Rayleigh damping, modal damping, composite damping. The n x n symmetric damping matrix c is formulated as a linear combination of the mass m and stiffness k matrices. The solidworks simulation premium dynamics course includes topics for time. What is the different between modal damping vs rayleigh damping. Pdf modal analysis of a small savonius aerogenerator by using. Modal damping vs rayleigh damping solidworks forums. The system free motionwithout damping described by the eq. Equation 2 you can define rayleigh damping for linear and nonlinear dynamic studies.
By applying the modal coordinate transformation, the modal damping matrix c becomes diagonal. Must have attended the basic solidworks simulation premium class, or have similar experience with solidworks and working basic knowledge of finite elements, basic mechanical principles and basic principles in vibrations. Using the ansys technical manual and checking through other sources, ive been able to come up with the equations used to determine the rayleigh damping coefficients. For linear dynamic analysis modal analysis we can use either of these damping options but for nonlinear analysis, we must use rayleigh damping because for nonlinear we do not calculate the resonant modes. Values of rayleigh damping coefficients in nonlinear dynamic simulation aluminium question asked by david barbado on mar 18, 2017 latest reply on mar 18, 2017 by alessandro tornincasa. Modal analysis of a small savonius aerogenerator by using solidworks. The type of damping described by equation 1 is known as rayleigh or proportional damping. Equation 1 the type of damping described by equation 1 is known as rayleigh or proportional damping. There are 2 ways we will look to define damping in a solidworks dynamic study. The global damping matrix is constructed as a proportional combination of the mass and stiffness matrices, for example. I know that i need the frequences in order to calculate propperly. This 4day class, created for solidworks simulation premium users, will raise fea skills to the next level. Must have attended the basic solidworks simulation premium class, or have.
Uniform and nonuniform base excitation in the time. For rayleigh damping, the inputs required are an alpha and a beta constant. On the other hand, the rayleigh damping constants in the dynamic analysis will be tuned considering the dominant vibration shapes in our example. Solidworks simulation premium dynamics central innovation. For many cases, damping effects are adequately described by equivalent viscous dampers. Passive vibration damping solidworks motion youtube. By applying the modal coordinate transformation, the modal damping matrix c. This course is targeted for the users who would like to become productive in analyzing structures subjected to. Rayleigh damping, modal damping, composite damping load vs. The first part of the course will teach you the basic and advanced topics in nonlinear stress analysis.
Solidworks simulation premium dynamics training course. Vibration analysis with solidworks simulation 2015 request pdf. This form of c is orthogonal with respect to the system eigenvectors. My problem is that i always seem to get a significantly larger alpha coefficient than beta when using the natural frequencies of my models. Using experiments in solidworks motion, a bode plot and plain theory to analyse a situation of passive vibration damping. Users who would like to become productive fast, the advanced course offers handon experience on the use of the solidworks simulation dynamics module including with solidworks simulation premium.