JP2004280543A - Structure analysis condition setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set various kinds of conditions required for a structure analysis. <P>SOLUTION: Element sizes, load conditions or constraints ("analysis conditions", hereafter) are related to respective colors and they are displayed on a monitor as a color palette. Then, by using a pointing device such as a mouse or a light pen, the color corresponding to a desired analysis condition is selected from the color palette and a model is painted with the color. Thereafter, to an area painted with the color, the analysis condition relating to the color is set. Also, instead of painting the model with the color, it is possible to plot a two-dimensional graphic and a line segment to be the reference of the analysis condition to the prescribed area of the model sectioned by color-coding or lines and set the analysis condition proportional to them. Further, it is possible to plot a reference value and a curved line to the prescribed area of the model sectioned by the color-coding or the lines and set the analysis condition corresponding to function distribution obtained from the interval of both. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

要素サイズ定義テーブルには、各色に関連付けられた要素サイズを定義すべく、表２に示すように、色番号により一意に特定される各色について、三次元モデルを分割する要素サイズが登録される。なお、各色に対応する要素サイズは、任意に変更，追加及び削除可能な構成とすることが望ましい。
【００１９】
【表２】

荷重値定義テーブルには、各色に関連付けられた荷重値を定義すべく、表３に示すように、色番号により一意に特定される各色について、三次元モデルに作用させる荷重（集中荷重又は等分布荷重）の荷重値が登録される。荷重値としては、集中荷重のときには１点に作用する力の大きさ、等分布荷重のときには単位面積当たりに作用する力の大きさが用いられる。なお、各色に対応する荷重値は、任意に変更，追加及び削除可能な構成とすることが望ましい。
【００２０】
【表３】

変位量定義テーブルには、各色に関連付けられた変位量を定義すべく、表４に示すように、色番号により一意に特定される各色について、三次元モデルを強制変位させるときの変位量が登録される。なお、各色に対応する変位量は、任意に変更，追加及び削除可能な構成とすることが望ましい。
【００２１】
【表４】

拘束条件定義テーブルには、各色に関連付けられた拘束条件を定義すべく、表５に示すように、色番号により一意に特定される各色について、三次元モデルの拘束条件が登録される。拘束条件としては、三次元モデルにおける６自由度、即ち、ｘ軸方向，ｙ軸方向，ｚ軸方向，ｘ軸周り，ｙ軸周り及びｚ軸周りの変位量を示す「自由度１」〜「自由度６」が用いられる。ここで、自由度が０であるときには、その軸方向又は軸周りに三次元モデルが変位しないことを示している。また、同表中の「−」は、自由度が設定されていないことを示している。なお、各色に対応する拘束条件は、任意に変更，追加及び削除可能な構成とすることが望ましい。
【００２２】
【表５】

形状定義設定テーブルには、三次元ＣＡＤ（Ｃｏｍｐｕｔｅｒ Ａｉｄｅｄ Ｄｅｓｉｇｎ）などにより三次元モデルが作成又は更新されたときに、表６に示すように、三次元モデルを構成するポイント，カーブ，サーフェス及びソリッドなどの各種形状について、形状番号，形状タイプ及びその構成要素が登録される。また、形状定義設定テーブルには、構造解析条件設定処理の結果として、形状定義更新機能３０Ａにより新たな領域が分割されたときに、その領域を定義する形状番号，形状タイプ及びその構成要素が追加登録される。
【００２３】
【表６】

要素サイズ設定テーブルには、構造解析条件設定処理の結果として、表７に示すように、形状番号により一意に特定される各種形状（特に領域）について、これを分割する要素サイズが登録される。ここで、要素サイズが「関数１」となっている領域（Ｆ１．３）については、分割する要素サイズが関数により定義されており、その関数の実体に対してリンクで関連付けられていることを示している（以下同様）。
【００２４】
【表７】

荷重条件設定テーブルには、構造解析条件設定処理の結果として、形状番号により一意に特定される各種形状に荷重条件を関連付けるべく、表８に示すように、荷重番号，荷重種類（集中荷重又は分布荷重），荷重値，ベクトル（単位ベクトル又は法線ベクトル）及び形状番号が登録される。
【００２５】
【表８】

拘束条件設定テーブルには、構造解析条件設定処理の結果として、形状番号により一意に特定される各種形状に拘束条件を関連付けるべく、表９に示すように、拘束番号，自由度１〜自由度６及び形状番号が登録される。
【００２６】
【表９】

