著者

杉村 卓 野崎 政治 鈴木 輝雄

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1966, no.119, pp.209-220, 1966

被引用文献数

3

---

In this paper the results of the destructive experiment of a 1/5 scale ship hull model is reported. The model was designed to be as similar as possible to the midship part of the destroyer escort and subjected to pure bending moment.<BR>The general buckling strength of the upper deck was mainly studied considering the effects of under-deck structures.<BR>A loading device was specially constructed for this experiment.<BR>Buckling of the upper deck occured over two frame spaces and its load agreed with a theoretical estimation.

著者

鈴木 英之 柴田 創 藤岡 弘幸 平林 紳一郎 石井 希実子 菊池 紘樹

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本船舶海洋工学会論文集 (ISSN:18803717)

巻号頁・発行日

vol.18, pp.81-90, 2013

被引用文献数

3

---

Rotor-floater-mooring coupled response analysis is essentially important for design of Rotor Nacelle Assembly (RNA) and floating support structure of Floating Offshore Wind Turbine (FOWT). The authors have developed an analysis code UTWind for the analysis of the coupled response. Blades and floater are modeled as frame structure with beam elements. Lumped mass model is use for mooring. Aerodynamic load on blade is calculated by Blade Element Momentum Theory (BEM), and hydrodynamic load is calculated by Hooft's method, and Morison equation was modified to be applicable to cylindrical element with cross section with two axes of line symmetry. The equations of motion of rotor, floater and mooring are solved in time domain by weak coupling algorithm.The numerical results by the code were compared with experimental results in wave and wind-wave coexisting condition with/without blade pitch control and showed good agreement. Response by negative damping was reproduced by the code and showed good agreement with experiments.

著者

宝田 直之助

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1961, no.110, pp.57-64, 1961 (Released:2009-07-23)

参考文献数

11

---

Analysis of the circle test on the actual ship has made it clear that even a low approach speed has influence on the turning circle and that a change in the helm angle tells on the turning circle due to the aspect ratio of the rudder. By making use of these results as well as that of the model test, the Hovgaard-Schoenherr formula was modified, and K3 value was sought with B/d as parameter.In this way the turning circle has come to be estimated very simply.

著者

隆杉 憲行

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1991, no.169, pp.123-134, 1991 (Released:2009-09-04)

参考文献数

12

---

The automatic position and the attitude control for the underwater vehicle staying still or moving at dead slow speed becomes non-linear, because the acceleration or the deceleration motion must be applied using thrusters, while the linear control system can be applied to the underwater vehicle cruising at high speed.In the previous paper, the linear approxmation of this non-linear system and a linear design method were proposed.This paper describes the results of the sea tests of the experimental underwater vehicle, and the evaluations made by the test results which proved the thory and the design method proposed in the previous paper to be applicable to the control of these underwater vehicles.

著者

隆杉 憲行

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1990, no.168, pp.283-295, 1990 (Released:2009-09-16)

参考文献数

13

---

This paper treats the automatic position and the attitude control for the underwater vehicle staying still or moving at dead slow speed.The motion control of the underwater vehicle cruising at high speed is rather easy and now in practical use successfully, because the hydrodynamic characteristics and the dynamics of the vehicle can be assumed to be linear, which allows application of linear control system using control surfaces.But the position and the attitude keeping control of the underwater vehicle staying still or moving at dead slow speed becomes non-linear system, because the speed of all degrees of freedom becomes comparable and the acceleration or the deceleration motion must be applied using thrusters.This paper describes the linear approximation of this non-linear system, and presents a linear design method.

著者

山北 和之

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1985, no.157, pp.119-125, 1985 (Released:2010-05-07)

参考文献数

3

---

This report presents the longitudinal dynamics of underwater towed body system.Firstly, the longitudinal equations of motion of underwater towed body system were derived by treating the cable as lumped parameter system of discrete masses.Secondary, hydrodynamic characteristics of the hypothetical towed body, which is necessary for the analysis, were obtained experimentally. Utilizing above results, the longitudinal equations of motion of underwater towed body system under external disturbances were solved numerically.As the result, dynamic characteristics of underwater towed body system, mainly towed body response to the heaving towing point, were made clear.

著者

鈴木 勝雄 日比 茂幸

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本船舶海洋工学会論文集 = Journal of the Japan Society of Naval Architects and Ocean Engineers (ISSN:18803717)

巻号頁・発行日

no.17, pp.1-8, 2013-06-01

参考文献数

8

---

The perturbed complex potentials representing flows around a vertical plate semi-submerged in a uniform stream are derived in analytical forms by the reduction method. They are composed from the regular solution and the weak singular eigen solutions. The linear combinations of them represent some flows such as regular flow, zero-vertical flux flow, flow satisfying Kutta condition and wave-free flow. The wave resistances of the flows are also obtaied in analytical forms. The analytical solution obtained by Bessho-Mizuno(1962) has a possibility that it dose not satisfy the boundary condition on the plate.

