dyno-graph-tool

viewer for dynapro dynarun v3 .Dpr files. parses the format, computes corrected wheel torque and power from roller inertia + angular acceleration + friction poly.

image

what it does

• multiple graphs, right-click any axis to pick a series
• auto-fit with 5% padding, double-click to re-fit
• series: rpm, time, speed, torque, power

building

needs cmake ≥ 3.20 and a c++23 compiler. all deps fetched automatically.

# linux
sudo apt install libgl-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libxkbcommon-dev libwayland-dev
cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build -j
./build/dyno_viewer

# windows
cmake -B build
cmake --build build --config Release
build\Release\dyno_viewer.exe

usage

./dyno_viewer [path/to/file.Dpr]

or just launch it and drag a file in. click + add graph, right-click an axis to change it, double-click to re-fit.

deps

all fetched via cmake, you don't need to install anything besides the build prereqs above.

• glfw 3.4
• dear imgui 1.91.8
• implot 0.16
• portable-file-dialogs

.dpr format

dynarun v3 files are csv text (cp1252), ~39 header rows then a 41-column data block. row 3 can have rtf notes with newlines inside a quoted field so the parser reads char by char. some header fields are hex-encoded ascii floats.

torque

$$T = \frac{F(v)}{0.7375621} + I \cdot \alpha$$

$F(v)$ is friction loss in ft·lb from a cubic poly over wheel speed (mph), $I$ is roller inertia (kg·m²), $\alpha$ is angular acceleration via 51-sample buffer span. power is just $P = T \cdot RPM / 9549.3$ in kw.