Thank you so much, I will follow this book and watch all the videos in this series, and I hope you will release more videos, they really help me! Liked! Subscribed!
محاضرة ممتازة بكل ما تحتويه .. لقد مر وقت طويل على مراجعتي لهذه المفاهيم ,, اشكرك كثيراً على ذلك وعليه يبدو ان علي الكثير من الوجبات بمتابعة كافة الفيديوهات التي قمت بنشرها في قناتك ,, سوف اقوم بمشاهدتها جميعا وانصح الجميع بها شكرا كثير دكتور
يا أهلا وسهلا، أسعدني مرورك، شيء رائع إنه الفيديو ساعدك في استرجاع تلك المفاهيم، أرحب بك كمتابع في القناة، وأتمنى منك - لو أمكن - نشر القناة واقتراحها على زملائك، العفو، دائما في الخدمة،
This lecture is greatly appreciated. I think the spring example question from Daryl L Logan is a trick question meant to test understanding rather than memory.😂 The numbering of the nodes posed a challenge to your viewers . Your approach is right but I seemed to rush to think that the diagonal terms in the stiffness matrix should read as k1, k1+k2, k2+k3, k3+ k4 etc with the both immediate off diagonals terms as -k2, -k3, -k4 etc with all other terms as zero. This is what I knew until Daryl L Logan decided to mess up with the numbering of the nodes. 😤 This course reminds me of my hard times in the past about the modal analysis and the assembly of the global stiffness matrix of a MDOF system and the subsequent decoupling of the MDOF system into “N” number of SDOF system. I love the example calculation at the tail end of the lecture. It was really helpful and doubt clearing. Following you closely. Thank you Stay blesssed CEE
Hi there Engr. Nii, I know it might be a boring lecture (The next lecture will still investigate more ideas for springs), but it is necessary for further understanding of other chapters. I guess this node numbering might be exactly what you saw, a nice little trick. Ohhhh I love modal analysis. I will actually start my dynamics analysis series once I finish the finite element series (or when I am sufficiently progressed in it). You are gonna love that for sure, as my PhD is about Structural Analysis with emphasis on dynamics and FEM. Thnx again for your great insights. Stay tuned for more content, MJ
Hello Dr CEE, Thank you for your patience In the first introductory lecture, there was Step 2 (Displacement function) and Step 3 (strain/displacement and stress/strain relationships). I can see step 1, step 4, 5, 6, and 7 in this current lecture but I don’t really see steps 2 and 3 for the spring element that have been used in the current lecture. What is the expression for the “displacement function” of the spring element in this lecture? What are the expressions for step 3 for the spring element used in this lecture? Regards, DK
Hi there Engr. DK, you have a sharp mind. I was expecting this to be noted by you. The reason why there are steps being overjumped is because there is a direct connection between displacement and force. Remember, the mission objective is to connect the displacement of the ends of the member to the forces developed inside the members, now for a spring, it is a direct F = kx Example where it is NOT direct is an axial bar "truss member" Here you would do the following quick calculation stress = E * strain linear displacement strain = displacement / length force = stress* A so: F = AE/L delta so for an axial bar, k = AE/L ^_^ and this is a quick sumary of lecture 4 (not 3, as 3 will explore more examples on springs) So basically, your questions is a trailer for Lecture 4 ^_^ Stay tuned for more content, CEE