ここで、構造解析条件設定装置の基本処理として、要素サイズ，荷重条件及び拘束条件の設定に用いる色の選択方法について説明する。第１の方法としては、カラーパレットをモニタ２０に表示し、その中から所望する色を１つ選択させる。第２の方法としては、ポインティングデバイス１０を動かす速さと色とを関連付けて登録しておき、色塗り又はライン描画したときの操作速度に対応した色を選択する。このとき、操作速度として最速及び最遅のみが登録されているときには、その中間速度についてはこれらを補間した色を選択すればよい。第３の方法としては、例えば、カラーパレットの色を降順又は昇順に順次選択するように、色塗り又はライン描画を行うたびに、所定規則により色を自動的に選択する。このとき、カラーパレットの色を降順又は昇順に順次選択するかは、自由に指定できるようにすることが望ましい。
【００２７】
また、構造解析条件設定装置では、２つの方法により処理対象となる三次元モデルの領域が区画される。即ち、図２（Ａ）に示すように、ポインティングデバイス１０を用いて三次元モデルの表面を色で塗り分けると、各色によって夫々区画される領域が処理対象とされる。このとき、図示するような色の塗り分けでは、複数の色が重畳される箇所が存在するが、最前面に塗られた色を優先するようにすればよい。一方、同図（Ｂ）に示すように、ポインティングデバイス１０を用いて三次元モデルに重畳するようにラインを描画すると、そのラインを三次元モデルの表面に射影して反映させる。具体的には、描画されたラインは、モニタ２０に対して垂直なベクトル（ａ，ｂ，ｃ）を法線ベクトルとする平面ａｘ＋ｂｙ＋ｃｚ＝ｄ上の線分と認識されるので、公知の演算処理によりこれを三次元モデルの表面に射影させる。
【００２８】
次に、かかる基本処理を活用し、三次元モデルに対して各種構造解析条件を設定する処理概要について説明する。
（１）要素サイズの設定方法
（ａ）第１の方法（第１の要素サイズ設定方法）
カラーパレット定義テーブル及び要素サイズ定義テーブルを参照し、各色と要素サイズとを関連付けた後、図３（Ｂ）に示すように、モニタ２０にカラーパレットを表示させる。そして、ポインティングデバイス１０を用いて、カラーパレットの中から所望する要素サイズに対応した色を選択し、同図（Ａ）に示すように、三次元モデルの所定領域に対して色塗りを行う。その後、色塗りを行った所定領域について、その色により特定される要素サイズを設定する。このとき、領域及び要素サイズの指定が同時に行われることから、操作を簡略化することができる。
【００２９】
（ｂ）第２の方法（第２の要素サイズ設定方法）
ポインティングデバイス１０を用いて、図４に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、要素サイズの目安となる二次元図形（円又は四角など）を描画する。そして、二次元図形を描画した所定領域について、二次元図形の大きさに比例した要素サイズを設定する。なお、要素サイズとしては、二次元図形の大きさをそのまま用いてもよいし、単位面積当たりの要素サイズを基準値として予め登録しておき、これと二次元図形との比較により決定するようにしてもよい。
【００３０】
（ｃ）第３の方法（第３の要素サイズ設定方法）
ポインティングデバイス１０を用いて、図５に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、要素サイズの目安となる線分を描画する。そして、線分を描画した所定領域について、線分の長さに比例した要素サイズを設定する。なお、要素サイズとしては、線分の長さをそのまま用いてもよいし、単位長さ当たりの要素サイズを基準値として予め登録しておき、これと線分との比較により決定するようにしてもよい。
【００３１】
（ｄ）第４の方法（第４の要素サイズ設定方法）
ポインティングデバイス１０を用いて、図６に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、基準線及び曲線を夫々描画する。そして、基準線と曲線との距離から要素サイズを決定する関数分布を作成する。このとき、基準線の始点について、要素サイズを基準値として予め登録しておき、他の部分についてはこれとの比較によりその大きさを決定することが望ましい。その後、基準線が延びる方向に所定幅で三次元モデルを複数領域に分割し、各領域について関数分布により定義される値を要素サイズとして設定する。このようにすれば、三次元モデルの所定領域に対して、複雑な要素サイズを容易に設定できるようになる。なお、図示の例では、三次元モデルの一面全体が１つの所定領域に設定されている（以下同様）。
（２）荷重条件の設定方法
（ａ）第１の方法（第１の荷重条件設定方法）
カラーパレット定義テーブル及び荷重値定義テーブルを参照し、各色と荷重値とを関連付けた後、図７（Ｂ）に示すように、モニタ２０にカラーパレットを表示させる。そして、ポインティングデバイス１０を用いて、カラーパレットの中から所望する荷重値に対応した色を選択し、同図（Ａ）に示すように、三次元モデルの所定領域に対して色塗りを行う。その後、色塗りを行った所定領域について、その色により特定される荷重値の等分布荷重を設定する。
【００３２】
また、カラーパレットの中から所望する荷重値に対応した色を選択した後、ポインティングデバイス１０を用いて、同図（Ｃ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、荷重方向を示すラインを描画する。そして、三次元モデルの所定領域について、ラインが示す荷重方向に、その描画色により特定される荷重値の集中荷重を設定する。
【００３３】
（ｂ）第２の方法（第２の荷重条件設定方法）
ポインティングデバイス１０を用いて、図８（Ａ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、荷重値の目安となる二次元図形を描画する。そして、二次元図形を描画した所定領域について、二次元図形の大きさに比例した荷重値の等分布荷重を設定する。なお、荷重値としては、単位面積当たりの荷重値を基準値として予め登録しておき、これと二次元図形との比較により決定するようにすればよい（以下同様）。
【００３４】
また、ポインティングデバイス１０を用いて、同図（Ｂ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、荷重方向を示すラインを描画する。そして、ラインに重畳するように、荷重値の目安となる二次元図形を描画する。その後、二次元図形を描画した所定領域について、ラインが示す荷重方向に、二次元図形の大きさに比例した荷重値の集中荷重を設定する。
【００３５】
（ｃ）第３の方法（第３の荷重条件設定方法）
ポインティングデバイス１０を用いて、図９（Ａ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、荷重値の目安となる線分を描画する。そして、線分を描画した所定領域について、その長さに比例した荷重値の等分布荷重を設定する。
【００３６】
また、ポインティングデバイス１０を用いて、同図（Ｂ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、荷重方向を示すラインを描画する。そして、三次元モデルの所定領域について、ラインが示す荷重方向に、ラインの長さに比例した荷重値の集中荷重を設定する。
【００３７】
（ｄ）第４の方法（第４の荷重条件設定方法）
ポインティングデバイス１０を用いて、図１０に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に重畳するように、基準線及び曲線を夫々描画する。そして、基準線と曲線との距離から荷重値を決定する関数分布を作成する。このとき、基準線の始点について、荷重値を基準値として予め登録しておき、他の部分についてはこれとの比較によりその大きさを決定することが望ましい。その後、基準線が延びる方向に所定幅で三次元モデルを複数領域に分割し、各領域について関数分布により定義される値を荷重値として設定する。このようにすれば、三次元モデルの所定領域に対して、複雑な荷重値を容易に設定できるようになる。
（３）拘束条件の設定方法
（ａ）第１の方法（第１の拘束条件設定方法）
カラーパレット定義テーブル及び拘束条件定義テーブルを参照し、各色と拘束条件とを関連付けた後、図１１（Ｂ）に示すように、モニタ２０にカラーパレットを表示させる。ここで、表中の「並進」とは、その自由度に関して変位が規制されていることを示している。そして、ポインティングデバイス１０を用いて、カラーパレットの中から所望する拘束条件に対応した色を選択し、同図（Ａ）に示すように、三次元モデルの所定領域に対して色塗りを行う。その後、色塗りを行った所定領域について、その色により特定される拘束条件を設定する。このとき、領域及び拘束条件の指定が同時に行われることから、操作を簡略化することができる。
【００３８】
（ｂ）第２の方法（第２の拘束条件設定方法）
ポインティングデバイス１０を用いて、図１２に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、変位方向を示すラインを描画する。そして、ラインに重畳するように、変位量の目安となる二次元図形を描画する。その後、三次元モデルの所定領域について、ラインが示す変位方向に、二次元図形の大きさに比例した変位量だけ強制変位させる拘束条件を設定する。
【００３９】
（ｃ）第３の方法（第３の拘束条件設定方法）
ポインティングデバイス１０を用いて、図１３に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、変位方向を示すラインを描画する。そして、三次元モデルの所定領域について、ラインが示す変位方向に、ラインの長さに比例した変位量だけ強制変位させる拘束条件を設定する。
【００４０】
（ｄ）第４の方法（第４の拘束条件設定方法）
カラーパレット定義テーブル及び変位量定義テーブルを参照し、各色と変位量とを関連付けた後、図１４（Ｂ）に示すように、モニタ２０にカラーパレットを表示させる。そして、ポインティングデバイス１０を用いて、カラーパレットの中から所望する変位量に対応した色を選択し、同図（Ａ）に示すように、色塗り又はラインにより区画された三次元モデルの所定領域に対して、変位方向を示すラインを描画する。その後、三次元モデルの所定領域について、ラインが示す変位方向に、その描画色により特定される変位量だけ強制変位させる拘束条件を設定する。
【００４１】
図１５は、形状定義更新機能３０Ａを実現する処理のフローチャートを示す。なお、かかる処理は、三次元モデルに対して領域を区画するための色塗り又はライン描画が行われたときに実行される。
【００４２】
ステップ１（図では「Ｓ１」と略記する。以下同様）では、三次元モデルに対してなされた色塗り情報又はライン情報を読み込む。ここで、「色塗り情報」及び「ライン情報」としては、少なくともその形状を特定可能な座標値を含むデータが該当する。
【００４３】
ステップ２では、色塗り又はラインにより区画される領域を分割する。即ち、図１６に示すように、三次元モデルの一面（Ｆ１）に色塗りを行ったときには、これを色塗りで区画される領域に分割する。
【００４４】
ステップ３では、分割された領域に対して新たな形状番号（Ｆ１．１及びＦ１．２）を付し、その形状定義を形状定義設定テーブルに追加登録して更新する。
ステップ４では、形状定義設定テーブルが正常に更新されたか否かを判定する。そして、形状定義設定テーブルが正常に更新されれば処理を終了し（Ｙｅｓ）、正常に更新されなければステップ１へと戻る（Ｎｏ）。
【００４５】
かかる処理によれば、三次元モデルに対して領域を区画すべく色塗り又はライン描画を行うと、色塗り又はラインにより区画される領域が分割され、その形状定義がデータベースに登録される。このため、簡易かつ直感的な操作で領域が区画され、その労力を大幅に軽減することができる。
【００４６】
図１７は、要素サイズ設定機能３０Ｂを実現する処理のフローチャートを示す。なお、かかる処理は、例えば、メニューから要素サイズの設定コマンドが選択されたときに実行される。
【００４７】
ステップ１１では、要素サイズ定義情報を読み込む。即ち、要素サイズを設定する第１の方法では、カラーパレット定義テーブル及び要素サイズ定義テーブルを参照し、各色に対して要素サイズを関連付ける。また、第２の方法又は第３の方法では、必要に応じて、単位面積又は単位長さ当たりの基準値を読み込む。
【００４８】
ステップ１２では、関数分布定義による要素サイズの設定か否か、即ち、第４の方法で要素サイズを設定するか否かを判定する。そして、関数分布定義による要素サイズの設定であればステップ１３へと進み（Ｙｅｓ）、三次元モデルの所定領域に描画された基準線及び曲線から分布定義関数を求める。一方、関数分布定義による要素サイズの設定でなければステップ１４へと進む（Ｎｏ）。
【００４９】
ステップ１４では、要素サイズの設定方法に応じた手段で要素サイズを決定する。なお、要素サイズを決定する手段の詳細については、前述した第１〜第４の方法を参照されたい。
【００５０】
ステップ１５では、要素サイズを形状定義に関連付けて、要素サイズ設定テーブルに追加登録する。
ステップ１６では、要素サイズが正常に登録されたか否かを判定する。そして、要素サイズが正常に登録されれば処理を終了し（Ｙｅｓ）、正常に登録されなかったならばステップ１１へと戻る（Ｎｏ）。
【００５１】
かかる要素サイズ設定処理によれば、三次元モデルに対して、ポインティングデバイス１０を用いて色塗り，ライン描画，二次元図形描画又は線分描画などを行うことで、その所定領域に要素サイズが設定される。このような操作は、視覚的かつ感覚的に行われることから、構造解析条件の１つとしての要素サイズを極めて容易に設定することができる。
【００５２】
図１８は、荷重条件設定機能３０Ｃを実現する処理のフローチャートを示す。なお、かかる処理は、例えば、メニューから荷重条件設定コマンドが選択されたときに実行される。
【００５３】
ステップ２１では、荷重条件定義情報を読み込む。即ち、荷重条件を設定する第１の方法では、カラーパレット定義テーブル及び荷重値定義テーブルを参照し、各色に対して荷重値を関連付ける。また、第２の方法又は第３の方法では、必要に応じて、単位面積又は単位長さ当たりの基準値を読み込む。
【００５４】
ステップ２２では、関数分布定義による荷重条件の設定か否か、即ち、第４の方法で荷重条件を設定するか否かを判定する。そして、関数分布定義による荷重条件の設定であればステップ２３へと進み（Ｙｅｓ）、三次元モデルの所定領域に描画された基準線及び曲線から分布定義関数を求める。一方、関数分布定義による荷重条件の設定でなければステップ２４へと進む（Ｎｏ）。
【００５５】
ステップ２４では、荷重方向がラインにより定義されているか否かを判定する。そして、荷重方向がラインにより定義されていればステップ２５へと進み（Ｙｅｓ）、その方向ベクトルを正規化して単位ベクトルを求める。一方、荷重条件がラインにより定義されていなければ、荷重方向は領域に垂直な法線ベクトルであるとみなしステップ２６へと進む（Ｎｏ）。
【００５６】
ステップ２６では、荷重条件の設定方法に応じた手段で荷重条件を決定する。なお、荷重条件を決定する手段の詳細については、前述した第１〜第４の方法を参照されたい。
【００５７】
ステップ２７では、荷重条件を荷重条件設定テーブルに追加登録する。
ステップ２８では、荷重条件が正常に登録されたか否かを判定する。そして、荷重条件が正常に登録されれば処理を終了し（Ｙｅｓ）、正常に登録されなかったならばステップ２１へと戻る（Ｎｏ）。
【００５８】
かかる荷重条件設定処理によれば、三次元モデルに対して、ポインティングデバイス１０を用いて色塗り，ライン描画，二次元図形描画又は線分描画などを行うことで、その所定領域に荷重条件が設定される。このような操作は、視覚的かつ感覚的に行われることから、構造解析条件の１つとしての荷重条件を極めて容易に設定することができる。
【００５９】
図１９は、拘束条件設定機能３０Ｄを実現する処理のフローチャートを示す。なお、かかる処理は、例えば、メニューから拘束条件設定コマンドが選択されたときに実行される。
【００６０】
ステップ３１では、拘束条件定義情報を読み込む。即ち、拘束条件を設定する第１の方法では、カラーパレット定義テーブル及び拘束条件定義テーブルを参照し、各色に対して荷重条件を関連付ける。また、第２の方法又は第３の方法では、単位面積又は単位長さ当たりの基準値を読み込む。さらに、第４の方法では、カラーパレット定義テーブル及び変位量定義テーブルを参照し、各色に対して変位量を関連付ける。
