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  • 中田 善久, 大塚 秀三, 岡本 圭市, 宮田 敦典
    日本建築学会技術報告集
    2016年 22 巻 52 号 847-850
    発行日: 2016年
    公開日: 2016/10/20
    ジャーナル フリー
    This paper deals with consideration in
    boom
    operation changed length of tip horse to
    boom
    and posture of
    boom
    in placing concrete by pumping method. Therefore, Quality variation of concrete after pumping show a tendency to almost equal in length pipe for
    boom
    . Pressure line for
    boom
    should be consideration that length extended pipe line is longer. In addition, Posture of
    boom
    should be consideration that take measures to prevent overload for
    boom
    as much as type M keep.
  • Norio Usui
    The International Economy
    1996年 1996 巻 2 号 21-47
    発行日: 1996/03/28
    公開日: 2010/07/07
    ジャーナル フリー
    This paper analyzes the effects of two policy adjustments, namely exchange rate devaluation and the accumulation of budget surpluses, to the oil export
    boom
    in Indonesia. Our results indicate that exchange rate adjustment had a significant impact on expansion of tradable sectors, especially the manufacturing sector, by reversing the real exchange rate. While of maintaining the balanced budget principle, the government exercised delicate operations whereby the budget surpluses were covertly accumulated as government deposits. These policy adjustments were consistent from a macroeconomic management point of view and have contributed to avoiding the ‘Dutch Disease’ stemming from abundant oil revenue.
  • 水木 和磨, 石川 潤
    電気学会論文誌D(産業応用部門誌)
    2023年 143 巻 11 号 719-727
    発行日: 2023/11/01
    公開日: 2023/11/01
    ジャーナル 認証あり

    This paper proposes a gain-scheduling control method to stabilize the slewing angular velocity even with variations in crane

    boom
    length and perturbations in the controlled-plant model. The model used in the proposed gain-scheduling control system is identified through experiments on an actual crane, and are derived under three
    boom
    length conditions. Specifically, the model is expressed as the sum of four vibration modes and a time delay, and its parameters are identified. By linearly interpolating the three models, the gain of a type-one control system including an observer is designed for each 0.5m
    boom
    length, after considering the time delay. The proposed gain-scheduling control is realized by selectively applying these gains according to the
    boom
    length. In an experiment to verify the effectiveness of the proposed method, a step reference was input for the slewing angular velocity while extending the
    boom
    length, and its time response was compared to that of a single controller designed for a
    boom
    length of 20m (midpoint). The experimental results showed that the time response of the single controller deteriorated when the
    boom
    length of the crane was extended, especially beyond 20m, while the proposed method was able to stably control the slewing angular velocity of the crane even when the
    boom
    length reached 30m.

  • 岸 祐希, 牧野 好和, 金崎 雅博
    航空宇宙技術
    2020年 19 巻 1-9
    発行日: 2020年
    公開日: 2020/01/07
    ジャーナル 認証あり

    The purpose of this study is to validate the utility of a forward-swept wing in significant reducing the acoustic level of the sonic

    boom
    during a supersonic cruise. This was achieved by investigating the aerodynamic performance of wings with different leading edge angles. A total of 13 wing-body-engine nacelle configurations were defined with varying outer wing planforms for a supersonic business jet model. The resulting aerodynamic drag was evaluated using the three-dimensional compressible Euler equation, and the acoustic level of the sonic
    boom
    was evaluated using the augmented Burgers equation. The calculated results for supersonic cruise conditions indicated that the maximum acoustic level of the sonic
    boom
    of a forward-swept wing was approximately 4.8 PLdB lower than that of the original backward-swept wing. Furthermore, a forward-swept wing reduced the aerodynamic drag as effectively as a backward-swept wing during supersonic cruising. The sonic
    boom
    signature at the ground level indicated that forward-sweeping of the wing caused obvious multi-peaks on the bottom peak of the trailing sonic
    boom
    , which demonstrated that the forward-swept wing could reduce the intensity of trailing sonic
    boom
    .

