpose of this paper is to estimate the manufacturing-related variation factor from the difference in variance and correlation of the high-precision physical model parameters for a miniature triode vacuum tube 5751 ... more
