What is Load: Definition and 1000 Discussions

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.

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  1. marellasunny

    Engine map with load curve in 5th gear:fuel consumption varies weirdly

    http://imageshack.com/a/img824/2641/1cpe.png The black curve I drew there represents the load curve in 5th gear. Why is it that at 5500 rpm(160kph), I have a lesser fuel consumption(270g/kWh) than at 4000 rpm(280g/kWh)? Intuitively,if I produce more power at 180kph(ie 5500rpm),I should...
  2. T

    Why is the natural frequency of a column at the buckling load?

    So apparently the natural frequency is zero for uniform column with axial load when P is equal to the critical buckling load. Could anyone please explain theoretically why this is the case.
  3. P

    Induction Motor Torque Decreasing when Load is increased

    Hi. Having measured an induction motor on no load and obtained a torque figure, I have noticed that when load is increased, the torque continues to decrease. How it this possible as I am observing a reduction in rotor speed and increase in rotor currents and current drawn from supply?
  4. P

    Induction Motor Slip decrease with frequency decrease for same load.

    Hi, Does anyone know or could help me understand the reasoning for the amount of slip within an induction motor decreasing with frequency under the same load conditions? I.e. For no external load, the slip is higher at 50Hz than at 20Hz etc? Thanks
  5. H

    How to calculate maximum load of the box

    Hi I attached the file. there are 3 different types of forces applied. and material's yield strength is 55.1 MPa or 8000 psi. I want to find maximum load of box for each types. I don't know which equation I can use. because the box is empty. the dimension of box is width: 70mm, length...
  6. Illuvitar

    Transferring from Community College to University: Balancing Course Load

    Well from what I understand when a student transfers from community college to a university they start with a fresh GPA. Its kind of worrying me that by the time I transfer I will have all of my general eds out of the way and will have only engineering courses every semester till graduation. I...
  7. A

    Partial distributed load over fully fixed beam

    I am trying to figure out the deflection in a fully restrained beam. A diagram of the beam can be found here on this website. http://civilengineer.webinfolist.com/fb/fbcalcu.php I have been able to find the reactionary forces as well as the moments at each end of the beam for any distributed...
  8. B

    How to reduce a distributed load to a resultant force

    Hi everyone, So I am trying to study how different types of slurry will deflect a PVC pipe. The first step in my understanding is to reduce distributed load into a resultant force. I'm assuming that the resultant force will be placed in the center of the pipe (assuming a homogeneous...
  9. M

    Designing a Pneumatic Arm to Lift 5kg Load 10m

    Hey I want to build a pneumatic arm that can throw stuff around (see attachment image). Before actually ordering the stuff i want help with some calculations. i want the arm to be able to push 5kg load (rectangular shaped) straight up into air. the arm/plunger area that makes contact with...
  10. W

    How Can I Get GIFs to Load and Move in Android ImageView?

    I added the ImageView to the layout but it does not move. What do I do to make it move for a certain amount of time?
  11. D

    Balanced Three Phase Star Load

    http://i59.tinypic.com/727ole.jpg My answers http://i59.tinypic.com/mkzvqp.jpg Can some see if I am going in the right direction, thanks.
  12. A

    MATLAB How to control power source base on load condition in Matlab/simulink

    hi i'm using Matlab/simulink to create a microgrid model which simulate dynamic control of power based on the loads. the loads are changing based on the realtime. I use several voltage sources to power the loads. I would like to be able to turn on/off the generator based on the loads. for...
  13. S

    Reactions of a redundant frame structure using Unit Load Method

    Homework Statement Hi, I am having trouble with the following problem and I can't seem to find any examples: I am trying to determine reactions at points A and D of the redundant structure below using the unit load method, there is a 10kN load at the top left point (B), all lengths are...
  14. Q

    Inductive Load Over-Correction: Explained Mathematically

    I am looking for an explanation of why over correction of inductive loads can result in large circulating currents. Many sites give some form of vague verbal description but I have not been able to comprehend this phenomenon. Can anyone explain it mathematically or provide a link that...
  15. C

    Did I make a mistake in my moment calculation for the distributed load?

    Referring the question and my own worked out solution in the attachment, I could not get to the answer given that is Ra= 200 N, and Rc = 1300 N. Is there any calculation mistake I made?
  16. A

    Calculating the load current and load voltage

    Homework Statement Attached. Homework Equations The Attempt at a Solution Attached. For #2, how do I get VL and IL?
  17. P

    Transformer Current Drops with Load

    Hi, I have observed that as the load applied to a transformer secondary is increased (i.e. Increased Impedance), the current drawn by the transformer seems to decrease. Is this purely due to the fact that because the voltage remains fairly constant and the impedance is increased, the current...
  18. T

    Schools Does Course Load Really Matter for Grad School?

