Typically, once you have created a solid model of a part or assembly, the next steps are to define boundary and operating conditions, then perform a finite element analysis FEA to identify the behavior of the part in response to those conditions. Influencing the accuracy of such analyses are the mathematical algorithms and actual coding of the analysis software, and the assumptions made throughout the problem definition process, whether based on geometry or physics.
Factors that influence these areas include available computing power, especially at the desktop level, and refinements in FEA algorithms in the newer analysis software packages. Thus, accuracy now stems from assumptions made in determining material properties; boundary conditions; geometry idealization; and physics simplification, such as flexible versus rigid behavior and linear versus non-linear behavior. Ideally, you would have continually improving sources of data on which to base the values for such input conditions.
Factors in mechanical test procedures Figure 1.
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To record the shape of the vibration response in this hollow aluminum cm diameter wheel in the shape of the Euro symbol, accelerometers were attached around the rim and parallel bars, and connected to dynamic signal acquisition devices on a PXI PCI eXtensions for Instrumentation platform. Test set-ups for a mechanical part or assembly involve best practices, years of experience, flexible hardware measurement systems, test and control software and input from the actual mechanical designer.
However, it can be difficult to tell if the test itself generated inaccurate data, since the following experimental parameters can lead to errors: sensor locations, sensor and system calibration, sensor adhesion, sensor mass loading, test fixturing free-free or constrained , excitation or loading locations, and load cycle.
With better sources of specific information for choosing these variables, the test results would be more reliable and provide better feedback to verify and improve the analyses.
Differences in tests and analyses Figure 2. Engineers analyzed this structure in the constrained mode for the natural frequency response in CosmosWorks. Analyses results can be viewed on the original 3D CAD models. They can be displayed as color maps representing small changes where you can rotate, zoom, and select any point, then read its corresponding value such as stress across the model.
For example, the output of a series of strain gauges is a stream of data, plotted as a set of superimposed curves on an x-y graph, with each curve tracking the measured values from a single sensor over time. An experienced viewer can pick out significant peak values or identify a trend of measurements from a sub-set of physically clustered sensors. What if the test results could directly, point-by-point, help calibrate and verify the approach to the analysis? You could compare an analysis with the test values to see when and where they differed.
If a subset of values were quite off the mark, this might indicate that a nonlinear instead of linear analysis would provide a more accurate approach. Conversely, what if the analysis could help test engineers determine the best locations for sensors and decide where and how to place the loads? Overlaying test locations on a stress distribution model would better support decisions of where to place the sensors — targeting key expected stress points — instead of attaching them in a simple grid pattern that might miss local areas of unusual activity.
To integrate test with design and analysis, four types of disparate information must be correlated: the 3D part geometry from the FEA mesh or the CAD model, analysis data, the physical location of each sensor, and the measured values taken from each sensor over time. Test data are usually sparse as they come from discrete sensor locations while FEA data are integrated over millions of individual elements. It would be useful to interpolate between the sensors to generate test values for every physical point on the model at a resolution comparable to that of an FEA mesh. Since every node on an FEA mesh can have a calculated and a measured value, correlated data sets would also let you generate error-map images comparing both values.
Figure 3. Mapping test data to the geometry and deforming it let the engineers see the test mode shape without a high-speed camera.
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The differences between test and analysis were displayed in the same view, along with a simple camera-image of the device under test for comparison. The views could be used to calibrate and improve the analysis prediction. Modal frequencies and mode shapes are often evaluated for structures operating in a dynamic environment such as an automobile or in industrial machinery.
The main concern is that the structure may vibrate excessively, causing it or other parts to fail prematurely. Vibrations may also transmit to other parts of the structure affecting the perceived quality of the system. The historical challenge in vibration testing is that in addition to requiring expensive measurement systems with high accuracy 24 bit and high sampling rates greater than k samples per second , the short dynamic nature of the event requires synchronized and sampled measurements at all the sensors accelerometers.
Another issue is where to place the sensors.
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You should be using SolidWorks motion which when you have the addin loaded, is a pull down option on the motion study There is a valvecam tutorial in the help to walk you through the interface You can control this under the motion study properties. How do I fix a part in a motion study? How do I fix a part in a motion study When I create a motion study and apply gravity in the proper orientation and "contact" between the plane and cylinder, both parts fall out of view immediately For more SolidWorks Simulation tutorials and content, visitGosimulation. It seems a little different to previous versions where the MotionManager appeared next to the ConfigurationManager and I can't find any tutorial help files - just the example projects in the COSMOSMotion folder - any idea where the help files are The motion manager is at the bottom of the screen above the status bar Is There a Book that???
I purchased Rob's book several weeks back and would highly recommend it for animation and basic motion studies Also Motion Simulation and Mechanism Design with CosmosMotion , but it is from that publisher who does not sell to customers so I don't have it Rotary Motor Direction. However, if you do not remember to Calculate the motion study , all that is happening when you press Play is that you are playing the previously calculated results This opens as an Animation motion study , but in the motion study tree there are two Solid Body Contacts This raises confusion because Animation motion studies are non-physics based and do not solve for contact Only physics based studies Basic Motion and Motion Analysis solve contact.
Motion Study is very slow for Geneva Mechanism. Motion Study is very slow for Geneva Mechanism While you can do a Geneva wheel as an Animation motion study , it is a lot of work to create the ten different mates required to have the pin move into and out of the slots Smooth Paper folding effect with Motion study. Smooth Paper folding effect with Motion study Can someone please guide me with a video tutorial or step by step procedure of how to achieve this effect.
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Simple Sliding Door How? Now I can select Basic Motion , which is fine then when I select motor I can select my object sliding door direction, horizontal edge - usually the door track , component to move relative to door track , I have also selected linear motor If you're just looking to animate, simple add one distance mate and in the motion study change it's value at different time interval For a sliding door or to stop an object in motion at any distance , use Min and Max distance in the Advanced Mates Here's the.
Sheet metal rolling on a core cylinder. Noobie here I would like to Basic Motion Motion Study a flat metal sheet toroll around a cylinder which is fixed on a stand Eg. GIF attached. The Most complex yet simple problem with animating path mate motor.
I am using Motion Analysis as I believe it is only possible to add such a path mate motor in that type of study and I amnot using gravity nor collision Also tried increasing to precise contact, maximum accuracy in the motion study options, it had no impact I've nearly watched every tutorial video on youtube now. Have a question or need help? Thank you for your feedback! Your comment has been submitted and will be reviewed by the MySolidWorks team.