Dr. Thomas Bischof
Founder and owner
Twenty-six years of NVH method development at ZF, running his own engineering office full-time since 2022.
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Who does the work
An engineering office for rotor-synchronous noise excitation. These are the people who work there.
How the work runs
Five steps, in this order
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Understand the complaint
What is heard, where, under which operating conditions — and who decided it is a problem. A noise that only appears in coast-down is a different investigation from one that scales with load.
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Check what the data can carry
Before analysing anything: is shaft angle available, is the run repeatable, does the speed range cover the suspected orders. If not, that is the first deliverable.
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Model the kinematics
The kinematics define which orders each element can produce. This is what turns a spectrum into a list of testable hypotheses instead of a picture to stare at.
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Resolve and separate
Shaft-synchronous analysis per exciting element, sidebands included, so excitations that overlap in frequency stop overlapping in the result.
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State the conclusion with its limits
Named cause, operating range it holds for, separation quality behind it — and an explicit note where the data does not decide.
Principles
Three things we do not negotiate
Reproducible or it did not happen
Every figure traces back to a frozen analysis version: same data, same parameters, same result, months later.
No conclusion beyond the evidence
A ranked list of candidates with honest uncertainty is worth more than one confident answer that turns out wrong in the next build.
You keep the analysis
Not just a report. The model, the runs and the evaluation stay accessible to your team in the platform.