In order to analyze the connection of the compressor to the condensing unit, we assume that the outside of the compressor surrounds an acoustic control body. By controlling the noise energy flow of the body, its propagation path is divided into structural propagation and fluid propagation. Structural propagation includes energy flow through the fixed feet into the chassis, energy flow along the suction and exhaust lines, and energy flow through the cable. The fluid propagation path includes the forward flow pressure vibration propagation on the exhaust side and the reverse flow pressure vibration propagation on the suction side. Here, the noise radiated from the compressor casing is also considered to be a fluid propagation path. In addition to a separate assessment of each propagation path, the balance between energy flows must also be considered. A low-order assumption is sometimes used in noise control engineering, which assumes that the sonic energy produced by the machine is a function of its performance parameters. In fact, many noise-controlled textbooks describe the use of electrical power to estimate the acoustic energy generated by electric motors, fans, and pumps. In residential air conditioning and heat pump systems, refrigeration compressors are the primary source of noise. This article summarizes a reduced residential air conditioner! The heat pump system noise and vibration scheme, and provides design guidance; demonstrates a method to reduce compressor noise considering the interaction of the system; discusses the confirmation of the noise transmission path and the experimental model analysis in the condensing unit shell The result is a vibration model that generates system noise, and finally a solution to reduce the echo effect model. The panel discusses the noise reduction compressors when considering system interactions. These methods usually assume structural attenuation or sonic absorption is low-order. However, even for the most significant attenuation, energy dissipation should be treated as an energy flow path. Thus, any energy propagation in one path decreases, and the energy flow in the other path increases. The structural energy flow from the fixed foot of the compressor to the chassis is most important in the noise control of the condensing unit. Elastic washers are usually mounted between the feet and the chassis to provide vibration isolation. When selecting a gasket, the design goal is to isolate the frequency below the compressor's rotational frequency (to). However, there are two design elements that are often overlooked in the selection of vibration isolation gaskets. First, low-frequency insulation is required for low frequency isolation. However, the weight of the compressor preloads the gasket to the point of failure. Therefore the gasket material must ensure that the compressor has sufficient dynamic displacement.
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