A structural load or structural action is a force, deformation, or acceleration applied to structural elements. A load causes stress, deformation, and displacement in a structure. Structural analysis, a discipline in engineering, analyzes the effects loads on structures and structural elements. Excess load may cause structural failure, so this should be considered and controlled during the design of a structure. Particular mechanical structures—such as aircraft, satellites, rockets, space stations, ships, and submarines—are subject to their own particular structural loads and actions. Engineers often evaluate structural loads based upon published regulations, contracts, or specifications. Accepted technical standards are used for acceptance testing and inspection.
Dear all,
I am stuck with a problem where I must show that the lowest critical load converges to a certain value if the number of elements increases(see figure) I can assume a certain set of numerical values for the beam properties.
For 2 elements(1rotational spring) I have...
Greetings; I am a firefighter so physics is pretty much Greek to me. I work primarily as a rope rescue/USAR tech. We work a lot with rope, pulley's, and anchor points. All of these systems have angles that affect the loading in our system. Now I been taught rules of thumb when constructing a...
Homework Statement
Homework Equations
Time Avg. Power = \frac{|V0+|^2}{2*Z0} [1-|\Gamma|^2]
for line of l=\frac{λ}{4}+n\frac{λ}{2} (where n=0 here), Zin=\frac{Z0^2}{ZL}
The Attempt at a Solution
Bit confused what to do in the 1st part? I know that max. power is delivered to load when...
I just realize my new laptop has no CD or DVD drive. I need to load anti virus and other programs in. I know all I need is to go and buy a USB DVD drive. But is there any way for me to copy the content of the DVD or CD into a USB flash drive using another computer. Then plug the flash drive into...
I came across a diagram of a release mechanism, which shows the operator how to double a release load. I have taking a basic physics course (not advanced) and I can't seem to make any sense of this. I am just trying to understand this diagram; is it correct? Sorry for the drawing; hopeful that...
Homework Statement
Determine the load impedance for the circuit depicted in fIG 11.40 if the source is operating at a PF of (a) 0.95 leading: (b) unity: (c) 0.45 lagging.
Homework Equations
uploaded
The Attempt at a Solution
uploaded. I am not really sure what to do please see...
It's been a while since I had my last circuits class, so I'm just looking for some verification on my calculations. I have a series of lights that I want to combine to 1 circuit (if possible).
Each light fixture has 2 bulbs, and I have a total of 12 fixtures, meaning 24 bulbs. I am using...
I started by getting the equation for the reaction(which is really simple). I'm a bit confused here, they're asking for the absolute maximum moment, but they're not locating the location of where the maximum moment will occur, should I assume it's happening on the middle of the beam? And another...
I started by getting the equation for the reaction(which is really simple). I'm a bit confused here, they're asking for the absolute maximum moment, but they're not locating the location of where the maximum moment will occur, should I assume it's happening on the middle of the beam? And another...
Is there a physicist who has discovered this, and could you explain how he/she did it?
I was trying to find it on the internet, but it only gives me a lab review of load vs efficiency.
thank you
Homework Statement
Need to know the bearing load for a linear slide I'm working on, two spaced bearings with an extended load off the end of the slide.
Homework Equations
What equation do I need to apply? What examples are out there?
The Attempt at a Solution
I am trying to simulate the inrush current in a transformer when it is at no load, using the software Powerfactory.
I get the Magnetization current, and it is what I was expecting.
But I get confused when I draw the phase current, because as the trafo is at no load... should not be the same...
Homework Statement
This is a question refer to a transistor in a common emitter configuration.
And this is the table with data of Vce and Ic at certain range of Ib stored in microsoft excel, and the graph is plotted within the file attached(in another tab)...
Hello All,
I am in the process of creating a 33' tall chaotic pendulum, and cannot find any calculations for the buckling strength of pipe. The pendulum swings from side to side, but is stopped as it goes too far one way or another by a limiting cable attached to a sleeve over the pendulum...
Homework Statement
Homework Equations
ƩFy=0
ƩM=0
The Attempt at a Solution
Finding the reaction at A:
ƩFy=0: A + (L*w0)/6 - (L*w0)/2 = 0
A = (L*w0)/3
ƩMA=0: MA - [(L*w0)/2]*(L/3) + [(L*w0)/6]*((2L)/3) = 0
MA = (w0*L2)/18
For the shear and bending moment:
ƩFy=0: (L*w0)/3 - (x*w0)/2 +...
