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Analysis and selection of body member sections, Body subframe and underfloor structure

automobile engineering

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Analysis and selection of body member sections, Body subframe and underfloor structure

  1. 1. ( A. D. Patel Institute of technology) Prepared by: Yash A. Lad khambhayta Mayur (130010119047) (130010119042) Analysis and selection of body member sections, Body subframe and underfloor structure
  2. 2. Content  Introduction  Selection of body member section, body subframe and underfloor structure.  Analysis of body member section, body subframe and underfloor structure by using SSS (simple structural surfaces)method.  Simple van structure analysis by SSS method  Literature review  References
  3. 3. Selection of body member section  There are a number of cross-sections are available to be used for the beam elements of the vehicle structure.  The cross-section may be solid or hollow as well as open and closed.  The sections used for the long side and cross members are channel section, box section, I-section, hat section, and tubular section.  The selection of best section is critical since it depends on loading condition.  Section is selected such that the deflection of the beam for a given section area should be minimum.
  4. 4. Subframe  There are generally three basic forms of the subframe. 1) A simple "axle" type which usually carries the lower control arms and steering rack. 2) A perimeter frame which carries the above components but in addition supports the engine. 3) A perimeter frame which carries the above components but in addition supports the engine, transmission and possibly full suspension. (As used on front wheel drive cars)  A subframe is usually made of pressed steel panels that are much thicker than bodyshell panels, which are welded or spot welded together. The use of hydroformed tubes may also be used.  The revolutionary monocoque transverse engined front wheel drive 1959 Austin Mini, that set the template for modern front wheel drive cars, used front and rear subframes to provide accurate road wheel control while using a stiff lightweight body. The 1961 Jaguar E-type or XKE used a tubular spaceframe type front subframe to mount the engine gearbox and long bonnet / hood, to a monocoque 'tub' passenger compartment. The subframe saw regular production in the 1960s and 1970s General Motors X platform and F platform bodies and the 1985-05 M platform vans (Astro, Safari).
  5. 5. Lamborghini_Aventador_LP_700-4_subframe
  6. 6. Underfloor structure  Platform sharing is a product development method where different products and the brand attached share the same components. The purpose with platform sharing is to reduce the cost and have a more efficient product development process. The companies gain on reduced procurement cost by taking advantage of the commonality of the components. However, this also limits their ability to differentiate the products and imposes a risk of losing the tangible uniqueness of the product. The companies have to make a trade-off between reducing their development costs and the degree of differentiation of the products.  A basic definition of a platform in cars, from a technical point of view, includes: underbody and suspensions (with axles) — where the underbody is made of front floor, underfloor, engine compartment and frame (reinforcement of underbody).Key mechanical components that define an automobile platform include: 1) The floorpan, which serves as a foundation for the chassis and other structural and mechanical components 2) Front and rear axles and the distance between them - wheelbase 3) Steering mechanism and type of power steering 4) Type of front and rear suspensions
  7. 7. Underfloor Structure
  8. 8. Analysis  The analysis of body member sections, body subframe and underfloor structure has been done by SSS method.  SSS means Simple Structural Surfaces.  Definition of SSS: A plane structural element (or subassembly) that can be considered as rigid only in its own plane(i.e. flexible to out-of-plane load).
  9. 9. Sr. No. Title Publisher Conclusion Outcome 1 Computational Analysis of a Car Chassis Frame under a Frontal Collision Diogo Montalvão and Magnus Moorea A simulation of the frontal collision of a car frame using non-linear FEA has been presented. Three frontal crash situations were evaluated In this paper, the profile of deformation in the simulations run is comparable to the deformation which is visible in the videos of real tests, even if important components, like the engine, have not been considered in the simulations. 2 DESIGN AND ANALYSIS OF A BUS BODY SIDE FRAME SREENATH S and K KAMALAKKA NNAN The light weight approach for a bus body influences the manufacturing cost, vehicle handling and stability as well as the overall performance. The two methods adopted for the light weight design are by reducing the number of frames elements and supporting frames elements and secondly the topology (thickness, gauges etc.) optimization. 3 Design Modification of Ladder Chassis Frame Mr.Birajdar M. D. and Prof. Mule J.Y. The deflection values calculated are within limit & Reduction in height of span EG is possible up to fourth case Comparison of results revel that as area is decreasing the generated stresses in side member of ladder chassis are increasing but it is within allowable limit of stresses. Literature Review