【００６１】
ステップ３２では、強制変位の自由度（方向）がラインにより定義されているか否かを判定する。そして、強制変位の自由度がラインにより定義されていればステップ３３へと進み（Ｙｅｓ）、ラインの方向ベクトルから各自由度の変位量を求める。一方、強制変位の自由度がラインにより定義されていなければステップ３４へと進む（Ｎｏ）。
【００６２】
ステップ３４では、拘束条件の設定方法に応じた手段で拘束条件を決定する。なお、拘束条件を決定する手段の詳細については、前述した第１〜第４の方法を参照されたい。
【００６３】
ステップ３５では、拘束条件を拘束条件設定テーブルに追加登録する。
ステップ３６では、拘束条件が正常に登録されたか否かを判定する。そして、拘束条件が正常に登録されれば処理を終了し（Ｙｅｓ）、正常に登録されなかったならばステップ３１へと戻る（Ｎｏ）。
【００６４】
かかる拘束条件設定処理によれば、三次元モデルに対して、ポインティングデバイス１０を用いて色塗り，ライン描画，二次元図形描画又は線分描画などを行うことで、その所定領域に拘束条件が設定される。このような操作は、視覚的かつ感覚的に行われることから、構造解析条件の１つとしての拘束条件を極めて容易に設定することができる。
【００６５】
なお、以上の説明では、三次元モデルに対する構造解析条件の設定方法を説明したが、同様な方法で二次元モデルに対しても構造解析条件を極めて容易に設定できることはいうまでもない。
【００６６】
（付記１）ポインティングデバイスを用いてモデルに色を塗り、色が塗られた領域にその色に関連付けられた要素サイズを設定する第１の要素サイズ設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように二次元図形を描画し、該所定領域に二次元図形の大きさに比例した要素サイズを設定する第２の要素サイズ設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように線分を描画し、該所定領域に線分の長さに比例した要素サイズを設定する第３の要素サイズ設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように基準線及び曲線を描画し、該基準線と曲線との距離から関数分布を求め、前記所定領域に関数分布により定義される値を要素サイズとして設定する第４の要素サイズ設定方法と、の少なくとも１つを備えたことを特徴とする構造解析条件設定方法。
【００６７】
（付記２）前記第２の要素サイズ設定方法は、単位面積当たりの要素サイズを基準値として予め登録しておき、これと二次元図形の面積との比較により要素サイズを決定することを特徴とする付記１記載の構造解析条件設定方法。
【００６８】
（付記３）前記第３の要素サイズ設定方法は、単位長さ当たりの要素サイズを基準値として予め登録しておき、これと線分の長さとの比較により要素サイズを決定することを特徴とする付記１又は付記２に記載の構造解析条件設定方法。
【００６９】
（付記４）前記第４の要素サイズ設定方法は、前記基準線の始点における要素サイズを基準値として予め登録しておき、これを基準線と曲線との距離に反映させて関数分布を求めることを特徴とする付記１〜付記３のいずれか１つに記載の構造解析条件設定方法。
【００７０】
（付記５）ポインティングデバイスを用いてモデルに色を塗り、色が塗られた領域にその色に関連付けられた荷重値の等分布荷重を設定する一方、ポインティングデバイスを用いてモデルの所定領域に荷重方向を示すラインを描画し、該所定領域にラインが示す荷重方向にその描画色に関連付けられた荷重値の集中荷重を設定する第１の荷重条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように二次元図形を描画し、該所定領域に二次元図形の大きさに比例した荷重値の等分布荷重を設定する一方、ポインティングデバイスを用いてモデルの所定領域に荷重方向を示すラインを描画し、該ラインに重畳するように二次元図形を描画し、前記所定領域にラインが示す荷重方向に二次元図形の大きさに比例した荷重値の集中荷重を設定する第２の荷重条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように線分を描画し、該所定領域に線分の長さに比例した荷重値の等分布荷重を設定する一方、ポインティングデバイスを用いてモデルの所定領域に荷重方向を示すラインを描画し、該所定領域にラインが示す荷重方向にその長さに比例した荷重値の集中荷重を設定する第３の荷重条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に重畳するように基準線及び曲線を描画し、該基準線と曲線との距離から関数分布を求め、前記所定領域に関数分布により定義される値を荷重値とする分布荷重を設定する第４の荷重条件設定方法と、の少なくとも１つを備えたことを特徴とする構造解析条件設定方法。
【００７１】
（付記６）前記第２の荷重条件設定方法は、単位面積当たりの荷重値を基準値として予め登録しておき、これと二次元図形の面積との比較により荷重値を決定することを特徴とする付記５記載の構造解析条件設定方法。
【００７２】
（付記７）前記第３の荷重条件設定方法は、単位長さ当たりの荷重値を基準値として予め登録しておき、これと線分の長さとの比較により荷重値を決定することを特徴とする付記５又は付記６に記載の構造解析条件設定方法。
【００７３】
（付記８）前記第４の荷重条件設定方法は、前記基準線の始点における荷重値を基準値として予め登録しておき、これを基準線と曲線との距離に反映させて関数分布を求めることを特徴とする付記５〜付記７のいずれか１つに記載の構造解析条件設定方法。
【００７４】
（付記９）ポインティングデバイスを用いてモデルに色を塗り、色が塗られた領域にその色に関連付けられた拘束条件を設定する第１の拘束条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に変位方向を示すラインを描画し、該ラインに重畳するように二次元図形を描画し、前記所定領域にラインが示す変位方向に二次元図形の大きさに比例した変位量だけ変位させる拘束条件を設定する第２の拘束条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に変位方向を示すラインを描画し、該所定領域にラインが示す変位方向にその長さに比例した変位量だけ変位させる拘束条件を設定する第３の拘束条件設定方法と、ポインティングデバイスを用いてモデルの所定領域に変位方向を示すラインを描画し、該所定領域にラインが示す変位方向にその描画色に関連付けられた変位量だけ変位させる拘束条件を設定する第４の拘束条件設定方法と、の少なくとも１つを備えたことを特徴とする構造解析条件設定方法。
【００７５】
（付記１０）前記第２の拘束条件設定方法は、単位面積当たりの変位量を基準値として予め登録しておき、これと二次元図形の面積との比較により変位量を決定することを特徴とする付記９記載の構造解析条件設定方法。
【００７６】
（付記１１）前記第３の拘束条件設定方法は、単位長さ当たりの変位量を基準値として予め登録しておき、これとラインの長さとの比較により変位量を決定することを特徴とする付記９又は付記１０に記載の構造解析条件設定方法。
【００７７】
（付記１２）前記モデルの所定領域は、色分けにより区画されることを特徴とする付記１〜付記１１のいずれか１つに記載の構造解析条件設定方法。
【００７８】
（付記１３）前記モデルの所定領域は、該モデルに重畳するように描画されたラインを、当該モデルに射影した線により区画されることを特徴とする付記１〜付記１２のいずれか１つに記載の構造解析条件設定方法。
【００７９】
【発明の効果】
以上説明したように、本発明に係る構造解析条件設定方法によれば、ポインティングデバイスを用いてモデルに色塗り，ライン描画，二次元図形描画又は線分描画などを行うことで、その所定領域に要素サイズ，荷重条件又は拘束条件を設定することができる。そして、このような操作は、視覚的かつ感覚的に行われることから、構造解析条件を極めて容易に設定することができる。
【図面の簡単な説明】
【図１】本発明を具現化した構造解析条件設定装置の全体構成図
【図２】領域の区画方法を示し、（Ａ）は色の塗り分けによる区画方法の説明図、（Ｂ）はライン射影による区画方法の説明図
【図３】要素サイズを設定する第１の方法を示し、（Ａ）は要素サイズが設定された三次元モデルの説明図、（Ｂ）はカラーパレットの説明図
【図４】要素サイズを設定する第２の方法の説明図
【図５】要素サイズを設定する第３の方法の説明図
【図６】要素サイズを設定する第４の方法の説明図
【図７】荷重条件を設定する第１の方法を示し、（Ａ）は等分布荷重が設定された三次元モデルの説明図、（Ｂ）はカラーパレットの説明図、（Ｃ）は集中荷重が設定された三次元モデルの説明図
【図８】荷重条件を設定する第２の方法を示し、（Ａ）は等分布荷重が設定された三次元モデルの説明図、（Ｂ）は集中荷重が設定された三次元モデルの説明図
【図９】荷重条件を設定する第３の方法を示し、（Ａ）は等分布荷重が設定された三次元モデルの説明図、（Ｂ）は集中荷重が設定された三次元モデルの説明図
【図１０】荷重条件を設定する第４の方法の説明図
【図１１】拘束条件を設定する第１の方法を示し、（Ａ）は拘束条件が設定された三次元モデルの説明図、（Ｂ）はカラーパレットの説明図
【図１２】拘束条件を設定する第２の方法の説明図
【図１３】拘束条件を設定する第３の方法の説明図
【図１４】拘束条件を設定する第４の方法を示し、（Ａ）は拘束条件が設定された三次元モデルの説明図、（Ｂ）はカラーパレットの説明図
【図１５】形状定義更新機能を実現するためのフローチャート
【図１６】領域分割の説明図
【図１７】要素サイズ設定機能を実現するためのフローチャート
【図１８】荷重条件設定機能を実現するためのフローチャート
【図１９】拘束条件設定機能を実現するためのフローチャート
【符号の説明】
１０ ポインティングデバイス
２０ モニタ
３０ 処理装置
３０Ａ 形状定義更新機能
３０Ｂ 要素サイズ設定機能
３０Ｃ 荷重条件設定機能
３０Ｄ 拘束条件設定機能
３０Ｅ データベース[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for easily setting various conditions required for structural analysis.
[0002]
[Prior art]
At the time of structural analysis, as described in Patent Document 1, the model is divided into elements (mesh) of a predetermined size, and various conditions such as load conditions and constraint conditions are applied to each element as necessary. Must be set.
[0003]
[Patent Document 1]
JP 2002-149712 A
[0004]
[Problems to be solved by the invention]
However, in the conventional structural analysis system, when setting not only conditions for dividing a model by elements but also other conditions for each element, the numerical values have to be manually input. Therefore, there is a problem that the operation of setting the structural analysis conditions is complicated, and it is difficult to intuitively grasp the setting conditions.
[0005]
Accordingly, the present invention has been made in view of the above-described conventional problems, and enables a structure analysis condition to be set by a pointing device such as a mouse or a light pen for each region obtained by dividing a model, thereby enabling a structure analysis. An object of the present invention is to provide a method for setting structural analysis conditions that facilitates setting of various necessary conditions.
[0006]
[Means for Solving the Problems]
For this reason, in the structural analysis condition setting method according to the present invention, the element size, the load condition, and the constraint condition are set by the following various methods.
[0007]
(1) Element size setting method
The model is painted with a color using a pointing device, and an element size associated with the color is set in the painted area. Further, a two-dimensional figure or a line segment is drawn so as to be superimposed on a predetermined area of the model by using a pointing device, and an element size proportional to the size of the two-dimensional figure or the length of the line segment is set in the predetermined area. Furthermore, a reference line and a curve are drawn so as to be superimposed on a predetermined area of the model using a pointing device, a function distribution is obtained from a distance between the reference line and the curve, and a value defined by the function distribution is determined in the predetermined area by an element size. Set as At this time, it is desirable to register a reference value per unit area or unit length in advance, and determine the element size by comparing this with a two-dimensional figure or line segment. In addition, it is desirable that the element size at the start point of the reference line be registered in advance as a reference value, and that this be reflected in the distance between the reference line and the curve to obtain a function distribution.
