Noise and Vibration specifications are not one size fits all. Use J&A’s experience to make sure a project’s goals/expectations align with the size, speed, operational profile, and budget. Routine noise levels on a 300’ displacement vessel may be impossible to achieve on a 70’ high speed craft. A successful project starts when expectations of designers, builders, and customers are aligned to these and we:

• Work with owners to set noise/vibration specifications aligned with their needs, budget, and vessel character.

• Advise shipyard of contractor/cost implications of meeting contract noise and vibration specifications.

J&A utilizes a wide range of analysis and prediction methods from advanced FEA, SEA, signal processing, and modal analysis to handbook and back of the envelope calculations. All of our methods are backed by years of validation in the field. J&A Engineers take pride in adapting to the conditions on board and providing accurate, timely and efficient analysis to our clients. We have deep expertise in machinery isolation and shaft dynamics including complicated combined 6-degree of freedom (6DOF), lateral (whirling) and axial vibration calculations. J&A can provide Classification Society approved calculations.

Correct installation and treatment details are critical to effective noise and vibration isolation. J&A routinely conducts virtual and onsite visits and inspections during vessel construction to offer guidance and training to designers, fabricators, and installers. These visits catch problems early in construction, before they expand into costly rework.

J&A is a widely recognized authority on noise and vibration testing and compliance. J&A maintains a large inventory of calibrated precision test equipment and is an ABS Recognized Service Supplier. We have experience testing to a wide variety of US and international standards including ABS HAB, IMO MLC, Lloyds, RINA, DNV-GL, ISO, EU CE, MIL-STD-740-2, MIL-STD-1474E. J&A’s deep technical expertise allows us to resolve many testing and compliance issues in the field, saving builders, owners, and operators time and money. Types of testing include:

• Documentation for shipyards

• Acceptance per contract specifications

• Factory Acceptance Tests

• Pre/Post shipyard work

• Long-term environmental/noise exposure

Get the experts onboard. J&A solves noise and vibration problems. Whether something is shaking, cracking, or just plain annoying, we can identify the source and use our years of experience and engineering expertise to recommend practical and effective solutions. We also provide pre- and post-refit and/or sale surveys to protect owners and yards from costly disputes and unmet expectations. Typical diagnostic tasks include:

Defining the problem by amplitude, frequency, mode of operation

Identifying the source, and its mechanism of noise/vibration generation

Outlining a range of solution options

Designing the selected treatment option

See Examples of Recent Noise & Vibration Diagnoses and Fixes