Noise & Vibration

Frequency determines the pitch of a sound: high frequencies sound sharp, whilst low frequencies sound more like a hum. Amplitude determines the intensity of the sound. Together, these factors determine how sound is perceived and what measures are needed to minimise disturbance.

Tonal components are specific frequencies that appear as peaks in the sound spectrum. These are often perceived as unpleasant, for example as high-pitched whistling or humming noises. In addition to the overall sound level, these components are therefore also taken into account, as they play an important role in perceived comfort.

No. Measurements are taken at various stages, such as during the FAT, site visits, sea trials and whilst the vessel is in port. This provides a comprehensive picture of how the systems perform under different conditions and allows their performance to be accurately assessed.

Yes. As well as comfort, noise and vibrations play a role in the safety of structures and equipment, the health of the crew and even marine life. Unwanted vibrations can cause damage, whilst noise can have an impact on the working environment and the surrounding area. That is why analyses are carried out not only with comfort in mind, but also with safety and sustainability in mind.

EMHA prefers to become involved at an early stage, for example when drawing up construction specifications. By assessing requirements and making forecasts in advance, insight is gained into feasibility and risks. Throughout the project, EMHA remains involved through checks and advice, thereby preventing problems at an early stage and ensuring that adjustments can still be made.

Noise forecasts provide advance insight into expected noise levels under various operating conditions. They are used to inform design decisions and identify risks at an early stage. Based on these forecasts, targeted measures can be taken before construction begins, thereby preventing costly modifications later on.

Based on measurements and forecasts, EMHA makes targeted recommendations to reduce noise levels. These can range from adjustments to design and insulation to the optimisation of components such as propellers and configurations. EMHA actively assists virtually all sectors of the shipping industry (inland waterway transport, luxury yachts, maritime shipping, etc.) in complying with applicable noise requirements.

Propeller design has a direct impact on noise, vibration, fuel consumption and performance. A well-designed propeller prevents unwanted vibration and noise pollution. EMHA can advise on which standards may be applied.

In the case of spring-mounted systems, consideration is given to the selection and application of vibration dampers and flexible couplings. These components are crucial for limiting vibrations from equipment, such as motors and generators, and preventing structural overload. The entire system can also be analysed to ensure optimum performance.

An insulation plan focuses on minimising sound transmission and takes into account acoustic, thermal and fire safety requirements. A privacy plan specifies the required sound insulation between rooms, ensuring that comfort and privacy requirements are met. Both plans complement each other within an integrated design.