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. A

    Load Acting on Robot Arm Driven by Electric Motor

    Hello all I have a doubt with the load concept acting on a beam. Consider a robot arm, actuated using Electric motor. When the arm is static and hold in position by the motor, Does the Gear ratio reduce the load acting on the motor due to the Gear ? Or when the arm is static, the Gear system...
  2. UMath1

    Mechanical Advantage in absence of resistance or load

    I want to understand what happens to the energy inputted into a simple machine if there is no resistance or load. For example, let's say you have a U-shaped tube of water with greater surface area on the left side. If a piston applies pressure to the left side and there is no piston on the right...
  3. R

    Flywheel that will simulate a load of .104 slug-feet squared

    Any one can help with the following, i need to know the weight and radius of flywheel that will simulated a load of .104 slug-feet squared, calculation base in friction
  4. G

    Find Load in AD, BD, and DC: Solving Homework Questions

    Homework Statement I am asked to find the load in AD, BD, and DC... I have AD(2/surd38) +BD(2/surd29)=800 AD(3/surd38)=DC I can only formed two equation... But , so many unknown... How to solve this? Homework EquationsThe Attempt at a Solution
  5. G

    Moment about distributed load (trapezium)

    Homework Statement i am asked to find the reaction at A and B ... Here's my working : 15(3/2) +15(5) +15(6)+5(6/2)=RA +RB moment about A = 15(3/2)(3x2/3) + (15)(5)(8) + (5x6/2)(8+4) + (15)(6)(14) -RB(14) = 0 so , i have my RB=148.9N , RA= 53.5N , which is wrong ? which part of my working is...
  6. Dr. Lollipop

    Is doubling up on Physics and Math majors too much for a sophomore?

    I'm a sophomore Physics major, and I'm considering double majoring in Physics/Math. So I've looked over the classes I need to take, and next semester requires me to take Modern Physics, Differential Equations, and Applied Probability-Statistics. To be honest, I don't know much about what Modern...
  7. B

    Max Load Capacity of Rack Built from 2x2x.25 Steel Tubing

    I am trying to determine the capacity of this shelf i am building out of 2x2x.25 steel tubing. My only real question as of now, is let's say its 4ft wide and 8ft long, if i put a support every 1ft, does that mean when determining the max capacity i could treat it as several sections? guess what...
  8. R

    Calculating load per unit length

    I am having the hardest time calculating q, the load per unit length. This question is in relation to my previous question I posted here. I have a cylinder laying horizontally that is fixed on its ends. The cylinder is filled with water. To calculate the deflection I am simplifying the problem...
  9. J

    What is D.F and How to Calculate It for Transformer Load?

    I have seen an excel sheet in calculator to calculate the size of transformer. There are option to put the vales of Kw,PF,Qty and Equipment D.F. I could not understand what is D.F. What is the equation to calculate the D.F and equation to calculate the total load D.F?
  10. cnh1995

    Reactive Load and Alternator Speed: Exploring the Relationship

    A motor driven alternator connected to local load (in lab), say a lamp bank, slows down due to power consumption by the load I.e. nonzero power angle δ. But should it slow down when δ is zero i.e. with purely reactive load(like in SC test and ZPF test)?
  11. David Gin

    Compressor Water Cooled Chiller Thermal Calculations

    Hi All, Is there a list of thermodynamics equations regarding the chiller process from condenser, evaporator, compressor to the regulator. Say I have chiller load at 90%, what set of equations could I use to determine the supply temperature of chill water and condenser supply temperature to...
  12. D

    Understanding 25GNDY/14.4kV Notation for Three Phase Transformer Banks

    Homework Statement [/B] What is the maximum full-load primary current that you could safely design for a three phase 500 kVA transformer bank to provide if it has a high-voltage winding of 25GndY/14.4 kV? What does the notation 25GNDY/14.4kV really mean? Is it 25kV three phase and 14.4kV...
  13. A

