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  1. elogesh

    Deceleration levels of vehicle during uphill/downhill braking

    In the past, we did virtual simulation of vehicle on plain roads. It involves standard set of static load cases along vertical direction (Bump/Rebound), longitudinal (Braking/acceleration) + self weight, Lateral (cornering) + self-weight,pot-holes,etc for strength assessment of structural...
  2. elogesh

    Deceleration levels of vehicle during uphill/downhill braking

    Hi, During downhill braking/uphill braking, as per the mathematical calculation, depending upon the slope angle, the deceleration will decrease of increase as sin(theta) component of vehicle weight. Is there a mechanism which will ensure the max. deceleration level of vehicle in...
  3. elogesh

    Transient response equations from modal superposition method

    Dear All, Can you share or point out the reference for the equations involved in the calculation of transient response from mode co-efficients. Is there any correspondence between the modal participation factors listed from modal analysis to the mode co-efficients from transient response...
  4. elogesh

    Fit line within the chart using Excel-VBA

    hi, I have the following data in sheet1 from A1 to B10 0 0 100 100 200 100 300 100 400 100 500 100 600 100 700 100 800 100 900 100 Used the following code to plot horizontal line in the chart1. But unable to fit the line within the chart. Option Explicit Sub Macro1()...
  5. elogesh

    Bolted connection joints - Pretension element

    Dear all, Pl. find the APDL code pasted below. The query is how to extract bolt deformation in structural analysis of joint members with bolted connection, which includes pre-tension elements and contact. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!To calculate bolt joint...
  6. elogesh

    Bolted connection joints - Pretension element

    Dear All, Along with this posted an attachment of APDL code to study the bolt joint stiffness ratio for simple two plate model. But the joint stiffness ratio is affected by contact interface stiffness (FKN, Normal penalty stiffness). The output from this execution writes an output file...
  7. elogesh

    Bolted connection joints - Pretension element

    Hi, In one of the analysis requirement represented bolted connections between joint members using Prets179 with contact. Beam 188 elements used for bolt connection. Bolt preload applied as the first load step and axial load applied as second load step. Bolt diameter =12 mm; Bolt pre-load...
  8. elogesh

    Fluid mass accounting in structural analysis

    Dear Experts, We are interested in calculating the modal frequency automotive oil sump filled with oil for fixed boundary condition at the bolted face with engine block.Our concern is about the representation of oil. How oil mass needs to be accounted. 1) whether we can represent oil as NSM...
  9. elogesh

    Natural frequency of frame structure with general mass sitiffness and viscous dumpinig (M DOF)

    Hi aouiche, Greg response is absolutely correct. Effect of damping on natural frequency(C won't matter) on practical structures is almost negligible.... damped natural frequency = undamped natural frequency* sqrt (1- damping ratio^2) Think twice before commenting on others response...
  10. elogesh

    Draw graph/shape from excel-VBA

    Hi, Thanks for your comments. I am currently exploring with XY(scatter)chart. elogesh
  11. elogesh

    Draw graph/shape from excel-VBA

    Hi Doug, Big Thanks. The code is compact and made the plotting much more simple. I am still learning to understand the code being a beginner. I edited the code for additional requirements. Apart from vertical lines, would like to draw horizontal lines. Basically, I am drawing commercial...
  12. elogesh

    Draw graph/shape from excel-VBA

    Hi, I am begineer in Excel-VBA. Need help to plot graph. I have two set of data points (A,B) and (D,E) corresponding can also be mentioned as column (1,2) and (4,5)starting from row no.6 to row no.13 A B 0 50 1000 50 2000 50 3000 50 4000 50 5000 50 6000 50 7000 50 8000 50 C D...
  13. elogesh

    Performing Modal assurance criterion to get MAC number

    Hi, Regarding the MAC correlation, these are the recommended steps, 1) Pre-test: Perform FE Analysis. Extract the modes up to desired frequency range. Determine the optimum and best accelerometer location and excitor (Impact hammer/Shaker) locations, which will capture all the modes.These...
  14. elogesh

    Relation between mass, stiffness and Damping

    Every component has three inherent (Mass, stiffness, damping) in them. If you take a steel wire, it has more axial stiffness and low mass. If you attach steel ball at the end of the wire. The steel ball has more mass and rigid(High stiffness). Compared to the steel ball, the mass of the wire...
  15. elogesh

    Software for test-analysis correlation

    Hi, Would recommend LMS virtual lab correlation module. It has three sub-modules 1) pre-test : To recommend better accelerometer/excitation locations based on the FE data 2) Correlation: Comparison of Test and FE results in terms of MAC/FRAC 3) sensitivity analysis and model refinement...
  16. elogesh

    CG & moment of inertia - W.r.to co-ordiante transformation

    Dear all, In a automotive vehicle, we got the CG as well moment of inertia of the power train(engine+clutch+gearbox..) about the vehicle co-ordinate system with zero degree of rotation.When the engine is fitted into the vehicle the engine is rotated -3 deg for connecting the propeller shaft...
  17. elogesh

    problem with DBALL file

    When you issue nastran solve, enter scr=n in the optional keywords... This indicates deletion of scratch files *.master & *.dball at the end of the analysis.
  18. elogesh

    Power train mount - Modal kinetic energy calculation

    Hi, would like to calculate the modal kinetic energy of Power train mount suspension modes based on FEA modal results. Power train System built as 6-dof model and hence there are totally 6 modes (Bounce, lateral, longitudinal, roll, yaw,pitch). 80% participation of individual modes ensures...
  19. elogesh

    FE analysis of steel bellows

    Hi, Thanks for your response. The mesh model is included as an attachment. I will be re-running the analysis with large deformation effects included and also will share the results. The bellow needs to be analyzed for axial and bending loads. For axial loads it needs to withstand half a...
  20. elogesh

    FE analysis of steel bellows

    Hi, I am analyzing steel bellows made of SS-304 stainless steel material subjected to axial displacement +/-12mm has to withstand 0.5 million cycles. Endurance strength of the material for infinite life is approx. 160 MPa. Stress from the linear static analysis for axial load is around 400...

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