Case Study: High-Speed Spindle Digital Twin Using Multibody NX MCD

A 2022 conference paper by Smajić, Knežev, Stekolschik, and Zivkovic — "High Speed Spindle Simulation Using Multibody Siemens NX MCD" — is a machine-tool-industry application of MCD, distinct from the more common conveyor/pick-and-place examples. It represents the first step of a digital-twin development effort for a high-speed machine tool spindle, using 3D part and assembly modeling and multibody simulation in NX MCD.

Sources: paper metadata and findings aggregated from Semantic Scholar (https://www.semanticscholar.org/paper/High-Speed-Spindle-Simulation-Using-Multibody-NX-Smajic-Kne%C5%BEev/0a5f76dd441827653f0ddc544094278e3abdf91f) and Springer's chapter listing (https://link.springer.com/chapter/10.1007/978-3-030-88465-9_61); full text was not directly fetchable (ResearchGate access-walled the PDF).

What was modeled

The spindle's cross-section and full 3D assembly were built and simulated to characterize its dynamic behavior across an acceleration-to-max-speed cycle, using NX MCD's multibody physics rather than a dedicated rotor-dynamics tool.

Reported dynamic behavior findings

• Acceleration phase: acceleration showed a roughly constant trend with small oscillations during ramp-up.
• At maximum speed: acceleration began oscillating around zero, rather than staying flat/settled — a real dynamic behavior the simulation was able to expose.
• Shaft position sensors: the point where shaft position transition changes from nonlinear to linear was found to correlate with acceleration dropping to approximately zero — i.e., the model was able to relate a sensed kinematic quantity (position) to an underlying dynamic quantity (acceleration) in a way that would be hard to observe directly on real hardware without extensive instrumentation.
• Torque behavior: torque increased during acceleration and then sharply dropped to just above zero once maximum speed was reached, matching expected spindle-drive physics.

Why this is a useful supplementary reference

Most publicly available MCD material centers on discrete-motion machines (conveyors, pick-and-place, packaging). This paper demonstrates that MCD's multibody physics is also being applied to continuously-rotating high-speed machine-tool components, where the interesting outputs are torque/acceleration/position curves rather than discrete sequencing logic — useful evidence for anyone in the machine-tool space evaluating whether MCD's physics fidelity is adequate for spindle-type dynamic analysis (per the authors' framing, it was adequate for this first-step digital-twin characterization, though the paper is explicitly scoped as an early/foundational step rather than a finished validated digital twin).