Good Practices on the Control of Noise from Electrical & Mechanical Systems

Defective Implementation of Noise Mitigation Measures

Noise Leakage through Noise Barriers or Enclosures

The presence of holes, slits, cracks or gaps through noise barriers and enclosures can reduce the noise isolation performance significantly. The problem is rectified by sealing up of the gaps.

Short-circuited Vibration Isolators

Short-circuiting of vibration isolators greatly affects the vibration isolation and thus the structure-borne noise reduction performance. An example of deflective implementation of vibration isolators is shown in Figure 48. The metal spring had been tightened up by building management due to a lack of understanding of the vibration isolation mechanism, leaving no clearance for the functioning of the vibration isolator, causing excessive transmission of structure-borne vibration to the receiver within the building. The problem is rectified by reinstating the initial setting of the metal spring, leaving the metal spring to vibration freely to achieve the desired vibration isolating performance.

Figure 48: An Example of Deflective Implementation of Vibration Isolators