    Thin Load Cells for Small Weigh Scale Project

    Hi, I'm doing a project and an looking at building a small weigh scale and measure about 40lbs max (even lesser is ok as I'm learning). I'm looking for load cell thickness of 5mm or less (:smile:). I've one kitchen scale that I opened but that load cell is bigger. I looked at the web and found...
  14. K

    Understanding KVL Loop in BJT Biasing and Calculating Ve: A Guide

    Please help how Ve is calculated what i think is that it should be: -Ve=-Vee+IeRe; How Ve is taken positive please someone draw equivalent circuit for same
  15. O

    The Physics Behind Applying Force with a Load Cell

    We are applying a force with a machine that has a dial that measures lbs. P=F/A We have 5 blocks with a combined area of 20 in^2 and we want to apply a pressure of 35 PSI to them. Therefore F(total) for the entire Area is ~700 lbs. This is what the machine reads. If we put the load cell on...
  16. H

    Which rating of generator i can use for 07KW load

    Hello friends, I am doing my collage project in which main concept is to produce electricity from speed backer and want to use this energy for street light. now my que is my total load will be max 0.7 KW and i have no more idea about generator selection so can you please suggest the generator...
  17. B

    Induction Generator at no load

    Hi all, Assume a standalone synchronous generator feeding power to a single induction machine which is made to run as induction generator at super-synchronous speed without any external electrical load connected to the machine busbars. What will be the behavior of the induction machine under...
  18. Pula

    Batteries for Beginners: Sizing and Charging for a 1600W Load

    Hi, I have just got into the battery industry and i would like to understand a few things especially when it comes to sizing a battery. For example: if i have a load of 1600W and the system voltage is -48V DC (for a telecom application). The main supply is AC which is converted into DC through...
  19. Roman Kozak

    I Load on a Horizontal Wire (Zip line)

    I am creating a horizontal zip line, in which a rider will be pulled with a rocket engine. Completely serious. One end of the wire will be secured to a tractor and the other to a large tree. The zip line will be made from 12.5 gauge (2 mm) galvanized class 3 200 KPSI minimum tensile strength...
  20. A

    Axial Deformation due to Temperature Change and Load

    Homework Statement A 100 kN load is applied to a flange positioned midway (at B) along a 50 mm diameter steel bar (ABC). The bar is placed between two rigid supports and is thus constrained. Determine the position of the flange (distance from the left support) if the temperature of the bar...
  21. M

    Load on a beam: More unknowns than equations?

    Homework Statement Homework Equations FBD and all forces and moments = 0 The Attempt at a Solution Sketched in the image. So, I don't know how to go on with my analysis of the load, since I can't determine the reaction forces. Can someone please help me? Thanks in advance!
  22. M

    Beam statics: continous load analysis

    Homework Statement I just don't understand how to set the problem for the free body diagram (point (a) and (b)). Can someone help me with this problem? Thank you in advance.
  23. rizwanibn

    Understanding Household Connected Load: Demystifying Your Electricity Bill

    Recently when i checked the electricity bill ,i found that the connected load was 200 Watts. How come it be when i use my 450W computer, 1000W iron box etc. Even the light bulbs and fan add upto more than 200W. Please comment. Thanks...
  24. B

    Is My Advanced Math Course Load Manageable for Senior Year?

    I'm currently a high school student. For background, I finished Calc BC soph year and I've taken Calc III, DE, PDE, Lin. Alg, and an intro to proofs course this past year at a local 4 year university (earned A's in all). I'll be a senior next year taking Real Analysis, Intro to Geometry, and...
  25. Finesagan

    Would you say my course-load is overwhelming?