  • 飯田 隆
    経営史学
    1993年 28 巻 3 号 30-54,ii
    発行日: 1993/10/30
    公開日: 2009/11/06
    ジャーナル フリー
    This paper deals with the new capital issue
    boom
    in the London capital market during the period of 1918-1920 and how large companies in those days committed themselves in the
    boom
    . Previously this
    boom
    has been characterized as essentially domestic and prominent with large issue by leading companies. However, it should also be pointed out that there were many speculative issues which were not connected with industrial development in the process of the
    boom
    .
    In order to clarify whether the
    boom
    played an important role in domestic capital formation or merely a speculative one, we have analyzed the amount of new capital raised by the issue, and the proportion of capital used for spending on equipment outlays in each issue, utilizing the prospectuses of companies and other documents.
    As a result of this investigation, we concluded that the
    boom
    had a great significance for the development of British industries, especially large companies belonging to the so-called heavy industrial sector. Though many large companies made considerable use of bonus issues during the period, they also expanded their assets substantially by new capital issues in the capital market.
    However, there were some instances of companies which had to face difficulties connected with the heavy burden of over-capitalization in the 1920's. These companies had to discover means for effective management of huge assets. For these reasons, the postwar capital issue
    boom
    had an important role in the rise of the corporate economy in Britain after the First World War.
  • 白子 正高, 荒木 孝二, 杉山 吉彦, 本田 尚義, 中村 揚介, 岩丸 康範, 棚橋 秀行
    日本航空宇宙学会論文集
    2007年 55 巻 643 号 406-410
    発行日: 2007年
    公開日: 2007/09/10
    ジャーナル フリー
    The paper reports design process of a space
    boom
    to be installed in a 50kg-class micro-satellite, tentatively called as SOHLA-1. The total mass of the
    boom
    is 483g, while the length of the
    boom
    is 416mm. A spring-string type pin-puller was proposed. Vibration test with a bread-board model (BBM) of the
    boom
    leaded to an engineering model (EM) of the
    boom
    accommodated with a two-pin type pin-puller. Vibration test with the
    boom
    EM suggested some modifications to be made for a proto-type model (PM) of the
    boom
    . Vibration test, deployment test and thermal test on the
    boom
    PM confirmed feasibility of the flight model (FM) of the
    boom
    .
  • 佐原 宏典, 渡部 武夫, 渡邊 秋人, 伊藤 裕明
    航空宇宙技術
    2012年 11 巻 15-22
    発行日: 2012年
    公開日: 2012/01/31
    ジャーナル フリー
    This paper reports a development and demonstration of inflatable extension
    boom
    in the experiments of the ISAS/JAXA sounding rocket, S-520-25. The inflatable extension
    boom
    developed by the authors is the longest in ones with conductive part to work as an electrode for collection of electrons surrounding the rocket. S-520-25 sounding rocket was launched in August 31, 2010, and 5 experiments including an extension of the inflatable
    boom
    were conducted. The inflatable extension
    boom
    and its system worked very well with no problem to form 4-m-long electrode in space.
  • 大久保 正幸, 豊田 篤, 山下 博, 小川 俊広, 大林 茂, 清水 克也, 鈴木 角栄, 松田 淳, 佐宗 章弘
    日本航空宇宙学会論文集
    2011年 59 巻 688 号 119-125
    発行日: 2011年
    公開日: 2011/05/30
    ジャーナル フリー
    To examine the possibility of sonic
    boom
    mitigation by the supersonic biplane with a fuselage, two kinds of wing-fuselage models for the ballistic range experiment were designed by using CFD simulations. One was the low-
    boom
    model with a blunt nose and the other was the high-
    boom
    model with a spike nose. From the CFD result, the near-field pressure strength from the low-
    boom
    model becomes 70% of that of the high-
    boom
    model. The far-field pressure peak of the low-
    boom
    model becomes 85% of that of the high-
    boom
    model. To verify the near-field pressure signature calculated by CFD, the experimental model using the supersonic biplane with a finite-thickness leading edge was designed and launched with the ballistic range. As a result, the reliability of the CFD result was confirmed.
  • Sota Suzuki, Saburo Matunaga, Hiroshi Furuya, Yasuyuki Miyazaki, Akito Watanabe
    The Proceedings of the Asian Conference on Multibody Dynamics
    2016年 2016.8 巻 16_1288864
    発行日: 2016年
    公開日: 2017/06/19
    会議録・要旨集 認証あり

