JP2002013923A - Method and device for measuring wave information by large floating body - Google Patents
Method and device for measuring wave information by large floating bodyInfo
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- JP2002013923A JP2002013923A JP2000195632A JP2000195632A JP2002013923A JP 2002013923 A JP2002013923 A JP 2002013923A JP 2000195632 A JP2000195632 A JP 2000195632A JP 2000195632 A JP2000195632 A JP 2000195632A JP 2002013923 A JP2002013923 A JP 2002013923A
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- vertical
- wave information
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本願に係る発明は、浮体の上
下動揺特性が波面の上下動と一致しないような大型の浮
体を用いた波浪情報の計測方法および装置に関する。本
件明細書において「波浪情報」とは、波高、波向、波周
期等の情報を指す。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring wave information using a large floating body whose vertical swing characteristics do not coincide with the vertical movement of a wavefront. In the present specification, “wave information” refers to information such as a wave height, a wave direction, and a wave period.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】従来の波
浪情報計測装置としては、海底設置型波高計（例えば特
開昭５２−１１９７３号公報）と波浪観測ブイ（例えば
特開平１０−１８５５６４号公報）が広く知られてい
る。2. Description of the Related Art Conventional wave information measuring devices include a seafloor type wave height meter (for example, Japanese Patent Application Laid-Open No. Sho 52-11973) and a wave observation buoy (for example, Japanese Patent Application Laid-Open No. 10-185564). Gazette) is widely known.
【０００３】ａ）海底設置型波高計では、海底に固定さ
れた装置から上向きに超音波を発信し海表面からの反射
を受信して波高計測するもの、もしくは、水圧計を海底
に固定し圧力変動から波高を計測するものがあるが、水
深の浅い沿海域に限定され、大水深海域や外洋には向か
ない。[0003] a) A seafloor-mounted wave height meter transmits an ultrasonic wave upward from a device fixed to the sea floor and receives the reflection from the sea surface to measure the wave height, or a water pressure gauge is fixed to the sea floor and the pressure is measured. Although there is one that measures wave height from fluctuations, it is limited to shallow coastal areas and is not suitable for deep seas or the open sea.
【０００４】ｂ）波浪観測ブイでは、海表面に浮かべた
小型ブイを係留し、その上下動の加速度を計測し、これ
を積分して波高を求める。B) In a wave observation buoy, a small buoy floating on the sea surface is moored, and the vertical acceleration of the buoy is measured and integrated to obtain a wave height.
【０００５】この方式では、表面ブイは波（海表面）の
上下動に追従していることが必須である。ブイが海表面
と同一の動きをするためには浮体は自ずと小型でなけれ
ばならず、係留ラインも軽くして上下動を拘束しないよ
うにする必要がある。 しかし、大水深海域での計測と
なれば、浮体を定置させるための係留ラインの重量や潮
流力が大きくなり、風力や潮流力等の外力が大きくな
る。これに対処するため表層浮体の排水量が大きくなる
と、係留ラインの影響も大きく現れ、浮体と海面の動き
に振幅や位相にずれが生じ、浮体の上下動が波高と一致
しなくなる。In this system, it is essential that the surface buoy follows the vertical movement of the wave (sea surface). In order for the buoy to move in the same way as the sea surface, the floating body must be naturally small and the mooring line must be light so as not to restrain vertical movement. However, if the measurement is performed in the deep sea area, the weight and the tidal force of the mooring line for fixing the floating body increase, and the external force such as the wind force and the tidal force increases. If the drainage amount of the surface floating body is increased to cope with this, the influence of the mooring line also appears greatly, the amplitude and phase of the movement of the floating body and the sea surface are shifted, and the vertical movement of the floating body does not match the wave height.
【０００６】したがって、水深の浅い沿海域で海面の動
きと同じ動きをする小型の浮体を設置して、海洋波の波
高や波周期等の情報を得る上記方式では、大水深海域や
外洋の波浪情報を精度良く推定することは困難である。[0006] Therefore, in the above-mentioned method in which a small floating body that moves in the same manner as the sea surface moves in a shallow coastal area to obtain information such as the wave height and wave period of the ocean wave, the wave in the deep sea area or in the open sea can be obtained. It is difficult to accurately estimate information.
【０００７】本願発明の目的は、波浪を起振力として動
揺が生じることに着目し、上下動揺特性が波面の上下動
と一致しない、大型の浮体を用い、理論計算または実験
的に求めた浮体の動揺特性を用いて、計測した動揺から
逆に大水深海域や外洋における波浪情報を精度良く推定
する波浪情報計測方法とその装置を提供することにあ
る。An object of the present invention is to focus on the fact that a wave is generated as a vibrating force, and to use a large floating body whose vertical oscillating characteristics do not coincide with the vertical movement of a wavefront, using a floating body obtained theoretically or experimentally. It is an object of the present invention to provide a wave information measuring method and a wave information measuring method for accurately estimating wave information in the deep sea area or the open sea from the measured shaking using the shaking characteristics of the wave.
【０００８】[0008]
【課題を解決するための手段】上記の課題を解決するた
めに、本願発明の特徴は、浮体の波浪動揺特性をシュミ
ュレーションや水槽実験等で求めて、これから海面上下
動に変換する式を解析し、これを用いて計測された浮体
の動揺情報を波浪情報に変換するところにある。In order to solve the above-mentioned problems, the feature of the present invention is to determine the wave oscillating characteristics of a floating body by a simulation or a water tank experiment, and to analyze an equation for converting the characteristics into a sea level up and down motion. Then, the motion information of the floating body measured using this is converted into wave information.
【０００９】その具体的な大型浮体による波浪情報計測
方法としては、第一に、上下動揺応答特性が波面の上下
動と一致しない大型の浮体を用いた波浪情報計測方法で
あって、シュミレーションや水槽実験等により予め浮体
の上下動の応答特性を推定してその動揺応答特性曲線を
求めておく一方、実際の浮体の上下方向加速度を計測
し、この加速度データに基づき浮体の実際の上下運動変
位データを積分演算して求め、この変位データと前記動
揺応答特性曲線とから波浪情報を求めるようにしたこと
を特徴とする。The wave information measuring method using a large floating body is firstly a wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of the wavefront. While the response characteristics of the vertical movement of the floating body are estimated in advance by experiments and the like and the shaking response characteristic curve is obtained, the actual vertical acceleration of the floating body is measured, and the actual vertical movement displacement data of the floating body is measured based on this acceleration data. Is obtained by integral calculation, and wave information is obtained from the displacement data and the oscillation response characteristic curve.
【００１０】これによれば、予めシュミレーション等に
よって推定した規則波中の浮体の動揺応答特性曲線を利
用して波高や波周期等の波浪情報を精度良く求めること
ができる。According to this, wave information such as a wave height and a wave period can be obtained with high accuracy by using a fluctuation response characteristic curve of a floating body in a regular wave estimated in advance by a simulation or the like.
