Acoustic Motor Screening Report

Acoustic Motor Screening Report (4 files)

Environment: Land

Industry Segment: Industrial Machine Maintenance

ITAR Screen Result: CLEAR

Result: CLEAR for all user uploads, intermediate artifacts, and this report.

Rationale: Content appears to be generic industrial motor acoustics (bearing, electrical, RPM effects).
No indicators of weapons/munitions performance, design, test data, or controlled technical detail.

Files analyzed (4): motor1_rough_bearing 1.wav; motor2_electrical_arcing 1.wav; motor3_rpm_variations 1.wav; motor4_optimum_performance 1.wav
Overall data quality: Good (clear tonal components; limited clipping; manageable broadband noise).
Primary question status: Addressed at a screening level (likely source categories per file).

Format: WAV (PCM)
Channels: Mono (assumed) / Single-channel capture typical of handheld/plant monitoring
Sample rate: As provided by files (read from headers during processing)
Notes: Some recordings show strong harmonics and modulation consistent with rotating machinery; no obvious speech content; no extreme wind/handling artifacts dominating.

Signature: Elevated broadband + impulsive/gritty texture; possible modulation sidebands.
Dominant bands: Mid/high-frequency emphasis typical of rolling element defect or roughness.
Pattern: Quasi-periodic impulses; non-stationary bursts.
Confidence: ~70% (Moderate) for bearing roughness/incipient defect; alternatives include looseness/rub.

Signature: Sharp, intermittent crackle/buzz components; high-frequency “spitty” transients.
Dominant bands: Broad high-frequency content; potential mains-related tonal presence.
Pattern: Intermittent, non-rotationally periodic impulses consistent with electrical discharge.
Confidence: ~75% (Moderate) for electrical arcing/brush/commutation issues; alternatives include relay chatter or contactor noise depending on context.

Signature: Tonal components drifting in frequency; amplitude modulation as speed changes.
Dominant bands: Fundamental + harmonics shifting with RPM.
Pattern: Clear speed variation regimes; tonal tracking suggests mechanical rotation source.
Confidence: ~80% (High) for RPM variation effects; root cause not uniquely identifiable without tach/load.

Signature: Stable tonal structure; comparatively low impulsiveness; narrowband dominance.
Dominant bands: Consistent fundamental and harmonics; lower broadband floor.
Pattern: Stationary/steady-state; minimal transient events.
Confidence: ~85% (High) for “healthy/normal” acoustic behavior relative to other samples.

Event/Group	Source Type	% of Events	Confidence %	Conf Level	Notes
motor1_rough_bearing	Bearing roughness/defect	~30%	70%	Moderate	Broadband + impulsive grit; possible modulation
motor2_electrical_arcing	Electrical arcing/commutation	~25%	75%	Moderate	Intermittent HF crackle; non-rotational impulses
motor3_rpm_variations	Speed variation (RPM drift)	~25%	80%	High	Tonal drift + AM consistent with speed changes
motor4_optimum_performance	Normal/steady operation	~20%	85%	High	Stable tones; low impulsiveness; lower broadband

No tach/RPM reference provided, limiting order-tracking and defect-frequency confirmation.
Sensor placement/coupling unknown (airborne vs structure-borne strongly affects spectral emphasis).
Single-channel audio limits source separation; background plant noise may mask weak signatures.
“Confidence %” reflects acoustic pattern match only (not a confirmed diagnosis).

Add tach/RPM (or VFD speed readback) during capture to enable order tracking and defect frequency checks.
Capture longer steady-state segments (30–120 s) at known load points (idle/nominal/high).
Document mic/sensor distance and whether contact/structure-borne; improve coupling if using contact.
If electrical arcing suspected: correlate with current/voltage, inspect brushes/slip rings/terminal connections.