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.
A region in space containing cargo which is distributed spherically so that the stocking load ρ is given by the equotations:
ρ = a for r<=R/2
ρ = 2a(1-r/R) for R/2<=r<=R
ρ=0 for r>=R
The total charge Q is 3*10^-17 C, the radius R of the overall distribution is 2*10^-14 m and a is a constant...
Homework Statement
(a) Copper has a breaking stress of about 3.00×108 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.37 mm?
(b) If 17 percent of this maximum load is hung from the copper wire, by what fraction of its original length will it stretch? Homework...
Hi. For a project of mine, I need a motor that can dole out and pull in a wire at a constant speed under a dynamic load. The load will be anywhere between 20-500 lbs. The speed will be about 1 ft/sec. Any idea about how I can achieve this effect? Is a motor even the right way to go or should...
I'm not sure where to post this, so please excuse me if this is misplaced. I need help understanding how the terms are grouped in this formula for A = pressure normal to the roof. If any of you are familiar with this formula or can link me to a source containing better expressed formulas like...
I'm doing some practice problems, and I can't seem to figure out where to even begin with this one.
I've tried solving for R_{T} (Thevenin resistance) by removing the 9V source and adding a 1V test source across the load, and I've also tried solving for R{_T} by leaving the 9V source in the...
Here's a question no one at present seems to know the answer to.
In "Talk Boxes" from the 70s they used a light bulb as a limiter to prevent overload to the compression driver that then sent the sound into the plastic tube you have in your mouth.
I put a 33uf cap in series with the + lead to...
Greetings,
I would like to build a circuit that would switch 2 separate AC power sources to a single load.
Here's what the circuit should do:
Circuit has single AC output to a system which utilizes AC current
Circuit has both a 120 VAC and 12 VDC input. 12VDC circuit is connected to an...
Homework Statement
http://img198.imageshack.us/img198/374/20856431.jpg
Homework Equations
Moment = R cross F
Couple moments?The Attempt at a Solution
I think I have to sum the moments from A, B and L all about C but I am not sure about the relationships between them.
In the event of grid failure islanding mode of operation of the electric generation unit is known as House load operation. Under this condition turbine generator produce only auxiliary load which is required to keep electric power plant unit alive. After restoration of grid the unit can be...
Ive made a spaghetti bridge for my grade 9 science class and I was wondering if anyone could help me find out how a static vertical load from the center my spaghetti bridge would be distributed along my structure to the edges. It is made entirely out of spahetti and hot glue and is designed to...
Homework Statement
A beams is 3.0m long, it rests on two wide supports. The support A is 0.5m wide. Support B is unknown. Point A is taken to be the end of the beam on your left.
Support A has a loading intensity of 75 N/m.
The load on the beam acts with a force of 300N, 2.0m from...
Is this too heavy a course load to take in the spring of my freshman year?
Calculus 3 - 4 credits
Honors Physics 3 - 5 credits
General Chemistry 2 - 4 credits
Intro to Diff. Equations - 4 credits
Some easy gened I have to take - 3 credits
That's a total of 20 credits. Physics 3 covers...
Hi Everyone,
I've been trying to find a load cell for a report and I need one with a maximum capacity of >200Kg and and accuracy of 10 grams or better (used in compression). I've taken a look on the web and the highest accuracy I can find is about 0.03% of the maximum capacity; which with a...
Homework Statement
for the thyristor circuit calculate the power in the load as a percentage of max power for a firing angle of 45^
Homework Equations
Va=Vm/2pi (1+cos theta)
The Attempt at a Solution
theta=arcos 0.707
45^=arcos 0.707
but as there is no value for VS or Vl i...
Hi,
I have this question that, how do we calculate the distance an IC engine can propel a vehicle for given certain conditions? And what would be those required certain conditions?
As a test case, i was looking at this engine:
http://www.yanmar.com.au/industrial/la_series/l48ae.htm...
Hi all,
I'm taking a Structures course in University and are learning about Freebody diagrams and figuring out Reaction forces (magnitude, direction, sense etc) and have a very basic question. Can someone please tell me how to convert a uniformly varying load into a concentrated point...
Hi all, my first post here so first, I'll say hello. Hello.
My question is this. I'm trying to figure out how to go about getting an approximate power requirement for an expanding light rail design. The idea is to figure out what it takes to propel a single self propelled train car based...
Hello, I am trying to make something that spins out of balance. currently my current weighs are half circle in shape. I know that if I change the profile of the weights to a pie shape (less than 180deg semi circle) the center of mass moves away from the axis of rotation, but at the same time...
Is there such a thing that can be bought? Are there schematics/BOMs to make one?
Reason I ask is that I'm designing a human-power generator (think bicycle with an alternator) and I need a way to test it. What I'd like is a "watt sink" -- a device that draws a set amount of power, independent...
Homework Statement
sir am new technician my boss told me that to find 3 phase power without off the machine . i have single phase clamp meter can measure voltage and current . how to find total power.
Homework Equations
\sqrt{}3* V line *I line * cos$
The Attempt at a Solution
find...
Is this a realistic class load considering I also do sports year round?
multivariable calculus
organic chemistry 1
physics 1
computational methods for engineers (matlab)
A load of 5kN is applied to the tensile member shown in the figure below and is carried at the joint by a single rivet of 20mm diameter. The angle of the joint is 60 degrees to the axis of the load (the axis of the rivet is at 30 degrees to the line of action of the load P). Calculate:
(a) the...
If I have a designed gear box that needs a motor to run , and according to my calculations the input power for the gear box must be 10 Kw at 10 r.p.s must I chose a motor with the same input specifications ?
when I buy a motorwith certain specifications like : 10 kw 3000 R.P.M , does these...