  10. 10. Sr. No. Title Publisher Conclusion Outcome 4 Modeling And Analysis of An Innova Car Chassis Frame by Varying Cross Section 𝐍.𝐒𝐈𝐕𝐀 𝐍𝐀𝐆𝐀 𝐑𝐀𝐉𝐔, 𝐌.𝐕.𝐇.𝐒 𝐀𝐓𝐇𝐈𝐒𝐇 𝐊𝐔𝐌 𝐀𝐑 and 𝐔.𝐊𝐎𝐓 𝐄𝐒𝐖𝐀𝐑𝐀𝐎𝟑 To observe the all results and to compare the rectangular and c-type cross sectional steel chassis frame from ansys. The rectangular section von mises stress was 68.838N/mm2 and C-section von mises stress was 146.255N/mm2. C-section stress is higher than the rectangular section ,but it is with in the ultimate strength, so it is usable strength. So that the C-type cross section will reduces the weight ,area, production time and as well as manufacturing cost. 5 Modelling, Analysis & Optimization of TATA 2518 TC Truck Chassis Frame using CAE Tools Akash Singh Patel and Atul Srivastava The existing heavy vehicle chassis of TATA 2518 TC is taken for design and analysis for different materials. After analysis a comparison is made between existing structure steel chassis and alloy steel materials in terms of deformation and stresses, to select the best one. Different practices are available for chassis modification. Here suitable changes are made in the design using two standard methods(Boxing optimization technique and Reinforcement Optimization Technique)and the analysis is done to observe the reduction in the stress levels 6 Static Analysis Of Chassis Frame Of Electric Tricycle Amol Badgujar and P.A.Wankhade The result of FE analysis is 7.81 % lesser than the result of analytical calculation. The difference is caused by simplification of model and uncertainties of numerical calculation .Maximum The location of maximum Von Misses stress and maximum shear stress are at bottom of mounting bracket at front of chassis.
  11. 11. Sr. No. Title Publisher Conclusion Outcome 7 Structural Analysis of a Heavy Vehicle Chassis Made of Different Alloys by Different Cross Sections Abhishek ,Mr. Pramod, Abdul and Mohammad Mamoon Khan4 The results shows that for all of the materials that have been tested in this text, AISI 4130 steel alloy shows better performance than all of the other metal alloys. The AISI 4130 alloy is lighter than all of the alloys and on the same side providing the strength as well. 8 Development of a Rapid Design System for Aerial Work Truck Subframe with UG Secondary Development Framework Liu Xinhua, Li Qi, Liu Youhui and Yin Jilin In order to realize the rapid design of aerial work truck subframe, this paper puts forward the wizardbased parametric modeling method and develops the prototype system based on UG development platform and VC 6.0 compile environment. The system can significantly improve the design efficiency of the subframe, shorten the design cycle and provide 3D model for the follow-up simulation analysis. 9 An extruded and welded subframe for sports cars The general motors Plant personnel reported that hydro’s subframe is easier to install than the previous stamped aluminium component. The sub-frame produces more uniform structure and always an asset in the assembly process.
  12. 12. References [1] P. S .Madhu and T. R. Venugopal, “Static Analysis, Design Modification and Modal Analysis of Structural Chassis Frame,” International Journal of Engineering Research and applications. Vol.4, pp.06-10, Issue 5 (Version 3), May2014. [2] H. Patel, K. C. Panchal and C. S. Jadhav, “Structural Analysis of Truck Chassis Frame and Design Optimization for Weigh Reduction,” International Journal of Engineering Advanced Technology (IJEAT), Volume-2, Issue -4, April-2013. [3] K. I. Swami and Prof. S. B. Tuljapure, “Effect of Torque on Ladder Frame Chassis of Eicher 20.16,” Int. Journal of Engineering research and Applications, Volume 4, Issue 2(Version 1), February 2014. [4] J. S. Nagaraju, U. H. Babu, “Design and Structural Analysis of Heavy Vehicle Chassis Frame Made of Composite Material by Varying Reinforcement Angles of layers,” International journal of Advance Engineering research and studies, Vol.1, Issue 2, January-March, 2012. [5] A. Singh, V. Soni, A, Singh, “Structural Analysis of Ladder Chassis for Higher Strength,” International Journal of Emerging Technology and Advanced Engineering, Volume 4, Issue 2, February 2014. [6] Strength of Materials by S. Ramamrutham.