[0008]
In this case, the element size is set in a predetermined area by performing color painting, line drawing, two-dimensional figure drawing, line segment drawing, or the like on the model using the pointing device. Since such an operation is performed visually and intuitively, the element size as one of the structural analysis conditions can be set very easily.
[0009]
(2) Setting method of load condition
Using a pointing device to paint a color on the model and setting the uniform distribution load of the load value associated with the color in the colored area, while using a pointing device to indicate the load direction in a predetermined area of the model Is drawn, and the concentrated load of the load value associated with the drawing color is set in the load direction indicated by the line in the predetermined area. In addition, a two-dimensional figure or a line segment is drawn so as to be superimposed on a predetermined area of the model using a pointing device, and a uniform distribution load of a load value proportional to the size of the two-dimensional figure or the length of the line segment is drawn in the predetermined area. On the other hand, a line indicating the load direction is drawn in a predetermined area of the model using a pointing device, a two-dimensional figure or a line segment is drawn so as to be superimposed on the line, and two lines are drawn in the predetermined area in the load direction indicated by the line. A concentrated load having a load value proportional to the size of a dimensional figure or the length of a line segment is set. Further, a reference line and a curve are drawn so as to be superimposed on a predetermined area of the model using a pointing device, a function distribution is obtained from a distance between the reference line and the curve, and a value defined by the function distribution is weighted in the predetermined area. Is set. At this time, it is desirable to register a reference value per unit area or unit length in advance, and determine the load value by comparing this with a two-dimensional figure or a line segment. In addition, it is desirable that the load value at the starting point of the reference line be registered in advance as a reference value, and that this be reflected in the distance between the reference line and the curve to obtain a function distribution.
[0010]
With this configuration, the color condition, the line drawing, the two-dimensional figure drawing, the line segment drawing, and the like are performed on the model using the pointing device, so that the load condition is set in the predetermined area. Since such an operation is performed visually and intuitively, the load condition as one of the structural analysis conditions can be set very easily.
[0011]
(3) Setting method of constraint conditions
A model is painted with a color using a pointing device, and a constraint condition associated with the color is set in the painted area. In addition, a line indicating the displacement direction is drawn in a predetermined area of the model using a pointing device, and a two-dimensional figure is drawn so as to be superimposed on the line. A constraint condition for displacing by a proportional displacement amount is set. Further, a line indicating a displacement direction is drawn in a predetermined region of the model using a pointing device, and a constraint condition for displacing the displacement direction indicated by the line in the predetermined region by a displacement amount proportional to its length is set. In addition, a line indicating a displacement direction is drawn in a predetermined region of the model using a pointing device, and a constraint condition for displacing in the displacement direction indicated by the line by a displacement amount associated with the drawing color in the predetermined region is set. At this time, it is desirable to register a reference value per unit area or unit length in advance, and determine the displacement amount by comparing this with a two-dimensional figure or line.
[0012]
With this configuration, the coloring condition, the line drawing, the two-dimensional figure drawing, the line segment drawing, and the like are performed on the model using the pointing device, so that the constraint condition is set in the predetermined area. Since such an operation is performed visually and intuitively, a constraint condition as one of the structural analysis conditions can be set very easily.
[0013]
Further, it is preferable that the predetermined region of the model is divided by a line obtained by projecting a line drawn so as to be colored or superimposed on the model onto the model. By doing so, the area is partitioned by a simple and intuitive operation, so that the labor can be greatly reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an overall configuration of a structural analysis condition setting device that embodies a structural analysis condition setting method according to the present invention and outputs an analysis condition to a structural analysis system.
[0015]
The structure analysis condition setting device includes a pointing device 10 such as a mouse or a light pen, a monitor 20 such as a CRT (Cathode Ray Tube) or an LCD (Liquid Crystal Display), and a processing device 30 including at least a central processing unit and a memory. And is comprised. In the processing device 30, a shape definition update function 30A, an element size setting function 30B, a load condition setting function 30C, and a constraint condition setting function 30D are each realized by a program loaded in the memory. The processing device 30 includes a database 30E in which various tables are registered.
[0016]
In the shape definition update function 30A, when the coloring or the line drawing is performed by the pointing device 10 so as to be superimposed on the three-dimensional model displayed on the monitor 20, the shape definition updating function 30A is divided by the coloring or the line as necessary. A function is provided that divides a region to be updated from another region and updates it as a new shape definition. The element size setting function 30B, the load condition setting function 30C, and the constraint condition setting function 30D provide a function of setting an element size, a load condition, and a constraint condition for a predetermined region of the three-dimensional model, respectively. On the other hand, the database 30E includes a color palette definition table, an element size definition table, a load value definition table, a displacement amount definition table, a constraint condition definition table, a shape definition setting table, an element size setting table, a load condition setting table, and a constraint condition setting. Each table is registered.
[0017]
In the color palette definition table, as shown in Table 1, color values and values of R (Red), G (Green), and B (Blue) components (in the case of 8 bits, , 0-255) are registered. It is desirable that the color pallet has a configuration that can be arbitrarily changed, added, and deleted.
[0018]
[Table 1]