【００１１】第二に、上下動揺応答特性が波面の上下動
と一致しない大型の浮体を用いた波浪情報計測方法であ
って、シュミレーションや水槽実験等により予め浮体の
上下動の応答特性を推定してその動揺応答特性曲線を求
めておく一方、実際の浮体の上下方向加速度を計測し、
この加速度データに基づき浮体の実際の上下運動変位デ
ータを積分演算して求め、この変位データを周波数分析
し、この周波数分析の結果と前記動揺応答特性曲線とに
より波浪情報を求めるようにしたことを特徴とする。Second, a wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of the wavefront. The response characteristic of the vertical motion of the floating body is estimated in advance by simulation, a water tank experiment, or the like. The vertical response of the floating body is measured,
Based on the acceleration data, the actual vertical motion displacement data of the floating body is obtained by integral calculation, the frequency of the displacement data is analyzed, and the wave information is obtained from the result of the frequency analysis and the motion response characteristic curve. Features.
【００１２】これによれば、予めシュミレーション等に
よって推定した規則波中の浮体の動揺応答特性曲線を利
用して不規則波の有義波高、最大波高、波周期などを精
度良く求めることができる。According to this, the significant wave height, the maximum wave height, the wave period, etc. of the irregular wave can be accurately obtained by using the fluctuation response characteristic curve of the floating body in the regular wave preliminarily estimated by a simulation or the like.
【００１３】第三に、上下動揺応答特性が波面の上下動
と一致しない大型の浮体を用いた波浪情報計測方法であ
って、シュミレーションや水槽実験等により予め浮体の
上下動（ヒーブ）、左右揺れ（スエイ）、前後揺れ（サ
ージ）、横揺れ（ロール）、縦揺れ（ピッチ）および船
首揺れ（ヨウ）の運動うち少なくとも３つの動揺の応答
特性を推定してその動揺応答特性曲線を求めておく一
方、実際の浮体の上下方向の加速度および角速度を計測
し、これらの加速度データおよび角速度データに基づき
浮体の当該３方向の運動変位データを積分演算して求
め、この変位データを周波数分析し、この周波数分析の
結果と前記動揺応答特性曲線とから波浪情報を求めるよ
うにしたことを特徴とする。Third, a wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of the wavefront. The method includes a vertical movement (heave) and a horizontal sway of the floating body in advance by a simulation, a water tank experiment or the like. (Sway), back and forth sway (surge), roll (roll), pitch (pitch), and bow (yaw) motions are estimated to determine at least three sway response characteristics and a sway response characteristic curve is obtained. On the other hand, the vertical acceleration and angular velocity of the actual floating body are measured, and the motion displacement data of the floating body in the three directions are calculated by integration based on the acceleration data and angular velocity data, and the displacement data is subjected to frequency analysis. Wave information is obtained from a frequency analysis result and the fluctuation response characteristic curve.
【００１４】これによれば、二次元波スペクトルを求め
ることも可能となり、波高や波周期の他に波向きなどに
関するより詳細な波浪情報を精度良く求めることができ
る。According to this, it is also possible to obtain a two-dimensional wave spectrum, and it is possible to accurately obtain more detailed wave information on the wave direction and the like in addition to the wave height and wave period.
【００１５】具体的な大型浮体による波浪情報計測装置
としては、第一に、浮体の上下動揺特性が波面の上下動
と一致しない大型の浮体を用いた波浪情報の計測装置で
あって、実際の浮体に設けた上下加速度センサと、この
加速度センサより計測した加速度データに基づき実際の
浮体の上下運動変位データを演算・解析する演算解析手
段と、シュミレーションや水槽実験等により予め求めて
いた浮体の上下動揺応答特性曲線を用いて前記演算解析
手段により求めた浮体の実際の上下動変位データから波
浪情報を計算する計算手段とを備えてなるものである。As a specific wave information measuring apparatus using a large floating body, first, a wave information measuring apparatus using a large floating body whose vertical oscillating characteristic does not coincide with the vertical movement of the wavefront is an actual wave information measuring apparatus. A vertical acceleration sensor provided on the floating body, calculation and analysis means for calculating and analyzing actual vertical movement displacement data of the floating body based on the acceleration data measured by the acceleration sensor, and a vertical movement of the floating body previously obtained by a simulation, a water tank experiment, etc. And calculating means for calculating wave information from actual vertical movement displacement data of the floating body obtained by the arithmetic analysis means using the motion response characteristic curve.
【００１６】これによれば、予めシュミレーション等に
よって推定した規則波中の浮体の動揺特性曲線を利用し
て波高や波周期等の波浪情報を精度良く求めることがで
きる。According to this, wave information such as a wave height and a wave period can be obtained with high accuracy by using a fluctuation characteristic curve of a floating body in a regular wave estimated in advance by a simulation or the like.
【００１７】第二に、浮体の上下動揺特性が波面の上下
動と一致しない大型の浮体を用いた波浪情報の計測装置
であって、実際の浮体に設けた上下加速度センサと、こ
の加速度センサより計測した加速度データに基づき実際
の浮体の上下運動変位データを演算・解析する演算解析
手段と、この演算解析手段により得られた上下運動変位
データに基づき周波数分析を行う周波数分析手段と、前
記シュミレーションや水槽実験等により予め求めておい
た浮体の上下動揺応答特性曲線を用いて、前記周波数分
析手段の結果から波浪情報を推定する波浪情報推定手段
とを備えてなるものである。Secondly, the present invention relates to a wave information measuring apparatus using a large floating body in which the vertical motion characteristics of the floating body do not coincide with the vertical motion of the wavefront, wherein a vertical acceleration sensor provided on an actual floating body and a vertical acceleration sensor are provided. Calculation analysis means for calculating and analyzing actual vertical movement displacement data of the floating body based on the measured acceleration data; frequency analysis means for performing frequency analysis based on vertical movement displacement data obtained by the calculation analysis means; Wave information estimating means for estimating wave information from the result of the frequency analysis means using a vertical motion response characteristic curve of the floating body obtained in advance by a water tank experiment or the like.
【００１８】これによれば、予めシュミレーション等に
よって推定した規則波中の浮体の動揺特性曲線を利用し
て不規則波の有義波高、最大波高、波周期などを精度良
く求めることができる。According to this, a significant wave height, a maximum wave height, a wave period, and the like of an irregular wave can be accurately obtained by using a fluctuation characteristic curve of a floating body in a regular wave estimated in advance by a simulation or the like.
