Complexity of Vehicle Brake Noise with applications of Active Control of Vibrations & Noise

A: Uniform oxidation mostly biases brake torque and doesn't sustain a squeal feedback loop. Hydrogen embrittlement needs plating processes and manifests as fracture, not noise drift. Chloride underfilm corrosion lifts the pad locally, reduces effective stiffness, and destabilizes the friction-induced mode. Thermal fatigue of the hat excites judder bands and sits well below squeal frequencies.

A: More clamp force raises energy input and can aggravate squeal modes. A floating architecture with compliance absorbs geometric error before it excites the pad-disc system. Disc runout control helps torque variation but doesn't isolate caliper-induced mode coupling. Higher control gain amplifies structural uncertainty and risks instability.

A: Actuators are isolated from the hydraulic force path and can't remove torque. Electrical saturation doesn't stay purely electrical because the control loop disengages. Saturation collapses the control authority, leaving the passive system intact but noisy. Disc thermal runaway is governed by braking energy, not the small actuator forces.

A: MMC doesn't guarantee alignment once assembled with mating parts. MMC allows geometric error to grow as size departs, which can stack unfavorably. Stiffness isn't defined by a GD&T modifier. Dynamic behavior is directly affected by alignment and constraint conditions.