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. J

    Power Electronics: Choppers RLE Load

    Homework Statement Homework Equations I rms for triangular waveform = I(max)/ (1.732) R = V/I The Attempt at a Solution Since there is RLE load, current waveform is triangular. It is Source current is Average of I source. I used integration. Assumed Time period = 10 seconds. So T on = 5...
  2. J

    Load Flow Order of Jacobian Matrix Power System

    I'm studying Newton Raphson Method in Load Flow Studies. Book has defined Jacobian Matrix and it's order as: N + Np - 1 N = Total Number of Buses Np = Number of P-Q Buses But in solved example they've used some other formula. I'm not sure if it's right. Shouldn't order be: N + Np - 1 N = 40 Np...
  3. M

    Statics of structure, distributed load

    Homework Statement All data are in the image uploaded Homework Equations I don't know how to deal with two confounded loads The Attempt at a Solution I really need fast replies thnak for your attempt
  4. T

    How do I measure the "load" in a schematic?

    Homework Statement Im doing a project on Emf and internal resistance. I'm just trying to understand what the load would be and where I would put the positive and negative pens on the schematic to find the load. Homework Equations Terminal Voltage would be what I have in the image above...
  5. S

    Automotive Effect of machine weight on clutch Power/Energy

    Why does increase in machine weight doesn't have much effect on clutch's power and energy? I do understand weight is basically normal force, and increase in normal force should make it harder for the transmission to push the increased amount of torque? What is the math behind it?
  6. Pushoam

    I Understanding DC Load Line and its Relationship with VCE & IC

    I didn't understand the following: The relationship between ##V_{CE} ## and ##I_C## is linear. In active region, even if the ##V_{CE}## increases, ##I_C## remains almost same for a given ##I_B##. So, how can the relation between the two can be linear? Can anyone tell me the utility of the...
  7. T

    I Vehicle tire load vs stopping distance

    Forgive me if I have not posted this in the right place but I have a quick question. Say if you have a trailer on a truck, let's say a semi trailer, that has 2 axles on it. You measure the stopping distance from a certain speed. You then add another axle to the trailer that has brakes on it with...
  8. T

    Calculating Beam Load for One Way Slab: Analysis and Solutions

    Homework Statement In this question , i think the author is wrong . In the question , the author use 0.5nIx , i know it's for one way slab . P/ s : Photo 701-703 is for first case . Photo 704 to 706 are for 2nd case . Homework EquationsThe Attempt at a Solution But , i think the load from slab...
  9. S

    B The load of an object on a pivot

    Hi I have a 3.2m platform which weighs 175Kg. One end of the platform is touching the floor but the other end is on a pivoting bolt 2.5m in the air. I need to figure out what the "load" would be on the end which is on the floor when I try to lift that end 4.5m in the air. Basically so I can...
  10. A

    Darryl drives his load of tomatoes.... (Velocity vectors pic)

    Homework Statement Homework Equations a^2+b^2=c^2 c^2=a^2+b^2-2abCos(theta)The Attempt at a Solution I'm having trouble trying to draw out the vectors. This is my attempt. I feel like it is wrong. Can someone help out please? Also, I'm not sure where to go from here... If I used...
  11. J

    Inductance and Capacitance as the Secondary Load

    What are the effects of adding inductance and capacitance as secondary load of transformer? I am using a Ring /Toroid Transformer.
  12. bachir1994

    Emf without load and load voltage of a generator

    HelloLast week I was confronted with a situation where an industrial equipment, with a large equipotential mass (metal casing) that was not grounded, had a ground tension, measured with Fluke, of 382 vac. I put a 220 Vac bulb and nothing happens, the bulb remains off and is not burned out. By...
  13. V

    HX711 query (Amp/ADC for load cells)

    For the HX711 (data sheet here) I am a bit confused by what it expects as the input voltages. I think its this bit that is relevant: "Channel A can be programmed with a gain of 128 or 64, corresponding to a full-scale differential input voltage of ±20mV or ±40mV respectively, when a 5V supply...
  14. R

    Determine the load voltage levels in feeder systems

    Homework Statement Hi guys, I was just wondering if anybody could help me with the below question Homework EquationsThe Attempt at a Solution Radial Total load = 3.2 /_-36.87deg + 2.3 /_ 53.13deg =(2.56 - j1.92) +(1.38 +j1.84) = (3.94 -j0.08)...
  15. J

