**Part A:**

*Strain Gauges:*

**Circular Gauge:**

Flipping strength | Minmun Voltage (volts) | Maximum Voltage (volts) |

Low | -2.5 | 4.8 |

High | -3.4 | 10 |

**Square Gauge:**

Flipping strength | Minmun Voltage (volts) | Maximum Voltage (volts) |

Low | -10.2 | 7.5 |

High | 8.32 | 12 |

**Part B:**

*Half-Wave Rectifiers*

**Number 1:**

**Number 2:**

Effective (rms) | Calculated (volts) | Measured (volts) |

Input | 7.64 | 7.52 |

Output | 3.44 | 5.39 |

**Number 3:**

To get calculated RMS value of the input we multiplied the peak by .707 voltage. And to get calculated RMS output we decided the peak by pi. The calculated and measured for the input line up well enough but not for the output we assume it's because the rectifier didn't fully remove the negative voltage signal.

**Number 4:**

Output voltages from above circuit:

Oscilloscope (volts) | DMM (volts) | |

Output Voltage (P-P) | 5 | 3.7 |

Output Voltage (Mean) | 6.5 | 6.28 |

**Number 5:**

Same output voltages from

*Num. 4*but with a 100 nanoF capacitor.

Oscilloscope (volts) | DMM (volts) | |

Output Voltage (P-P) | 0.24 | 0.0567 |

Output Voltage (Mean) | 7.17 | 7.16 |

**Part C:**

*Energy Harvesters*

**Number 1:**

Tapping Table:

Tap Freq | Duration (seconds) | Outout (rms mV) |

1 Flip/Sec | 10 | 242 |

1 Flip/Sec | 20 | 413 |

1 Flip/Sec | 30 | 513 |

4 Flip/Sec | 10 | 280 |

4 Flip/Sec | 20 | 742 |

4 Flip/Sec | 30 | 773 |

Tap Freq | Duration (seconds) |
Outout (rms mV) |

1 Flip/Sec | 10 | 230 |

1 Flip/Sec | 20 | 290 |

1 Flip/Sec | 30 | 640 |

4 Flip/Sec | 10 | 840 |

4 Flip/Sec | 20 | 1430 |

4 Flip/Sec | 30 | 1600 |

**Number 2:**

The longer that you tap it and/or the faster you tap it the more the circuit seems to store generate more voltage and hold that voltage for longer.

**Number 3:**

If we don't use the diode in the circuit then the strain gauge won't charge the capacitor at all.

**Number 4:**

For problem A I found that we have different values and graphs than what you have maybe because we have different ranges or we had a mistake in that part.

ReplyDeleteFor problem C from the graphs I found that we have same results even if we had different numbers.

Good job.

I think that this particular blog is going to be hard to get consistent values across blogs, as hard and soft are purely up to us to decide.

DeleteFor A and B we had similar data but we showed ours a bit differently. for B we showed the input and output on the oscilloscope picture to give a better representation. But for part C for 4flips/second our voltage decreased rather than increased like yours. we also had issues measuring the mean with the DMM, how did you guys calculate or measure that value?

ReplyDeleteWe calculated this by using the AC setting on the DMM and using it's value to find the RMS(mean) value.

DeleteOur blogs look very similar our values and our graphs both look similar. The only part that seems different is in part C you guys did both strain gauges we only did one. Were we suppose to do both?

ReplyDeleteWe thought we were supposed to, though I don;t think we ended up needing both.

DeleteNice work for this week. For part A, we almost have the same values for both flapping strain gauge and tapping strain gauge. For Q2 in part B, We had the same issue with the result of the output and the calculated output wasn't close to our measured input, I think that is because we measured the output before the rectifier remove the negative signal completely. Captions are missing for all tables and graphs.

ReplyDeleteThanks for the reinforcement on our data. We also fixed most of the tables and graphs.

DeleteGood job this week. The blog is pretty easy to read and the data tables and graphs are really well represented. The only difference I can see is how the Matlab graph increased for you guys, on the other hand it decreased for us.

ReplyDeleteInteresting that your Matlab graph decreased, do you think it could have been from a coding error?

Deleteno commenting.

ReplyDeleteGot there eventually!

Delete