I am looking at one idea to passive vibration supression that involves "a resistive shunt to a piezoelectric material" but I can not find a lot of info outside of papers that I would have to pay for. does anyone know and can explain some detail about this method?
Homework Statement
I am trying to write a report that recommends hydro electric power as a future technology for Canada. I was looking for help in deciding what topics will make up the body of the report
Homework Equations
The Attempt at a Solution
for example,
Benefits of Hydroelectricity...
So the F_r component for example, it generates a moment about the xy plane because it has a moment arm to the xy plane? But doesn't it also have a moment arm to the yz plane?
can someone explain why this problem would involve two bending moment diagrams, one for the xy plane and another for the xz plane? Also, how are the reaction forces at B and C determined each time?
I found an explanation for the equation of under damped harmonic motion, x(t) = C cos(wt) + D sin(wt), but I was wondering if someone could further explain why:
 "However, if you assume the function x(t) is real, then they are related as A = B
 why is (AB) is imaginary
Homework Statement
##N= \frac{2 f_s}{f_{lowest}}##
##\frac{f_s}{2}  \frac{f_s}{N}##
Homework Equations

The Attempt at a Solution
I have these equations listed on a formula sheet but I do not know what they are used for. It is from a chapter titled "Discrete Sampling and Analysis of Time...
Homework Statement
In the attachment.
Homework Equations
Chart of pressure loss due to friction for steel ducts : http://postimg.org/image/4iml9x761/
The Attempt at a Solution
I don't understand the deltaP/L column of the results table.
Where did the values come from? Shouldn't they all be...
Homework Statement
Can someone why the voltage ##V^## is the same voltage as that of R2?
https://www.physicsforums.com/attachments/circuitpng.92144/ [Broken]
Homework Equations

The Attempt at a Solution
is it an application of KVL concerning the voltage for R1 and ##V^##
Can someone explain three wire and four wire RTD circuits in terms of how the lead resistances affect the voltage output
##V_o = \frac{R_3 V_s}{R_2 + R_3}  \frac{R_4 V_s}{R_1 + R_4}##
Also, in the case of a three wire, what is the purpose of Lead C?
Homework Statement
I have a lab on pressure control but I don't really understand the setup. I was wondering if someone could tell me what topics,chapters I need to read/look over to understand the network of valves on pg2.
Homework Equations

The Attempt at a Solution

Homework Statement
I attached the full document, buy I just want to know about :
"Using calibration procedure determine:
a) Sensitivity (mV/gr)
b) Overall instrument error (gr)
c) Linearity error %FSO
d) Hysteresis error %FSO
e) Precision error %FSO"
Homework Equations
The Attempt at a...
thanks very much for the reply!
I have another question
http://postimg.org/image/quz6smejb/full/
I don't really understand the basic conditions involving design/minimum volumetric flow rates to calculate reheat or to change the damper position. I was wondering if you could explain
Homework Statement
A factory has two zones. Zone 1 and 2 are both maintained at 75FDB. The design supply air flow rates to Zone 1 and 2 are 320 and 200 CFM, respectively. At a certain hour in summer, the cooling loads for Zone 1 and 2 are 6,000 Btu/hr and 3,000 Btu/hr, respectively.
Assume...
Homework Statement
A nominally linear electrical output force measuring device has the following manufacturer
specifications:
Input range : 0100 lbf
Full Scale output : 30mV
Temperature effect on:
Zero 0.002 % full scale/degrees Fahrenheit
Span 0.002 % of reading/degrees Fahrenheit
The...