I have shared ODS and Modal job animation videos in this forum to spark discussions. Check out the Frequency Based ODS Movies here: http://www.4xdiagnostics.com/s...frequency_based.aspx and Modal movies here: http://www.4xdiagnostics.com/s...s/impact_hammer.aspx. I am here to assist anyone engaged in or curious about ODS and Modal testing.
Thank you, Tony! One of the examples you provided aligns perfectly with what I was recently demonstrating to my newbies. - Aubrey
Tony, Your ODS works are quite remarkable. I would like to inquire about your modeling process - do you solely use MEscope or other 3D modeling software as well? When it comes to measurements, do you capture data at each joint or rely on interpolation for some? I often resort to stick (line) models due to time limitations. In your "Plunger pump and piping" case study, approximately how many triaxial measurements were taken? Thank you.
Hello Joe, thank you for your inquiries. The majority of my models are created using ME'scope. Everything showcased on my website's services page regarding ODS and Modal analysis was completed using ME'scope. Occasionally, I may import an AutoCAD 2D or 3D drawing into ME'scope and make modifications to better suit my requirements. I aim to keep the drawings straightforward while ensuring that the structural representation closely resembles the actual machine. When dealing with a rectangular structure like an A-frame or concrete base, I take measurements at each joint where two lines intersect on the drawing. For cylindrical structures such as motors or pipes, I take measurements in the X, Y, and Z directions at a cross-section, assigning them to the radius point and allowing the software to interpolate the remaining points. This method is suitable for lower frequencies where the structure remains rigid during vibration. For higher frequencies, such as 2000 Hertz, on a cylindrical object like a pipe, I would need to take measurements around the object as deformation is likely to occur at those frequencies. In a specific example with a plunger pump, I conducted tests at 450 points with three directional measurements at each point, totaling around 1400 measurements. This was necessary due to the complex piping system involved.
Hey Tony, I must say the ODS animations are quite impressive. As someone not well-versed in ODS or Modal analysis, I often ponder how ODS, which I assume only displays a machine's movements, can actually assist in resolving structural issues. It lacks the crucial information on nodes and antinodes needed to determine where reinforcement is required. MEscope offers advanced software solutions that can pinpoint the exact locations and amount of reinforcement needed to address the problem. The question remains: can we effectively tackle complex structural issues simply by visualizing machine movements? Modal analysis/ODS services tend to be pricier than most Pdm programs and demand a significant level of expertise. Regards, [Your Name]
Hello, VRG ODS testing is a powerful tool for detecting various mechanical faults and resonance issues in machinery, such as looseness, soft foot, broken welds, misalignment, unbalance, bending resonance modes, torsional resonance modes, structural weakness, and foundation problems. The ODS is capable of revealing all occurring issues on a machine, even if they are non-linear, like broken welds or loose bolts. By displaying antinode lines in the animation, ODS can provide valuable insights into the machine's behavior. While ODS animations may not always offer solutions to complex structural issues, they can help in understanding the vibrations, bending, or twisting of the machine, leading to ideas for structural modifications to avoid forced vibration frequencies. In addition to ODS testing, conducting a modal analysis can provide valuable information on natural frequencies, mode shapes, and damping values excited during the test. However, it's important to note that a Modal Analysis assumes linearity in the structure, which may not always be the case in reality. In order to address resonance issues effectively, a modal analysis followed by structural modification using modal software or assistance from a structural engineer for Finite Element Analysis (FEA) can be beneficial. After analyzing the ODS or Modal animations, it may be worthwhile to use mechanical intuition and industrial experience to explore modifications in mass or stiffness to move natural frequencies away from forced vibrations. While this approach may not always guarantee a solution to resonance problems, it can be a cost-effective and efficient method in some cases. Ultimately, the key is to follow a systematic diagnostic approach for addressing resonance problems, starting with route-based or standalone Spectrum and Waveform analysis, followed by ODS testing to understand machine deformations during operation. Structural bending or twisting identified in ODS testing may warrant a modal survey to identify mode shapes for natural frequencies. Collaborating with an engineer to utilize modal software tools for evaluating structural modifications or conducting FEA can further aid in resolving resonance issues effectively. In conclusion, a combination of diagnostic testing, ODS analysis, modal surveys, and theoretical/engineer solutions can provide a comprehensive approach to tackling resonance problems. It's essential to use available tools and expertise to fine-tune structural modifications and ensure a successful resolution to vibration issues. Feel free to reach out for further discussion or feedback.
Thanks for sharing these resources! As a mechanical engineer, I find ODS and Modal analysis incredibly fascinating. The concept of visualizing our machinery's response to various frequencies and impacts is truly insightful. Could you share some tips on how to interpret these animations more efficiently?
Thanks for sharing these videos! They're quite informative. I'm just dipping my toes into ODS and modal testing, but these visual aids make it a lot easier for a novice like me to understand the processes. By the way, have you ever conducted these tests in a real-world scenario? I'd be interested in hearing about your experiences.
Thanks for sharing these resources! As someone who's relatively new to ODS and Modal testing, these visualizations are extremely helpful in comprehending these complex concepts. I particularly found the Frequency Based ODS animations enlightening. I do have a question though - are there specific applications or situations where one testing method is favored over the other?
Thanks for sharing these resources! As someone who's relatively new to the world of ODS and Modal testing, these videos make the concepts much easier to grasp. The Frequency Based ODS video was particularly enlightening. I'm curious, how long does a typical ODS test take in an industrial setting?
Thanks for sharing those resources! I've been diving into ODS and Modal testing recently, and your videos are a great visual supplement to the concepts I've been reading about. The frequency-based animations are particularly helpful for grasping how mode shapes interact. I’d love to hear more about your experiences with these tests in real-world applications!
Thanks for sharing those videos! They’re a great resource for visualizing the concepts behind ODS and Modal testing. I find it fascinating how these animations can really enhance our understanding of dynamic behavior in structures. I’m curious, have you had any specific experiences using these techniques in your projects? Would love to hear more about practical applications!
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Answer: - ODS (Operating Deflection Shapes) and Modal job animation videos are visual representations of vibration analysis techniques used in engineering to understand the behavior of structures and machinery.
Answer: - Frequency Based ODS Movies can help engineers and researchers visualize the vibrational modes of a structure at different frequencies, providing insights into its dynamic behavior.
Answer: - Modal movies showcase the modal analysis of structures using techniques like impact hammer testing, helping engineers identify natural frequencies, mode shapes, and damping ratios for design and troubleshooting purposes.
Answer: - ODS and Modal testing techniques are commonly used in industries such as aerospace, automotive, and civil engineering to assess structural integrity, diagnose machinery problems, and optimize performance.
Answer: - Yes, beginners can benefit from watching ODS and Modal animation videos as they provide a visual introduction to complex vibration analysis concepts and techniques, making it easier to grasp fundamental principles.
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