【００１９】第三に、浮体の上下動揺特性が波面の上下
動と一致しない大型の浮体を用いた波浪情報の計測装置
であって、上下動、左右揺れ、前後揺れ、横揺れ、縦揺
れおよび船首揺れ運動のうち少なくとも３つの実際の浮
体の動揺を測るべく該浮体に設けた加速度センサや角速
度センサ等の動揺センサと、この動揺センサより計測し
た加速度データや角速度データに基づき実際の浮体の少
なくとも３つの当該運動変位を演算・解析する演算解析
手段と、この演算解析手段により得られた運動変位デー
タに基づき周波数分析を行う周波数分析手段と、前記シ
ュミレーションや水槽実験等により予め求めておいた浮
体の動揺応答特性曲線を用いて、前記周波数分析手段の
結果から波浪情報を推定する波浪情報推定手段とを備え
てなるものである。Third, a wave information measuring apparatus using a large floating body whose vertical oscillating characteristic does not coincide with the vertical movement of the wavefront, comprising a vertical movement, a horizontal sway, a front-back sway, a horizontal sway, a vertical sway, A sway sensor such as an acceleration sensor or an angular velocity sensor provided on the floating body to measure the sway of at least three actual floating bodies in the bowing motion, and at least three of the actual floating bodies based on acceleration data and angular velocity data measured by the sway sensor. Three calculation analysis means for calculating and analyzing the motion displacement; frequency analysis means for performing frequency analysis based on the motion displacement data obtained by the calculation analysis means; and a floating body previously obtained by the simulation, a water tank experiment, or the like. Wave information estimating means for estimating wave information from the result of the frequency analysis means using the fluctuation response characteristic curve of
【００２０】浮体の６つの運動変位のうち少なくとも３
つの運動変位を求めることにより、二次元波スペクトル
を求めことが可能となり、波高や波周期などに加えて波
向（波向分布）などの波浪情報をも精度良く得ることが
できる。At least three of the six motion displacements of the floating body
By obtaining two motion displacements, a two-dimensional wave spectrum can be obtained, and wave information such as wave direction (wave direction distribution) in addition to wave height and wave period can be obtained with high accuracy.
【００２１】[0021]
【発明の実施の形態】以下、本願発明の実施形態につい
て図面を参照しながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２２】図１は、本願が用いる浮遊型海洋構造物
（以下「浮体」という）１の正面図である。浮体１は大
型、すなわち、その上下動揺特性が波面（海面）ＷＬの
上下動と一致しない、大型の浮体である。浮体１は平面
的には円形で、断面的にみれば台形状をなしている。浮
体１の底面には係留ライン２が接続されていて浮体はあ
る喫水をもって海面ＷＬ上に浮遊している。浮体１には
櫓状の構造物３が立設されており、上部には風速・風向
センサ４、ＧＰＳアンテナ５等が設置されている。また
浮体１内にはデータ保存、処理、通信用ユニット（コン
ピュータ等）６が搭載されると共に、波浪情報計測のた
めの加速度センサ、角速度センサ７等が設置されてい
る。FIG. 1 is a front view of a floating marine structure (hereinafter referred to as “floating body”) 1 used in the present invention. The floating body 1 is a large floating body, that is, its vertical swing characteristics do not coincide with the vertical movement of the wavefront (sea surface) WL. The floating body 1 is circular in plan view and trapezoidal in cross section. A mooring line 2 is connected to the bottom surface of the floating body 1, and the floating body floats on the sea surface WL with a certain draft. A tower-like structure 3 is provided upright on the floating body 1, and a wind speed / wind direction sensor 4, a GPS antenna 5, and the like are provided on an upper portion thereof. A data storage, processing, and communication unit (computer or the like) 6 is mounted in the floating body 1, and an acceleration sensor, an angular velocity sensor 7, and the like for measuring wave information are provided.
【００２３】大型浮体を用いるメリットは、浅い海域か
ら大水深海域まで水深の制約を受けないで、また、暴風
時の波浪情報を全周波数帯域かつ高精度で計測できるこ
と、更には、浮体上に加速度計や風速、風向計などの各
種のセンサを搭載し、計算、記録用のコンピュータを搭
載することを可能とする点などにある。The advantage of using a large floating body is that it is not limited by water depth from shallow sea area to deep sea area, and that wave information at the time of a storm can be measured with high accuracy over the entire frequency band. It is equipped with various sensors such as a gauge, wind speed and anemometer, and can be equipped with a computer for calculation and recording.
【００２４】かかる浮体の運動には、図２に示すように
ヒーブ（上下揺れ）、スウェイ（左右揺れ）、サージ
（前後揺れ）の３軸、に加え、この各軸回りのピッチ
（縦揺れ）、ヨウ（船首揺れ）およびロール（横揺れ）
の６つがある。 Ａ． 規則波中の波浪情報の推定 まず、本願の基本的な思想を説明するため、規則波中に
おける波浪情報計測を例にとって説明する。図３は、こ
のような本願発明に係る波浪情報計測装置の機能ブロッ
ク図、図４は、この装置を用いた波浪情報計測方法のフ
ローチャート、そして図５〜９はその説明図である。 （１） 浮体の上下動（ヒーブ）の動揺応答特性曲線の
推定（ステップ１，２）まず、予めシュミレーションや
水槽実験で浮体の動揺応答特性を推定する。シュミュレ
ーションや水槽実験等によって浮体の波浪動揺特性を求
める手法は、海洋構造物の設計において確立された手法
であるので、ここでは簡単に述べる。As shown in FIG. 2, the movement of the floating body includes three axes of heave (vertical sway), sway (lateral sway), and surge (back and forth sway), and a pitch (pitch) around each axis. , Yaw (bow) and roll (roll)
There are six. A. Estimation of Wave Information in Regular Wave First, in order to explain the basic idea of the present application, measurement of wave information in a regular wave will be described as an example. FIG. 3 is a functional block diagram of such a wave information measuring device according to the present invention, FIG. 4 is a flowchart of a wave information measuring method using this device, and FIGS. (1) Estimation of the swing response characteristic curve of the vertical movement (heave) of the floating body (steps 1 and 2) First, the swing response characteristic of the floating body is estimated in advance by simulation or a water tank experiment. The method for obtaining the wave fluctuation characteristics of the floating body by simulation, a water tank experiment, or the like is a method established in the design of an offshore structure, and will be briefly described here.
【００２５】図５の正弦規則波９中に浮体１を浮かべ、
このときの浮体１の上下動の変位（上下揺れ振幅）Ｚａ
を下記運動方程式により求める。Floating body 1 is floated in sine wave 9 of FIG.
The displacement of the vertical movement of the floating body 1 at this time (vertical swing amplitude) Za
Is determined by the following equation of motion.
