A dryer weighing 1000 kg is to be installed at the production floor (see layout in...

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A dryer weighing 1000 kg is to be installed at the production floor (see layout in Fig. 1). Prior to machine installation, a site measurement by engineers to the nearby machine was performed. The free vibration test of the nearby machine indicates that the peak amplitude of 3.8mm was recorded at 1500 rpm and amplitude at resonance was recorded at 3.6mm. Site measurement also revealed that the nearby machine while operating at 1700 rpm transmits the vibration to the floor at amplitude of 1.0 mm. a) Calculate the natural frequency of the nearby machine during free vibration test. [4 Marks, CO1:PO1, C3] b) Estimate the transmissibility of the dryer if its amplitude of oscillation while operating at 1700rpm shall not exceed 3.5mm. [2 Marks, CO1:PO1, C2] c) Finally, you have decided that the dryer require a vibration isolation system at the mounting. Based on your calculation, suggest suitable material to use as isolator pad and calculate the natural frequency of the rotary dryer. Refer to Table 1 for the selection of industrial grades of isolator pads. [4 Marks, CO1:PO1, C3] Material Steel Spring Elastomers: Natural Rubber Neoprene Butyl Barry Hi Damp Barry LT Barry Universal Approx. Damping Factor C/C 0.005 0.05 0.05 0.12 0.15 0.11 0.08 0.33 0.12 0.17 0.06 Transmissi 100 10 10 4.0 3.5 4.5 6.0 1.5 Friction Damped Springs Metal Mesh Air Damping Felt and Cork Table 1. Damping factors for materials commonly used for isolators 4.0 3.0 8.0 Location of new drver PRODUCTION FLOOR Figure 1 Nearby machine A dryer weighing 1000 kg is to be installed at the production floor (see layout in Fig. 1). Prior to machine installation, a site measurement by engineers to the nearby machine was performed. The free vibration test of the nearby machine indicates that the peak amplitude of 3.8mm was recorded at 1500 rpm and amplitude at resonance was recorded at 3.6mm. Site measurement also revealed that the nearby machine while operating at 1700 rpm transmits the vibration to the floor at amplitude of 1.0 mm. a) Calculate the natural frequency of the nearby machine during free vibration test. [4 Marks, CO1:PO1, C3] b) Estimate the transmissibility of the dryer if its amplitude of oscillation while operating at 1700rpm shall not exceed 3.5mm. [2 Marks, CO1:PO1, C2] c) Finally, you have decided that the dryer require a vibration isolation system at the mounting. Based on your calculation, suggest suitable material to use as isolator pad and calculate the natural frequency of the rotary dryer. Refer to Table 1 for the selection of industrial grades of isolator pads. [4 Marks, CO1:PO1, C3] Material Steel Spring Elastomers: Natural Rubber Neoprene Butyl Barry Hi Damp Barry LT Barry Universal Approx. Damping Factor C/C 0.005 0.05 0.05 0.12 0.15 0.11 0.08 0.33 0.12 0.17 0.06 Transmissi 100 10 10 4.0 3.5 4.5 6.0 1.5 Friction Damped Springs Metal Mesh Air Damping Felt and Cork Table 1. Damping factors for materials commonly used for isolators 4.0 3.0 8.0 Location of new drver PRODUCTION FLOOR Figure 1 Nearby machine

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a Calculate the natural frequency of the nearby machine during free vibration test 4 Marks CO1PO1 C3 The natural frequency of the nearby machine can be calculated using the following equation f 12km W... View the full answer