Hello I found some example lines that appear to define the location of a pushrod. PushrodSpindle=(-0.080,-0.15, 0.000) PushrodOutboard=(0.9:fl_spindle0.02500000000000002,-0.135,-0.01599999999999855),0.06:front_subbody0.195,-0.14,-0.7892),0.04:front_subbody0.195,-0.134,-0.5391999999999999),offset=0) PushrodBody=( -0.264, 0.195, 0.000) I am curious as to how to interpret the reading of this material? A)) "Pushrod spindle=": ? what does "PushrodSpindle=" mean relative to "PushrodOutboard=" vs. "PushrodBody=" B)) I interpret "Pushrod outboard =": defines the location of the outboard pushrod location as 90% of each value in fl_spindle(CO-ORDINATES SHOWN BETWEEN THE BRACKETS) + 6% of each value in front_subbody(CO-ORDINATES SHOWN BETWEEN THE BRACKETS) + 4% of each value in front_subbody(CO-ORDINATES SHOWN BETWEEN THE BRACKETS) with like co-ordinates added together? At the end of the line is an additional argument "Offset=0". Obviously "0" means the argument has no effect. If for example the "offset=" value does not equal zero what does this argument mean to the "PushrodOutboard =" location string? How is the offset value applied to the "PushrodOutboard=" location C)) "PushrodBody=" : location of the pushrod connection to the body? D)) When "PhysicalModelFile=" appears with "UltraChassis=" in the [SUPENSION] section of the HDV, how does one know which file is being used for what? Does the order in which the files are presented have an impact on how they are applied? Appreciate any clarification that might help to understand this input? Thanks
From the Rhez 2005 HDV: PushrodBody and PushrodSpindle are the locations of the pickup points relative to the wheel center. PushrodOutboard is used with Ultra Chassis. I believe the entry controls distribution of forces 90% to spindle, 6% to sub body, 4% to sub body). When we got UltraChassis, there was something about those type of entries in the patchnotes, I'll see if I can dig up a reference.
@smbrm: maybe it helps, if you download the latest Version of the Suspensiongenerator spreadsheet. With that, the chassis.ini file and also the entries for the pushrods can be generated. Get it HERE Or visit the rF2 DevCorner for more helpful things.
What vehicle are those HDV entries quoted from? ***Edit*** Found the reference: http://rfactor.net/web/rf2/devscorner/introduction-to-physics-tool-ptool-and-flexible-chassis/
Thanks all for the replies. Those particular HDV entries are not from anywhere in particular, values were notional to illustrate the question. You could equally just look at the BT20 which can then be linked to the 0.70 spreadsheet. From the BT20 HDV: PushrodOutboard=(0.817851:FL_SPINDLE0.00258,-0.098085,-0.014),0.106715:FRONT_SUBBODY0.31015,0.1365,-0.78918),0.075434:FRONT_SUBBODY0.31715,0.1352,-0.46418),Offset=-0.009592) PushrodInboard=(1:Front_Subbody0.368,0.3592,-0.5242)) These appear to be the only info(HDV,susp.pm, ultra chassis.ini) defining the location of the pushrod. They also appear to relate to potentially defining the spring and damper motion ratio in the 0.70 spreadsheet: tab Susp. The point is that in the spreadsheet under the susp tab, there are entries for pushrod outboard c12 to E12 and pushrod inboard c13 to E13 co-ordinates. The pushrod inboard locations are defined exactly as the co-ordinates from Pushrod inboard in the code line above. These appear to be "location" co-ordinates. So if the inboard is a co-ordinate definition, so should be the outboard. The BIG question is how to translate the description for "pushrod outboard=" to deliver the co-ordinates in the spreadsheet in cells C12 to E12? As discussed above my assumption is to mutiply the 3 position co-ordinate sets by their respective ratios and then respectively add them together to get one set of co-ordinates for the "pushrod outer="{eg. Pushrod Outboard = "x" co-ordinate is 0.817851*0.00258+0.106715*0.31015+0.075434*0.31715}. Since this action by itself does not result in the values in the 0.70 spreadsheet, the "offset=" and or something else must be influencing the resulting co-ordinates in cells c12 to E12. The question then is whether anyone understands how the "offset=" is applied to get the results shown in C12-E12? Hope that clarifies the question better? cheers
C12 to E12 are specified. It is the location of the outboard pushrod. Judging from the graphs, it is input relative to the cg. If you dig down into the spreadsheet you'll see how Offset is defined. I don't quite understand why what was done was done. I'm not sure I'd need to understand, as long as I input correct values.
Yes, I had not gotten further into the spreadsheet, but following the paths suggests that there is some very comprehensive math to generate the positioning of the roll centres based on all the details of the suspension geometry. It is interesting to see the level of detail considered.
