ワイヤーによる引っ張りをシミュレーションする方法

Anonymous

ワイヤーによる引っ張りをシミュレーションする方法

Anonymous
適用対象外

@adachitech7 

足立さんのこの部分が貫通していると思いました。ここはどのようになっているのでしょうか?

何度も申し訳ありません。

スクリーンショット 2021-02-03 082700.png

 

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hide-wada
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@Anonymousさんへ おはようございます。

 

デザインに戻り、ワイヤー1或いは、ワイヤー2をアクティブにすると、形状が判ります。

これで見ると、ワイヤーは、貫通していないで、Lアングルの形状に合わせてカットしてありますね。

 

写真が貼り付けられないようなので、添付させて頂きます。

 

 

Hidetoshi Wada
Mechanical designer

EESignature

adachitech7
Consultant
Consultant

@Anonymous さん、

 

Fusion360で3Dモデルの構造を確認する方法として「干渉チェック」機能と「断面解析」機能をご紹介します。

どちらも設計する上では非常に便利な機能ですので一度使ってみてください。

 

Anonymous
適用対象外

ありがとうございます。理解出来ました。

私の伝え方が下手で申し訳なかったです。

図のようにトラスをワイヤーで引っ張ると中心部が上に上がる揚力を解析したいのですが、この方法でトラスを複数つないだ場合は解析できるのでしょうか?

少しニュアンスが異なるのかと思います。絵が下手ですみません。

 

PXL_20210203_024026645.jpg

 

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adachitech7
Consultant
Consultant

複数のトラスであっても理屈は一緒なので解析できると思います。

 

Anonymous
適用対象外

すみません。昨日から何度もやり直しをしてやっているのですが、エラーが消えず、シミュレーションが出来ません。
お助け願います。

 

エラーは次の通りです。

エラー: STIFFNESS MATRIX SINGULAR OR NON-POSITIVE DEFINITE
Cause : A singularity or non-positive definite has been detected in the stiffness matrix during the
preconditioning phase of the iterative solver.
Action : Investigate the model for a lack of constraint. If using shell elements, either set the
K6ROT model parameter to a value between 1.0 and 100.0, or set the SHELLRNODE model
parameter to ON. Also, check for elements with bending stiffness (line and shell
elements) improperly connected to elements without (solids). If you are unable to
locate the source of the singularity, consider using the sparse direct solver.

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adachitech7
Consultant
Consultant

@Anonymous さん、

 

まだ2か所干渉しているところがありますので、これを解消してから再度トライしてみてください。

干渉チェックの方法や修正の仕方が分からなければまた聞いてください。

01.PNG02.PNG

Anonymous
適用対象外

干渉は有りませんとなったのですが、エラーが出ます。

なぜなのでしょうか?

内容はこちらです。

 

エラー: STIFFNESS MATRIX SINGULAR OR NON-POSITIVE DEFINITE
Cause : A singularity or non-positive definite has been detected in the stiffness matrix during the
preconditioning phase of the iterative solver.
Action : Investigate the model for a lack of constraint. If using shell elements, either set the
K6ROT model parameter to a value between 1.0 and 100.0, or set the SHELLRNODE model
parameter to ON. Also, check for elements with bending stiffness (line and shell
elements) improperly connected to elements without (solids). If you are unable to
locate the source of the singularity, consider using the sparse direct solver.

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adachitech7
Consultant
Consultant

@Anonymous さん、

 

摩擦なし固定を付けている2か所の内、片方を完全固定してみました。

これで計算自体は上手くできるようです。

01.PNG

 

Anonymous
適用対象外

おはようございます。

試してみたのですが、やはりエラーが出ます。エラーの内容はこちらです。

エラー: STIFFNESS MATRIX SINGULAR OR NON-POSITIVE DEFINITE
Cause : A singularity or non-positive definite has been detected in the stiffness matrix during the
preconditioning phase of the iterative solver.
Action : Investigate the model for a lack of constraint. If using shell elements, either set the
K6ROT model parameter to a value between 1.0 and 100.0, or set the SHELLRNODE model
parameter to ON. Also, check for elements with bending stiffness (line and shell
elements) improperly connected to elements without (solids). If you are unable to
locate the source of the singularity, consider using the sparse direct solver.

