![]() The new functionality facilitates adding a third physics, such as heat transfer, and even additional physics beyond that. You can start with a single-physics model, either structural mechanics or fluid flow, before adding the fluid-structure interaction, and you can disable a physics interface in an already coupled model to solve for only one physics. On the fluid side, all turbulence models are now available as well as a number of new boundary conditions.Īdditionally, you have more flexibility when building and solving a model. On the structural side, many additional boundary conditions and material models are now available for FSI analysis for example, rigid domain, piezoelectric, and nonlinear elastic material models. ![]() With this approach, all functionality in the constituent physics interfaces is available for fluid-structure interaction (FSI) modeling. The new coupling matches the modern style, with a number of single-physics interfaces and multiphysics nodes to couple them together. New Fluid-Structure Interaction InterfaceĪ new Fluid-Structure Interaction multiphysics coupling has replaced the interface used in previous versions of the COMSOL ® software. Additionally, in the Bolt Selection subnode, in both 3D and 2D axisymmetry, you can now specify a relaxation of the bolt predeformation, which can be a function of time and loading history, for example. By necessity, the bolt is located at the axis of revolution for 2D axisymmetric cases. ![]() The Bolt Pre-Tension feature can now be added in 2D axisymmetric components for the Solid Mechanics interface. Note the example of the settings in the Bolt Thread Contact node. The bolt to the right is modeled using the new bolt thread contact condition, whereas the bolt to the left is joined to the bolt hole using a continuity condition. Since there are two such voice coils, both acting in the same direction, the total coupling factor for the new motor structure will be identical to that of the traditional design."Ī shorting ring is added on the former between the two wound voice coils to provide Xmax braking.Comparison of stress normal to a cut plane through the bolts. Each of these thinner coils will then have a coupling factor of 0.5(Bl)2/RE, or one-half that of the traditional driver. In addition, the masses of the two thinner coils will equal that of the single traditional coil. The coils are scaled so that they are one-half the length of the traditional coil. Two reversely wound coils are used, each using wire with one-half the cross-section width as before. In a Differential Drive topology there are two magnetic gaps that have opposing flux fields, and each gap has a B field equal to that of the traditional design. These quantities establish the value of (Bl)2/RE, which is the electromechanical coupling factor of the driver. The coil has an electrical resistance, RE. "In the traditional design, magnetic flux density B crosses a gap in which a coil of wire of length l is placed. A very musical solution for modest Mms, modest Xmax woofers. JBL's Diffrential Drive speaker motor uses both poles of a NdFeB motor to create an N-gap which powers a right-wound voice coil and the P-gap which powers a left-wound voice coil, which summed together cancel out the generated inductance. Click to expand.Another no-copper method of reducing motor inductance.
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