In the element size definition table, as shown in Table 2, the element size for dividing the three-dimensional model for each color uniquely specified by the color number is registered in order to define the element size associated with each color. It is desirable that the element size corresponding to each color be arbitrarily changed, added, and deleted.
[0019]
[Table 2]

In the load value definition table, in order to define the load value associated with each color, as shown in Table 3, the load (concentrated load or uniform distribution) applied to the three-dimensional model for each color uniquely specified by the color number Load) is registered. As the load value, the magnitude of the force acting on one point in the case of a concentrated load, and the magnitude of the force acting per unit area in the case of a uniformly distributed load are used. In addition, it is desirable that the load value corresponding to each color can be arbitrarily changed, added, and deleted.
[0020]
[Table 3]

In the displacement amount definition table, as shown in Table 4, the displacement amount when the 3D model is forcibly displaced for each color uniquely specified by the color number is registered in order to define the displacement amount associated with each color. Is done. In addition, it is desirable that the displacement amount corresponding to each color be configured to be arbitrarily changeable, added, and deleted.
[0021]
[Table 4]

In the constraint definition table, as shown in Table 5, the constraint of the three-dimensional model is registered for each color uniquely specified by the color number in order to define the constraint associated with each color. As the constraint condition, six degrees of freedom in the three-dimensional model, that is, “degrees of freedom 1” to “degrees of freedom” indicating displacement amounts around the x-axis, y-axis, z-axis, around the x-axis, around the y-axis, and around the z-axis. A degree of freedom of 6 "is used. Here, when the degree of freedom is 0, it indicates that the three-dimensional model is not displaced in or around the axial direction. Further, “−” in the table indicates that the degree of freedom is not set. In addition, it is desirable that the constraint conditions corresponding to each color have a configuration that can be arbitrarily changed, added, and deleted.
[0022]
[Table 5]

When a three-dimensional model is created or updated by a three-dimensional CAD (Computer Aided Design) or the like, as shown in Table 6, points, curves, surfaces, solids, and the like constituting the three-dimensional model are stored in the shape definition setting table. The shape number, shape type and its constituent elements are registered for each of the various shapes. Also, when a new area is divided by the shape definition update function 30A as a result of the structure analysis condition setting process, the shape number, shape type and its constituent elements defining the area are added to the shape definition setting table. be registered.
[0023]
[Table 6]

In the element size setting table, as a result of the structure analysis condition setting processing, as shown in Table 7, for various shapes (particularly regions) uniquely specified by the shape numbers, the element sizes for dividing the shapes are registered. Here, for the area (F1.3) where the element size is “function 1”, it is assumed that the element size to be divided is defined by the function, and is associated with the entity of the function by a link. (The same applies hereinafter).
[0024]
[Table 7]

In the load condition setting table, as shown in Table 8, a load number, a load type (concentrated load or distribution) are used to associate load conditions with various shapes uniquely specified by shape numbers as a result of the structural analysis condition setting process. A load, a load value, a vector (a unit vector or a normal vector), and a shape number are registered.
[0025]
[Table 8]

As shown in Table 9, the constraint condition setting table contains constraint numbers, degrees of freedom 1 to degrees of freedom 6 as shown in Table 9 in order to associate constraint conditions with various shapes uniquely specified by shape numbers as a result of the structure analysis condition setting process. And the shape number are registered.
[0026]
[Table 9]