 

どうようのエラーだと思います。

 

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adachitech7
Consultant
Consultant

@Anonymous さん、

 

私の環境では上手く計算できています。ということはどこかに違いがあるはずです。エラーメッセージは同じ文言のようですので問題点を突き止めるには他の情報が必要になります。データを添付いただくか解析条件設定の詳細を開示していただくかすると検証することが可能です。上手くいかなかったという情報だけではなかなか前に進みませんのでできる限り情報をお寄せください。また解析自体をクラウドで行っているのかローカルで行っているのかによっても状況が変わってくるかもしれませんのでそのあたりも合わせて教えてください。それから今トライされているモデルはかなり詳細に作りこまれたものですのでそのあたりに起因する何かがあるかもしれません。解析メニューの中に「単純化」機能もありますので、この機能を使ってもっとシンプルなモデルに変更して同じエラーが出るかを確認するのも一つの手になります。私がよくやるアプローチではまずできる限り簡素化した3Dモデルを作り解析条件を詰め、きちんと計算が実行されそれらしい答えがでるかを事前に検証しています。いわゆる予備解析というものになります。このアプローチをとるとソルバー自体の問題と3Dモデル自体の問題を切り分けることができます。ひと手間増えて面倒な感じはしますが、事前に十分に準備した方が結局は時間の節約になります。よろしくご検討ください。

adachitech7
Consultant
Consultant

@Anonymous さん、

 

今気づいたのですが、中央部のワイヤー端面が相手側と接触していないことになっていますね。なぜだか自動接触定義がうまくできていないようです。接触は手動でも定義できますので一度トライしてみてください。私の方でもこれで再度計算してみます。

画像貼り付けが上手くできないので添付しておきます。

 

Anonymous
適用対象外

ありがとうございます。
ただ、トラスの検証になるので、トラスを無くすことは出来ないのです。
データは以前添付したものと同じで、拘束条件を変更したものです。

検証は中心付近にある四角の部分2つに464.52Nを荷重として載せています。

重力はオンです。ワイヤーに当たる部分は30㎜をオフセット接着。

検証はクラウドです。

単純化は勉強してみます。

色々と申し訳ないです。スクリーンショット 2021-02-05 100041.pngスクリーンショット 2021-02-05 100134.pngスクリーンショット 2021-02-05 100225.png

 

 

Anonymous
適用対象外

ありがとうございます。
早速試しています。

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adachitech7
Consultant
Consultant

@Anonymous さん、

 

データの添付ありがとうございます。

 

拘束設定はこれで問題ないようです。

先ほどの投稿でもお知らせしましたが、ワイヤー中央部の接触定義ができていないようです。

これを手動で追加してトライしてみてください。

01.PNG

 

 

予備解析の目的は解析条件の設定にありますから、出てくる数値が現実のものと違っていてもさほど問題にはなりません。

今回の場合でも極端な話、中身をくり抜いた「四角い箱」でもある程度までは条件を詰めることが可能です。エラーを吐かずにきちんと最後まで計算が実行されるかどうか、これを確認することを予備解析でのゴールにしたらいいと思います。

参考までに。

Anonymous
適用対象外

ありがとうございます。
予備解析とはそういう意味を言うのですね。
今回改めてすごく勉強になりました。

まだ初めて最初の案件でこれの上に1週間なので分からないことが全てと言っても過言ではない状況なので、少しずつ勉強して慣れていきたいと思います。

ありがとうございます。

Anonymous
適用対象外

無事解析出来ました。
しかし、新たな問題がおきまして、現実的に持たないことは分かったうえでの解析なのですが、ワイヤーがたるんでしまうのです。これはどういうことなのでしょうか?スクリーンショット 2021-02-05 104936.pngスクリーンショット 2021-02-05 105001.pngスクリーンショット 2021-02-05 105037.png

adachitech7
Consultant
Consultant

@Anonymous さん

 

重力の影響をオフにしてみると数値は別にして変形の状態はまともな感じになりました。

01.PNG

 

重力オンにするとなぜダメなのかはもう少し検証してみます。

 

