Iphleandro-blog - Real

iphleandro-blog - Real

More Posts from Iphleandro-blog and Others

6 years ago
The “Squidworm” Is Believed To Be A Transitional Organism From Benthic Worms To Free-swimming Pelagic

The “Squidworm” is believed to be a transitional organism from benthic worms to free-swimming pelagic worms.  They are named Squidworms due to their tentacle-like branchiae and palps.

(source)

6 years ago

Here is a semester project in the 2012 Mechatronic control systems engineering module at San Jose State University. This is a Proportional-Integral-Derivative controlled (PID), 6 degree of freedom (6-DOF) Stewart platform, which basically means it has six axes on the top plate. This prototype uses 6 radio controlled servo motors instead of the traditional use of hydraulic jacks or electronic actuators. (this video has sound)

Proportional-Integral-Derivative:

A PID controller continuously calculates an error value as the difference between a measured process variable and a desired setpoint. The controller attempts to minimize the error over time by adjustment of a control variable, such as the position of a set of servo motors or actuators,  to a new value, given by a weighted sum:

image

where Kp ,Ki , and Kd, all non-negative, denote the coefficients for the proportional, integral, and derivative terms, respectively (sometimes denoted P, I, and D).

P accounts for present values of the error , and is determined by the direction and magnitude the correction needs to be applied (e.g. if the error is large and positive, the control variable will be large and negative),

I accounts for past values of the error (e.g. if the output is not sufficient to reduce the size of the error, the control variable will accumulate over time, causing the controller to apply a stronger action through P), and

D accounts for possible future values of the error, based on its current rate of change. This part determines when and at what rate it needs to reduce the magnitude of its action, e.g as the ball fast approaches the desired set point at the centre of the plate.

[source]

6 years ago
Entelodonts: Terrifying.

Entelodonts: terrifying.

Shown here compared to a modern pig skull on the left. (Entelodonts were actually more closely related to whales and hippos than pigs.)

6 years ago
Heteromorph Ammonites With Spikes (Emericiceras Alpinum, Ancyloceras Vandenbecki, Emericiceras Barremense)

Heteromorph Ammonites with spikes (Emericiceras alpinum, Ancyloceras vandenbecki, Emericiceras barremense) Cretaceous, Lower Barremian -  Agadir, Morocco

7 years ago
6 years ago
Cute Animals ♥

Cute animals ♥

6 years ago

no fucking way

7 years ago
6 years ago
Horseshoe Bend, AZ. Watched The Sunset And It Was Everything I Could Have Hoped For On A Roadtrip. [6000x4000][OC]

Horseshoe Bend, AZ. Watched the sunset and it was everything I could have hoped for on a roadtrip. [6000x4000][OC] https://ift.tt/2Ppvm1A

Hey Tumblr! I found an awesome travel contest that I want to share with my followers. Travel for free to France, The Netherlands, Switzerland, or Serbia. Just click here and read my blog for more details!

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