FAA Begins Test Flights For Boeing's Troubled 737 Max

A Boeing 737 Max heads to a landing past grounded 737 Max aircraft at Boeing Field following a test flight Monday in Seattle. The jet took off from Boeing Field earlier in the day, the start of three days of re-certification test flights that mark a step toward returning the aircraft to passenger service.

More than a year after the plane's grounding because of two deadly crashes, the FAA began a series of certification flights Monday, a big step toward allowing the 737 Max to fly passengers again.

(Image credit: Elaine Thompson/AP)

News : NPR https://ift.tt/3dOipts June 30, 2020 at 10:42AM

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Solving Van der Pol equation with ivp_solve

Van der Pol’s differential equation is The equation describes a system with nonlinear damping, the degree of damping given by μ. If μ = 0 the system is linear and undamped, but for positive μ the system is nonlinear and damped. We will plot the phase portrait for the solution to Van der Pol’s equation in Python using SciPy’s new ODE solver ivp_solve . The function ivp_solve does not solve second-order systems of equations directly. It solves systems of first-order equations, but a second-order differential equation can be recast as a pair of first-order equations by introducing the first derivative as a new variable. Since y is the derivative of x , the phase portrait is just the plot of ( x , y ). If μ = 0, we have a simple harmonic oscillator and the phase portrait is simply a circle. For larger values of μ the solutions enter limiting cycles, but the cycles are more complicated than just circles. Here’s the Python code that made the plot. from scipy import linspace from ...

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