【００２６】[0026]
【数１】 (Equation 1)
【００２７】ここに、ａ，ｂ、ｃは係数であり、浮体の
形状等に依存し、ｂの減衰係数は粘性力の影響を含んで
いる。これらの係数はシュミレーションで求めるが、水
槽での模型実験によりチューニングする。右辺のＦｗ
（ｔ）は波強制力である。この運動方程式を解くと浮体
の上下動変位Ｚａが求まる。そして様々な規則波につい
て波周期ＴｗとＺａとの関係を求めれば、図６のような
規則波に対応した浮体の上下動に関する動揺応答（振
幅）特性曲線１０を求めることができる。この動揺応答
（振幅）特性曲線は後述する計測装置の解析装置８に入
力される。Here, a, b, and c are coefficients, which depend on the shape of the floating body and the like, and the damping coefficient of b includes the effect of viscous force. These coefficients are obtained by simulation, but are tuned by model experiments in a water tank. Fw on the right side
(T) is the wave forcing. By solving this equation of motion, the vertical movement displacement Za of the floating body is obtained. Then, if the relationship between the wave period Tw and Za is obtained for various regular waves, a fluctuation response (amplitude) characteristic curve 10 relating to the vertical movement of the floating body corresponding to the regular waves as shown in FIG. 6 can be obtained. This fluctuation response (amplitude) characteristic curve is input to an analysis device 8 of a measurement device described later.
【００２８】図６(a)は、動揺応答（振幅）特性曲線１
０を示す。縦軸には無次元振幅Ｚａ／ｈａ、横軸には波
周期Ｔｗをとって示す。ｈａは波振幅であり、波高Ｈｗ
との関係はＨｗ＝２ｈａである。なお、本明細書でいう
動揺応答特性曲線とは特にことわりのない限り応答振幅
特性曲線を意味する。FIG. 6 (a) shows a characteristic curve 1 of the oscillation response (amplitude).
Indicates 0. The vertical axis represents the dimensionless amplitude Za / ha, and the horizontal axis represents the wave period Tw. ha is the wave amplitude, and the wave height Hw
Is Hw = 2ha. In addition, the fluctuation response characteristic curve referred to in this specification means a response amplitude characteristic curve unless otherwise specified.
【００２９】このような動揺応答（振幅）特性曲線１０
を求めることにより、全波周期域にわたって補間手法は
不要となり、精度が高められる。Such a fluctuation response (amplitude) characteristic curve 10
, The interpolation method is not required over the entire wave period, and the accuracy is improved.
【００３０】図６(b)は、動揺応答（位相）特性曲線１
０ａを示す。縦軸には位相遅れεZ（＝ｔｌ／Ｔ×２π
、ｔｌは遅れ時間）、横軸には波周期Ｔｗをとって示
す。位相遅れは、波の運動に対して浮体の運動が遅れる
ことにより生じる。例えば、波の山頂部が浮体に当たっ
た後に、ある時間的な遅れをもって最も大きい浮体の動
揺が現れるときの位相遅れである。かかる位相遅れεZ
の影響は、後述する数式３に現れている。FIG. 6 (b) shows a fluctuation response (phase) characteristic curve 1.
0a is indicated. The vertical axis indicates the phase delay ε Z (= tl / T × 2π
, Tl are delay times), and the horizontal axis indicates the wave period Tw. The phase lag is caused by the movement of the floating body being delayed with respect to the movement of the wave. For example, this is a phase delay when the largest fluctuation of the floating body appears with a certain time delay after the top of the wave hits the floating body. Such a phase delay ε Z
The effect of appears in Equation 3 described below.
【００３１】なお、ヒーブ以外にピッチ、ロールなどを
求めて、より詳細な波浪情報を求める方法は後述する。A method for obtaining more detailed wave information by obtaining a pitch, a roll and the like in addition to the heave will be described later.
【００３２】上記動揺応答特性曲線１０から明らかなよ
うに、小さな波周期（さざなみ程度）では大型浮体は波
振幅ｈａに追従せず、大きな波周期（大きなうねりを持
った波）では波振幅ｈａと浮体上下運動は一致するよう
になる、つまり、波に完全に追従して浮体が動揺するよ
うになる。図に示す例で、例えば波周期Ｔｗが２０秒位
ではＺａ／ｈａが１．０となり浮体が波と同じ運動する
ことを示している。 （２）海面に浮遊した実際の浮体の上下加速度等を計測
（ステップ３，４）実際の浮体１において、上下加速度
センサ７ａにより浮体の上下方向の加速度を計測する。
このとき、浮体の傾斜の影響を除去して上下方向の加速
度成分を抽出するするため、角速度センサ７ｂにより浮
体の角速度を計測することが好ましい。As is clear from the oscillation response characteristic curve 10, the large floating body does not follow the wave amplitude ha at a small wave cycle (rough wave), and the wave amplitude ha at a large wave cycle (wave having a large swell). The vertical movement of the floating body coincides, that is, the floating body shakes completely following the wave. In the example shown in the figure, for example, when the wave period Tw is about 20 seconds, Za / ha becomes 1.0, indicating that the floating body moves in the same way as the wave. (2) Measurement of the vertical acceleration and the like of the actual floating body floating on the sea surface (steps 3 and 4) In the actual floating body 1, the vertical acceleration of the floating body is measured by the vertical acceleration sensor 7a.
At this time, it is preferable to measure the angular velocity of the floating body by the angular velocity sensor 7b in order to remove the influence of the inclination of the floating body and extract the acceleration component in the vertical direction.
【００３３】これらの計測データは記録装置１１に記録
される（ステップ５）。These measurement data are recorded in the recording device 11 (Step 5).
【００３４】図７は上下加速度センサ７ａにより計測さ
れた実際の浮体の加速度データの一つを示す。FIG. 7 shows one of actual acceleration data of the floating body measured by the vertical acceleration sensor 7a.
【００３５】図７は、縦軸に上下加速度、横軸に計測時
間ｔをとって示してある。これより浮体の実際の上下方
向の変位を積分・解析手段１２により２回積分して求め
る（ステップ６）。図８はその結果である。FIG. 7 shows the vertical acceleration on the vertical axis and the measurement time t on the horizontal axis. From this, the actual vertical displacement of the floating body is obtained by integrating twice by the integrating / analyzing means 12 (step 6). FIG. 8 shows the result.
【００３６】浮体の上下方向の加速度が−Ｚａ・ω2ｓ
ｉｎωｔで表されるとき、変位曲線はＺａ・ｓｉｎωｔ
で表される。The acceleration of the floating body in the vertical direction is -Za · ω 2 s
When represented by inωt, the displacement curve is Za · sinωt
It is represented by
【００３７】図８より、例えば波周期Ｔｗ＝１０秒、運
動振幅Ｚａ＝０．８が求まれば、これから、予めシュミ
ュレーション等により求めて解析装置８に入力しておい
た上記動揺応答特性曲線１０を用いて、図９示すように
Ｔｗ＝１０秒における無次元波振幅Ｚａ／ｈａ＝０．９
が求められる。From FIG. 8, for example, when the wave cycle Tw = 10 seconds and the motion amplitude Za = 0.8 are obtained, the above-mentioned fluctuation response characteristic curve which has been obtained in advance by simulation or the like and input to the analyzer 8 is obtained. 10, the dimensionless wave amplitude Za / ha = 0.9 at Tw = 10 seconds as shown in FIG.
