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  1. Dikuza

    NX: How to ignore touching pairs in Clearance Analysis and only review for hard interferences?

    Hello, I'm trying to run clearance analysis (NX 2212) however is extremely slow due to the large assembly and analysis including "soft" and "touching" pairs, resulting in over 1000 instances, 90% of which are face-to-face mated components. How can I ignore these and check only for hard...
  2. Dikuza

    Steady-State (Static) vs Dynamic Acceleration. What's the Difference?

    @comcokid, I appreciate the response but yeah it's definitely not jerk. As Greg pointed out, this would make the units g/s and also is never really accounted for in actual analysis as far as I'm aware
  3. Dikuza

    Steady-State (Static) vs Dynamic Acceleration. What's the Difference?

    Regarding the design of spacecraft structures, what is meant by "static" and "dynamic" acceleration? Any help is much appreciated! Launch vehicle providers always include a table of Spacecraft Design Limit Load Factors in their user guides to use for spacecraft preliminary design. For...
  4. Dikuza

    How to Analyze and Size Spacecraft Structures: Loads Development & Structural Dynamics

    Hello, I'm a mechanical/aerospace design engineer trying to expand into structural analysis. What I'm looking for: A guide or summary as to 1) how spacecraft design loads are determined, and 2) how components are analyzed to these loads Recommended course to learn the above Ideally, I'd...
  5. Dikuza

    Help Understanding Limit Load and Margin of Safety

    @Ng2020, this is what makes the most sense to me. It's a bit misleading then to show the same Limit Load in the calculation for MoS, when this is actually the stress DUE TO limit load...
  6. Dikuza

    Help Understanding Limit Load and Margin of Safety

    @sdm919, thanks for taking the time to respond. I don't think this really answers my question though. To put it another way, how can Limit Load be used in the determination of both test loads and design margins? If this is the max load/stress the part will see including calculated internal...
  7. Dikuza

    Help Understanding Limit Load and Margin of Safety

    Hello, I'm a mechanical design engineer wanting to expand more into structural stress analysis and looking for some clarification on the determination and use of limit load, test loads, and margins. My question is what actually is Limit Load and how are Margins calculated? See examples below...
  8. Dikuza

    How to Approximate Aerodynamic Coefficients

    Hello, this is a very specific question so any help is much appreciated! GOAL: I'm trying to get a first-pass analytical approximation for the lift and drag coefficients for hypersonic flow over a blunt-body capsule spacecraft (similar to NASA's Apollo or SpaceX's Dragon) during atmospheric...
  9. Dikuza

    Online course/resources to learn mechanical stress analysis

    I found a copy of Niu's Airframe Stress Analysis 2nd edition (written in 1999), is this really the best place to start as opposed to something newer/more readable? Thanks
  10. Dikuza

    Online course/resources to learn mechanical stress analysis

    @rb1957, are you referring to Steve Niu's Engineering Analyses and Best Practices or Michael Niu Airframe Stress Analysis & Sizing (is this too specific to airframes only if I'm looking to just get started and something generic?)?
  11. Dikuza

    Online course/resources to learn mechanical stress analysis

    Hello, I'm looking for online courses/resources (either free or inexpensive) to learn general stress analysis. My work experience so far (6 years) has been in Aerospace design and have been referred to Roark's, Shigley's, and Bruhn's text which I've started reading, however, these are very...
  12. Dikuza

    NX11 Batch Assign PMI to Multiple Similar Parts

    NutAce, I appreciate the response and this was actually my first thought as well. However, it's much easier for me to create all the parts first then try to apply PMI, as opposed to create one and save-as several times. What I would like to do is essentially copy/paste the PMI to the other parts...
  13. Dikuza

    NX11 Batch Assign PMI to Multiple Similar Parts

    I have several (50+) parts that are all essentially rectangular plates of varying size with a few holes of different locations. I'm trying to minimize the amount of repetitive work when it comes to getting these made. My thought was to avoid making drawings entirely, and do this through...
  14. Dikuza

    NX8.5 Iterate Dimensions Until Condition Is Met. Journal: "Invalid attempt to load library&quot

    Any other alternative than the Optimization command, which I do not have a license to? Someone has to have written a Journal to iterate a dimension through some range until a specific condition is met?
  15. Dikuza

    NX8.5 Iterate Dimensions Until Condition Is Met. Journal: "Invalid attempt to load library&quot

    Taylor, That sounds perfect! Is this the same the topology optimization? Unfortunately I don't believe we have a license to this feature, do you know what license it is included in? Thanks!
  16. Dikuza

    NX8.5 Iterate Dimensions Until Condition Is Met. Journal: "Invalid attempt to load library&quot

    Hello, I'm wondering if there's a way to iterate a specific dimension through some given range, until a user-defined condition is met? For example, I would like to iterate the length of a line in one of my sketches until a specified distance is measured between two bodies. If this is not...
  17. Dikuza

    HELP! Motion Simulation Dynamic Analysis

    I'm trying to set up a model in NX8.5's Motion Simulation to run dynamic analysis and am having trouble determining the resultant forces/torques. What is the best method to go about this? For example, if I have a simple system of two mating gears with a torque applied to one, when I try and...
  18. Dikuza

    HELP! NX Motion Simulation Reverse Solver

    Hey all, I'm wondering if there's a way in NX's Motion Simulation to reverse solve a system for a given input/desired output I think of this similar to Excel's "Goal Seek" function in which you set a specific cell to a particular value by automatically changing another cell. For example, I...
  19. Dikuza

    How to Prevent Assembly From Opening Children Parts

    Hello, I'm working with a large assembly using Component Groups. My Assembly Load Options are set to: Use Partial Loading Use Lightweight Representations Load Structure Only When I load one of the Component Groups, NX physically opens some of (but not all) of the parts/subassemblies listed...
  20. Dikuza

    Toggle Display of Sketch Dimensions On/Off

    Other than displaying everything as PMI and hiding PMI Dimensions (which seems to slow down my model), is there an easy way to quickly toggle the display of sketch dimensions? I'm trying to design a mechanism by mapping it through sketches, and would like to see it without the dimensions, but...

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