今回のモデルでもクラウドに投げると結果が返ってくるまでに十数分かかっていると思います。

解析条件を決めるためにシンプルな形で予備解析を行ってみることの有効性を今回の事例をとってみても実感していただけるかと思います。

adachitech7
Consultant
Consultant

@Anonymous さん、

 

ひとまずトラス構造をシンプルにし、ワイヤーの分割もせず、荷重もかけずに重力のみオンにして解析してみました。

Fusion360では解析結果を表示する時にはデフォルトで「調整」が選ばれていて分かりやすいように変位の大きさを調整するようになっています。これは「変形」メニューから変えることができますので、まずは実際の変位がどういう感じになるか確認されてはどうでしょうか。

今回私がやった事例ではトラスの変位に比べてワイヤーの変位の方が大きいようです。ですのでワイヤーが垂れ下がること自体は特におかしいことはないのかなと思っています。

引き続き検証してみます。

 

adachitech7
Consultant
Consultant

@Anonymous さん、

 

つづいてワイヤーを切断してみました。しかしオフセット接着を付加しているので変位の数値自体は切断前とほぼ一緒になっています。

02.png

 

 

次に中央部に500Nの荷重をかけてみました。

トラス、ワイヤー共、変位が大きくなっています。

03.PNG

 

 

次にトラスの剛性を上げてみました。

04.PNG

 

 

これらの結果からすると、ワイヤーは自重でこれぐらいは下がる、と言っていいのではないかと思います。

ご参考までに。

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We use LinkedIn to deploy digital advertising on sites supported by LinkedIn. Ads are based on both LinkedIn data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that LinkedIn has collected from you. We use the data that we provide to LinkedIn to better customize your digital advertising experience and present you with more relevant ads. LinkedIn Privacy Policy
Yahoo! Japan
We use Yahoo! Japan to deploy digital advertising on sites supported by Yahoo! Japan. Ads are based on both Yahoo! Japan data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Yahoo! Japan has collected from you. We use the data that we provide to Yahoo! Japan to better customize your digital advertising experience and present you with more relevant ads. Yahoo! Japan Privacy Policy
Naver
We use Naver to deploy digital advertising on sites supported by Naver. Ads are based on both Naver data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Naver has collected from you. We use the data that we provide to Naver to better customize your digital advertising experience and present you with more relevant ads. Naver Privacy Policy
Quantcast
We use Quantcast to deploy digital advertising on sites supported by Quantcast. Ads are based on both Quantcast data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Quantcast has collected from you. We use the data that we provide to Quantcast to better customize your digital advertising experience and present you with more relevant ads. Quantcast Privacy Policy
Call Tracking
We use Call Tracking to provide customized phone numbers for our campaigns. This gives you faster access to our agents and helps us more accurately evaluate our performance. We may collect data about your behavior on our sites based on the phone number provided. Call Tracking Privacy Policy
Wunderkind
We use Wunderkind to deploy digital advertising on sites supported by Wunderkind. Ads are based on both Wunderkind data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Wunderkind has collected from you. We use the data that we provide to Wunderkind to better customize your digital advertising experience and present you with more relevant ads. Wunderkind Privacy Policy
ADC Media
We use ADC Media to deploy digital advertising on sites supported by ADC Media. Ads are based on both ADC Media data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that ADC Media has collected from you. We use the data that we provide to ADC Media to better customize your digital advertising experience and present you with more relevant ads. ADC Media Privacy Policy
AgrantSEM
We use AgrantSEM to deploy digital advertising on sites supported by AgrantSEM. Ads are based on both AgrantSEM data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that AgrantSEM has collected from you. We use the data that we provide to AgrantSEM to better customize your digital advertising experience and present you with more relevant ads. AgrantSEM Privacy Policy
Bidtellect
We use Bidtellect to deploy digital advertising on sites supported by Bidtellect. Ads are based on both Bidtellect data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bidtellect has collected from you. We use the data that we provide to Bidtellect to better customize your digital advertising experience and present you with more relevant ads. Bidtellect Privacy Policy
Bing
We use Bing to deploy digital advertising on sites supported by Bing. Ads are based on both Bing data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bing has collected from you. We use the data that we provide to Bing to better customize your digital advertising experience and present you with more relevant ads. Bing Privacy Policy
G2Crowd
We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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