Here, as a basic process of the structural analysis condition setting device, a method of selecting a color used for setting an element size, a load condition, and a constraint condition will be described. As a first method, a color palette is displayed on the monitor 20, and a desired color is selected from the color palette. As a second method, the speed at which the pointing device 10 is moved and the color are registered in association with each other, and a color corresponding to the operation speed at the time of color painting or line drawing is selected. At this time, when only the fastest and the slowest are registered as the operation speeds, a color obtained by interpolating these is selected for the intermediate speed. As a third method, for example, whenever a color painting or line drawing is performed, a color is automatically selected according to a predetermined rule so that colors in a color palette are sequentially selected in descending order or ascending order. At this time, it is desirable that the user can freely specify whether to sequentially select the colors of the color palette in descending or ascending order.
[0027]
In the structure analysis condition setting device, a region of the three-dimensional model to be processed is partitioned by two methods. That is, as shown in FIG. 2A, when the surface of the three-dimensional model is painted in different colors using the pointing device 10, the regions respectively defined by the colors are processed. At this time, in the color separation as shown in the drawing, there are portions where a plurality of colors are superimposed, but the color painted on the foreground may be prioritized. On the other hand, as shown in FIG. 2B, when a line is drawn so as to be superimposed on the three-dimensional model using the pointing device 10, the line is projected and reflected on the surface of the three-dimensional model. Specifically, the drawn line is recognized as a line segment on a plane ax + by + cz = d having a vector (a, b, c) perpendicular to the monitor 20 as a normal vector. Project this on the surface of the three-dimensional model.
[0028]
Next, an outline of processing for setting various structural analysis conditions for a three-dimensional model by utilizing such basic processing will be described.
(1) Element size setting method
(A) First method (first element size setting method)
After referring to the color palette definition table and the element size definition table and associating each color with the element size, the color palette is displayed on the monitor 20 as shown in FIG. Then, using the pointing device 10, a color corresponding to a desired element size is selected from the color palette, and a predetermined area of the three-dimensional model is colored as shown in FIG. After that, the element size specified by the color is set for the predetermined colored area. At this time, since the designation of the area and the element size are performed simultaneously, the operation can be simplified.
[0029]
(B) Second method (second element size setting method)
Using the pointing device 10, as shown in FIG. 4, a two-dimensional figure (such as a circle or a square) serving as a measure of the element size is superimposed on a predetermined area of the three-dimensional model defined by coloring or lines. draw. Then, for a predetermined area where the two-dimensional graphic is drawn, an element size is set in proportion to the size of the two-dimensional graphic. As the element size, the size of the two-dimensional figure may be used as it is, or the element size per unit area may be registered in advance as a reference value and determined by comparing this with the two-dimensional figure. You may.
[0030]
(C) Third method (third element size setting method)
As shown in FIG. 5, the pointing device 10 is used to draw a line segment serving as a measure of the element size so as to be superimposed on a predetermined region of the three-dimensional model defined by coloring or lines. Then, an element size proportional to the length of the line segment is set for a predetermined area where the line segment is drawn. As the element size, the length of the line segment may be used as it is, or the element size per unit length may be registered in advance as a reference value and determined by comparing this with the line segment. Is also good.
[0031]
(D) Fourth method (fourth element size setting method)
As shown in FIG. 6, a reference line and a curve are drawn using the pointing device 10 so as to be superimposed on a predetermined area of the three-dimensional model defined by coloring or lines. Then, a function distribution for determining the element size from the distance between the reference line and the curve is created. At this time, it is desirable that the element size is registered in advance as the reference value for the starting point of the reference line, and the size of the other parts is determined by comparison with this. Thereafter, the three-dimensional model is divided into a plurality of regions with a predetermined width in a direction in which the reference line extends, and a value defined by a function distribution for each region is set as an element size. This makes it possible to easily set a complicated element size for a predetermined region of the three-dimensional model. In the illustrated example, the entire surface of the three-dimensional model is set in one predetermined region (the same applies hereinafter).
(2) Setting method of load condition
(A) First method (first load condition setting method)
After referring to the color palette definition table and the load value definition table and associating each color with the load value, the color palette is displayed on the monitor 20 as shown in FIG. 7B. Then, using the pointing device 10, a color corresponding to the desired load value is selected from the color palette, and a predetermined area of the three-dimensional model is colored, as shown in FIG. After that, a uniform distribution load of a load value specified by the color is set for the predetermined area where the color is applied.
[0032]
After a color corresponding to a desired load value is selected from the color palette, a predetermined color of a three-dimensional model partitioned by a line or a line is used as shown in FIG. A line indicating the load direction is drawn in the area. Then, for a predetermined area of the three-dimensional model, a concentrated load having a load value specified by the drawing color is set in the load direction indicated by the line.
[0033]
(B) Second method (second load condition setting method)
Using the pointing device 10, as shown in FIG. 8A, a two-dimensional figure serving as a measure of the load value is drawn so as to be superimposed on a predetermined area of the three-dimensional model defined by coloring or lines. Then, for a predetermined area where the two-dimensional figure is drawn, an evenly distributed load having a load value proportional to the size of the two-dimensional figure is set. As the load value, a load value per unit area may be registered in advance as a reference value, and may be determined by comparing this with a two-dimensional figure (the same applies hereinafter).
[0034]
Further, as shown in FIG. 2B, a line indicating the load direction is drawn in a predetermined area of the three-dimensional model defined by coloring or lines, using the pointing device 10. Then, a two-dimensional figure serving as a measure of the load value is drawn so as to be superimposed on the line. Then, for a predetermined area where the two-dimensional figure is drawn, a concentrated load having a load value proportional to the size of the two-dimensional figure is set in the load direction indicated by the line.
[0035]
(C) Third method (third load condition setting method)
Using the pointing device 10, as shown in FIG. 9A, a line segment serving as a guide of the load value is drawn so as to be superimposed on a predetermined region of the three-dimensional model defined by coloring or lines. Then, for a predetermined area on which the line segment is drawn, an evenly distributed load having a load value proportional to the length is set.
[0036]
Further, as shown in FIG. 2B, a line indicating the load direction is drawn in a predetermined area of the three-dimensional model defined by coloring or lines, using the pointing device 10. Then, for a predetermined region of the three-dimensional model, a concentrated load having a load value proportional to the length of the line is set in the load direction indicated by the line.
[0037]
(D) Fourth method (fourth load condition setting method)
As shown in FIG. 10, a reference line and a curve are drawn using the pointing device 10 so as to be superimposed on a predetermined area of the three-dimensional model defined by coloring or lines. Then, a function distribution for determining the load value from the distance between the reference line and the curve is created. At this time, it is desirable that the load value is registered in advance as a reference value at the start point of the reference line, and the size of the other portions is determined by comparison with this. Thereafter, the three-dimensional model is divided into a plurality of regions with a predetermined width in a direction in which the reference line extends, and a value defined by a function distribution for each region is set as a load value. With this configuration, a complicated load value can be easily set for a predetermined region of the three-dimensional model.
(3) Setting method of constraint conditions
(A) First method (first constraint condition setting method)
After referring to the color palette definition table and the constraint condition definition table and associating each color with the constraint condition, the color palette is displayed on the monitor 20 as shown in FIG. 11B. Here, “translation” in the table indicates that the displacement is regulated with respect to the degree of freedom. Then, using the pointing device 10, a color corresponding to the desired constraint condition is selected from the color palette, and a predetermined area of the three-dimensional model is colored as shown in FIG. After that, a constraint condition specified by the color is set for a predetermined area that has been colored. At this time, since the designation of the area and the constraint condition is performed simultaneously, the operation can be simplified.
[0038]
(B) Second method (second constraint condition setting method)
Using the pointing device 10, as shown in FIG. 12, a line indicating the displacement direction is drawn in a predetermined area of the three-dimensional model defined by coloring or lines. Then, a two-dimensional figure serving as a measure of the amount of displacement is drawn so as to be superimposed on the line. Thereafter, for a predetermined area of the three-dimensional model, a constraint condition for forcibly displacing in the displacement direction indicated by the line by a displacement amount proportional to the size of the two-dimensional figure is set.
[0039]
(C) Third method (third constraint condition setting method)
Using the pointing device 10, as shown in FIG. 13, a line indicating the displacement direction is drawn in a predetermined area of the three-dimensional model defined by coloring or lines. Then, for a predetermined area of the three-dimensional model, a constraint condition for forcibly displacing in the displacement direction indicated by the line by a displacement amount proportional to the length of the line is set.
[0040]
(D) Fourth method (fourth constraint condition setting method)
After referring to the color palette definition table and the displacement amount definition table and associating each color with the displacement amount, the color palette is displayed on the monitor 20 as shown in FIG. Then, using the pointing device 10, a color corresponding to a desired displacement amount is selected from the color palette, and as shown in FIG. , A line indicating the displacement direction is drawn. After that, for a predetermined area of the three-dimensional model, a constraint condition for forcibly displacing in the displacement direction indicated by the line by the displacement amount specified by the drawing color is set.
[0041]
FIG. 15 shows a flowchart of a process for realizing the shape definition updating function 30A. Note that this processing is executed when color painting or line drawing for dividing an area is performed on the three-dimensional model.
[0042]
In step 1 (abbreviated as “S1” in the figure; the same applies hereinafter), color painting information or line information made on the three-dimensional model is read. Here, the “coloring information” and the “line information” correspond to data including at least coordinate values that can specify the shape.
[0043]
In step 2, the area defined by the color or the line is divided. That is, as shown in FIG. 16, when a color is applied to one surface (F1) of the three-dimensional model, the color is divided into regions partitioned by the color.
[0044]
In step 3, new shape numbers (F1.1 and F1.2) are assigned to the divided areas, and the shape definition is additionally registered and updated in the shape definition setting table.
In step 4, it is determined whether or not the shape definition setting table has been updated normally. Then, if the shape definition setting table is updated normally, the process ends (Yes), and if not updated, the process returns to step 1 (No).
[0045]
According to this processing, when color painting or line drawing is performed on the three-dimensional model to divide the region, the region divided by the color painting or line is divided, and the shape definition is registered in the database. For this reason, the area is partitioned by a simple and intuitive operation, and the labor can be greatly reduced.
[0046]
FIG. 17 shows a flowchart of a process for realizing the element size setting function 30B. This processing is executed, for example, when an element size setting command is selected from a menu.
[0047]
In step 11, element size definition information is read. That is, in the first method of setting the element size, the element size is associated with each color by referring to the color palette definition table and the element size definition table. In the second method or the third method, a reference value per unit area or unit length is read as necessary.
[0048]
In step 12, it is determined whether or not the element size is set by the function distribution definition, that is, whether or not the element size is set by the fourth method. If the element size is set based on the function distribution definition, the process proceeds to step 13 (Yes), and a distribution definition function is obtained from the reference line and the curve drawn in a predetermined area of the three-dimensional model. On the other hand, if the element size is not set by the function distribution definition, the process proceeds to step 14 (No).
[0049]
In step 14, the element size is determined by means according to the element size setting method. For details of the means for determining the element size, refer to the above-described first to fourth methods.
[0050]
In step 15, the element size is additionally registered in the element size setting table in association with the shape definition.
In step 16, it is determined whether the element size has been registered normally. Then, if the element size is registered normally, the process ends (Yes), and if it is not registered properly, the process returns to step 11 (No).
[0051]
According to this element size setting processing, the coloring, line drawing, two-dimensional figure drawing, line segment drawing, or the like is performed on the three-dimensional model using the pointing device 10, so that the element size is set in the predetermined area. Is done. Since such an operation is performed visually and intuitively, the element size as one of the structural analysis conditions can be set very easily.
[0052]
FIG. 18 shows a flowchart of a process for realizing the load condition setting function 30C. This processing is executed, for example, when a load condition setting command is selected from a menu.
[0053]
