Reduction of noise and vibrations, passenger comfort, respect of nouse directive and regulation
Ghh-Valdunes offers customised solutions and its wide expertise:
- Solutions for squealing and rolling noise
- Wheels specifically designed to reduce noise and vibrations, through optimised geometry
- Dampening devices, permanent or removable, for easier maintenance
Complete Systems specifically designed for different markets
- Urban transportation: Tramways, LRVs and metros
- Suburban transportation: Tram-trains and trains
- Passenger transportation: Main passenger lines
- High speed and very high speed trains
- Goods transportation: freight trains
Tramways and light rail vehicles
- Speed: up to 80 kph
- Challenge: Squealing noise, especially in tight curves, impairing passenger comfort and generating public nuisance. Low or ultra low floor vehicles.
- GHH-Valdunes solution: Resilient wheel, with wide range of radial stiffness - from SAB V60 rubber sprung wheel to VUT™ low stiffness wheel. Potential use of dampening devices according to specific needs (damping rings, vibration absorbers, permanently fixed or removable).
- Result: squealing noise reduced up 10 dB(A).
Metros, Tram-trains and suburban trains
- Speed: up to 120 kph
- Challenge: Squealing noise in urban zones, impairing passenger comfort and generating public nuisance. Vibration propagation in densely populated areas.
- GHH-Valdunes solution: resilient wheels, damping rings, vibration absorbers, permanently fixed or removable.
- Result: Squealing noise reduced up to 15-20 dB(A) on specific frequencies.
Main passenger lines and freight trains
- Speed: up to 200 kph
- Challenge: rolling noise, detrimental to passenger comfort, generating public nuisance and not compliant to noise regulation or directive.
- GHH-Valdunes solution: composite vibration absorbers; VMS™ low stress wheel coupled
with composite braking blocks.
- Result: noise reduction up to 5-7 dB(A).
High and very high speed trains
- Speed: 200 kph and above.
- Challenge: rolling noise, detrimental to passenger comfort, generating public nuisance and not compliant to noise regulation or directive.
- GHH-Valdunes solution: optimised wheel geometry coupled with dampening device
or shields.
- Result: noise reduction up to 7 dB(A).
