Typical applications for FEA includeLinear Elastic Analysis Non-Linear Non-Linear Material Models Non-Linear Large Displacement Non-Linear Multi-Body Contact Dynamics Fluid-Structural Interaction (FSI) Impact Fatigue



PMI has experience on a wide variety of CFD projects with flows ranging from quiescent, buoyancy-driven flows to hypersonic aerodynamics. We routinely use advanced modeling techniques including deforming meshes, multiple species and User Defined Functions (UDFs) to provide optimal solutions

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PMI provides field measurement services to define the motion of objects or systems. We have the instrumentation and trained staff to assess the motion of almost anything, from a single small object to complete building/soil systems. Closely linked to these

Recent News

Should you Perform Nonlinear Stress Analysis?

Should you Perform Nonlinear Stress Analysis?

Apparently I still need to learn how these blog posts work, I think they’re not supposed to have abstracts… Abstract: This post is a medium length (14 pages) exploration of the differences in results that occur when a lifting lug finite element model is analyzed using linear and nonlinear techniques.  From the results presented it is shown: The ASME BPVC is unclear on which stress limits should be applied to a non-pressure retaining component using linear analysis techniques, and For the geometry considered, the rated load for the lug is significantly increased when nonlinear techniques are applied. The post is written at a mild technical[...]
Is a Square or Triangular Pitch Better in 2-Phase Flow?

Is a Square or Triangular Pitch Better in 2-Phase Flow?

PMI is frequently asked which tube arrangement is better for shell-and-tube heat exchangers with two-phase flow on the shell-side: square or triangular pitch?  The short answer is: that’s an interesting question.  To shed some light on the shell-side flow patterns within the tube bundle, let’s take a look at two models. Geometrically, the models have the same percentage of flow space blocked by the tubes ~30%. The test sections are designed to model the flow characteristics, with no heat transfer, near the center of a typical bundle. The models are analyzed using two-phase flow physics with gravity. The two species considered were: water (r[...]
Damping Evaluation

Damping Evaluation

In engineering, the damping ratio (ζ) is a dimensionless measure describing how oscillations in a system decay after a disturbance.  One way to evaluate the damping ratio is to excite the system and then use what is called the log decrement method to evaluate the damping.  Figure 1 illustrates the log decrement method. Unfortunately, real systems don’t always behave in a way that allows clear use of the log decrement.  Figure 2 illustrates the motion of a tall (~80 m) exhaust stack that is excited and then allowed to vibrate freely. The vibration signal has been filtered to remove all but the[...]
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