What is the definition of "Engine Load"
A lot of things I have read make reference to engine load but it is not clear if there are different meanings.
One definition seems to be that the engine load is the amount of air flowing through the engine as a percentage of the theoretical maximum...
Hi all,I just started to learn mechanics so please forgive me if i ask something elementary.I have an example from Egor P Popov's Engineering mechanics of solids.(Please refer attachment and sorry about quality of drawing).
This is a problem of a pin joint system subjected to vertical load...
I am looking to find the reaction forces on the bottom of the rectangular shape I have included (sorry for the crude diagram). I have a moment on the top right beam (390600 lb/in) and a distributed load of 160 lb/in across the entire surface of the top of the rectangular prism. I am looking...
The DDR3 1333 is relatively cheap, so I'm thinking about buying a server mobo that can stock up to 64 GB of RAM (2^64 enables that many address lines, I suppose?) Then I can pre-load the entire windows into the RAM, so :
Advantages:
super-groovy and sweet just to think about
lightning fast...
OK... so my understanding is that a DC generator under no load generates high voltages without any current, but does the same hold true for an AC alternator?
What happens with current when the RPMs of the alternator exceed what is necessary for the current requirements?
Hey guys, I am new to the forum and came to here to ask for help on a project that I am trying to construct.
I have 3 lithium polymer batteries, one 7.4v, 11.1v, and 14.8v. The current draw will be around 150a for an extremely short period of time (a couple milliseconds) and then will settle to...
So I've got myself set up for a pretty daunting first year. My courses:
Calc I
Phys Calc I
Gen Chem I
CPSC Programming Engineers
CPSC Engineering Graphics
English I (Actually very hard)
Now I think I'd be able to pull off a decent/good GPA if I sacrifice my life completely...but I...
Hello, I am trying to calculate the permanent load on a slab of 1.6m x 1.4m x 0.05m stainless steel that is part of a structure of 8 plates.
The structure is a rolling bridge, link below
http://1.bp.blogspot.com/_-zOrAL1V5Jg/S6XanJMpPXI/AAAAAAAADhU/a86tki4c_YY/s640/rolling+bridge+1.jpg...
I have a N-ch Mosfet load switch that connects to a WiFi module on a circuit board.
When the switch is turned OFF, I still see a voltage of 1.4V at the load.
Ckt attached.
I decreased the bleed resistor from 1k to 100 ohms. The off voltage decreased to 1.1v.
This doesn't happen with other...
Homework Statement
In the circuit shown, a load having an impedance of 39 + j26Ω is fed from a voltage source through a line having an impedance of 1 + j4Ω. The rms value of the source voltage is 250V.
a) Calculate the load current IL and voltage VL
b) Calculate the average and reactive...
I currently attend a quarter based college in Washington. My adviser suggested taking Diff. Eq's, Linear Algebra, and Physics Waves and Lab in one quarter. Would this be a good idea or not? I am smart, but not a Sheldon Cooper lol. Any advice would be much appreciated!
How does one go about triggering a switch (i.e. relay) via a resistive load in an AC circuit? For instance, if I have an AC relay (high impedance) and put the coil in series with the resistive load, it won't work: the resistive load will stop working. How does one go about triggering a relay...
I should be able to calculate the MOE and MOR after a four point Bending test in lumber wood. I have all the data for develop a plot load versus deflection. The data provided was: load, cylinder, string and bridge. I have been doing the plot using the bridge as deflection, but I didn´t get the...
Hello,
From what I've read in the stickies, this question may be more suited to this homework forum, although please note I'm not a student nor is this homework (it's simply for a personal project I'm doing), so please accept my apologies in advance if there are significant gaps in my...
Hi everyone,
For current project at work I am looking into possibility of simulating deformation from impact with static force.
Here is the input data:
A ball of 0.5 kg at speed of 25 km/h crashes into a damping foam which is placed on a rigid wall. Stopping (deformation) distance in the foam...
Homework Statement For the circuit shown, what value of ZL results in maximum average power transfer to ZL? What is the maximum power in milliwatts?Homework Equations
P max = (VTh)2/4RL
Thevenin, Norton procedures, voltage division, current division, etc etc
The Attempt at a Solution
This...
Homework Statement
consider the following circuit:
a) Determine the value of the resistor, R so that a current of 0.5 A flows through the load.
b) What is the maximum value of th load resistor?
c) If the load resistor is 10Ω, what value of VB will put the transistor into saturation?
