5-4. The basic SDOF system of Fig. 2-1a, having the following properties, k = sec/in, is...

  

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5-4. The basic SDOF system of Fig. 2-1a, having the following properties, k = sec/in, is subjected to a triangular impulse of 15 kips and t= 0.15 T. 20 kips/in and m = 4 kips the form of Fig. 5-5 with po (a) Using the shock spectra of Fig. 5-6, determine the maximum spring force fsmax (b) Using Eq. (5-21), compute approximately the maximum displacement and spring force; compare with the result of part a. [19 ooooo k FIGURE 2-1 (a) m -v(1) -p(t) Phase I Po +7=1-1 Phase II Maximum response ratio Rmax 2.4 2.0 1.6 1.2 0.8 0.4 0 0 FIGURE 5-6 0.2 0.4 0.6 0.8 Ratio 4/1/ 1 T Rectangular Half sine wave 1.0 1.2 Impulse duration Period 1.4 1.6 Triangular 1.8 2.0 5-4. The basic SDOF system of Fig. 2-1a, having the following properties, k = sec/in, is subjected to a triangular impulse of 15 kips and t= 0.15 T. 20 kips/in and m = 4 kips the form of Fig. 5-5 with po (a) Using the shock spectra of Fig. 5-6, determine the maximum spring force fsmax (b) Using Eq. (5-21), compute approximately the maximum displacement and spring force; compare with the result of part a. [19 ooooo k FIGURE 2-1 (a) m -v(1) -p(t) Phase I Po +7=1-1 Phase II Maximum response ratio Rmax 2.4 2.0 1.6 1.2 0.8 0.4 0 0 FIGURE 5-6 0.2 0.4 0.6 0.8 Ratio 4/1/ 1 T Rectangular Half sine wave 1.0 1.2 Impulse duration Period 1.4 1.6 Triangular 1.8 2.0