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Simxperience Simvibe spectrum analysis on F1 cars of rFactor 2 & rfactor chassis vibrations bumps
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Simvibe offers a chassis model to drive four transducers on chassis. This video I took about 6 years ago showed a spectrum analysis of front two outputs from the SimVibe. I turned off the engine vibration. All others were set to 100%. I tested F1 cars of rFactor 2 and rFactor. I purposely drove those cars over side way and apexes on the tracks in order to see if there is any difference between left and right side vibration.
The top chart shows waveform and the bottom chart shows FFT in real time. The FFT spectrum of rF2 is complex and display pretty rich distribution through bandwidth up to 110Hz. There is a clear high frequency mode of 110Hz. It is persistent and pretty strong. I think this mode is of vibration due to track surface texture. It disappears while both front wheels run over side way or grass. While foot being off the gas pedal, it seems to disappear too. This suggests it may be related to eng sound (somehow SimVibe may have used eng sound for trigger?). Also, rF2 API output refresh rate (telemetry data refresh rate) is 120Hz. So any resolution of surface detail higher than 120Hz will be truncated. I would think this mode is due to data fresh rate. Because the spectrum is so complex with no clear persistent fundamental mode to be seen, it suggests that rF2 SimVibe outputs pretty complex vibrations.
The FFT spectrum of rF1 showed simpler than that of rF2. The fundamental mode of vibrations shown in the FFT spectrum for rF1 is less 10 Hz. These Ride Frequencies are cleaner than that of rF2. The spectrum is flatter with two signature modes at about 85-90Hz (minor) and 110 Hz (major). While running over side of road or an apex, the spectrum showed more complicate. The rF1 spectrum shows the fact that revealing vibrations on track less detail than rF2 does. Sometime very low fundamental mode ( less than 5 Hz) shows up. Again, Like rF2, the API output refresh rate (telemetry data refresh rate) is 120Hz. So any resolution of surface detail higher than 120Hz will be truncated.
In terms of difference between left and right signals by SimVibe, this study may not be conclusive on the track. It has no evidence on rF1 to show any difference between left and right signals. For rF2, at 2:42 and 3:34 of this video do show a difference between left and right signals in spectrum. An observation of a difference between left and right is possible during a moment when a wheel runs over an apex or over side way. But such duration is very short. This analyzer's refresh rate may be too low to capture (real-time). Thus it might not be possible to see a burst diff in this analyzer.
The top chart shows waveform and the bottom chart shows FFT in real time. The FFT spectrum of rF2 is complex and display pretty rich distribution through bandwidth up to 110Hz. There is a clear high frequency mode of 110Hz. It is persistent and pretty strong. I think this mode is of vibration due to track surface texture. It disappears while both front wheels run over side way or grass. While foot being off the gas pedal, it seems to disappear too. This suggests it may be related to eng sound (somehow SimVibe may have used eng sound for trigger?). Also, rF2 API output refresh rate (telemetry data refresh rate) is 120Hz. So any resolution of surface detail higher than 120Hz will be truncated. I would think this mode is due to data fresh rate. Because the spectrum is so complex with no clear persistent fundamental mode to be seen, it suggests that rF2 SimVibe outputs pretty complex vibrations.
The FFT spectrum of rF1 showed simpler than that of rF2. The fundamental mode of vibrations shown in the FFT spectrum for rF1 is less 10 Hz. These Ride Frequencies are cleaner than that of rF2. The spectrum is flatter with two signature modes at about 85-90Hz (minor) and 110 Hz (major). While running over side of road or an apex, the spectrum showed more complicate. The rF1 spectrum shows the fact that revealing vibrations on track less detail than rF2 does. Sometime very low fundamental mode ( less than 5 Hz) shows up. Again, Like rF2, the API output refresh rate (telemetry data refresh rate) is 120Hz. So any resolution of surface detail higher than 120Hz will be truncated.
In terms of difference between left and right signals by SimVibe, this study may not be conclusive on the track. It has no evidence on rF1 to show any difference between left and right signals. For rF2, at 2:42 and 3:34 of this video do show a difference between left and right signals in spectrum. An observation of a difference between left and right is possible during a moment when a wheel runs over an apex or over side way. But such duration is very short. This analyzer's refresh rate may be too low to capture (real-time). Thus it might not be possible to see a burst diff in this analyzer.