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...
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...
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...
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()...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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...
