Method for investigation of structure borne noise paths

摘要

The invention relates to a method for investigation of structure borne noise paths in a complex structure consisting of at least two parts connected by connecting elements for example dampers or engine mounts or suspension isolators, whereby one of these parts generates vibrations which cause noises. The method comprises the following steps:attaching at least one actuating device (6) comprising an additional inertial mass and an actuator to a point in the vicinity of a connecting element (4) between two parts of the structure said actuator (6) being connected with a controller (20);attaching at least one sensor (7, 8) for detecting the amount of vibration near the point in which the actuating device (6) is attached or in the actuating device, said sensor(s) being connected with the controller;obtaining (a) reference signal(s) from the part which generates vibrations;driving the controller (20) according a predetermined control strategy in consideration of said reference signal;measuring the change of vibration or noise at predetermined locations of the structure;calculating the influence of the vibrational force transmitted by the connecting element (4) on the measured values.