JP6034936B1 - 荷重特性の解析方法及び解析モデル生成装置 - Google Patents
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Abstract
Description
まず、荷重特性を解析する筒状の解析対象物の一例として、車両に備えられるエネルギ吸収部材について説明する。図1は、エネルギ吸収部材1の斜視図である。エネルギ吸収部材1は、例えば、車両のフロントバンパビームとフロントフレームとの間に設けられ、車両が、先行車両や障害物その他の対象物に衝突したときに衝突荷重を受けて圧壊し、衝突エネルギを吸収する。また、エネルギ吸収部材1は、衝突荷重が大きい場合には、衝突荷重をフロントフレームに効率的に伝達する役割も担う。
(2−1.概要)
次に、エネルギ吸収部材1が軸方向に圧壊する際の荷重特性(FS特性)を有限要素法により解析する手法について説明する。図2は、エネルギ吸収部材1の衝突をシミュレーションして荷重特性をコンピュータ解析する手法を示す説明図である。解析モデル10の先端は自由端とされ、後端は固定端とされる。エネルギ吸収部材1の荷重特性は、エネルギ吸収部材1を四角形のメッシュで分割した解析モデル10の先端をインパクタ30に突き当てた状態で、インパクタ30を所定の圧力でエネルギ吸収部材1の軸方向に移動させたときの解析モデル10の変形量(S:mm)と負荷される荷重(F:kN)との関係を示すものである。
荷重特性を有限要素法により解析する際に、一般的なメッシュパターンによれば、エネルギ吸収部材1の軸方向及び軸方向に直交する方向に沿ってメッシュが配列された解析モデルが得られる。図3は、一般的なメッシュパターンにおけるメッシュの配列を示す模式図であり、軸方向A及び軸方向Aに直交する方向に沿ってメッシュが配列されている。
図6は、本実施形態にかかる解析方法で用いる解析モデル10を示す。かかる解析モデル10は、図1に示したエネルギ吸収部材1の解析モデルの例である。かかる解析モデル10では、四角形のメッシュが、荷重入力方向である軸方向Aに対して傾斜して配列されている。図6に示した例では、メッシュは、軸方向Aに対して45°傾斜して配列されている。図7は、解析モデル10のメッシュパターンを示す模式図である。
図8は、メッシュサイズを2.5mmとして、軸方向に対して45°傾斜させてメッシュを配列した解析モデル10を用いた荷重特性の解析結果を示している。なお、かかる解析においては、図4に示した解析のときと同じ解析モデルを使用した。
上記解析結果において、各メッシュにおいて破断が生じるまでの剛性領域において、一般的なメッシュパターンと本実施形態によるメッシュパターンとの間で差異が生じないことについて説明する。
図12は、本実施形態にかかる解析方法により得られたエネルギ吸収部材1の荷重特性の解析結果を示している。かかる解析結果は、メッシュサイズを2.5mmとし、エネルギ吸収部材1の軸方向に対して45°傾斜させてメッシュを配列したメッシュパターンにより図6に示すような解析モデル10を生成して衝突解析を行って得られた結果である。図12中、実線が本実施形態にかかる解析方法により得られた解析結果を示し、破線、二点鎖線、点線が、すべて実際のエネルギ吸収部材1を用いて荷重を測定した結果を示す。
次に、本実施形態にかかる筒状のエネルギ吸収部材1の解析モデル10を生成するための装置の構成例について説明する。図13は、解析モデル生成装置100のハードウェア構成を機能ブロックで示した図である。解析モデル生成装置100は、演算処理装置(CPU)110、一時記憶メモリ112、記憶部114、入力部116、表示部118を備える。
3 テーパ部
10 解析モデル
100 解析モデル生成装置
Claims (7)
- 筒状の解析対象物に対して軸方向に荷重が入力された場合の荷重特性を有限要素法により解析する荷重特性の解析方法であって、
解析モデルのメッシュの配列方向を、前記軸方向に対して傾斜させた解析モデルを生成するステップと、
前記解析モデルの軸方向に荷重を負荷したときに発現する荷重を解析するステップと、を含む、
コンピュータにより行われる荷重特性の解析方法。 - 前記コンピュータは、前記メッシュの配列方向を、前記軸方向に対して45度傾斜させた前記解析モデルを生成する、請求項1に記載の荷重特性の解析方法。
- 前記コンピュータは、前記メッシュが四角形のメッシュである前記解析モデルを生成する、請求項1又は2に記載の荷重特性の解析方法。
- 前記コンピュータは、複数層からなる前記解析対象物を、一つの解析モデルで再現する、請求項1〜3のいずれか1項に記載の荷重特性の解析方法。
- 前記解析モデルは、前記荷重が入力される側の軸方向端部に、当該軸方向端部に向かって外径が小さくなるテーパ部を有する前記解析対象物の解析モデルである、請求項1〜4のいずれか1項に記載の荷重特性の解析方法。
- 前記解析対象物が、炭素繊維強化樹脂製のエネルギ吸収部材である、請求項1〜5のいずれか1項に記載の荷重特性の解析方法。
- 筒状の解析対象物の荷重特性を有限要素法により解析するために前記解析対象物の解析モデルを生成する解析モデル生成装置であって、
前記筒状の解析対象物の軸方向に対して傾斜する方向にメッシュが配列するメッシュパターンにより解析モデルを生成する、解析モデル生成装置。
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DE102016117709.1A DE102016117709A1 (de) | 2015-09-28 | 2016-09-20 | Verfahren zum analysieren einer belastungscharakteristik und vorrichtung zum erzeugen eines analysemodells |
CN201610851373.9A CN106557610A (zh) | 2015-09-28 | 2016-09-26 | 负荷特性的分析方法和分析模型生成装置 |
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JP5164808B2 (ja) * | 2008-11-19 | 2013-03-21 | 株式会社日立製作所 | 解析メッシュ作成装置 |
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US20170089780A1 (en) | 2017-03-30 |
CN106557610A (zh) | 2017-04-05 |
DE102016117709A1 (de) | 2017-03-30 |
US10378981B2 (en) | 2019-08-13 |
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