Recent content by jblc

Q: How do you find the phase between an input and output signal? These signals are swept-sin (chirp: https://en.wikipedia.org/wiki/File:Linear-chirp.svg) signals for system identification, so I'm looking to find a transfer function. Background: A frequency-domain Transfer Function's magnitude...

"If the only reliable information is the measurement update at each instant, why use a KF at all?" Wouldn't that still count as a kalman filter? We can still estimate the new state without a measurement, from the previous state's propagation, and make an estimate from that alone. The associated...

Ah, I see, that is more clear now. You explained that better than other sources I read, thanks! To verify that i understand, say that an object to be tracked in position/attitude is experiencing an un-modeled disturbance--say an unknown force and torque. --> For the KF to work best, a sensor...

Exactly, I'm referring to the sensor fusion example where the gyro angle rate refers to the same angle that the two accelerometer axes can measure due to gravity. It's a redundant measurement. "The basic idea is that the gyro readings are used in the dynamic model to predict the rotation angle...

right, as mentioned this was a simplified and constrained 1D case with just 1 gyro, just for learning purposes. I agree and realize that an actual IMU requires 3. The sensor measurement model was the z=Cx part above, or are you referring to something else? I thought i had both the measurement...

While trying to learn kalman filters, I see contradictory info for a simple gyro State Space representation. Please be patient with this post, I've put a fair bit of time trying to make it easy to follow and read! My goal is to understand how a moving IMU's orientation can be found. I'd...

Okay, let's say I have the flow, and this is superheated steam. How does someone calculate the density of superheated steam? When is something superheated steam, as opposed to just hot moist air? Is it above a certain temp, eg 150 C?

By air velocity, I'm referring to the flow rate of a gas. For example, if V m3/hr of gas passes through an opening of area A, the gas velocity V = X / A. Yes, to find RH I need to know water content, of course. I do know how much water is transferred the air, but I need to know how much air...

Thanks, I actually started with that link when learning about this. I can't use their Moist Air Density calculators because they require either RH or Dew Point; and I can't find RH (or dew point) without air velocity, but I need Moist Air Density to find velocity in the first place. Dry Air...

I've spent hours trying to understand conceptually how to find the density of moist, hot air at high temperatures, eg at 600° C. Any help would be great. This is not a homework problem, but I'm preparing for a problem i will likely encounter shortly at work, and thermo is outside my specific...