The structure-borne noise while the vehicle passing across bridge expansion joint is main source of urban noise. In order to control this pollution, 20 bridges including three types typical joints in Ningbo City were selected, and noises measured passed joints. results are expressed by Z-weighted sound pressure level, which kept effect low-frequency Then influence factors discussed. show that: ...

In this paper, two Piezo-Based Rotating Inertial Actuators (PBRIAs) are considered for the suppression of the structure-borne noise radiated from rotating machinery. As add-on devices, they can be directly mounted on a rotational shaft, in order to intervene as early as possible in the transfer path between disturbance and the noise radiating surfaces. generate the appropriate actuation signals...

Fluid-filled pipelines occur in a wide variety of installations where they are excited by sources such as pumps and compressors through both the structure of the pipe wall and the fluid in the system. These vibrations may propagate downstream and result in unwanted radiated noise from the pipeline or connected structures. Although passive measures are available to control both structure and flu...

Tensor train is a hierarchical tensor network structure that helps alleviate the curse of dimensionality by parameterizing large-scale multidimensional data via a set of network of low-rank tensors. Associated with such a construction is a notion of Tensor Train subspace and in this paper we propose a TTPCA algorithm for estimating this structured subspace from the given data. By maintaining lo...

Engineers dealing with noise reduction in habitations close to transportation traffic or industrial facilities encounter several problems to decrease noise level in rooms at low frequencies. Passive materials and current building construction knowledge enable to avoid noise transmission in habitations at medium and high frequencies and the regulations based on the dBA scale can often be respect...