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Bulk strength and weight properties are also very favorable when compared to metals. Common applications of fiberglass include high performance aircraft gliders, boats, automobiles, bath tubes enclosures, septic tank, water tanks, roofing, pipe claddings, surf boards and external door skins. The Statistical Energy Analysis (SEA) mostly used to describe the vibro-acoustic behavior of the complex structures. SEA is proposed for medium and high frequency region to predict the vibrational response of the structure. A structure with many resonances can be modeled in a deterministic model and can be easily analyzed with statistical nature of SEA method. The model of SEA based on energy balance and power flow among the group of modes in a structure. A complex model can be divided into simple subsystems [12].The modal densities of these subsystems are then approximated by mathematical expressions for simple structures. Since the boundary conditions of the structure are neglected while analyzing the model, so results obtained by these expressions are to be incorrect [2]. This paper shows the comparison of modal densities obtained for composite materials with different fiber orientations and also comparison of modal densities of composite materials with conventional materials like mild steel, aluminum and stainless steel.

Table 1 Bulk strength and weight properties are also very favorable when compared to metals. Common applications of fiberglass include high performance aircraft gliders, boats, automobiles, bath tubes enclosures, septic tank, water tanks, roofing, pipe claddings, surf boards and external door skins. The Statistical Energy Analysis (SEA) mostly used to describe the vibro-acoustic behavior of the complex structures. SEA is proposed for medium and high frequency region to predict the vibrational response of the structure. A structure with many resonances can be modeled in a deterministic model and can be easily analyzed with statistical nature of SEA method. The model of SEA based on energy balance and power flow among the group of modes in a structure. A complex model can be divided into simple subsystems [12].The modal densities of these subsystems are then approximated by mathematical expressions for simple structures. Since the boundary conditions of the structure are neglected while analyzing the model, so results obtained by these expressions are to be incorrect [2]. This paper shows the comparison of modal densities obtained for composite materials with different fiber orientations and also comparison of modal densities of composite materials with conventional materials like mild steel, aluminum and stainless steel.

Related Figures (9)

Figure 1 .Energy balance of a two-subsystem problem the power dissipated in the subsystem and the net power flow to the subsystem 2 as shown in figure | Fig 2 .
Figure 1 .Energy balance of a two-subsystem problem the power dissipated in the subsystem and the net power flow to the subsystem 2 as shown in figure | Fig 2 .
Figure 2.Detailed experimental setup for preparation of composite plate
Figure 2.Detailed experimental setup for preparation of composite plate
The composite plates made up of different plies orientations were taken for analysis. One by one the plate is taken for analysis and readings were noted for comparison. For experimental evaluation E-Glass Epoxy (10% E-Glass fibres, LY556 Epoxy resin) with unidirectional fibre orientation is considered [5] s shown in above fig 3 and Fig 4
The composite plates made up of different plies orientations were taken for analysis. One by one the plate is taken for analysis and readings were noted for comparison. For experimental evaluation E-Glass Epoxy (10% E-Glass fibres, LY556 Epoxy resin) with unidirectional fibre orientation is considered [5] s shown in above fig 3 and Fig 4
fibres, LY556 Epoxy resin) with unidirectional fibre orientation is considered [5] s shown in above fig 3 and Fig 4 Figure 5.Amplitude Vs frequency sample spectrum of 10LY556 (0)
fibres, LY556 Epoxy resin) with unidirectional fibre orientation is considered [5] s shown in above fig 3 and Fig 4 Figure 5.Amplitude Vs frequency sample spectrum of 10LY556 (0)
Table 1.List of different composite plate specimens Table 2.Modal densities of composite plate and conventional plates like M.S., Allu. &S.S.
Table 1.List of different composite plate specimens Table 2.Modal densities of composite plate and conventional plates like M.S., Allu. &S.S.
Figure 6.Comparison of modal density of composite plate with conventional plate like MS, Al, SS based on experimental test results To observe the vibrational response of the composite plate material, comparison of modal density of composite plate is made up with the conventional material like Mild Steel, Aluminium and Stainless Steel [10].
Figure 6.Comparison of modal density of composite plate with conventional plate like MS, Al, SS based on experimental test results To observe the vibrational response of the composite plate material, comparison of modal density of composite plate is made up with the conventional material like Mild Steel, Aluminium and Stainless Steel [10].
Figure 7.Effect of changes in fiber orientations on modal density of composite plates based on experimental test results the figure 6, it is clear that modal density of composite plate is lower than the conventional plates because of the damping property of the material . Similarly to observe effect of changes in fibre orientations on modal density of fiberglass composite plates, the modal density is obtained for E-Glass Epoxy (10% E-Glass fibres, LY556 Epoxy resin)[0],2(unidirectional orientation), [03,+/-45,90],(Quasi isotropic orientation), [(0,90),,0,90],(cross ply orientation). The figure 7 shows effect of changes in fibre orientations on modal density of composite plates made up of above mentioned orientations. From the figure 7 it is clear that modal density for cross ply and quasi isotropic orientation is lower than the unidirectional fibre orientation.
Figure 7.Effect of changes in fiber orientations on modal density of composite plates based on experimental test results the figure 6, it is clear that modal density of composite plate is lower than the conventional plates because of the damping property of the material . Similarly to observe effect of changes in fibre orientations on modal density of fiberglass composite plates, the modal density is obtained for E-Glass Epoxy (10% E-Glass fibres, LY556 Epoxy resin)[0],2(unidirectional orientation), [03,+/-45,90],(Quasi isotropic orientation), [(0,90),,0,90],(cross ply orientation). The figure 7 shows effect of changes in fibre orientations on modal density of composite plates made up of above mentioned orientations. From the figure 7 it is clear that modal density for cross ply and quasi isotropic orientation is lower than the unidirectional fibre orientation.
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Statistical Energy Analysis
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