an investigation of the role of pad isolator in transmitted vibration reduction in the body of the duct and fan base of ventilation systems

background : the application of ventilation systems in industries and workplaces is with the aim of improving environmental conditions for employees. the lack of appropriate ventilation system components design and control methods result in the production of sound and vibration in most components. the purpose of this study was to determine the role of the pad isolator in controlling vibration and reducing noise in ventilation systems. methods: this analytical study was performed on the heating, ventilation and air-conditioning (hvac) system that had a galvanized duct and axial fan. vibration measurements were carried out on the body of the channel and the fan base and reduction of the amount of transmitted vibrations was assessed after installation and application of the isolator. findings: a 61% reduction in fan vibration velocity at 2580 rpm was observed and maximum effect of the vibration isolator was observed in 2580 rpm. moreover, the isolator had a much greater effect on reducing the rate of vibration at high speeds. at a speed of 2200 rpm and below, vibration velocity was decreased noticeably. conclusion: our study indicates that the performance of the rubber isolator is efficient in small machines such as fans in air conditioning systems. based on the load, static deflection, and compression level of the materials used, isolators can be used as an effective means of reducing vibration.