In step 21, load condition definition information is read. That is, in the first method for setting the load condition, the load value is associated with each color by referring to the color palette definition table and the load value definition table. In the second method or the third method, a reference value per unit area or unit length is read as necessary.
[0054]
In step 22, it is determined whether or not the load condition is set according to the function distribution definition, that is, whether or not the load condition is set by the fourth method. Then, if the load condition is set by the function distribution definition, the process proceeds to step 23 (Yes), and the distribution definition function is obtained from the reference line and the curve drawn in the predetermined area of the three-dimensional model. On the other hand, if the load condition is not set according to the function distribution definition, the process proceeds to step 24 (No).
[0055]
In step 24, it is determined whether the load direction is defined by the line. If the load direction is defined by the line, the process proceeds to step 25 (Yes), and the direction vector is normalized to obtain a unit vector. On the other hand, if the load condition is not defined by the line, the load direction is regarded as a normal vector perpendicular to the region, and the process proceeds to step 26 (No).
[0056]
In step 26, the load condition is determined by means corresponding to the method of setting the load condition. For details of the means for determining the load condition, refer to the first to fourth methods described above.
[0057]
In step 27, the load condition is additionally registered in the load condition setting table.
In step 28, it is determined whether the load condition has been registered normally. Then, if the load condition is registered normally, the process is terminated (Yes), and if not, the process returns to step 21 (No).
[0058]
According to the load condition setting processing, the color condition, the line drawing, the two-dimensional figure drawing, the line segment drawing, and the like are performed on the three-dimensional model using the pointing device 10, and the load condition is set in the predetermined area. Is done. Since such an operation is performed visually and intuitively, the load condition as one of the structural analysis conditions can be set very easily.
[0059]
FIG. 19 shows a flowchart of a process for realizing the constraint condition setting function 30D. This processing is executed, for example, when a constraint condition setting command is selected from a menu.
[0060]
In step 31, the constraint condition definition information is read. That is, in the first method of setting the constraint condition, the load condition is associated with each color by referring to the color palette definition table and the constraint condition definition table. In the second method or the third method, a reference value per unit area or unit length is read. Further, in the fourth method, the displacement amount is associated with each color by referring to the color palette definition table and the displacement amount definition table.
[0061]
In step 32, it is determined whether the degree of freedom (direction) of the forced displacement is defined by the line. If the degree of freedom of the forced displacement is defined by the line, the process proceeds to step 33 (Yes), and the amount of displacement of each degree of freedom is obtained from the direction vector of the line. On the other hand, if the degree of freedom of the forced displacement is not defined by the line, the process proceeds to step 34 (No).
[0062]
In step 34, the constraint condition is determined by means depending on the method of setting the constraint condition. For details of the means for determining the constraint condition, refer to the first to fourth methods described above.
[0063]
In step 35, the constraint condition is additionally registered in the constraint condition setting table.
In step 36, it is determined whether the constraint condition has been registered normally. Then, if the constraint condition is registered normally, the process is terminated (Yes), and if not, the process returns to step 31 (No).
[0064]
According to the constraint condition setting process, the coloring condition, the line drawing, the two-dimensional figure drawing, the line segment drawing, and the like are performed on the three-dimensional model using the pointing device 10, so that the constraint condition is set in the predetermined area. Is done. Since such an operation is performed visually and intuitively, a constraint condition as one of the structural analysis conditions can be set very easily.
[0065]
In the above description, the method of setting the structural analysis conditions for the three-dimensional model has been described. However, it is needless to say that the structural analysis conditions can be extremely easily set for the two-dimensional model by the same method.
[0066]
(Supplementary Note 1) A first element size setting method in which a model is painted with a color using a pointing device and an element size associated with the color is set in the painted area, and a predetermined model is modeled using the pointing device A second element size setting method of drawing a two-dimensional figure so as to be superimposed on the area and setting an element size in proportion to the size of the two-dimensional figure in the predetermined area; A third element size setting method of drawing a line segment so as to be superimposed, and setting an element size in proportion to the length of the line segment in the predetermined region, and superimposing the line segment on a predetermined region of the model using a pointing device Draw a reference line and a curve, obtain a function distribution from the distance between the reference line and the curve, and set a value defined by the function distribution as an element size in the predetermined area. Structure analysis condition setting method 4 and element sizing method, characterized by comprising at least one of which.
[0067]
(Supplementary Note 2) The second element size setting method is characterized in that the element size per unit area is registered in advance as a reference value, and the element size is determined by comparing this with the area of the two-dimensional figure. 3. A method for setting structural analysis conditions according to claim 1.
[0068]
(Supplementary Note 3) The third element size setting method is characterized in that an element size per unit length is registered in advance as a reference value, and the element size is determined by comparing this with the length of a line segment. The method for setting structural analysis conditions according to Supplementary Note 1 or 2.
[0069]
(Supplementary Note 4) In the fourth element size setting method, an element size at a start point of the reference line is registered in advance as a reference value, and the function size is calculated by reflecting the reference value on a distance between the reference line and the curve. The structural analysis condition setting method according to any one of Supplementary Notes 1 to 3, characterized in that:
[0070]
(Supplementary Note 5) A model is painted with a color using a pointing device, and a uniform distribution load of a load value associated with the color is set in the colored region, while a load is applied to a predetermined region of the model using the pointing device. A first load condition setting method of drawing a line indicating a direction, and setting a concentrated load of a load value associated with the drawing color in the load direction indicated by the line in the predetermined area; and a method of setting a model using a pointing device. A two-dimensional figure is drawn so as to be superimposed on the area, and a uniform distribution load of a load value proportional to the size of the two-dimensional figure is set in the predetermined area, and the load direction is set in a predetermined area of the model using a pointing device. Draws a line shown, draws a two-dimensional figure so as to be superimposed on the line, and loads a load proportional to the size of the two-dimensional figure in the load direction shown by the line in the predetermined area. A second load condition setting method for setting a concentrated load of values, a line segment is drawn using a pointing device so as to be superimposed on a predetermined region of the model, and a load value proportional to the length of the line segment in the predetermined region. While setting the uniformly distributed load, a line indicating the load direction is drawn in a predetermined area of the model using a pointing device, and a concentrated load of a load value proportional to the length in the load direction indicated by the line is drawn in the predetermined area. A third load condition setting method to be set, and drawing a reference line and a curve so as to be superimposed on a predetermined region of the model using a pointing device; obtaining a function distribution from a distance between the reference line and the curve; And a fourth load condition setting method for setting a distributed load having a load value defined by a function distribution.
[0071]
(Supplementary Note 6) The second load condition setting method is characterized in that a load value per unit area is registered in advance as a reference value, and the load value is determined by comparing this with the area of a two-dimensional figure. 5. A method for setting structural analysis conditions according to Supplementary Note 5.
[0072]
(Supplementary Note 7) The third load condition setting method is characterized in that a load value per unit length is registered in advance as a reference value, and the load value is determined by comparing this with a length of a line segment. 5. The method for setting structural analysis conditions according to Supplementary Note 5 or 6.
[0073]
(Supplementary Note 8) In the fourth load condition setting method, a load distribution at a start point of the reference line is registered in advance as a reference value, and the registered load value is reflected on a distance between the reference line and the curve to obtain a function distribution. The structural analysis condition setting method according to any one of Supplementary Notes 5 to 7, characterized in that:
[0074]
(Supplementary Note 9) A first constraint condition setting method that paints a color on a model using a pointing device, and sets a constraint condition associated with the color in an area where the color is painted, and a predetermined model of the model using the pointing device Draw a line indicating a displacement direction in an area, draw a two-dimensional figure so as to overlap the line, and displace in the displacement direction indicated by the line in the predetermined area by a displacement amount proportional to the size of the two-dimensional figure. A second constraint condition setting method for setting conditions, a line indicating a displacement direction is drawn in a predetermined region of the model using a pointing device, and a displacement amount proportional to the length in the displacement direction indicated by the line in the predetermined region A third constraint condition setting method for setting a constraint condition for only displacement, and drawing a line indicating a displacement direction in a predetermined region of the model using a pointing device; And a fourth constraint condition setting method for setting a constraint condition for displacing a displacement amount associated with the drawing color in the displacement direction indicated by the line in the constant area. Setting method.
[0075]
(Supplementary Note 10) The second constraint condition setting method is characterized in that the displacement amount per unit area is registered in advance as a reference value, and the displacement amount is determined by comparing this with the area of the two-dimensional figure. 9. The method for setting structural analysis conditions according to supplementary note 9.
[0076]
(Supplementary Note 11) The third constraint condition setting method is characterized in that a displacement amount per unit length is registered in advance as a reference value, and the displacement amount is determined by comparing this with a line length. A structural analysis condition setting method according to Supplementary Note 9 or 10.
[0077]
(Supplementary Note 12) The structural analysis condition setting method according to any one of Supplementary Notes 1 to 11, wherein the predetermined region of the model is partitioned by color.
[0078]
(Supplementary Note 13) The image forming apparatus according to any one of Supplementary Notes 1 to 12, wherein the predetermined region of the model is defined by a line drawn so as to be superimposed on the model and projected to the model. The method for setting structural analysis conditions described.
[0079]
【The invention's effect】
As described above, according to the structure analysis condition setting method according to the present invention, the model is colored, line-drawn, two-dimensional figure-drawn or line-segment-drawn using a pointing device, so that the predetermined region Element size, load condition or constraint condition can be set. Since such an operation is performed visually and intuitively, the structural analysis conditions can be set very easily.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a structural analysis condition setting device embodying the present invention.
FIGS. 2A and 2B show an area dividing method, in which FIG. 2A is an explanatory diagram of a dividing method based on different colors, and FIG.
3A and 3B show a first method of setting an element size, wherein FIG. 3A is an explanatory diagram of a three-dimensional model in which an element size is set, and FIG. 3B is an explanatory diagram of a color palette;
FIG. 4 is an explanatory diagram of a second method for setting an element size.
FIG. 5 is an explanatory diagram of a third method for setting an element size.
FIG. 6 is an explanatory diagram of a fourth method for setting an element size.
7A and 7B show a first method for setting a load condition, wherein FIG. 7A is an explanatory diagram of a three-dimensional model in which uniformly distributed loads are set, FIG. 7B is an explanatory diagram of a color palette, and FIG. Of 3D model set with
8A and 8B show a second method for setting a load condition, wherein FIG. 8A is an explanatory diagram of a three-dimensional model in which uniformly distributed loads are set, and FIG. 8B is an explanatory diagram of a three-dimensional model in which concentrated loads are set.
9A and 9B show a third method for setting a load condition, wherein FIG. 9A is an explanatory diagram of a three-dimensional model in which uniformly distributed loads are set, and FIG. 9B is an explanatory diagram of a three-dimensional model in which concentrated loads are set.
FIG. 10 is an explanatory diagram of a fourth method for setting a load condition.
11A and 11B show a first method for setting a constraint condition, wherein FIG. 11A is an explanatory diagram of a three-dimensional model in which a constraint condition is set, and FIG. 11B is an explanatory diagram of a color palette.
FIG. 12 is an explanatory diagram of a second method for setting a constraint condition.
FIG. 13 is an explanatory diagram of a third method for setting a constraint condition.
14A and 14B illustrate a fourth method of setting a constraint condition, wherein FIG. 14A is an explanatory diagram of a three-dimensional model in which a constraint condition is set, and FIG. 14B is an explanatory diagram of a color palette.
FIG. 15 is a flowchart for realizing a shape definition updating function;
FIG. 16 is an explanatory diagram of area division.
FIG. 17 is a flowchart for realizing an element size setting function.
FIG. 18 is a flowchart for realizing a load condition setting function.
FIG. 19 is a flowchart for realizing a constraint condition setting function.
[Explanation of symbols]
10 Pointing device
20 monitors
30 processing equipment
30A Shape definition update function
30B Element size setting function
30C Load condition setting function
30D constraint condition setting function
30E database