    In this research, the folding and unfolding properties of the bi-convex

    boom
    whose edges are combined using slide fasteners are evaluated experimentally. The bi-convex
    boom
    is the extension
    boom
    which have superior features such as lightweight, highly rigid and storable. We propose the method of forming closed cross section by combining convex booms using slide fasteners. Folding and unfolding tests under hanging gravity compensation are conducted using trail product of this
    boom
    . And the folding and unfolding properties of the
    boom
    are evaluated. Consequently, the
    boom
    bended in folding because of the low restoring force from pressed cross section to circular cross section. So we added the guide rollers to the unfolding and unfolding mechanisms in order to raise the restoring force of the
    boom
    . And we indicate that it is possible to unfold normally using this unfolding and unfolding mechanisms added guide rollers.

  • Kolawach CHALERMPONG, Shuichiro HIRATA, Hiroshi YAMAURA
    Mechanical Engineering Journal
    2022年 9 巻 5 号 22-00231
    発行日: 2022年
    公開日: 2022/10/15
    [早期公開] 公開日: 2022/09/01
    ジャーナル オープンアクセス

    Vibration is one of the significant problems in crane operation. In the rotary crane, the

    boom
    is a flexible structure. The vibration in this crane is occurred at the
    boom
    and the hoisted load. This research proposed a control strategy for designing the optimal trajectory of the rotary crane with a flexible
    boom
    , which can suppress the vibration in the mechanism. In the proposed approach, the simplified dynamics model of the flexible rotary crane was introduced for designing the control trajectory. The
    boom
    ’s flexibility was modeled with mass-spring systems. The constant-velocity access control method and the point-to-point access control method were used to design the vibrationless trajectory. To estimate the efficiency of the proposed model, the numerical simulation and experiment on the laboratory-scale flexible crane were conducted to measure the motion of the
    boom
    tip and hoisted load. The results were compared with those from the vibration control model that did not include the
    boom
    ’s flexibility. The simulation and experiment results illustrated that the proposed control model with the flexibility of
    boom
    was able to suppress the vibration of both
    boom
    and hoisted load. Furthermore, the proposed model showed a better vibration suppression than the model that neglected the
    boom
    ’s flexibility when the crane was driven at high acceleration.

  • 溝渕 久美子
    映像学
    2005年 75 巻 65-81,123
    発行日: 2005/11/25
    公開日: 2023/03/31
    ジャーナル フリー

    The purpose of this paper is to cast new light on the so-called “bungei eiga” (literature film)

    boom
    and the critical discourses on the
    boom
    in 1930s. This
    boom
    has been understood in terms of the introduction of sound film, but such an understanding simplifies the matter too much. The
    boom
    can be better understood if we take into account the historical context of Japanese literature at the time. The “bungei fukkou” (revival of literature) movement of the time tried to revive “junbungaku” (pure literature) by creating more accessible works with a high standard. The film industry apparently tried to raise the status of films and attract new audiences by adapting such works, which resulted in the “bungei eiga”
    boom
    . The critical discourses on the films classified as “bungei eiga” can be seen in a new light by keeping such literary and industrial contexts in mind. Even the critics who criticized individual films seemed to accept that the original writings classified as “junbungaku” were valuable; the films were blamed because they failed to capture the value of the original works. This framework of criticism presupposed that movies could become valuable by adapting valuable literature, and this presupposition was in accordance with the purpose of the “bungei fukkou” movement and the intentions of the film industry.

