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

Traction Machines

Traction Machines


(A) Noise Problems


Air-borne Noise

• Noise generated from the traction machine may cause noise disturbance to nearby residents. It mainly comes from the noise from motors, mechanical noise of geared systems, and noise from brakes.

Figure 31: Air-borne Noise from Traction Machines


Structure-borne Noise


• Vibration from the vibration impact of the traction machine may be transmitted through building structure at points where the machine is rigidly fixed to the structure without proper isolation. The vibration transmitted may activate the building structure to generate noise which causes noise disturbance to residents nearby (see Figure 32).

Figure 32: Structure-borne Noise from Traction Machines


(B) Practical Remedies


Air-borne Noise

• Provide thick walls, sound absorptive materials and soundproof door to plant room for traction machines (see Figure 33).
• Install silencers to air inlets and outlets.

(Noise Reduction Up to 10 dB(A))

Figure 33: Noise Absorption and Insulation in Plantroom for Traction Machines

Structure-borne Noise

• Use anti-vibration pad or vibration isolator (see Figure 34, Figure 35) and floating floor between the vibrating machines and the fixed building structure to avoid structural vibration transmission
• Provide an inertia block with vibration isolators to support the vibrating machines.

(Noise Reduction Up to 20 dB(A))

Figure 34: Vibration Isolation for Traction Machines

Figure 35: Anti-vibration pad for Traction Machines