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標(biāo)題: Solidworks smulation 設(shè)計(jì)分析自行車車架 [打印本頁(yè)]
作者: 寂靜天花板    時(shí)間: 2015-9-24 19:05
標(biāo)題: Solidworks smulation 設(shè)計(jì)分析自行車車架
Part 1: Frame Geometry Optimization –  Using 3D Sketches, Weldments, and StaticAnalysis to optimize the frame geometry
Part 2: Tube Shape Optimization 1 – UsingSurfacing and Static Analysis to define the shape of the tubes
Part 3: Tube Shape Optimization 2 – UsingCFD analysis to optimize the aerodynamic efficiency of the tube shapes
Part 4: Components and Details – Finishingup the rest of the bike. Because why not?
用3D草圖,、焊件和靜態(tài)算例,，優(yōu)化車架幾何結(jié)構(gòu)，再用CFD分析，從空氣動(dòng)力學(xué)角度優(yōu)化管形狀,。
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上圖吧,。
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When we want to incorporate FEA techniques in ouranalysis, we should consider ways to simplify our model. A bike frame has avery small thickness relative to its surface area. Therefore, we can analyzethe geometry using shells., v# d8 Q( B; ^
In SOLIDWORKS, shells are very easy to set up. With thehelp of the Shell Manager,surfaces can be given a thickness, material, offset type, and more within oneconvenient table.
1 _) X; n" `8 b4 i7 I3 [
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Analysis (computational) times are much lower for shellsthan solid geometry.3 x( d( k3 K' H+ y! o/ V0 o7 o
Furthermore, laminar edges (coincident surfaces) aretreated as bonded, so there is no need to worry about knitting your surfacesbefore starting your analysis.
6 [9 F6 a2 k2 u[attach]365869[/attach]Tapered vs. Non-Tapered Head TubeThere is quite a lot of hype about ‘tapered head tubes’ inthe performance cycling world [where the bottom profile of the head tube tapersout], but how much of a difference does it actually make? To find out, I ran astatic analysis to see if there was any noticeable effect on the frame’sstiffness.( g; R, L1 {. Y* C/ B
The main forces applied to the bike are torsional andlateral forces. Therefore, we can limit our analysis to torsional and lateralstiffness.; B6 c/ j* I3 p+ Z& k" P3 [
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These are simplified definitions for a body with onedegree of freedom. This can be applied to our case by analyzing the resultantdeflection in the direction of the applied force as long as one force isapplied at a time for each analysis.. Y% \0 W9 _0 u/ I# G6 r
First, let’s look at the torsional stiffness. In order tocalculate torsional stiffness (for the Head Tube) we can create a resultantplot of the circumferential deflection about the Head Tube Axis (HT AXIS).9 ~( U) ?5 S& c7 X7 S1 h
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By taking advantage of the extra spaceon the non-drive side, I was able to increase the lateral stiffness of theframe by 11%.
In the next part, I will furtherimprove the performance of the frame design by using CFD (computational fluiddynamics) analysis to optimize for aerodynamic performance.
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Thank you for reading, stay tuned forthe next part!
Summary of results
    
Design Aspect
      
Change In Stiffness (%)
   6 F6 z7 p; @3 l1 H
    
Non-Circular Profile
      
37 (Torsional)
  
6 w# J; G3 w$ L# ~: z& @. `     
Tapered Head Tube
      
21.5 (Torsional)
  
$ }* h; _* X5 ?' P# c: x     
Non-Symmetric Chain Stay
      
11 (Lateral)
  
- S8 G/ X; M' T; N/ I( h% H     
Seat Stay (+/- 1 mm thickness)
      
<<1 (Torsional/Lateral)
  
) [7 q, l5 \3 ?3 ~- x/ T     
Top Tube Taper (1 1/10)
      
3 (Torsional)
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5 K0 |0 _. z6 ?0 d) k" T( w- `! D0 Y, Y
這篇文章給人印象深刻的不是分析,，而是自行車架的3D草圖,。不要抱怨軟件如何如何，還是多檢討自己吧,。
  



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