@@CivilEngineeringEssentials Thank you for the feedback and for the compliment 😊. Yep, you are right, I do need to always remember the “mission objective” of these steps. Ooh, the axial bar neatly makes use of step 3 to reach the mission objective; the flow from stress/strain, strain/displacement, and force/stress to -> force/displacement and subsequently the axial bar stiffness k=AE/L in the example was very neat and I appreciate it. I suppose that the required steps and the level of details needed shall progress as other element types and configurations get considered. Keep up the good work (as you always do) and I’ll “see” you in the next videos. Regards, DK
Dear Dr. CEE: This is an excellent initiative and splendid effort. Hats off to you for providing such valuable insights. One query, is it possible to please share these PPT slides? Thank you very much
Hello there, As far as I know, the most famous BCs are the Dirichlet and Neumann BC. (Especially when we are dealing with structural dynamics) If you want to consider Robin BC as just a simple combination of providing function values and derivatives together, then a structural dynamics problem is your best bet. You would need to provide the displacement, velocity and acceleration of all degrees of freedom at time t = t0. As for the Robin BC (which I know to be the Fourier type BC), I have not seen it used in a regular FEA structural analysis before. It might be used when there is some special requirements that need a flux and value to be defined (heat flux and heat values in a blast furnace for example), but I have little experience in those (both in my own research as an academic, or past experience as an engineer), so I am unable to provide further detail about it. What I would imagine is that such a problem would include the calculation of displacements and stresses that conform with the provided dirichlet + neumann (value and flux) of heat given. This would mean that the material used has a heat transfer that is dependent on its strain and displacement. It is really spinning my head so I am not. Hope it helped, CEE
شكرا لك كثيرا على هذه السلسلة المفيدة جدا...بارك الله في علمك لو كان بإمكانك ان نقوم بعملية برمجة لما نقوم بتعلمه في هذه السلسلة...و انشاء برامجنا الخاصة للعناصر المحدودة اتمنى لو يكون هنالك سلسلة خاصة بالبرمجة... شكراً لك
هو موجود سلسلة بالخصوص، لكنها على udemy من طرفي أول ما أخلص من سلسلة الجسور، وكذلك سلسلة التحليل الإنشائي اللاخطي، وسلسلة المبنى، ممكن أفكر أعمل شيء باستخدام python لأنه الموجود في udemy هو باستخدام c# فيعني، بدها شوية صبر، ويسعد أوقاتكم وبالتوفيق.
أنا بدأت مؤخرا بالغوص في قناتك و أنا أهنئك فعلا على ما تقوم به و ما تقدمه من معلومات بطريقة جميلة و مقبولة لكل المستويات...و اتمنى لو انني رأيت هذه المحتوى سابقاً التحليل اللاخطي هو هدفي القادم بعد الانتهاء من الروبوت..شكرا جزيلا لك و اتمنى أن تبدأ قريبا في سلسلة PYTHON انه أمر مفيد جداا و رائع @@CivilEngineeringEssentials
يا أهلا وسهلا، يشرفني ويسعدني الأمر هذا، حاضر، تم، أول ما يصير متسع من وقت أدخل في ال python ، خصوصا لأنه Open source فيعني متاح، بدل الماتلاب واللي بآلاف الدولارات. على كلا، يسعدني متابعتك، ولو تكرمت واستطعت نشر القناة أكونلك من الشاكرين. بالتوفيق.
بالتأكيد هذا واجب علي ان اقوم بنشر قناتك و اخبر جميع اصدقائي عنها..شكرا جزيلا لك.. اتمنى لو كنت استطيع التواصل مع حضرتك على Whatsapp اذا كان هذا الأمر متاح لك..شكرا جزيلا مرة أخرى @@CivilEngineeringEssentials
شكرًا
العفو،
thank you very much for supporting the channel
I wish you all the best,
CEE
Thank you so much, I will follow this book and watch all the videos in this series, and I hope you will release more videos, they really help me! Liked! Subscribed!
Excellent lecture with all it contains. Thanks a lot
محاضرة ممتازة بكل ما تحتويه ..
لقد مر وقت طويل على مراجعتي لهذه المفاهيم ,, اشكرك كثيراً على ذلك
وعليه يبدو ان علي الكثير من الوجبات بمتابعة كافة الفيديوهات التي قمت بنشرها في قناتك ,, سوف اقوم بمشاهدتها جميعا وانصح الجميع بها
شكرا كثير دكتور
يا أهلا وسهلا،
أسعدني مرورك، شيء رائع إنه الفيديو ساعدك في استرجاع تلك المفاهيم،
أرحب بك كمتابع في القناة، وأتمنى منك - لو أمكن - نشر القناة واقتراحها على زملائك،
العفو، دائما في الخدمة،
This lecture is greatly appreciated.