著者

谷口 中

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1955, no.96, pp.17-24, 1955 (Released:2007-05-28)

参考文献数

4

---

The 1st Mitsubishi Experimental Tank was built in 1908 at Akunoura, Nagasaki by Denny Brothers Co., England, This tank was closed in 1943 and a new one was built at Urakami, Nagasaki. The new tank started its work from Jan., 1944. But this was severely destructed by the Atomic Bomb on 9. Aug., 1945, just before its completion. After the war, we continued enthusiastic endeavours for the restoration of the tank. And last autumn, this new experimental tank was completed. The tank is 285m long, on which 7m paraffin modelship and 500mm dia. model propeller are used as standard size ones, At one end of the tank, 30HP-wave maker is installed which can produce regular waves, max. 8m long 40cm high. The towing carriage is moved by four 25HP-motors and regulated by electronic automatic speed regulator, The speed is preset before start and after acceleration, preset constant speed is automatically kept within ± 0.2% variation, max. towing speed is 9m/s.All facilities including carriages, dynamometers, model shaping machine, etc. are designed and manufactured by us. On 15.-16. Oct. last year, the Japanese towing tank conference was held at this tank commemorating its completion. Hereunder, the author wishes to give some details of this new tank.

著者

豊貞 雅宏 藤井 英輔 野原 和宏 川口 喜昭 有持 和茂 井坂 和実

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1987, no.161, pp.343-356, 1987 (Released:2009-09-16)

参考文献数

20

被引用文献数

8 10

---

It is well known that fracture toughness value is affected by strain rate. As for strain rate, the dependency of fracture toughness on fracture parameter rate has been usually studied. In the linear fracture mechanics, fracture parameter rate (dK/dt) is directly related to strain rate. However, in the non-linear fracture mechanics, the relation between fracture parameter rate (dδ/dt, dJ/dt) and strain rate has not yet been made clear. Therefore, in the safety assessment of real structures, non-linear fracture parameter can not be applied in case of which the effect of the strain rate on the fracture toughness needs to be considered.In this paper, fracture initiation point is assumed to be the tip of the intensely deformed non-linear zone defined by Rice, which is considered to show the maximum triaxial constraint. Then the strain rate at the supposed fracture initiation point is given in connection with remote strain rate which corresponds to the strain rate in non-cracked plate. By use of the newly difined strain rate, strain rate-temperature parameter is determined, which represents the effect of strain rate on fracture toughness. Compact tension tests and COD tests with different strain rate and temperature, as well as KId tests are carried out to verify above conception.

著者

乾 崇夫 菊池 義男 岩田 達三

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1956, no.100, pp.35-45, 1956 (Released:2009-09-16)

参考文献数

27

被引用文献数

2

---

Since 1944, when one of the present Authors (INUI) and his collaborator calculated mathematically the wave-making resistance of ships in a shallow sea, necessity has long been recognized for making further quantitative investigations regarding to the practical adaptability of the theory. The following notes are aimed for clarifying the still remained question to what extent such a linearized wave-making theory can be safely applied in cases of a restricted water (b=h=finite) as well as a shallow water (h=finite, b=infinitive), where h denotes the depth of a water, b the width.A 1.750 m mathematical model S-201, whose equivalent source distribution is known, is towed in the Tokyo University Tank at the depth of water h/L=1.371, 0.400, 0.300 and 0.200.Comparatively good coincidence has been obtained between the calculated and measured wavemaking resistance, excluding the narrow critical range of Fh=0.820.95 where the KREITNER'S non-linear restricted water effect is clearly observed especially at the shoalest depth h/L=0.200.

著者

乾 崇夫 菊池 義男 岩田 達三

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1956, no.100, pp.47-67, 1956 (Released:2010-01-25)

参考文献数

12

---

The wave profile measurements are made with two wall-sided, deep-drafted mathematical models (S-103, S-203) by applying the chemical film method, where the Benzoic Acid is effectively used for the first time, and found as pre-eminently suited to contrasting the flow phenomena on ship models such as wave profiles, initial still water lines, stream lines, and laminar flow area.Comparisons are also made between the calculated and the observed wave profiles.Coincidence is good along the models, but is unsatisfactory in the rear.The principal cause might be safely ascribed to the fact that the wake intesity is always extinguishedly strong just on the narrow band in the vertical symmetrical plane (y=0).Conclusions are then drawn that the present field of the mentioned comparisons between the theory and the observation must be extended from one dimension (on the line y=0, exclusively) to two dimensions, to which the photographic measurements by stereograph might be expected as essential.

