Modal analysis of solid rocket motor is carried out in FEM with MSC/Marc. Two models to simplify the characters of the propellant .which is difficult to be described in FEM,are adopted. In the first model,only mass of the propellant is considered,and treated as concentrated mass distributing on FEM ...
Modal analysis of solid rocket motor is carried out in FEM with MSC/Marc. Two models to simplify the characters of the propellant .which is difficult to be described in FEM,are adopted. In the first model,only mass of the propellant is considered,and treated as concentrated mass distributing on FEM nodes of the motor's case, other attributes,such as stiffness,are ignored. Another model is a 3D FEM model according to the propellent's geometry, mass and stiffness are considered. FEM modal analysis and modal test are compared,and found that, the fist model can simulate the bending vibration characteristics of the motor, except that the breathing vibration characteristics for the ignoring of the stiffness. The second model is ideal for both bending and breathing vibration characteristics. And it is found that calculation error increase for higher order mode,so the elastic modulus of the propellant must be modified larger to get the calculation more closely correlated with the test results.
Modal analysis of solid rocket motor is carried out in FEM with MSC/Marc. Two models to simplify the characters of the propellant .which is difficult to be described in FEM,are adopted. In the first model,only mass of the propellant is considered,and treated as concentrated mass distributing on FEM nodes of the motor's case, other attributes,such as stiffness,are ignored. Another model is a 3D FEM model according to the propellent's geometry, mass and stiffness are considered. FEM modal analysis and modal test are compared,and found that, the fist model can simulate the bending vibration characteristics of the motor, except that the breathing vibration characteristics for the ignoring of the stiffness. The second model is ideal for both bending and breathing vibration characteristics. And it is found that calculation error increase for higher order mode,so the elastic modulus of the propellant must be modified larger to get the calculation more closely correlated with the test results.
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