I think the spring example question from Daryl L Logan is a trick question meant to test understanding rather than memory.😂
The numbering of the nodes posed a challenge to your viewers . Your approach is right but I seemed to rush to think that the diagonal terms in the stiffness matrix should read as k1, k1+k2, k2+k3, k3+ k4 etc with the both immediate off diagonals terms as -k2, -k3, -k4 etc with all other terms as zero.
This is what I knew until Daryl L Logan decided to mess up with the numbering of the nodes. 😤
This course reminds me of my hard times in the past about the modal analysis and the assembly of the global stiffness matrix of a MDOF system and the subsequent decoupling of the MDOF system into “N” number of SDOF system.
I love the example calculation at the tail end of the lecture. It was really helpful and doubt clearing.
Following you closely.
Thank you
Stay blesssed CEE
Hi there Engr. Nii,
I know it might be a boring lecture (The next lecture will still investigate more ideas for springs), but it is necessary for further understanding of other chapters.
I guess this node numbering might be exactly what you saw, a nice little trick.
Ohhhh I love modal analysis. I will actually start my dynamics analysis series once I finish the finite element series (or when I am sufficiently progressed in it). You are gonna love that for sure, as my PhD is about Structural Analysis with emphasis on dynamics and FEM.
Thnx again for your great insights.
Stay tuned for more content,
MJ
Thank you for your great effort in your teaching skill. You have energized me to seek learning again.
You are most welcome. If possible, plz share the channel with your friends. It helps a lot.
Regards,
CEE
Hello Dr CEE,
Thank you for your patience
In the first introductory lecture, there was Step 2 (Displacement function) and Step 3 (strain/displacement and stress/strain relationships).
I can see step 1, step 4, 5, 6, and 7 in this current lecture but I don’t really see steps 2 and 3 for the spring element that have been used in the current lecture.
What is the expression for the “displacement function” of the spring element in this lecture? What are the expressions for step 3 for the spring element used in this lecture?
Regards, DK
Hi there Engr. DK,
you have a sharp mind. I was expecting this to be noted by you.
The reason why there are steps being overjumped is because there is a direct connection between displacement and force.
Remember, the mission objective is to connect the displacement of the ends of the member to the forces developed inside the members, now for a spring, it is a direct
F = kx
Example where it is NOT direct is an axial bar "truss member"
Here you would do the following quick calculation
stress = E * strain
linear displacement
strain = displacement / length
force = stress* A
so:
F = AE/L delta
so for an axial bar, k = AE/L ^_^ and this is a quick sumary of lecture 4 (not 3, as 3 will explore more examples on springs)
So basically, your questions is a trailer for Lecture 4 ^_^
Stay tuned for more content,
CEE
@@CivilEngineeringEssentials
Thank you for the feedback and for the compliment 😊. Yep, you are right, I do need to always remember the “mission objective” of these steps.
Ooh, the axial bar neatly makes use of step 3 to reach the mission objective; the flow from stress/strain, strain/displacement, and force/stress to -> force/displacement and subsequently the axial bar stiffness k=AE/L in the example was very neat and I appreciate it.
I suppose that the required steps and the level of details needed shall progress as other element types and configurations get considered.
Keep up the good work (as you always do) and I’ll “see” you in the next videos.
Regards, DK
Thanks for real science doctor!
Most welcome ^_^
Your videos are always on point.,Can you please do a whole structure in RSA now..Thank you so much
Yes. I am preparing a steel structure as we speak. The RC structure will follow after it.
Thanks, That was a detailed explanation ... GJ!🌷
Hi there, Happy it helped ^_^ Stay tuned for more content like this.
Regards,
CEE
You are a good man
Most welcome, stay tuned for more content like this.