  • 高梨 成次, 菅野 高弘
    交通・物流部門大会講演論文集
    2002年 2002.11 巻
    発行日: 2002/12/10
    公開日: 2017/06/19
    会議録・要旨集 フリー
    The container crane received large damage in the 1995 Hyogoken-Nanbu earthquake. In order to confirm the behavior of the container crane, the shaking table tests were carried out by using 1/15 scale model. Two kinds of states of the crane were examined. One was the state of the
    boom
    down (working) and another one was the state of the
    boom
    up (resting). The rocking with uplifting of legs of container cranes was observed in the state of the
    boom
    down, and was not in the state of
    boom
    up. Therefore, the bending moment at the damaged member in the state of the
    boom
    down was 1.25 times the bending moment in the state of the
    boom
    up. The numerical analysis simulation result showed the experiment result and a good agreement including the residual stress.
  • 栖原 二郎
    西部造船会々報
    1964年 28 巻
    発行日: 1964/09/30
    公開日: 2018/02/24
    会議録・要旨集 フリー
    Factors to be considered for the study of a derrick
    boom
    can be given as follows: 1. Lifting load, 2. Axial force, 3. End morment acting near the top of the
    boom
    which is caused by the brackets to rig the purchese blocks and derrick head span block, 4. Self weight of the
    boom
    , 5. Tapering of the
    boom
    , 6. Ratio of effective mast hight and
    boom
    length, (See Fig. 4) 7. Angle between
    boom
    centre line and horizontal plane, 8. Effect of additional weights, i.e., weight of blocks, hook and wires etc., Standard statical strength calculation is usually made on the "Swinging", however "Burtoning" is so often used for most of cargoes. In this paper stresses arisen in the
    boom
    working in the "Burtoning" condition are studied statically as well on the dynamical effect of the lifting load for the case of "Swinging" when the winch drum is suddenly braked. JIS (Japanese Industrial Standard)
    Boom
    are designed based on approximate formulae for stresses and buckling loads obtained by the use of Galerkin's method for the sake of the simplicity of the calculations. In this paper the accuracies and the results of using these formulae are checked by comparing the sufficiently accurate and successive numerical solutions of the equation of the tapered
    boom
    subjected bending with compression by use of Digital Computer OKITAC 5090A. Results of the calcutations for JIS derrick booms are shown in figures and tables. Scantlings of JIS Booms are expected to change slightly for simultaneous fulfilment of JIS and AB Requirements for designing of booms, if the yield point of material of
    boom
    is taken as 23kg/mm^2.
  • Mao Terashima, Daisuke Morikawa, Parham Mokhtari, Tatsuya Hirahara
    Acoustical Science and Technology
    2021年 42 巻 6 号 344-349
    発行日: 2021/11/01
    公開日: 2021/11/01
    ジャーナル フリー

    This article describes a linear microphone array used for measuring head-related impulse responses simultaneously at various radial distances using the reciprocal method. The microphone array consists of miniature 5.8 mm diameter electret condenser microphones (ECMs) arranged on a

    boom
    , using a 3D printed microphone holder with pillars. The frequency response of the ECM with the 1 mm thick band holder increased monotonically above 5 kHz and was 2 dB higher at 20 kHz compared to the frequency response of the bare ECM. When multiple ECMs were arranged on a
    boom
    at 200 mm intervals using microphone holders with a 3 mm diameter pillar, reflections from the pillar and
    boom
    were negligible, regardless of whether the height of the ECM from the
    boom
    was 30 mm or 60 mm.