Is required.
【００３８】そうすると、求めるべき波振幅ｈａ＝０．
９／Ｚａ＝０．９／０．８＝１．１（ｍ）と求められる
（ステップ７）。かかる計算は波高等計算手段１３によ
り行われる。Then, the wave amplitude ha = 0.
9 / Za = 0.9 / 0.8 = 1.1 (m) is obtained (step 7). Such calculation is performed by the wave height calculating means 13.
【００３９】このようにして算出された波浪情報である
波高や波周期等の波浪情報は浮体に設置されているメモ
リ・伝送手段１４たるコンピュータに記憶されると同時
に陸上監視装置へ伝送されるようになっている（ステッ
プ８）。Ｂ． 不規則波中の波浪情報の推定図１０は機
能ブロック図、図１１はそのフローチャート、図１２〜
２０はその説明図である。The wave information, such as wave height and wave period, which is calculated as described above, is stored in a computer serving as a memory / transmission means 14 installed on a floating body and is simultaneously transmitted to a land monitoring device. (Step 8). B. FIG. 10 is a functional block diagram, FIG. 11 is a flowchart thereof, and FIGS.
20 is an explanatory diagram thereof.
【００４０】上記波浪情報計測法は、浮体が正弦規則波
中に浮遊している場合のものであるが、実際の海面は、
このような規則波は少なく、殆どが不規則波である。The above wave information measuring method is for a case where the floating body is floating in a sine wave, but the actual sea surface is
There are few such regular waves, and most are irregular waves.
【００４１】そこで、不規則波に対応する波浪情報計測
の一般的手法が重要となるが、それを以下に説明する。Therefore, a general method of measuring the wave information corresponding to the irregular wave is important, which will be described below.
【００４２】まず、後述するように波向情報をも得る目
的で、予め浮体の６軸方向の運動のうち少なくとも３つ
の動揺応答特性曲線を上述したと同じ手法（シュミュレ
ーションや水槽実験）で求め（ステップ１，２）、これ
を解析装置１５に入力しておく。First, in order to obtain wave direction information as will be described later, at least three sway response characteristic curves among the movements of the floating body in six axial directions are obtained in advance by the same method (simulation or water tank experiment) as described above. (Steps 1 and 2), which are input to the analyzer 15.
【００４３】他方、後述するように波向情報をも得る目
的で、３軸方向加速度センサ１６ａや角速度センサ１６
ｂなどを実際の浮体に搭載しておき、その浮体を、波浪
情報を得たい海域に図１の如く係留して浮遊させる。そ
して、これらセンサによって実際の浮体の、少なくとも
３つの運動加速度ないし角速度を計測する（ステップ
３）。On the other hand, as will be described later, in order to obtain wave direction information, a three-axis direction acceleration sensor 16a and an angular velocity sensor 16a are used.
b is mounted on an actual floating body, and the floating body is moored and floated in a sea area where wave information is to be obtained as shown in FIG. Then, at least three motion accelerations or angular velocities of the actual floating body are measured by these sensors (step 3).
【００４４】つまり、この場合、図２に示すようにヒー
ブ（上下揺れ）、スウェイ（左右揺れ）サージ（前後揺
れ）の３軸方向の運動に加え、この各軸回りの運動であ
るヨウ、ロール（横揺れ）、ピッチ（縦揺れ）の６つ運
動のうち少なくとも３つの加速度又は角速度を計測す
る。この場合、ヒーブ（上下揺れ）、スウェイ（左右揺
れ）およびサージ（前後揺れ）は３軸方向加速度センサ
１７ａにより、また、ヨウ（船首揺れ）、ロール（横揺
れ）およびピッチ（縦揺れ）を計測する場合はいずれも
角速度センサ１７ｂにより計測する（ステップ３）。That is, in this case, as shown in FIG. 2, in addition to the three axial directions of heave (vertical sway), sway (lateral sway), and surge (forward / backward sway), the yaw and roll movements around these axes are included. The acceleration or angular velocity of at least three of the six movements (rolling) and pitch (pitch) are measured. In this case, the heave (vertical sway), sway (lateral sway) and surge (forward / backward sway) are measured by a three-axis acceleration sensor 17a, and yaw (bow), roll (roll) and pitch (pitch) are measured. If so, the measurement is performed by the angular velocity sensor 17b (step 3).
【００４５】なお、これら加速度データから必要に応じ
角速度データを用いて浮体の傾斜の影響を除去した例え
ば上下方向の加速度成分を抽出したものをデータ記録装
置１７たるコンピュータに記録しておく（ステップ４、
５）。但し、以下の説明は簡単なため上下方向加速度デ
ータについて主に述べるが、同様な操作や情報処理を、
計測した他の加速度や角速度（例えばロールφ、ピッチ
θ）に対しても行う。It should be noted that the acceleration data in the vertical direction, for example, from which the influence of the inclination of the floating body is removed from the acceleration data by using angular velocity data as necessary, is recorded in the computer as the data recording device 17 (step 4). ,
5). However, the following description mainly focuses on the vertical acceleration data for simplicity.
This is also performed for other measured accelerations and angular velocities (eg, roll φ, pitch θ).
【００４６】図１２は実際の浮体の上下方向の加速度を
計測した結果を計測時間ｔとの関係で示したものであ
る。計測した他の運動についての加速度や角速度データ
についても同様な結果を得る。FIG. 12 shows the result of measuring the actual vertical acceleration of the floating body in relation to the measurement time t. Similar results are obtained for acceleration and angular velocity data for other measured movements.
【００４７】そして、この上下方向加速度等についての
計測データに関して積分・解析手段１８によってこれを
２回積分して上下等の運動変位データ（３つの運動方向
の変位）を求める。図１３は求められた例えば上下方向
の運動変位を横軸に計測時間ｔをもって示した変位の時
系列である。The integration / analysis means 18 integrates the measured data on the vertical acceleration and the like twice to obtain vertical and vertical motion displacement data (displacements in three motion directions). FIG. 13 is a time series of the displacement, for example, showing the obtained vertical motion displacement with the measurement time t on the horizontal axis.
【００４８】次に、周波数分析手段１９によってこれを
周波数分析をする（ステップ６）。この分析によって、
図１３の変位の時系列は図１４に示すＺｃ１（ｔ）〜Ｚ
ｃｉ（ｔ）…（無限）の規則波の組み合わされたもので
あることを求める。これをフーリエ級数として表現すれ
ば、下記数式２のように表される。Next, the frequency is analyzed by the frequency analyzing means 19 (step 6). With this analysis,
The time series of the displacement in FIG. 13 is Zc1 (t) to Zc shown in FIG.
Ci (t)... (infinity) are required to be a combination of regular waves. If this is expressed as a Fourier series, it is expressed as the following Expression 2.
