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Aerodynamic and Flow Characteristics of Tall Buildings with Various Unconventional Configurations
Tanaka, Hideyuki,Tamura, Yukio,Ohtake, Kazuo,Nakai, Masayoshi,Kim, Yong Chul,Bandi, Eswara Kumar Council on Tall Building and Urban Habitat Korea 2013 International journal of high-rise buildings Vol.2 No.3
Tall buildings have been traditionally designed to be symmetric rectangular, triangular or circular in plan, in order to avoid excessive seismic-induced torsional vibrations due to eccentricity, especially in seismic-prone regions like Japan. However, recent tall building design has been released from the spell of compulsory symmetric shape design, and free-style design is increasing. This is mainly due to architects' and structural designers' challenging demands for novel and unconventional expressions. Another important aspect is that rather complicated sectional shapes are basically good with regard to aerodynamic properties for crosswind excitations, which are a key issue in tall-building wind-resistant design. A series of wind tunnel experiments and numerical simulation have been carried out to determine aerodynamic forces and wind pressures acting on tall building models with various configurations: corner cut, setbacks, helical and so on. Dynamic wind-induced response analyses of these models have also been conducted. The results of these experiments have led to comprehensive understanding of the aerodynamic characteristics of tall buildings with various configurations.
3-Dimentional Block Placement of Force Directed Model with Cluster Growth
Hideyuki Tanaka,Katsumi Harashima 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Module placement is an important phase for LSI layout design. This paper proroses a three-dimensional placement method based on Force Directed Model (FDM). The random initial placement that is often used in most conventional FDMs causes a frequent collision on module movement. The frequent collision causes a delay of time to obtain placement and a fall of quality of a placement result. To overcome the weak points of conventional methods, the proposed method uses the wiring cluster growth method for an initial placement that can place high modules of a wiring demand near.
Verification of Speed-up Mechanism of Pedestrian-level Winds Around Square Buildings by CFD
Hideyuki Tanaka,Qiang Lin,Yasuhiko Azegami,Yukio Tamura Council on Tall Building and Urban Habitat Korea 2022 International journal of high-rise buildings Vol.11 No.4
Various studies have been conducted on pedestrian-level wind environments around buildings. With regard to the speed-up mechanism of pedestrian-level winds, there are references to downwash effect due to the vertical pressure gradient of boundary layer flow and venturi effect due to flow blocking by the building. Two factors contribute to increase or decrease of downwash effect: change in twodimensional / three-dimensional air flow pattern (Type 1) and change in downwash wind speed due to building size that does not accompany change in airflow pattern (Type 2). Previous studies have shown that downwash effect has a greater influence in increasing or decreasing the area of strong wind than venturi effect. However, these considerations are derived from the horizontal mean wind speed distribution at pedestrian level and are not the result of three-dimensional flow field around the building. Therefore, in this study, Computational Fluid Dynamics using Large Eddy Simulation were performed to verify the downwash phenomena that contributes to increase in wind speed at pedestrian level.
Visual Marker System for Control of Flexible Manipulator Supporting Daily Living
Hideyuki Tanaka,Tetsuo Tomizawa,Yasushi Sumi,Jae Hoon Lee,Yong Shik Kim,Bong Keun Kim,Tamio Tanikawa,Hiromu Onda,Kohtaro Ohba 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Structuring of environment is indispensable for practical application of domestic robots. We developed a supporting system for a service robot which is in practical use and assists human daily living. In this system, we used a flexible manipulator of which fine position control is difficult to conduct. In order to fulfill the precision requirement needed to autonomous object handling, we implemented a visual marker system which provides robots with assistive information for fine manipulation, combining with a visual servoing scheme. We verified the basic design of the marker system under a home environment through preliminary experiments.
Tanaka, Hideyuki,Matsuoka, Yasutomo,Kawakami, Takuma,Azegami, Yasuhiko,Yamamoto, Masashi,Ohtake, Kazuo,Sone, Takayuki Council on Tall Building and Urban Habitat Korea 2019 International journal of high-rise buildings Vol.8 No.4
We performed calculations combining optimization technologies and Computational Fluid Dynamics (CFD) aimed at reducing wind forces and mitigating wind environments (local strong winds) around buildings. However, the Reynolds Averaged Navier-stokes Simulation (RANS), which seems somewhat inaccurate, needs to be used to create a realistic CFD optimization tool. Therefore, in this study we explored the possibilities of optimizing calculations using RANS. We were able to demonstrate that building configurations advantageous to wind forces could be predicted even with RANS. We also demonstrated that building layouts was more effective than building configurations in mitigating local strong winds around tall buildings. Additionally, we used the Convolutional Neural Network (CNN) as an airflow prediction method alternative to CFD in order to increase the speed of optimization calculations, and validated its prediction accuracy.
Kaoru Yamashita,Akira Tsuchitani,Hideyuki Murakami,Masanori Okuyama,Shigeru Arita,Tsunehisa Tanaka,Yaowu Mo,Yoshihiko Suzuki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Arrayed ultrasonic microsensors using piezoelectric PZT (Pb(Zr,Ti)O3) thin lms on micromachined silicon diaphragms have been fabricated and combined with BBD (Backet Brigade Device) for signal processing. The ultrasonic sensors are designed to compose an electrical phased array for three-dimensional object detection in air. The resonant frequencies of the elements were scattered in the error range of 12 % and the objects could not be detected due to the beat in the sum of delayed element waveforms. Each element has been tuned by adequate poling less than 10 V to make its resonant frequency equal to a center value. The frequency scattering was reduced within the range of 2 % and the tuned array could give the objects by summing up of the delayed signals. Three-dimensional object detection has been demonstrated using the tuned sensor combined with the BBD delay circuit.4