Noise and vibration: the link between environmental

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Noise and vibration: the link between environmental legislation and torsional vibration29 July 2021 • 14:00-14:45 BST

Part ofMarine PropulsionWebinar Week26-29 July 2021

#marinepropulsion

Panellist documentsPage 2: Rich Merhige, AME SolutionsPage 12: Christof Sigle, Gesilco® & Acoustics Page 19: AME Solutions corporate literature

ADVANCED MECHANICAL ENTERPRISESNOISE & VIBRATIONLINK BETWEEN ENVIRONMENTAL LEGISLATION & TORSIONAL VIBRATION

Rich Merhige, [email protected]

mailto:[email protected]

THE BASICS• Vibration Analysis – Process of identifying anomalies and monitoring change.

• Fast Fourier Transform – Mathematical process converting raw vibration from the time to frequency domain.

THE BASICS• Mechanical faults cause harmful noise & vibrations.

• Crew habitability• Environmental sounds

LINEAR VS. TORSIONAL• Linear Vibration – Standard vibration analysis: Vertical, Horizontal, and Axial.

LINEAR VS. TORSIONAL• Torsional Vibration – Rotational vibration analysis: Change in angular velocity.

VIBRATION TRANSMISSION• Linear & torsional vibrations transmit

throughout machinery and hull structure.

• Low Frequency <500 Hz

• Gear Mesh

• Cavitation

• Hull vibration – Misalignment, Unbalance, Structural Resonance, etc.

VIBRATION TRANSMISSION• Noise – Vibrations that become airborne/waterborne.

• Noise affects marine life, such as whales, who communicate through sound/frequencies.

THE LINK• Up until early 2000's, no significant legislation existed.

• Emergence of marine mammal protection associations led to regulations being drafted.

• International Council for the Exploration of the Sea (ICES) created “Requirement 209” which specifies that noise radiated by the ship 1 meter away should not exceed 132dB

• Led to Directive 2008/56/EC which includes human-induced underwater noise in the definition of pollution.

• 2010 saw Det Norske Veritas (DNV) issue the Silent Class Notation – Different vessel types have different limits.

• In 2012 International Maritime Organization (IMO) adopted a regulation in the International Convention for the Safety of Life at Sea (SOLAS) requiring ship construction to reduce on-board noise – Geared toward personnel.

• In 2014 International Maritime Organization’s (IMO’s) – Marine Environment Protection Committee (MEPC) approved guidelines focused on reduction of underwater noise to mitigate negative impacts on marine life.

CORRECTIONS• Actions can be taken to minimize noise & vibration.

• Misalignment – Laser, Strain Gage, Jack-Up, etc.

• Unbalance – Shop and/or In-Situ

• Structural Resonance – Identify natural frequencies.

• Gear Mesh – Primary cause is misalignment.

217 SW 28th ST. FORT LAUDERDALE, FL 33315 | (954) 764 2678 |

CONCLUSION1. Vibration – Raw signal shown as oscillations in time domain

2. Vibration Analysis – Root Cause Identification

• Convert oscillations to frequency domain through Fast Fourier Transform.

• Identify mechanical faults through established patterns.

3. Noise – Vibration which becomes airborne/waterborne through transmission from hull and/or machinery.

4. Undersea Noise – Affects marine life by potential masking of vital natural sounds needed for:

• Communication

• Navigation

5. Corrections such as precision alignment, dynamic balancing, and structural resonant natural frequencies can be performed to minimize harmful noise & vibration.

• Location of food

• Migration

Geislinger Solutions for acoustically optimized drivetrain applicationsDr.-Ing. Christof Sigle, Director Gesilco® & Acoustics

2 | GEISLINGER ACOUSTIC SOLUTIONS

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MAJOR FIELDS WITH ACOUSTIC REQUIREMENTS


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SOUND TRANSFER

RADIAL VIBRATIONS

TORSIONAL VIBRATIONS

AXIAL VIBRATIONS

PRIMARY PATH SECONDARY PATH


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ACCOUSTICALLY OPTIMIZED COUPLINGS

REDUCTION OF TORSIONAL VIBRATIONS

ACOUSTICALLY OPTIMIZED STEEL SPRING COUPLING

Linear and constant parameters even under low vibratory amplitudes

Stiffness and damping can be adjusted exactly to customer requirements

Compact and high power density coupling solution

REDUCTION OF SOUND TRANSMISSON

ACOUSTIC COUPLING COMBINATION SILENCO®

Optimized acoustic attenuation with maximized transmission loss

Lightweight and maintenance-free

Lowest reaction force


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POWERTRAIN NOISE OPTIMIZATION

Torsional vibration aspects:Lowest vibratory torque at gearbox input shaft; < 2% of nominal torque

Acoustic aspects:High frequency gear box effects (> 300Hz – 2000Hz)

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Speed

–– STANDARD COUPLING –– OPTIMIZED STEEL SPRING COUPLING –– 2 % Limit


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Measuring of sound transfer during sea trial

System analysis with laser measuring device

INSTALLATION AND FIELD SERVICE


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KEY TAKE AWAYS

Reduction of vibration is key to reduce engine and powertrain noise

Highly integrated solutions save weight and installation space

Geislinger has more than 60 years experience in marine propulsion powertrains

SOLUTIONS TO OPTIMIZE RELIABILITY

TESTING & ANALYSIS

ALIGNMENTMACHINERY

SERVICESPRODUCT

SOLUTIONS

Marine | Industrial

AME is an engineering services company specializing in predictive & preventative maintenance for assets on land & sea. If you have a machine that rotates, you can

benefit from our services while maximizing the availability & reliability of your machinery.

Rotating & Reciprocating Machinery

INDUSTRIES WE SERVE:Power Generation | Food Processing Manufacturing | Commercial VesselsYachts | Commercial Buildings | Mining Pharmaceuticals | Steel Mill Water Treatment | Waste Management

Testing & Analysis

- Asset Maintenance Plans

- Vibration analysis & Noise surveys

- Remote monitoring

- Oil analysis

- Infrared thermography

- Motion Amplification

Alignment

- Laser & optical alignment

- Balancing (Field & Shop)

- Machinery isolation

- Strain gage alignment

Machinery Services

- Welding, fabrication & pipe fitting

- Machining & line boring

- Hydraulic service & repair

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Product Solutions

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Documents

Noise and vibration: the link between environmental