【００４９】[0049]
【数２】 (Equation 2)
【００５０】今、例えば図１４の変位の時系列(c)につ
いて、上述した手法（図８，９参照）と同様な手法によ
り、予め求められて解析装置１５に入力されている浮体
の動揺応答（振幅）特性曲線１０を用いて、例えば図１
５のように、変位Ｚａｉ、波周期Ｔｗｉのときのγｉを
求める。γｉ＝Ｚａｉ／ｈａ、即ち、ｈａ＝Ｚａｉ／γ
ｉを求める。位相遅れεzi についても同様にして、図
６(b)の応答位相特性曲線１０ａより を求める。Now, for example, the time series (c) of the displacement shown in FIG. 14 is calculated in advance by the same method as the above-mentioned method (see FIGS. Using the (amplitude) characteristic curve 10, for example, FIG.
As in 5, γi at the time of the displacement Zai and the wave period Twi is obtained. γi = Zai / ha, that is, ha = Zai / γ
Find i. Similarly, the phase delay ε zi is obtained from the response phase characteristic curve 10a in FIG. 6B.
【００５１】これらを上記数式２に代入すると、下記数
式３のように波振幅ｈｃ（ｔ）がフーリエ級数として表
される。By substituting these into the above equation (2), the wave amplitude hc (t) is expressed as a Fourier series as in the following equation (3).
【００５２】[0052]
【数３】 (Equation 3)
【００５３】図１６は上記フーリエ級数として表された
波振幅ｈｃ（ｔ）から展開して求めた波高ｈｃ（ｔ）の
時系列である。FIG. 16 is a time series of the wave height hc (t) obtained by expanding the wave amplitude hc (t) expressed as the Fourier series.
【００５４】これを基に、有義波高、最大波高、平均波
周期などの波浪情報が得られる（ステップ７）。以上は
動揺応答特性曲線を利用して波浪情報推定手段２０によ
って実行される。Based on this, wave information such as a significant wave height, a maximum wave height, and an average wave period is obtained (step 7). The above is executed by the wave information estimating means 20 using the fluctuation response characteristic curve.
【００５５】そして、これをフーリエ変換することによ
り図１７のような一次元波スペクトルが得られる。ここ
に、ω＝２π／Ｔｗである。Then, a one-dimensional wave spectrum as shown in FIG. 17 is obtained by Fourier transforming this. Here, ω = 2π / Tw.
【００５６】ところで、上記の一次元波スペクトルで
は、波の向き（波向分布）の情報は含まれていない。The one-dimensional wave spectrum does not include information on the direction of the wave (wave direction distribution).
【００５７】そこで、上下方向の運動の場合と同様にし
て、例えば、ロールφ（ｔ）、ピッチθ（ｔ）について
も上記と同じ手法で求めておく。そして、少なくとも３
つの運動を計測することにより、公知の二次元波スペク
トルを求める手段２１によって、図１８のような二次元
波スペクトルを得る（ステップ８）。Therefore, similarly to the case of the vertical movement, for example, the roll φ (t) and the pitch θ (t) are obtained in the same manner as described above. And at least 3
By measuring the two movements, a known two-dimensional wave spectrum obtaining means 21 obtains a two-dimensional wave spectrum as shown in FIG. 18 (step 8).
【００５８】この二次元波スペクトルをχ面に積分投影
したものが図１９である。これより波の主方向は、スペ
クトルの高さ、即ち、エネルギ密度が最も高い（ピー
ク）となる位置が９０°であることから、平面的に画い
た図２０に示すように風と同方向に波の向きが約９０度
と推定しうる（ステップ９）。また、二次元波スペクト
ルのエネルギ密度で波の強さも推定できる。FIG. 19 shows the integral projection of the two-dimensional wave spectrum on the χ plane. Since the main direction of the wave is 90 ° at the height of the spectrum, that is, the position where the energy density is highest (peak), the main direction of the wave is in the same direction as the wind as shown in FIG. The direction of the wave can be estimated to be about 90 degrees (step 9). In addition, the strength of the wave can be estimated from the energy density of the two-dimensional wave spectrum.
【００５９】一般に波向きは海面上の風の向きに一致し
ていることが経験則上知られていることから、実際の浮
体に風速・風向計を備えておけば、波向データないし波
向分布の精度の検証が可能となり、これによって波浪情
報の信頼性を確保できる。It is generally known from empirical rules that the direction of the wave coincides with the direction of the wind on the sea surface. Therefore, if an actual floating body is provided with a wind speed / wind indicator, the wave direction data or the wave direction is obtained. It is possible to verify the accuracy of the distribution, thereby ensuring the reliability of the wave information.
【００６０】以上のようにして求めた波浪情報は、メモ
リ・伝送手段２２にメモリされ、陸上監視設備に伝速さ
れる（ステップ１０）。The wave information obtained as described above is stored in the memory / transmission means 22 and transmitted to the on-land monitoring facility (step 10).
【００６１】[0061]
【発明の効果】この出願発明は、以上説明したような形
態で実施され、次のような効果を奏する。 （１） 本願のような上下動揺特性が波面の上下動と一
致しない大型の浮体を使用しての波浪情報計測方法によ
れば、 ａ）浅い海域から大深度海域まで海の深度に全く制約を
受けず、特に従来設置が難しかった大水深海域にも設置
可能であることから、このような海域での波浪情報を精
度良く得ることができる。The present invention is embodied in the form described above and has the following effects. (1) According to the method of measuring wave information using a large floating body whose vertical sway characteristic does not coincide with the vertical movement of the wavefront as in the present application, a) There is no restriction on the depth of the sea from a shallow sea area to a deep sea area. Since it can be installed especially in deep waters where it has been difficult to install it in the past, wave information in such seas can be obtained with high accuracy.
【００６２】ｂ）外洋のすべての海象・気象が計測可能
となるから、広域海域における海象計測のための本格的
な海象観測ブイの設置への道を開くものである。B) Since all sea conditions and weather in the open ocean can be measured, the road to full-scale sea condition observation buoys for sea condition measurement in a wide sea area is opened.
【００６３】ｃ）従来の計測方法では精度が十分でなか
った暴風時の波浪情報を全周波数帯域かつ高精度で計測
できる。 （２） 本願装置によれば、実用上差し支えない精度を
もった（誤差１０％程度）波浪データ（最大波高、有義
波高、波周期）を得ることができる。 （３）本願装置は設置場所に制約がなく、ブイを新設し
なくても、既存の係留浮体（航路標識ブイ、浮き魚礁
等）にも搭載可能である。C) Wave information at the time of a storm, which was not sufficiently accurate with the conventional measurement method, can be measured with high accuracy over the entire frequency band. (2) According to the apparatus of the present invention, wave data (maximum wave height, significant wave height, wave period) having accuracy that is practically acceptable (error of about 10%) can be obtained. (3) The device of the present invention is not limited in its installation location, and can be mounted on an existing mooring body (such as a buoy for marking a route or a floating reef) without newly installing a buoy.
