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  • Users: boyze
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  1. boyze

    Rubber contraction simulation

    molding pressure can affect the result. In fact, molding pressure is used to counter shrinkage in some cases. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  2. boyze

    natural frequency for cantilever beam mounted on a vibration isolation pad

    Is the mode being excited by the motor 1P speed? Is the motor driving a pump or other device and if so how is the pump or other device attached to the motor? How is the system grounded? We have done many motor pump frequency surveys and have found that it's preferable to build a 3D model of...
  3. boyze

    natural frequency for cantilever beam mounted on a vibration isolation pad

    If you web search on "modal mass of a cantilever beam" and you should find a solution to the "modal" mass. You can then use k/m to find the modal k from fn. However, when you add another stiffness to the system the modal parameters will change. I.e., the mass at the fixed end contributes very...
  4. boyze

    natural frequency for cantilever beam mounted on a vibration isolation pad

    total beam mass isn't modal mass in this case which appears to be what you have assumed Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  5. boyze

    Eigen frequencies of a multiple span cantilever beam

    this might be of help Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  6. boyze

    Continuous beam deflection using method of superposition

    perhaps this could help Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  7. boyze

    Gleaning More Data From Newton's Law of Cooling

    I've had situations similar to this where I didn't know some of the thermal system parameters but had T(t) data and could make a reasonable assumption on the form of the thermal model. I used the "Solver" function in Excel to back out the unknown parameters. It's essentially a regression...
  8. boyze

    Strange question....

    Does the patent attorney need a detailed drawing? As others have pointed out that's usually not the case. In most cases a sketch is sufficient. Even a scanned hand sketch. Is the attorney actually proceeding with a filing having already searched existing art to make sure your idea is new art...
  9. boyze

    Calculation Troubles!

    ExcelE is equating the kinetic energy of the beam at impact to the compression energy of the planks after impact. k is the linear stiffness and x the total compressed deflection from the impact. The compression energy is the area under the load deflection curve. You can also get there by using...
  10. boyze

    Confusion with bolted connection

    This could be further interesting if you get into the tight bolt versus loose bolt scenario, ie. does friction play into this, sometimes labeled slip critical joints. And/or hole size and tolerance to bolt diameter, ie, will one of the bolts "engage" before the other at each end. For some...
  11. boyze

    Single DOF spring-mass-dashpot system excited by half-sine wave shock pulse

    Here's an extension (Drop Shock Calculator) of the Shock Response Online Calculator cited above. Had to do this for another project so might as well share it. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  12. boyze

    Estimating heat transfer coefficient in a forced convection oven

    perhaps I'm missing something. don't we need some more information like: - what is the creating the "forced" part of the forced oven or do we just assume a uniform temperature in each zone - is there something moving through the oven? if so, speed, size, surface conditions.... - if...
  13. boyze

    Dynamics of a series of springs

    I've run across this dynamics problem a few times in my journeys. I've seen a preload spring go into resonance on a shaker table and using a strobe light to watch the motion. It does act as a wave. We were able to match the behavior very well be using the same modeling approach suggested by...
  14. boyze

    Single DOF spring-mass-dashpot system excited by half-sine wave shock pulse

    This on line calculator maybe of help. Shock Response Calculator Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  15. boyze

    Euler Buckling

    this might help out online Euler buckling calculator Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  16. boyze

    How long will it take for heat to flow through this sample?

    examorph, one way to get the T coef is to run the cure curve for a few different cure temperatures on the subject material. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  17. boyze

    Help designing a simple vibration-isolator?

    who knew the RC world had such sophisticated strut systems :-) can you get spring dampers at the stiffness levels you're looking for? using the target 5 Hz and 300 grams the system stiffness is quite low. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  18. boyze

    Help designing a simple vibration-isolator?

    you mention that the RC devices have an oil damper - what is the spring element? a road surface is apt to be a random vib input environment unless it has some "regular" features and the device speed is constant. were the accel's on a "rigid" device traveling over the road surface? The...
  19. boyze

    How long will it take for heat to flow through this sample?

    examorph, sorry for the delayed reply - I've been traveling. Your assumption for SOC is correct for the simulation. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com
  20. boyze

    DO-160 Helicopter Vibration Query

    Wouldn't it depend on what is causing the specific response and it's fragility to that response and even other components to that response? Component A might be less durable to a lower response than component B to a higher response. Have Fun! James A. Pike www.xl4sim.com www.erieztechnologies.com

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