    Hello I am going to be a Sophomore in the upcoming fall semester. For the past couple of days I have been trying to decide if I should take another math class next semester. I am passionate about both math and physics so the lack of humanities does not bother me and honestly I am happier in the...
  26. H

    Centrifugal Force load caused from propeller rotation

    Is anyone interested in telling me the force created from 2 propeller blades rotating 2000 rpm.The total diameter of the prop is 72 inches and the weight of 1 blade is 4 lbs. Reason for the question is I want to mill a clark-y profile the length of the blade less ,4 inches for a bolted...
  27. F

    Why ultimate load is less than yield load?

    i have made a beam with both ends fixed. when I apply load at center then the ultimate load will be 8Mp/L=8fyz/L which came to be 440KN My question is how to calculate the load at which beam starts yielding? I have used E=200000N/mm2 and initial yield strength=220N/mm2
  28. R

    A 270-kg load is lifted......

    Homework Statement A 270-kg load is lifted 21.0 m vertically with an acceleration a=0.150 g by a single cable. A)Determine the tension in the cable. B)Determine the net work done on the load. C)Determine the work done by gravity on the load. D)Determine the final speed of the load assuming...
  29. James1907

    Load Calculation for Hollow Pipe (OD-320mm,ID-310mm,Height-600mm,MS)

    Can you please help me out to find out the load that a Hollow pipe can withstand. OD-320mm ID-310 mm Height-600 mm Material -Mild Steel How much load can it withstand? Your help will be appreciated.
  30. GrassCube

    Vertical Beam under eccentric Load

    Hi, I've been trying to solve a problem which i don't even know how to approach. I have a vertical hanging cylindrical beam (free to swing sideways but not around itself), the beam is subjected to an eccentric load, downwards, at the bottom of it. The load is parallel to the swinging plane (it...
  31. S

    Effect of Increase in Load Torque on Belt Tension & Power

    Homework Statement What would be the effect on the following if the load torque is increased and the speed maintains constant: a) the tension in the tight side of the belt b) the tension in the slack side of the belt c) the power transmitted Homework EquationsThe Attempt at a Solution I...
  32. B

    How to determine side load for 4x4 metal pole?

    I need to be able to support a variable side load up to a maximum of about 250lbs at 10' high. I am planning on using a 14' 4x4 steel pole that will be anchored 4ft in the ground (with concrete). Question I have will 4x4 square pole be good for this application, and would 1/4" thickness...
  33. R

    Simple beam deflection and center load

    Homework Statement http://www.upload.ee/image/4762203/DSC_0009_1_.JPG I need to find the formula which is in the red circle. Beam is simply supported at both ends and there is center load. Do you think that this is correct? Homework EquationsThe Attempt at a Solution
  34. H

    Load moving horizontally across bridge, speed affect loading

    a load moves horizontally across a flat bridge, eg a train, does the time the load is on the bridge affect the vertical force on the bridge. put another way; can a bridge support a load greater than it's maximum load it can support for a stationary object if the load is only on the bridge for a...
  35. R

    Torsion, angle of twist, diameter, load, momentum and find G

    http://www.upload.ee/image/4760492/DSC_0002.JPG Homework Statement I have given angle of twist, diameter, uniform load, and length of the beam. I need to find the G.The load gives me some trouble and i don't know if i should solve it by using integration or? :) Homework EquationsThe Attempt...
  36. R

    Clip that will auto release under load?

    First time poster. Looking for a clip that will release under a load of ~250lbs. Been looking at shear pins and torsion springs but wondering if something already exists. It will be used between two ropes and will release automatically once load is hit. Something adjustable from 200lbs. to...
  37. B

    Abaqus 6.14 CAE - Imperfection Study

    The title of the project is as follows: A study of the effect of imperfections on the buckling capability of a soda can under axial loading. My group and I are aiming to carry out the following: Linear buckling analysis of soda can to gain first 5 eigenvalues Riks buckling analysis with...
  38. mehgon

    Does a truck's load affect its braking distance?