Claims (5)

A first element size setting method of applying a color to the model using a pointing device, and setting an element size associated with the color in the colored area;
A second element size setting method of drawing a two-dimensional figure so as to be superimposed on a predetermined area of the model using a pointing device, and setting an element size in the predetermined area in proportion to the size of the two-dimensional figure;
A third element size setting method of drawing a line segment so as to be superimposed on a predetermined region of the model using a pointing device, and setting an element size proportional to the length of the line segment in the predetermined region;
A reference line and a curve are drawn so as to be superimposed on a predetermined region of the model using a pointing device, a function distribution is obtained from a distance between the reference line and the curve, and a value defined by the function distribution is expressed in the predetermined region as an element size. A fourth element size setting method set as
A structural analysis condition setting method comprising at least one of the following. Using a pointing device to paint a color on the model and setting the uniform distribution load of the load value associated with the color in the colored area, while using a pointing device to indicate the load direction in a predetermined area of the model And a first load condition setting method of drawing a concentrated load of a load value associated with the drawing color in a load direction indicated by a line in the predetermined area,
A two-dimensional figure is drawn so as to be superimposed on a predetermined area of the model using a pointing device, and a uniform distribution load of a load value proportional to the size of the two-dimensional figure is set in the predetermined area, while using a pointing device. A line indicating the load direction is drawn in a predetermined area of the model, a two-dimensional figure is drawn so as to be superimposed on the line, and a load value proportional to the size of the two-dimensional figure in the load direction indicated by the line in the predetermined area is drawn. A second load condition setting method for setting a concentrated load,
A line segment is drawn so as to be superimposed on a predetermined region of the model using a pointing device, and a uniform distribution load having a load value proportional to the length of the line segment is set in the predetermined region, while the model is modeled using the pointing device. A third load condition setting method of drawing a line indicating the load direction in the predetermined area, and setting a concentrated load having a load value proportional to the length in the load direction indicated by the line in the predetermined area;
A reference line and a curve are drawn so as to be superimposed on a predetermined area of the model using a pointing device, a function distribution is obtained from a distance between the reference line and the curve, and a value defined by the function distribution is weighted in the predetermined area. A fourth load condition setting method for setting a distributed load to be
A structural analysis condition setting method comprising at least one of the following. A first constraint condition setting method of painting a color on the model using a pointing device, and setting a constraint condition associated with the color in the painted region;
Using a pointing device, draw a line indicating the displacement direction in a predetermined area of the model, draw a two-dimensional figure so as to overlap the line, and reduce the size of the two-dimensional figure in the displacement direction indicated by the line in the predetermined area. A second constraint condition setting method for setting a constraint condition for displacing by a proportional displacement amount,
A third constraint condition in which a line indicating a displacement direction is drawn in a predetermined region of the model using a pointing device, and a constraint condition for displacing the displacement direction indicated by the line in the predetermined region by a displacement amount proportional to the length thereof is set. Setting method,
A fourth constraint that draws a line indicating a displacement direction in a predetermined area of the model using a pointing device and sets a constraint condition to displace the displacement direction indicated by the line in the predetermined area by a displacement amount associated with the drawing color. Condition setting method,
A structural analysis condition setting method comprising at least one of the following. The structural analysis condition setting method according to claim 1, wherein the predetermined area of the model is partitioned by color coding. 4. The apparatus according to claim 1, wherein the predetermined area of the model is defined by a line drawn so as to be superimposed on the model and projected onto the model. 5. How to set structural analysis conditions.

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