The invention provides a method for testing mechanical impedance of a vibration isolator by considering the influence of a base. The flexible base with the limited mass and the limited rigidity can beused in a testing process; the influence of the characteristics of the base on the mechanical impedance of the vibration isolator can be considered; and the defect of a blocking method can be compensated, so that the obtained mechanical impedance can better conform to the mechanical impedance characteristics of the vibration isolator in an actual vibration isolation system. According to the method, a special impedance table no longer needs to be used for testing, so that the testing conditions are reduced and the testing cost is reduced; and the problem of a testing error caused by the fact that the impedance table does not meet the "blocking" requirement is not required to be considered.

Method for testing mechanical impedance of vibration isolator by considering influence of base

The invention discloses an online forecasting method for high-frequency mechanical noise of a structure, and belongs to the technical field of noise forecasting. The method comprises the following steps: building a reasonable and effective constraint and load statistical energy analysis model aiming at an engineering practice structure; obtaining quality data of various stimulated sub-systems by the built statistical energy analysis model; testing vibration response data of the stimulated sub-systems through a test; calculating energy data of the stimulated sub-systems by combining the quality data with the response data; obtaining radiated sound power energy mechanical mobility data corresponding to the stimulated sub-systems according to the model; and finally calculating the radiated sound power of the structure, and finishing online forecasting. The online forecasting method has the beneficial effects that rapid calculation from load to radiated sound power is achieved by the system transfer mobility invariability; the problem of relatively long elapsed time of the traditional algorithm is solved; and rapid forecasting of mechanical noise of the structure is achieved. The online forecasting method is considerable in accuracy and relatively short in elapsed time, can be applied to the online forecasting engineering practice, and has a wide application prospect.

Ma Jian Gang

Papers

Online forecasting method for high-frequency mechanical noise of structure