    Two trucks with the same futures,one loaded and one empty. They are traveling on same speed and when they brake on the same spot;which one stops earlier? Does a truck's load affect it's braking distance? Thanks..
  39. ErnieChicken

    Transformers Under Load and No Load

    Homework Statement I have a step down transformer (6 : 1) Copper Loss of 110W at full Load Primary Coil: I = 3.33A R = 0.35 Ohms Power Loss = 4W Secondary Coil: I = 20A R = 0.265 Power Loss = 106W Power Drawn Over the Primary = 75W 9kVA Transformer Homework Equations The Equations i have...
  40. B

    Find force to raise load using friction and two bars

    Homework Statement Calculate the horizontal force P required to raise the 100-kg load. The coefficient of friction between the rope and fixed bars is 0.40. Homework Equations T1/T2 = e^(βμ) Where β = the angle of the rope on the log, μ = 0.40, T1 = the bigger tension (P), and T2 = the...
  41. B

    Course load would be too much?

    Hello all, I am currently in undergrad and am planning on taking 18 hours next semester (4 maths and 2 physics courses). I was just wondering if anyone who has taken these courses could tell me if the course load would be too much. The courses are: Linear Algebra, Differential Equations...
  42. P

    Engineering Course Load: 15 vs 12 Credits - UT Arlington Transfer

    Hi there, I would like to hear your opinion on taking 15 credits vs 12 credits. All the classes are engineering classes worth 3 credits hours. The list goes as follow: INTRO TO ENGINEERING DESIGN (Lecture) INTRO TO ENGINEERING DESIGN (Laboratory) SOLID MECHANICS (Lecture) NUMERICAL...
  43. brainbaby

    Effect of load voltage variation in this circuit

    If load voltage vary..will Vce_Q1 changes in opposite direction in order to compensate change in Vce_Q2 in order to eliminate early effect in Q2...??
  44. I

    What are the Internal Forces at Point C in a Distributed Load System?

    Homework Statement find internal normal, shear, and moment forces at point C, P=8kn The Attempt at a Solution for the most part I can solve this entire question but looking at the solution for it one of my equations is different and I cannot figure out why. my equation for finding T(tension...
  45. D

    How do I plot the load line for a nonlinear network with an ideal diode?

    Homework Statement Plot the iA vs. vA characteristics for the nonlinear network shown in Figure 4.49. Assume the diode is ideal. The nonlinear network from part (a) is connected as shown in Figure 4.50. Draw the load line on your v i characteristics from part (a), and find iT Homework...
  46. R

    Confirm Formula Please (total load on load cell)

    I am using the following formula to determine the lb load against the bottom of a load cell from tightening the bottom anchor bolt nut (which anchor bolt goes through the center of the load cell structure and anchors to a bottom base plate) to a certain torque force, plus adding a live static...
  47. M

    Parachute Problem, Figuring out largest load it can hold

    Homework Statement A cargo packed for aerial dropping can withstand an impact speed of 20 mph. A 100 foot diameter circular parachute is used for a particular load. What is the largest load (including the chute itself) that can be accommodated by this chute. [/B] Homework Equations Vt =...
  48. ranju

    Finding Full Load Current & Torque in Induction Motors

    In an induction motor problem , I need to find the full load current & torque..for that I calculated the impedance with given data..& I got the impedance in polar form..But in the solution for finding the full load current they put only the magnitude of the impedance & not the phase..! I didn't...
  49. S

    Solving Question 3: Is the Fulcrum Lifting the Load?

    Homework Statement http://tinypic.com/r/24mua0h/8 Homework Equations I've done all parts except question 3, which I'm not sure. is it because the fulcrum is providing an upward force to keep the load in the air? The Attempt at a Solution
  50. P

    Testing voltage regulation of MC7805 using active load

    Homework Statement The attachment depicts an active load (to the right is the equivalent circuit). It is called thus because this load (measured from TP27) changes its resistance according to the controlling signal connected to TP25. The load is switched “on” (minimum resistance) and “off”...
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