著者

下村 芳弘 北沢 孝宗 乾 崇夫 梶谷 尚

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1979, no.146, pp.27-34, 1979 (Released:2009-09-04)

参考文献数

12

---

The low speed wave resistance theory developed by Baba4) and Maruo5) seems to be a promising theory to predict the wave resistance of conventional ships, because it includes the nonlinear effect of the free surface condition. The wave resistance curves calculated by the low speed theory, however, have large humps and hollows, and they do not agree with the measured7) 10) .In this paper, a refinement of the low speed theory is discussed by imposing the more accurate hull surface condition. The wavy source distribution added to satisfy the hull sruface condition is obtained numerically, and the wave resistance, the hull side wave profiles and the velocities around the hull surface are evaluated. The results coincide fairly well with the measured values, especially the humps and the hollows of the calculated wave resistance curves are remarkably reduced.It is ascertained that the added source distribution plays an important role to improve the low speed wave resistance theory, in spite that its strength is one-order smaller than that of the double model source.

著者

乾 崇夫 高幣 哲夫 熊野 道雄

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1960, no.108, pp.39-51, 1960 (Released:2009-09-16)

参考文献数

29

被引用文献数

3

---

As to the wave-interference phenomena connected with the bulb there have been presented two kinds of explanations : one being theoretical, and the other practical.Following the theoretical explanation, which is largely indebted to Havelock and Wigley, we may assume that the wave-making characterististics of the bulbous bow can be safely represented by an isolated point doublet. If admitted, this goes at once to the conclusion that the free wave patterns due to the fitted bulb can be intentionally put just in inverse phase or with strictly half wave-length difference against the main hull waves. This is nothing but the most desirable situation for us in view of promoting the maximum interfering merits of the bulb.On the contrary, the other explanation enforces, rather practically, too much importance of the virtual increment in the wave-making length of the hull which is caused by the bulb waves. In this way, it has long been believed that the reduced wave-making resistance accompanying the bulbous bow has much to do with its increased “effective wave-making length”. From this standpoint of view, it is suggested that, when any amount of bulb merit observed, the bulb waves must proceed by some intermediate fraction between 1/41/2 of ship wave length against the main hull waves. This means that from the bulbous bow we can expect only an incomplete interfering merit at the best.This report is aimed for the experimental determination of the existing conflict, mentioned above, with regard to the 'actual' phase-difference between the bulb waves and the hull waves. The wave analysis procedure is applied for the first time. The conclusion is that the theoretical treatment of the bulb which is introduced by Havelock and Wigley can be practically approved. A few remarks are also made on the two different phases of the hydrodynamical characteristics of the bulbous bow. Its corresponding system of singularities is represented by the combination of an isolated doublet with a continuous source distribution.The former has a positive and therefore the same sense with the latter in hull form characteristics, but has a negative and therefore the reverse sense in wave-making characteristics. This is the true reason why the wavemaking resistance is sometimes reduced remarkably with the bulbous form whose displacement is larger by its bulb than the original form.

著者

平松 秀基 道場 康二 豊田 政男

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.2002, no.192, pp.563-571, 2002 (Released:2007-05-30)

参考文献数

16

被引用文献数

7 8

---

Significance of investigation of ductile crack initiation characteristics in the evaluation of structure of integrity is on the increase. It is significant to predict ductile crack initiation in plastic forming of metal materials. A lot of examinations about ductile crack initiation behavior under high stress triaxiality for structural steels have been conducted using notched round bar tensile specimens. Satisfactory examination under low stress triaxiality, however, has not necessary been conducted thus far.Ductile crack initiation characteristics of aluminum alloy A 5083-O and high strength steel HT 950 under low stress triaxiality have been investigated using plate tensile specimens in this study. The critical equivalent plastic strain as a function of the stress triaxiality at ductile crack initiation has been estimated using FE analyses.The ductile crack initiation is triggered by secondary void nucleation under low stress triaxiality, and it is controlled by initial void growth under high stress triaxiality for A 5083-O. The ductile crack initiation is triggered by void nucleation under the wide range of stress triaxiality. The critical diameter of void at ductile crack initiation varies with stress triaxiality for both materials. The critical equivalent plastic strain at ductile crack initiation under low stress triaxiality is seemed to be overestimated by extrapolation using curve fitted to test results under high stress triaxiality on the assumption that critical void diameter would be constant.