Homework...
Hi everyone,
quick and hopefully simple question,
I was wondering is it a bad/good idea to take one or two courses in the summer to have a slightly reduced courseload during the school year?
And how does this affect chances of graduate school and scholarships etc?
Thank you!
Firstly, does a stress vs. strain graph for a material always take the same general shape as its load vs. extension graph (with the same important points, e.g. UTS, having the same shape and corresponding to the same thing)?
Secondly, what do the stress-strain and load-extension graphs look...
Homework Statement
An Unbalanced 3-phase star connected load has the details as below.
Line Voltage=400V
Voltage R-N = 230V 0°
Voltage B-N = 230V +120°
Voltage W-N= 230V -120°
Impedance R-N = 100+J36
Impedance B-N = 102+J0
Impedance W-N = 50+J0
A.) Determine the neutral...
I recently took a crash course that included some topics in fluid mechanics. I learned that you can use the concept of impulse and momentum the calculate the force of fluid, for instance a jet of water on a turbine blade. The equations used are:
ƩFx = ρQ(Vx1-Vx2)
ƩFy = ρQ(Vy1-Vy2)
I...
Homework Statement
Simple question: is the effective voltage of an idealised full-wave rectification not simply the rms voltage, as it is with the original AC waveform?
Backgound...
In an electrical apprentice program I am being instructed to use average DC voltage to calculate power in a...
Homework Statement
From the average power consumed by the lamp in a light dimmer circuit connected to 240V AC main,
What is the expression for RMS voltage,
calculate the range of values of the delay angle α,(i)RMS voltage (ii)RMS current in the lamp, (iii) the average power if its nominal...
Hello there,
I am wondering if some specilalist would point in me in the direction of procedures to determine the load in a fiber in a composite material made of aligned fibers (let's say at alternating angles $$+/- \alpha$$).
I understand you could simply compute the strain in a convenient...
Homework Statement
A transformer has 400 primary coils and 200 secondary coils. The primary voltage is 200 V, and the current is 2 A. A lamp is connected to the secondary coil. The efficiency of this transformer is 50%. Find the resistance of the lamp.
Homework Equations
V=IR
η=P in / P out...
Hi there attached is a task where i had to calculate the value of the load using kirchhoffs law I would be grateful if someone can check this to see if its correct, its part of an assignment question.
Hello,
I have Omega made load cell with 150g capacity,Rated output 2mV/V, Excitation 10V.How I can convert voltage values to the force (Newtons)?When no force applied meter shows 0,06V and then i pressing with finger the max value I get is 0.7V.So how I can converts those volts to Newtons now?
Homework Statement
I have got this scheme:
Alternating voltage V = 120 V,
Total resistance of wires Rw = 0.6 Ω
Current is 100 A, ratio 1:5 and 5:1 (as we can see it in the scheme)
Have to calculate dissipated power in the load (Pl), dissipated power in the wires (Pw), total dissipated power...
Hello,
I've been playing with transistors on a circuit simulator and found that it doesn't matter on an NPN transistor whether I put the load on the collector or emitter side, the load still has the same current flowing through it. The same is true for the PNP transistor, however when I...
Is there a mathematical equation for calculating the load angle of a generator?
I'm trying to calculate the real and reactive power of the generator which the equation I am using is
EV/Xd sin delta
where E is the generator excitation voltage
V is the generator terminal voltage
Xd is the...
A balanced 3 phase load is rated at S=10KVA and 500V. The device is operating at 90% nominal voltage and 100 % line current.
The question is:
if the load is delta connected, find the phase current in per unit and SI units.
I calculated correctly that the per unit line current value is...
I have a partial linearly distributed load on a cantilever and would to determine the bending moment distribution along the beam.
I usually do this by taking cuts along different sections of the beam and finding the expressions for shear force and bending moment. However when I do this...
First, I am not an electrical engineer and am not to familiar with circuit boards.
PROJECT: I have a static load, represented by a block. The block has three very short legs (or feet 3/8" diameter each). The feet are located concentricly under the block. Under the feet I place three thin-film...
Which wood cross sectioπ caπ carry hïghest uπiform load
Homework Statement
Homework Equations
Moment of inertia for rectangle I=(1/12)bh3
τ=(VQ)/(I*b)
σ=(MV)/I
The Attempt at a Solution
I started by finding reactions at B and C
Then drew the sheer and moment diagrams (to save...