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Low-frequency motorcycle rumbling noise

Test Setup

Source Strength Analysis

Source Strength Analysis

Low-frequency motorcycle rumbling noise was measured by Sound Viewer inside a semi-anechoic chamber.

Source Strength Analysis

Source Strength Analysis

Source Strength Analysis

Hot spots of motorcycle low-frequency rambling noise (< 200 Hz) were identified. The source strengths in terms of sound power levels were determined and ranked.

Motorcycle Noise Sources

Source Strength Analysis

Wave Form and Spectrogram

Motorcycle low-frequency noise sources were located: 1) Lower back clutch; 2) Hanger of front clutch; 3) Upper back clutch; 4) Lower front clutch. 

Wave Form and Spectrogram

Low-frequency motorcycle rumbling noise in 2D

Wave Form and Spectrogram

The time-domain wave form and spectrogram of motorcycle low-frequency rambling noise at 20 - 200 Hz).

Low-frequency motorcycle rumbling noise in 2D

Low-frequency motorcycle rumbling noise in 2D

Low-frequency motorcycle rumbling noise in 2D

 Locating motorcycle low-frequency rambling noise below 200 Hz in 2D view.

Low-frequency motorcycle rumbling noise in 3D

Low-frequency motorcycle rumbling noise in 2D

Low-frequency motorcycle rumbling noise in 2D

Determining motorcycle low-frequency rambling noise below 200 Hz in 3D view.

Automotive noise and vibration testing and analysis

Truck Front Dash Panel

Use laser-assisted reconstruction to obtain all vitro-acoustic characteristics of a full-size truck front dash panel.

Wind Tunnel Tests

Use Sound Viewer Pro to analyze the aerodynamically generated sound field around a full-size SUV.

3D Scanning Analysis

Use 3D scanning to analyze the aerodynamically generated sound fields around the rearview mirror of a full-size sedan inside a wind tunnel.

Truck Exhaust Noise

 Use Sound Viewer to locate very low frequency exhaust noise of a full-size truck.

Door Slamming Noise

Analyse door slamming sound and observe its time-space-frequency-visual-audio effects of a sedan.

Interior HVAC Noise

 Use Sound Viewer to locate HVAC noise sources and determine their levels inside a full-size sedan.

On-line product quality control testing without enclosures

QC for Gearbox & Motor

Locate gearbox noise, estimate its sound power level, and perform order tracking analysis at any user-selected orders on an assembly line.

QC for Electric Motor

  Discern normal and defective  motors and identify individual orders and speed ranges at which abnormal sounds are detected on the factory floor.  

QC for Textile Winder

QC for Textile Winder

Discern normal and defective textile winders and examine the feasibility of using Sound Viewer to perform continuous machine health monitoring on a factory floor.

Vibro-acoustic analysis of household appliances

Shell Vibro-Acoustics

Analyze sound radiation from a shell-type structure and examine the impacts of different damping materials on STL.

Kitchen Sink Disposal

Visualize surface acoustic pressure and normal surface acoustic intensity vector distributions on a disposal.

Hair Clippers and more

Hair Clippers and more

 Detect and extract target information from directly measured time-domain signals that are contaminated by random background noise and unspecified interering signals.

Disruptive technology for analyzing noise and vibration

Sound Viewer Overview

Sound Viewer is a one-of-a-kind system that enables one to get a holistic view of vibro-acoustics.

CAT Scan

Sound Viewer offers a super resolution in source localization in sources localization in 3D space.

Extreme Challenges

Extreme Challenges

Examples of extreme challenges for Sound Viewer to locate multiple noise sources in 3D space.

Airborne, Coherent, and Transient Sounds

[Airborne Sounds] 3D Scanning inside wind tunnel (pdf)Download
[Airborne Sounds] Interior HVAC (pdf)Download
[Airborne Sounds] Muffler Noise (pdf)Download
[Airborne Sounds] Tire Noise (pdf)Download
[Airborne Sounds] Truck Exhaust (pdf)Download
[Airborne Sounds] Wind Tunnel Test (pdf)Download
[Coherent Sounds] Coherent Sources (pdf)Download
[Transient Sounds] Door Slamming (pdf)Download
[Transient Sounds] Windshield Wiper (pdf)Download

Structure-borne Sounds

[Structure-borne Sounds] Engine Compartment (pdf)Download
[Structure-borne Sounds] Negative SNR (pdf)Download
[Structure-borne Sounds] Operational Deflection Shape (pdf)Download
[Structure-borne Sounds] Sealed Structure (pdf)Download
[Structure-borne Sounds] Shell Structure (pdf)Download
[Structure-borne Sounds] Sound Intensity (pdf)Download
[Structure-borne Sounds] Sound Transmission Losses (pdf)Download
[Structure-borne Sounds] Sound Transmission Paths (pdf)Download
[Structure-borne Sounds] Structural Damping Ratios (pdf)Download
[Structure-borne Sounds] Surface Acoustic Pressure (pdf)Download
[Structure-borne Sounds] Truck Engine (pdf)Download
[Structure-borne Sounds] Vehicle Underbody (pdf)Download

QC Testing, Super Resolution, and Misconceptions

[QC Testing] Electric Motors at Constant Speeds (pdf)Download
[QC Testing] Electric Motors at Variable Speeds (pdf)Download
[QC Testing] Power Supply Switches (pdf)Download
[QC Testing] Textile Winders (pdf)Download
[Super Resolution] Cell phones (pdf)Download
[Super Resolution] Headphones (pdf)Download
Misconceptions (pdf)Download

Signal-Wise LLC

888 W Big Beaver Rd Ste 207, Troy, MI 48084, US

(248) 561-5064

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