    Hi, I'm a sophomore undergrad and recently I've been wondering how much weight grad schools in the sciences actually put into your "course load." I've read some conflicting views on the internet, books on grad school admissions, and faculty. The websites for some grad/professional schools list...
  19. C

    Moment diagram with triangular load

    Homework Statement For the overhanging beam in the figure, A) draw the moment diagram indicating all critical values including the maximum moment (Value and location), and B) write the moment function, M(x), for B-C section in terms of x coordinate as shown in the figure. Homework...
  20. B

    Maximum Load question given Safety factor

    Could i get some help with this one please The ultimate strength of a round steel rod is 620.000 MPa. If a factor of safety of 3.000 is required, what is the maximum permissible load for the rod if it has a diameter of 3.000 cm?
  21. E

    Selecting a Smaller Resistive Dummy Load for 2.5 Watts

    Hey guys. I need a resistive dummy load that can handle 2.5 W, but I need it to be much smaller than a 2.5 W resistor. I have looked for different ideas, but I need it to be simple like a resistor and smaller than a 2.5 W resistor. Any ideas?
  22. M

    Analyzing a Multi-storey multi-bay frame subjected to lateral load

    What is the best/easiest method I can use to get the deflections of a 5-storey, 3-bay frame subjected to lateral loads only? I've used the Elemental stiffness matrix for two-dimensional frame analysis (giving me a 60 x 60 matrix) but I'm getting the wrong deflection values. I think my procedure...
  23. Hercuflea

    Can you assess my course load this semester?

    Hi guys this semester I am graduating this semester with a math degree and I am for sure taking these four classes: 1. Real Analysis 1 2. Numerical analysis 2 (differential equations/pde's, more advanced methods than numerical methods 1) 3. Electrodynamics (griffiths) 4. Spanish...
  24. Z

    Determine working stress and greatest allowable load

    "Determine working stress and greatest allowable load" Homework Statement The maximum load in a tensile test on a mild steel specimen of diameter 12.5 mm is 95 kN, calculate the ultimate tensile stress. Also, determine the working stress and greatest allowable load on a rod of the same...
  25. medeek

    Snow Load Calculator | Medeek Design

    Finally finished up the snow load calculator. Moved it to this page: http://design.medeek.com/resources/snow/snow_calculator.pl Give it a whirl and let me know what you think. I wish there was an easy way to calculate the ground snow loads for a given location but unfortunately there...
  26. Q

    Calculating Load for a Mini Wind Tunnel?

    Hey guys, so I'm building a mini wind tunnel and I would like to calculate the new RPM,HP and Torque since the propeller will act as a load and change the specs of the motor(note I'm using a air wrench as the motor as it's all I had around and have disabled the impact motion) the current specs...
  27. S

    How much load is going through the bolts

    Hey guys. Im building a special type of squat rack for my gym, and need some input on the bolts to use. I have used high tensile M16 bolts on all joints, but am not sure if it is enough, hence me joining this forum and asking you guys. Attached is a picture, and Ill explain the lines I've...
  28. K

    Calculating Beam Load Proportionality with Point Loads

    Supposed you have a beam supported by 2 columns at the beam ends. At the middle of the beam, let's say there is a point load, the weight shared by the 2 columns is 1/2 each. How about if the point load is in the 3/4 portion of the beam, what is the corresponding share of each column of the...
  29. L

    What is the relationship between stress and load for a 19mm shaft?

    I have been given this question by my teacher as part of a quiz and I'm confused on how to start. 1. Calculate the maximum working tensile load that a 19mm shaft is able to take with a safety factor of 3. Material UTS 470 Mpa 2. Stress = load/area When it states 'area' what is this the are of...
  30. anthonyk2013

    Finding load in compound bar

    A cast iron pipe is filled with concrete and used as a column to support a load W.If the outside diameter of the pipe is 200mm and the inside diameter is 150mm, what is the maximum permissible value for W if the compressive stress in the concrete is limited to 5 KN/m2. Take E for concrete as...
  31. R

    How can I determine the maximum load on a surface?

    I'm trying to determine what equations I can use in order to calculate the maximum load (in pounds) across a sheet of plexiglass. Could anyone help me look in the right direction? This is just a sheet that's 10" x 10" x 1/8", that's held by 4 screws. You see, my project involves placing my...
  32. TheFerruccio

    Buckling Load of Simply Supported Beam + Midpoint Transverse Spring

    Alright, I took a while setting this problem up for you guys, because I am absolutely stumped and have hit a brick wall and have nowhere else to turn for assistance. Please excuse the shoddy diagram. I made it from scratch to try to illustrate the problem better. Homework Statement Find the...
  33. M

    Calculating Cooling Load of a Car Engine: Where to Begin?

    Homework Statement hello friends,i have to do a project about calculations of cooling of a car engine.i don't know what to do or where will i start.can you offer me some links or books about this area please.how can i find how many wats of heat, say, a 100 kw engine, releases. Homework...
  34. S

    Transmission Line Length for Real Input Impedance?