Dear all,
My objective is to find shaft load in which belt pulley is mounted and load being transmitted via belt.
In the case of two pulley belt drives ,the load to the pulley mounting shafts calculation can found by getting guidance in almost all textbooks(T1 &T2 relations). Where in my...
Will a bridge rectifier circuit without a filter or load resistor connected across its output deliver a pulsating unidirectional voltage ?
An oscilloscope trace (dc input enabled) did show a trace of a full wave output though the half sine did not swing down to zero voltage completely and...
I need to find a means to calculate the load on three or four ropes that are supporting a weight between them. These ropes radiate from the load at various angles, typically non-planer. The attached illustration shows a three rope example with the individual ropes, yellow, green, blue...
I would like to build an electric load simulator for testing purposes along the lines of this link:
http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4275198%2F4275199%2F04275321.pdf%3Farnumber%3D4275321&authDecision=-203
A salt box would work (I...
I am trying to do some preliminary calculations for a basic lifting device but some of my numbers seem to be out-of-wack. Could some kind soul take a look if you have a minute spare?
Motor Data (max efficiency)
RPM: 8311 = 870 radians/sec
Torque: 9.213N-cm = 0.09213N-m
Output Power = 870...
what are load calculations for a transformer?
A 44kv line is distributed into the industry using around 8 transformers 3750kva, 2500kva and 1500kva. What does this mean and what are the load calculations for this? Also how is it distributed?
Hey all, I'm starting my first year of university in a month or so, taking the specialist program (equivalent to honors program at my university) for pure mathematics. I am also going to take applied mathematics and physics courses, out of interest (hopefully I take enough physics courses to get...
I have a dough passing through a pair of rollers equipped with internal circulating chilled water.
given: mass flow rate, specific heat and temp in/out of the product
diameter of the rollers, its material.
temp. in of the chilled water.
problem: cooling load needed for the chiller.
Homework Statement
A piece of spaghetti 5 cm in length and 2mm in diameter has a weight of 0.2 gms. It will break under tension at a load of 5 kg (force). And its Euler buckling load is 500 gms (force). What length of the spaghetti could be suspended vertically from one end before it broke...
Hey, so there are three loads on a beam the units they are is in pounds (i.e. 7200pounds is one of the loads). There are two cases each for which I need to calculate reactions and draw bending moments and a sheer force diagram.
The PDF attachment contains the information in more detail help...
Hello,
I'm looking for a formula to determine the max load on a piece of Laminated Veneer Lumber (LVL) supported at each end. Although I've calculated the load on each component of bridges a thousand times way back in my Statics class, nobody ever showed us how to find the max allowable load...
Hi,
I'm sorry if there have been loads of posts about this, but I'm hoping someone can help me out here.
I'm making a pit to service a locomotive, this pit needs to be 10 feet wide (width along the rails), inorder to support the weight of the locomotive we have decided to run I-Beams under...
Hey Guys,
I'm new to the site and was wondering if anyone had any input on a good thermal/HVAC load software for commercial projects. I now Carrier makes a software but I'm wondering if there is a better one out there. Thanks in advance!
For an Intro engineering class we've working on a project to make bridges out of spaghetti. To determine if the different spaghetti components of my bridge are strong enough to hold the force that's being applied on them, I've been trying to calculate the spaghetti's critical buckling load for...
Homework Statement
An airplane flies through a horizontal curve at a speed of 250km/h (69.44m/s). Radius=0.7km or 700m
Find the load of the pilot on the seat if her mass is 67kg.
Homework Equations
centripetal acceleration=v^2/r
and then the solution times the mass of the pilot, but...
Calculating wind load is wind speed squared x .00431 x area in sq. ft. A 5 mph wind with a vertical 100 sq. ft. wing is 10.77 lbs. The mass of salt water is around 854 times greater than the mass of air. Can you use the wind formula and multiply by 854? Does the weight of water at different...
Calculating wind load is windspeed x itself x.00431 x sq. ft. of area. A 100 sq.ft vertical wing in a five mph wind is 10.77 lbs. The mass of salt water is around 854 times that of air. Can you use the wind formula and multiply by 854? Also, does this change with the weight of water at different...
I am going to start my sophomore year of college this fall. I will be 17 years old (just for reference purposes), and the state pays for me to go to college early given I stay within 18 credits per quarter, but I'm wondering if I'm going to be overloaded? My dad is a veteran electrical...
Can anyone please help me with a question re the minimum size square steel pipe needed to bear a load. I loved physics but never took mechanical engineering. I am rigging a winch to one end of a pipe to lift a static load (holding up a gangway temporarily to repair). The gangway weighs around...
I have a 3 phase 3 pole inductive motor with a VFD that is tripping the breker even before it ramps up. The breaker is set to allow its inrush current without tripping.
There is about 400 feet of wire between this motor and its busbar.
After a load filter was installed for this motor...
Ok, so here's my scenario/question. I am a technician that works on generators and does load bank testing on them. I'm having a debate with my boss about power factor and IF I'm wrong--I would like to understand why.
Today I load banked a generator that was rated at 25kVA and could run...
Homework Statement
Find the allowable axial compressive load for a 3in by 2in by .25in 17 S-T aluminum-alloy angle 43in long. It acts as a pin-ended column.
Assume: Factor of safety = 2.5
Least radius of gyration, r = .43
Area = 1.19 in^2
Homework Equations
17 S-T gives modulus of...
Hi,
I am using Sensored BLDC motors for some robotic movements. I am driving my motors using motor drivers. I am using ball screw mechanism for lifting a pedal up and down. On the pedal, there will be always a very high load, placed on it.
Now, my motor can lift up the pedal with my desired...