【００６４】既存の海洋構造物を利用した波浪観測や、
市販の波浪観測ブイでは設置困難な深海域においても波
浪観測ができる汎用型波浪情報計測装置を提供できる。Wave observation using existing offshore structures,
It is possible to provide a general-purpose wave information measurement device capable of observing waves even in a deep sea area where it is difficult to install a commercially available wave observation buoy.
【図１】本願発明が適用される大型浮体の概略正面図で
ある。FIG. 1 is a schematic front view of a large floating body to which the present invention is applied.
【図２】浮体の６つの運動を示す図である。FIG. 2 is a diagram showing six movements of a floating body.
【図３】規則波に対する波浪情報計測装置の機能ブロッ
ク図である。FIG. 3 is a functional block diagram of a wave information measuring device for a regular wave.
【図４】同フローチャートである。FIG. 4 is the same flowchart.
【図５】規則波中の浮体の動揺応答特性を求めるための
シュミュレーション図である。FIG. 5 is a simulation diagram for obtaining a fluctuation response characteristic of a floating body in a regular wave.
【図６】(a)は同シュミュレーションにより求められた
動揺応答（振幅）特性曲線図である。(b)は動揺応答
（位相遅れ）特性曲線図である。FIG. 6 (a) is a diagram of a fluctuation response (amplitude) characteristic curve obtained by the simulation. (b) is a characteristic curve diagram of the oscillation response (phase lag).
【図７】実際の大型浮体において計測された上下加速度
（縦軸）を、横軸に計測時間をとって表した図である。FIG. 7 is a diagram showing vertical acceleration (vertical axis) measured on an actual large floating body, with the horizontal axis indicating measurement time.
【図８】２回積分で求められた上下変位（縦軸）を、横
軸に計測時間をとって表した図である。FIG. 8 is a diagram showing vertical displacement (vertical axis) obtained by two-time integration with measurement time taken on a horizontal axis.
【図９】シュミュレーションにより求めた動揺応答特性
曲線を利用して上下変位と波高の比を求める要領図であ
る。FIG. 9 is a view showing a procedure for obtaining a ratio between a vertical displacement and a wave height using a fluctuation response characteristic curve obtained by simulation.
【図１０】不規則波に対する波浪情報計測装置の機能ブ
ロック図である。FIG. 10 is a functional block diagram of the wave information measuring device for irregular waves.
【図１１】同フローチャートである。FIG. 11 is the same flowchart.
【図１２】実際の大型浮体において計測された加速度の
時系列である。FIG. 12 is a time series of acceleration measured on an actual large floating body.
【図１３】２回積分により求められた変位の時系列であ
る。FIG. 13 is a time series of displacement obtained by two-time integration.
【図１４】(a)(b)(c)は図１３の時系列を周波数分析し
たときの各時系列である。14 (a), (b) and (c) are time series when the time series of FIG. 13 is subjected to frequency analysis.
【図１５】各時系列に基づき波高に対する変位の比を、
動揺応答特性曲線から求める要領図である。FIG. 15 shows the ratio of displacement to wave height based on each time series,
FIG. 9 is a diagram showing a procedure to be determined from a motion response characteristic curve.
【図１６】上記で求めた波高の時系列である。FIG. 16 is a time series of the wave height obtained above.
【図１７】フーリエ変換により求められた一次元波スペ
クトルの図である。FIG. 17 is a diagram of a one-dimensional wave spectrum obtained by Fourier transform.
【図１８】二次元波スペクトルの図である。FIG. 18 is a diagram of a two-dimensional wave spectrum.
【図１９】波向を求めるための波向分布である。FIG. 19 is a wave direction distribution for obtaining a wave direction.
【図２０】波浪の主方向と風向との関係図である。FIG. 20 is a diagram illustrating a relationship between a main direction of a wave and a wind direction.
１…大型浮体 ２…係留ライン ３…櫓状構造物 ４…風速・風向センサ ５…ＧＰＳアンテナ ６…データ保存・処理・通信用ユニット ７…動揺センサユニット（７ａ…加速度センサ、７ｂ…
角速度センサ） ８…解析装置 ９…積分・解析手段 １０…動揺応答（振幅）特性曲線 １０ａ…応答位相特性曲線 １１…データ記録装置 １２…積分・解析手段 １３…波高等計算手段 １４…メモリ・伝送手段 １５…解析装置 １６…３軸方向センサ・角速度センサ １８…積分・解析手段 １９…周波数分析手段 ２０…波浪情報推定手段 ２１…二次元スペクトルを求める手段 ２２…メモリ・伝送手段DESCRIPTION OF SYMBOLS 1 ... Large floating body 2 ... Mooring line 3 ... Tower-shaped structure 4 ... Wind speed / wind direction sensor 5 ... GPS antenna 6 ... Data storage / processing / communication unit 7 ... Motion sensor unit (7a ... acceleration sensor, 7b ...
8: Analysis device 9: Integration / analysis means 10: Oscillation response (amplitude) characteristic curve 10a: Response phase characteristic curve 11: Data recording device 12: Integration / analysis means 13: Crest height calculation means 14: Memory / transmission Means 15 Analysis device 16 Three-axis direction sensor / angular velocity sensor 18 Integration / analysis means 19 Frequency analysis means 20 Wave information estimation means 21 Means for obtaining two-dimensional spectrum 22 Memory / transmission means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小寺山 亘 福岡県太宰府市青葉台３丁目20番８号 Ｆターム(参考） 2F069 AA04 BB40 DD19 DD20 DD25 GG06 GG20 GG39 GG41 GG56 GG72 JJ08 JJ19 JJ25 KK05 MM04 NN13 QQ05 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Wataru Kodera 3-20-8 Aobadai, Dazaifu City, Fukuoka Prefecture F-term (reference) 2F069 AA04 BB40 DD19 DD20 DD25 GG06 GG20 GG39 GG41 GG56 GG72 JJ08 JJ19 JJ25 KK05 MM04 NN13 QQ05
Claims (6)
ない大型の浮体を用いた波浪情報計測方法であって、 シュミレーションや水槽実験等により予め浮体の上下動
の応答特性を推定してその動揺応答特性曲線を求めてお
く一方、実際の浮体の上下方向加速度を計測し、この加
速度データに基づき浮体の実際の上下運動変位データを
積分演算して求め、この変位データと前記動揺応答特性
曲線とから波浪情報を求めるようにしたことを特徴とす
る大型浮体による波浪情報計測方法。1. A wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of a wavefront, wherein the response characteristic of the vertical motion of the floating body is estimated in advance by simulation, a water tank experiment, or the like. While the motion response characteristic curve is obtained, the actual vertical acceleration of the floating body is measured, and based on the acceleration data, the actual vertical motion displacement data of the floating body is calculated by integration, and the displacement data and the motion response characteristic curve are obtained. A wave information measuring method using a large floating body, wherein wave information is obtained from the following.
