DUCTED SILENCER TEST FACILITY WITH ADJUSTABLE TEST DUCT IN CHINA ACADEMY OF BUILDING RESEARCH

摘要

In laboratory measurements for ducted silencers of different size or shape, transitions are needed to connect mismatching cross sections of test silencers and test duct, which may lead to unexpected deviations in test results and limit the dimension of test objects. To minimize the interference caused by the insertion of transitions, China Academy of Building Research established a ducted silencer test facility with adjustable test duct in 2016. The ductwork is constructed of a steel platform and compound metal modules. By changing the configuration of the modules, the cross section of test duct can vary from 500mm×400mm to 1000mm×1400mm, 12 sets in total. Silencers of the same size and shape can be installed directly, while other test objects can be connected to the test duct through transition as usual, which can minimize the cross section changes.