Dear Dr. CEE: This is an excellent initiative and splendid effort. Hats off to you for providing such valuable insights. One query, is it possible to please share these PPT slides? Thank you very much
Great Video.
May I suggest a push over analysis of a multi-storey frame. 2D frame, say 5 storeys high
Sure thing. You mean in the robot series or in the lecture series?
Regards,
CEE
@@CivilEngineeringEssentials Correct. In Robot. Will love to see how you do it. Your explanations are superb
Do Robin boundry condition ever appear or required in fea? If yes can kindly explain type of problem or forces on structure . Thank you
Hello there,
As far as I know, the most famous BCs are the Dirichlet and Neumann BC. (Especially when we are dealing with structural dynamics)
If you want to consider Robin BC as just a simple combination of providing function values and derivatives together, then a structural dynamics problem is your best bet. You would need to provide the displacement, velocity and acceleration of all degrees of freedom at time t = t0.
As for the Robin BC (which I know to be the Fourier type BC), I have not seen it used in a regular FEA structural analysis before.
It might be used when there is some special requirements that need a flux and value to be defined (heat flux and heat values in a blast furnace for example), but I have little experience in those (both in my own research as an academic, or past experience as an engineer), so I am unable to provide further detail about it.
What I would imagine is that such a problem would include the calculation of displacements and stresses that conform with the provided dirichlet + neumann (value and flux) of heat given. This would mean that the material used has a heat transfer that is dependent on its strain and displacement. It is really spinning my head so I am not.
Hope it helped,
CEE
@@CivilEngineeringEssentials thank you good explanation..
شكرا لك كثيرا على هذه السلسلة المفيدة جدا...بارك الله في علمك
لو كان بإمكانك ان نقوم بعملية برمجة لما نقوم بتعلمه في هذه السلسلة...و انشاء برامجنا الخاصة للعناصر المحدودة
اتمنى لو يكون هنالك سلسلة خاصة بالبرمجة... شكراً لك
هو موجود سلسلة بالخصوص، لكنها على
udemy
من طرفي أول ما أخلص من سلسلة الجسور،
وكذلك سلسلة التحليل الإنشائي اللاخطي،
وسلسلة المبنى،
ممكن أفكر أعمل شيء باستخدام
python
لأنه الموجود في udemy
هو باستخدام c#
فيعني، بدها شوية صبر،
ويسعد أوقاتكم وبالتوفيق.
أنا بدأت مؤخرا بالغوص في قناتك و أنا أهنئك فعلا على ما تقوم به و ما تقدمه من معلومات بطريقة جميلة و مقبولة لكل المستويات...و اتمنى لو انني رأيت هذه المحتوى سابقاً
التحليل اللاخطي هو هدفي القادم بعد الانتهاء من الروبوت..شكرا جزيلا لك
و اتمنى أن تبدأ قريبا في سلسلة PYTHON انه أمر مفيد جداا و رائع
@@CivilEngineeringEssentials
يا أهلا وسهلا، يشرفني ويسعدني الأمر هذا،
حاضر، تم، أول ما يصير متسع من وقت أدخل في ال
python
، خصوصا لأنه
Open source
فيعني متاح، بدل الماتلاب واللي بآلاف الدولارات.
على كلا، يسعدني متابعتك، ولو تكرمت واستطعت نشر القناة أكونلك من الشاكرين.
بالتوفيق.
بالتأكيد هذا واجب علي ان اقوم بنشر قناتك و اخبر جميع اصدقائي عنها..شكرا جزيلا لك..
اتمنى لو كنت استطيع التواصل مع حضرتك على Whatsapp اذا كان هذا الأمر متاح لك..شكرا جزيلا مرة أخرى @@CivilEngineeringEssentials
28:26
Hi there. Sure if there is any problem or question, feel free to ask.
Regards
CEE
@@CivilEngineeringEssentials No problem, I'm just time stamping it
Oh, great to know ^_^
Wow!! ❤