Methodology to Identify Noise and Vibrations Problems for Ride Quality Improvements

Comfort is an important issue in the lift industry. This paper shows a methodology used to perform the vibro-acoustic characterisation of lift installations to provide data regarding the functional behaviour and to propose changes in the installations to improve the ride quality in car and to reduce the noise levels in the car. To achieve these objectives, different vibro-acoustic analysis techniques are applied to identify the main frequencies of noise and vibration that could lead to an increase in noise and vibration inside the car. The different techniques applied are FFT analysis, 1/3 octave analysis, vibration transmission by FRF analysis, Operational Modal Analysis and Operational Deflection Shapes. With this analysis, it is possible to determine the components that must be modified in order to improve the design and functionality, with the objective of either reducing the source or minimising transmission paths (airborne or structural), or removing any resonance that may increase vibration and noise inside the car.