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In this tutorial, we will learn the basics of performing motion analysis using COSMOSMotion. Although the tutorial can be completed by anyone with a basic knowledge of SolidWorks parts and assemblies, we have provided enough detail so that students with an understanding of the physics of mechanics will be able to relate the results to those obtained by hand calculations. Begin by creating the six part models detailed on page 2. For each part, define the material by right-clicking “Material” in the FeatureManager and selecting “Edit Material.” The Materials Editor will appear, as shown here. Select “Alloy Steel” from the list of steels in the SolidWorks materials library. Click the check mark to apply the material. Open the part “Wheel.” From the main menu, select Tools: Mass Properties. The mass properties of the wheel are reported in the pop-up box. For this part, the weight is 40.02 pounds, and the moment of inertia about the z-axis (labeled as “Lzz” in SolidWorks) is 609.3 lb?in2. Note that if you centered the part about the origin, then the properties, labeled “Taken at the center of mass and aligned with the output coordinate system” will be identical to those labeled “Taken at the center of mass.” Since the wheel is symmetric about the axis of rotation, it will be difficult to visualize the rotational motion in the model. Adding a non-symmetric pattern to one of the faces of the wheel will be helpful. Scroll down in the Force PropertyManager and set the value to 12 in?lb. Scroll back to the top of the PropertyManager and click the check mark to apply the torque. Select the Results and Plots Tool. In the PropertyManager, use the pull-down menus to select Displacement/Velocity/Acceleration: Angular Velocity: Z Component. Click on the front face of the wheel, and click the check mark. Resize and move the plot so that both plots can be seen, and format the plot as desired. In this exercise, we will model a 4-bar linkage similar to that of Chapter 11 of the text. In the text, we were able to qualitatively simulate the motion of the simulation when driven by a constant-speed motor. In this exercise, we will add a force and also explore more of the quantitative analysis tools available with COSMOSMotion. Construct the components of the linkage shown on page 2, and assemble them as detailed in Chapter 11 of the text. The Frame link should be placed in the assembly first, so that it is the fixed link.
Tags : moment of inertia, angular velocity, axis of rotation, mass properties, hand calculations, pull down menus, alloy steel, materials library, rotational motion, center of mass, motion analysis, solid modeling, select tools, coordinate system, basic knowledge
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