著者

金 相賢 大和 裕幸

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.2000, no.188, pp.211-223, 2000 (Released:2009-09-16)

参考文献数

12

---

In this paper, the longitudinal control system for full-submerged hydrofoil based on wave prediction was proposed to exclude human operation and to improve the performance of contouring waves. The proposed control system consists of optimal preview servo system, Kalman filter and generation of future reference input and future wave disturbance.In the proposed control system, the wave disturbance and the wave elevation were filtered and predicted by using sensor signals, Kalman filter, 30th linear prediction model and the augmented system. Then the future reference input and the future wave disturbance were generated by using predicted wave disturbance and wave elevation, and were used to calculate the feedforward control input in the optimal preview servo system. And also the future reference was modified based on the significant wave height for ship height control.The simulation results show that the proposed control system has good performance of contouring waves in the follow sea and the hydrofoil regulates heave and pitch motion in low significant wave height and contours the waves in high significant wave height without human operation. And also the experiment was performed to confirm the algorithm of filtering of wave disturbance and hydrofoil motion, and calculation of wave elevation.

著者

岡村 尚昭

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1975, no.138, pp.118-127, 1975 (Released:2009-09-04)

参考文献数

18

被引用文献数

1 1

---

This paper is concerned with the development of a method for calculating the hydrodynamic characteristics of marine propellers in a viscous fluid.Firstly, the characteristics in a non-viscous fluid are calculated by applying the propeller lifting surface theory and at each propeller section, a so-called corresponding two-dimensional wing which has the same hydrodynamic property and geometrical thickness distribution as the corresponding propeller section, is derived from the calculated circulation distribution. Then circulations corrected by the effects of viscosity and drag coefficients of propeller sections are obtained by using calculated boundary layer properties of the corresponding two-dimensional wings. Finally, the propeller characteristics in a viscous fluid can be obtained from these circulations and drag coefficients.Calculated results of propeller performances are compared with open-water test results and agreement between calculation and experiment is good. Also scale effects of propeller performance are examined by this method.

著者

岸 進 宇都 正太郎 加納 敏幸 上園 政裕 川島 義伸 泉山 耕

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1996, no.180, pp.99-111, 1996 (Released:2009-09-16)

参考文献数

19

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The patrol icebreaker “TESHIO” was built and delivered to the Japan Maritime Safety Agency in Autumn 1995. Full-scale trials in ice were conducted at the Sea of Okhotsk in February, 1996. Several kinds of test were performed in order to confirm her performance such as continuous ice-breaking, ramming and stopping performance, turning capability and zigzag course manoeuvrability, and coordinated ice-breaking operation together with the patrol icebreaker “SOYA”.While her design and construction were in process, series of model test were carried out both in ice and in ice-free water as the joint research project between Ship Research Institute, Ministry of Transport and NKK Corporation. At the ice model basins of the two organizations, comprehensive model tests in ice were conducted which included resistance and self-propulsion tests in various ice conditions, ramming and turning tests in level ice.This paper describes the results of model and full-scale tests of “TESHIO” and their correlation for both continuous ice-breaking and ramming performance.In order to predict the required BHP for the continuous ice-breaking in level ice, the propulsion coefficient was decomposed into three parts which denote effects of open water characteristics, overload and propulsor/ice interaction, respectively. The thrust deduction coefficient obtained from towed propulsion tests in ice showed very good agreement with that from overload tests in ice-free water. The predicted BHP showed good agreement with the full-scale results when the effect of propulsor/ice interaction was taken into consideration.A prediction formula for ramming penetration distance was devised using an energy-based method. Correlation of both the model and full scale data to the prediction results showed that thrust loss due to the propulsor/ice interaction and the automatic overload protection control of the main engine had much influence on the prediction of ramming performance.

著者

元良 誠三

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1960, no.107, pp.83-89, 1960 (Released:2009-09-16)

参考文献数

4

被引用文献数

3

---

In this paper, the author states about the results of measurement of added moment of inertia and damping coefficieut about y axis, i. e. for pitching motion.A forced oscillation method same as was used by Golovato was employed for measuring device, and 14 series models varying Cb and L/B are used.As the added moment of inertia and the damping of pitching motion vary with the frequency of the motion, values of them corresponding to the natural pitching frequency are choosen as the typical values when discussing the effect of ship forms.A chart from which additional moment of enertia and damping coefficent of ships having arbitrary Cb, L/B and d/B can be obtained is proposed in this paper.

著者

山内 重樹 手塚 研治

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1995, no.178, pp.707-712, 1995 (Released:2009-09-04)

参考文献数

4

被引用文献数

1 6

---

Nesting in shipbuilding is work that complicated parts of various sizes are arranged in steel plate as many as possible. The work has been done by experts. We have developed the automatic nesting system by use of Genetic Algorithm (GA) and new algorithm which are introduced from heuristic rules which the experts have. We call the algorithm “geometrical simplification of parts”, “pairing algorithm” and “grouping algorithm”. This paper describes that the combination with GA and new algorithm which we propose is effective to the processing speed of the system and the scrap ratio of nesting and that the system is available for practical use.