  • *Danny Tholen, Carolina
    Boom
    , Ko Noguchi, Ichiro Terashima
    日本植物生理学会年会およびシンポジウム 講演要旨集
    2007年 2007 巻
    発行日: 2007年
    公開日: 2007/12/13
    会議録・要旨集 フリー
    Photosynthesis is affected by the conductance of CO2 from the atmosphere to the site of carboxylation. The location of chloroplasts in the mesophyll cells may affect the length of the diffusion pathway for CO2. Using different light treatments to induce chloroplast movements we studied the effect of chloroplast location on a number of photosynthetic parameters in Arabidopsis thaliana. In addition, we examined these parameters in mutants which do not show a chloroplast avoidance response under high light conditions. Furthermore, we investigated the internal conductance after externally applying an inhibitor of chloroplast movement. Following gas-exchange measurements we sampled the leaves for anatomical measurements to quantify the length of the diffusion pathways. Our results indicate that chloroplast movement affects internal conductance for CO2, and this in turn exerts a small effect on the photosynthetic capacity in A. thaliana.
  • Hiroshi ITO, Yoshihiro SENDA, Hideki FUJIMOTO
    Bulletin of JSME
    1978年 21 巻 154 号 600-608
    発行日: 1978年
    公開日: 2008/02/15
    ジャーナル フリー
    This paper deals with the behavior of a load lifted by a mobile crane during
    boom
    hoisting, and during
    boom
    hoisting and lowering which are executed at the same time. The equations of motion are given in the form of Lagrange's equation, and the solutions are obtained by Runge-Kutta-Gill method. In experiments the rope tension was measured with load cells, and displacements of the load and the
    boom
    point were measured with cameras and sound-wave. In conclusion, the theoretical analysis is verified, since the theoretical values are in good accord with the experimental values.
  • Aki MIKKOLA, Heikki HANDROOS, Erkki NIEMI
    Proceedings of the JFPS International Symposium on Fluid Power
    1996年 1996 巻 3 号 361-366
    発行日: 1996年
    公開日: 2011/11/08
    ジャーナル フリー
    The present paper shows the investigation of the fatigue life of a hydraulic servo controlled log crane
    boom
    structure. The coupled dynamics of the hydraulic driven log crane is simulated using ADAMS. After analyzing the dynamics of the system the results obtained are utilized in the ANSYS finite element program to determine the stress history of the
    boom
    . During the simulation the stress range occurrences are calculated using Rainflow-algorithm. The fatigue life at a certain location of structure is then calculated by means of the hot spot stress approach. In this approach the fatigue strength, in form of S-N curves, is based structural hot spot stresses.
    By employing the designing method mentioned above the effects of variations in the parameters of a P-, PD-and P+acceleration feedback joint controllers on the fatigue life of a crane
    boom
    structure are investigated. The goal of the study is to highlight the importance to compromise between the control properties and fatigue life in the design of a servo controlled working machine
    boom
    .
  • Huimin OUYANG, Naoki UCHIYAMA, Shigenori SANO
    Journal of System Design and Dynamics
    2011年 5 巻 7 号 1418-1432
    発行日: 2011年
    公開日: 2011/11/30
    ジャーナル フリー
    Generally, both horizontal and vertical
    boom
    motion must be used to suppress the load sway caused by horizontal
    boom
    motion of a rotary crane. However, it would be less energy intensive and also safer if a control scheme could be developed that only used horizontal
    boom
    motion, i.e., without the need for any vertical
    boom
    motion. In addition, if load sway can be suppressed without measuring it, reduction in sensor cost can be achieved. Furthermore, employing simple velocity trajectory patterns such as trapezoidal and S-curve patterns, which are widely used in industrial automation systems, may provide cost effective controller implementation. This study presents a simple S-curve trajectory generation method for rotary crane motion that can suppress residual load sway using only horizontal
    boom
    motion without load sway sensing. Numerical simulations and experimental results demonstrate the effectiveness of the proposed method.
  • Huimin OUYANG, Naoki UCHIYAMA, Shigenori SANO
    Journal of System Design and Dynamics
    2011年 5 巻 4 号 535-546
    発行日: 2011年
    公開日: 2011/06/20
    ジャーナル フリー
    Horizontal motion of booms in rotary cranes typically generates undesirable two-dimensional load-sway; therefore, crane operators must be highly skilled to control the crane's motion. To reduce the burden on human operators, automatic control systems that can simultaneously control the
    boom
    's position while suppressing unwanted load-sway have been widely investigated. In most existing control schemes, both horizontal and vertical
    boom
    motion must be used to suppress load-sway. However, it would be less energy intensive and indeed safer if a control scheme could be developed that only utilized horizontal
    boom
    motion, i.e. without the need for any vertical motion. In this paper, we present a nonlinear controller design that enables both
    boom
    positioning and load-sway suppression using only horizontal
    boom
    motion. Numerical simulations and experimental results demonstrate the effectiveness of the proposed method.
  • *渡邊 健太, 𠮷川 真実, 石川 潤
    ロボティクス・メカトロニクス講演会講演概要集
    2018年 2018 巻 1P2-A03
    発行日: 2018年
    公開日: 2018/12/25
    会議録・要旨集 フリー

    This article proposes a damping control of a suspended load for crane systems in consideration of crane

    boom
    deflection. Many researches on transporting and anti-swaying control of cranes have been reported. However, most of those researches, crane
    boom
    is modeled as a rigid body. It might not be necessary for cranes with short booms to consider this kind of deflection, but for long-
    boom
    cranes the deflection would become bigger and should be consider during controller design. In the proposed system, the
    boom
    deflection as well as the time delay in the system is explicitly considered and is incorporated into the controlled plant mode. The experimental results showed that the attenuation for the
    boom
    deflection and the load sway becomes better by using the proposed method.

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