    Homework Statement Hey guys. I have a transmission line with a known characteristic impedance (50 Ω) of length L that is connected to an antenna that has a complex impedance of (50-j25)Ω. I am having extreme difficulty determining the minimum length (expressed in wavelengths) of line such...
  35. P

    Calculating Force R: Distributed Load Homework

    Homework Statement http://postimg.org/image/7vpxry28t/ Can someone explain how they calculated the force R representing the distributed load? Did they even make use of the value "800N/m" from the question?
  36. S

    Why is there more than 1 value for load W where there is no rotation?

    Homework Statement The problem along with its solution is attached as TheProblemAndSolution.jpg. Here is the textual part of the attached image: “In Fig. 1 a 20 ft-frame PQ is supported at two points L and M, 6 ft and 4 ft respectively from the edges. If a 300 lb load is attached to edge...
  37. B

    Load Impedences - Rectangular to Polar

    Homework Statement Can you simplify rectangular expression 1/j30 + 1/10 + 1/(15-j25) The answer is .134 angle(28.07) Homework Equations The Attempt at a Solution I got = 1/j30 + 1/10 + 1/(15-j25) = -j.03+.1+.06+j.04 = .16 + j.01 = .16 angle(3.57) The...
  38. O

    Mixed Resistive Inductive load

    hello i do have something unclear about =.. POWER Real Power Reactive Power Inductive Load 500 511 W 329VAR 1.2 400 519W 312VAR 2.0L 300 490W 382VAR 3.2L IS ABOUT MIXED RESISTIVE INDUCTIVE LOAD.. MY...
  39. G

    Electrical Engineering - FET Common Source Configuration with Load

    Homework Statement I'm given this configuration with a AC source at v_{i} with a R_{sig} connect to the source before the capacitor. R_{sig} = 0.6 KΩ R_{G} = 1 MΩ R_{D} = 2.7 KΩ R_{L} = 4.7 KΩ I_{DSS} = 10 mA v_{p} = -6 V Homework Equations The Attempt at a Solution...
  40. P

    Load Power Factor in Power System

    If you have a purely resistive load, which is connected to the generator via elements such as (transformer, transmission line etc), will the load power factor still be unity or 1.0 (In theory)? Or do the previous components such as transmission line etc affect the load power factor? Many Thanks...
  41. R

    RCC structures and load bearing walls

    In modern buildings (I'm talking about taller structures, apartments, etc. not houses) that have a reinforced concrete framework are the internal / external walls (usually brick, masonry etc.) ever load bearing? In the sense is the strength / integrity of the structure ever depending or...
  42. J

    Question on lvd, and load cell output

    Hello, I graduated last year for mechanical engineering and have a project that i am working on at home that i need some help on with the electrical part. what i am trying to build is a shock dyno, i need to measure force and velocity, i plan on using a lvt and a load cell unless someone has a...
  43. L

    Gear train torque / power and load?

    Homework Statement This is a final hurdle of a long question designing a simple gear train. That is done but now am not sure of my calculations for power in / out and torque in and out, so hopefully someone can help? OK - I have 4 spur gears inline, Gear A = 100 rpm 80 Teeth (input motor...
  44. M

    Statically indederminate bar undergoing axial load

    To be honest, this problem was gone over symbolically in my discussion session, but I didn't fully understand it. I am having difficulties using the superposition method (or even force method) to solve these problems where a load is applied on the bar and it is constrained at both ends. I don't...
  45. K

    Reactions at beam ends when varying load position - clearing doubts

    Homework Statement Well actually we were doing a beam experiment in class. It consisted of varying the position of a load and measuring the reactions to eventually analyse the relationship between the distance of load from 1 support with the 2 reactions. The reactions were provided by two...
  46. D

    Worst load cases lattice structure

    Introduction Dear all, I'm working on an assignment to model a ship-to-shore crane for a FEM design course. Having modeled the crane, I now need to apply the load of the trolley (which is hoisting the container) on the boom (which in my case is a lattice structure made up of beam elements)...
  47. C

    Change in length of wire after adding a load

    Homework Statement Please refer to the image attached. I don't understand why can they just take 1.8m as the original length, since there is already a load hanging there. My calculations yield the value of strain to be e/L, but in the answer it is e/1.8. Please explain this to me. Homework...
  48. 1

    Calculate Maximum Load of a Beam

    Homework Statement The bar 1 in the figure has a cross-sectional area of 0.75 in^2. If the stress in this bar must be limited to 30 ksi (30,000 psi) determine the maximum load that P that can be supported by the structure. Homework Equations σ = F/A τ = Fd The Attempt at a...
  49. H

    Use of alternate energy to load a gun

    Can someone help me regarding a concept in gun mechanism?? In the current mechanism a part of the chemical energy of the gunpowder is used to load the next bullet.Had this energy not been used to load , would it increase the range of the gun?? and if so, then is the increase significant??
  50. Y

    Older Photoshop won't even load in Win 7

    I am trying to load a very old version of Photoshop 6.0 into my Win 7 computer. It won't even install, it just stopped. Is there any compatibility mode I can make it work? Thanks Alan
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