ない大型の浮体を用いた波浪情報計測方法であって、 シュミレーションや水槽実験等により予め浮体の上下動
の応答特性を推定してその動揺応答特性曲線を求めてお
く一方、実際の浮体の上下方向加速度を計測し、この加
速度データに基づき浮体の実際の上下運動変位データを
積分演算して求め、この変位データを周波数分析し、こ
の周波数分析の結果と前記動揺応答特性曲線とにより波
浪情報を求めるようにしたことを特徴とする大型浮体に
よる波浪情報計測方法。2. A wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of a wavefront, wherein the response characteristic of the vertical motion of the floating body is estimated in advance by simulation, a water tank experiment, or the like. While obtaining the motion response characteristic curve, the vertical acceleration of the actual floating body is measured, the actual vertical movement displacement data of the floating body is calculated by integration based on the acceleration data, and the displacement data is subjected to frequency analysis. A wave information measuring method using a large floating body, wherein wave information is obtained based on a result of frequency analysis and the fluctuation response characteristic curve.
ない大型の浮体を用いた波浪情報計測方法であって、 シュミレーションや水槽実験等により予め浮体の上下動
（ヒーブ）、左右揺れ（スエイ）、前後揺れ（サー
ジ）、横揺れ（ロール）、縦揺れ（ピッチ）および船首
揺れ（ヨウ）運動のうち少なくとも３つの動揺の応答特
性を推定してその動揺応答特性曲線を求めておく一方、
実際の浮体の動揺加速度および動揺角速度を計測し、こ
れらの加速度データおよび角速度データに基づき浮体の
少なくとも当該３方向の運動変位データを積分演算して
求め、この運動変位データを周波数分析し、この周波数
分析の結果と前記動揺応答特性曲線とから波浪情報を求
めるようにしたことを特徴とする大型浮体による波浪情
報計測方法。3. A wave information measuring method using a large floating body whose vertical oscillating response characteristic does not coincide with the vertical movement of a wavefront, wherein the floating body is previously moved up and down (heave) and sway (sway) by simulation or a water tank experiment. ), The response characteristics of at least three of the back and forth sway (surge), the roll (roll), the pitch (pitch), and the bow (yaw) motion are estimated, and the sway response characteristic curve is obtained.
The actual oscillating acceleration and oscillating angular velocity of the floating body are measured, and based on these acceleration data and angular velocity data, motion displacement data of at least the three directions of the floating body are calculated by integration, and the motion displacement data is frequency-analyzed. A wave information measuring method using a large floating body, wherein wave information is obtained from an analysis result and the motion response characteristic curve.
致しない大型の浮体を用いた波浪情報の計測装置であっ
て、 実際の浮体に設けた上下加速度センサと、この加速度セ
ンサより計測した加速度データに基づき実際の浮体の上
下運動変位データを演算・解析する演算解析手段と、シ
ュミレーションや水槽実験等により予め求めておいた浮
体の上下動揺応答特性曲線を用いて前記演算解析手段に
より求めた浮体の実際の上下動変位データから波浪情報
を計算する計算手段とを備えてなる大型浮体による波浪
情報計測装置。4. A wave information measuring apparatus using a large floating body whose vertical oscillating characteristic does not coincide with the vertical movement of a wavefront, wherein a vertical acceleration sensor provided on an actual floating body and measurement using the acceleration sensor are performed. Calculation and analysis means for calculating and analyzing the actual vertical movement displacement data of the floating body based on the acceleration data, and the calculation and analysis means obtained by using the vertical movement response characteristic curve of the floating body which has been obtained in advance by a simulation or a water tank experiment. A wave information measuring apparatus using a large floating body, comprising: a calculating means for calculating wave information from actual vertical movement displacement data of the floating body.
致しない大型の浮体を用いた波浪情報の計測装置であっ
て、 実際の浮体に設けた上下加速度センサと、この加速度セ
ンサより計測した加速度データに基づき実際の浮体の上
下運動変位データを演算・解析する演算解析手段と、こ
の演算解析手段により得られた上下運動変位データに基
づき周波数分析を行う周波数分析手段と、前記シュミレ
ーションや水槽実験等により予め求めておいた浮体の上
下動揺応答特性曲線を用いて、前記周波数分析手段の結
果から波浪情報を推定する波浪情報推定手段とを備えて
なる大型浮体による波浪情報計測装置。5. A wave information measuring device using a large floating body whose vertical swing characteristics do not coincide with the vertical movement of a wavefront, wherein a vertical acceleration sensor provided on an actual floating body and a measurement using the acceleration sensor are performed. A calculation and analysis means for calculating and analyzing actual vertical movement displacement data of the floating body based on the acceleration data; a frequency analysis means for performing frequency analysis based on the vertical movement displacement data obtained by the calculation and analysis means; A wave information measuring device for a large floating body, comprising: wave information estimating means for estimating wave information from the result of the frequency analysis means, using a vertical motion response characteristic curve of the floating body obtained in advance by the above method.
致しない大型の浮体を用いた波浪情報の計測装置であっ
て、 上下動、左右揺れ、前後揺れ、横揺れ、縦揺れおよび船
首揺れ運動のうち少なくとも３つの実際の浮体の動揺を
測るべく該浮体に設けた上下加速度センサや角速度セン
サ等の動揺センサと、この動揺センサより計測した加速
度データや角速度データに基づき実際の浮体の少なくと
も３つの当該運動変位データを演算・解析する演算解析
手段と、この演算解析手段により得られた運動変位デー
タに基づき周波数分析を行う周波数分析手段と、前記シ
ュミレーションや水槽実験等により予め求めておいた浮
体の上下動揺応答特性曲線を用いて、前記周波数分析手
段の結果から波浪情報を推定する波浪情報推定手段とを
備えてなる大型浮体による波浪情報計測装置。6. A wave information measuring apparatus using a large floating body whose vertical swing characteristics do not coincide with the vertical movement of a wavefront, comprising: a vertical movement, a horizontal sway, a back and forth sway, a horizontal sway, a vertical sway and a bow sway. A motion sensor, such as a vertical acceleration sensor or an angular velocity sensor, provided on the floating body to measure the motion of at least three actual floating bodies of the motion, and at least three of the actual floating bodies based on acceleration data and angular velocity data measured by the motion sensors. Calculation analysis means for calculating and analyzing the motion displacement data, frequency analysis means for performing frequency analysis based on the motion displacement data obtained by the calculation analysis means, and a floating body determined in advance by the simulation, a water tank experiment, or the like. And wave information estimating means for estimating wave information from the result of the frequency analysis means using the vertical motion response characteristic curve of Wave information measurement device according to the floating body.
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