    Assessing Power Rack Max Load: A Scientific Inquiry

    I'm a petroleum engineer, so this is outside of my wheelhouse... I'm also a fairly avid metal worker and fabricator. Also I ask this question out of a curiosity, not because I'm building a rack or basing a financial decision off of the verdict of any resulting calculations. I feel like the "max...
  16. Mr Davis 97

    Work problem -- raising a chain and load

    Homework Statement Consider a 40-foot chain that weighs 4 pounds per foot hanging from a winch 40 feet above ground level. Find the work done by the winch in winding up the entire chain with a 600-pound load attached to it. Homework EquationsThe Attempt at a Solution ##\displaystyle...
  17. I

    Calculating the load on planetary gear from driving torque

    Hello, I am very new to gears I am fairly confused about planetary gears. I want to know the load on the gears contact point between the sun and the planets and the planets and the ring, assuming the ring not moving. Given I have the solid works file ,the pressure angle, and the gear ratios, I...
  18. R

    Load Angle of Synchronous Motor at No Load

    hi all, Just a quick question, what would the load angle be of a synchronous motor when running at no load. would it be 0 degrees or 45 degrees
  19. D

    Radial bearings to take load off a movable pulley/sproket

    I have an arrangement where a movable pulley has a hook attached. This pulley has to take a load of 5 tonnes and yet move along the horizontal direction. Is it possible to achieve this by using a radial bearing?
  20. Ridzuan

    JIS-B8830: Wind Load Assessment book

    Hi guys Does anyone here got the JIS-B8830: Wind Load Assessment book in English version? I've tried to get it from online and from bookstore but only Japanese version is available. thanks guys
  21. R

    Spring deflection load calculation for excavator

    1. A hydraulic cylinder equipped with a helical coil compression spring(figure is attached). The oil pressure acts the spring and moves the boom from position 1 to position 2. Maximum boom load in position 1 F1max= 16550N Minimum boom load in position 2 F2min = 18550N cylinder load...
  22. Nick Goodson

    DC Motor Speed Increases Under Load - Modeling w/ Simulink

    Hi, I am modelling a DC motor using Simulink. Under no-load conditions, I get a max speed of 180 rads/s, but under load, the speed goes up to 290 rad/s, although takes longer to reach max speed, acceleration decreases. I have a mechanical background so don't know much about motors, but would...
  23. S

    How can a static shock load requirement be defined?

    A customer of my employer emailed me with some requirements for a new machine that they plan to build. Everything was fine until I got to the part of the static shock load requirement of 2700in-lbs. A static load is a force/load put on for a long period of time, but shock load is a sudden or...
  24. P

    Calculating Heat Load: Understanding Formulas and Physical Properties

    Hello everyone, I'm having problems understanding how to calculate heat load. Does anyone know what formula should i use? I tried to calculate energy needed to cool the gases to 20 F but i need specific heat witch i don't know how to calculate. Info in the picture. Thank you for your time :)
  25. T

    How to determine a load for belt tensioner

    Hello all. I am trying to understand how to calculate the load in a certain arrangement. More specifically, when there is no work being done on the belt, a set of idlers are under equal load. When the main drive pulley at the top is rotating counter clockwise, the belt on the right in the...
  26. K

    What is the best way to determine the distributed load for a cargo shelf?

    Hello forum, I'm hoping i can get some help figuring something out. I'm working on a project which requires a 4 wheel trolley frame to be designed to transport cargo. The basic dimensions of the trolley I've already determined based on the required need and ergonomic guidelines etc. Now i need...
  27. lawa44

    Direct Stiffness Method for a distributed load

    I'm working on a question which asks to determine the deflection, curvature, forces and moments of a simply supported beam with a distributed load. diagram shown in here http://imgur.com/a/wpI4kInitially, I've done the calculation with 1 plane beam element with 2 nodes. At L = 0 and L = 3. But...
  28. B

    Are load cell signal conditioners limited to sample speeds?

    Hi, I need to buy a bridge amplifier for my load cell. I need to be able to take at least 350SPS (samples per second). The only load cell amplifier I can find within my budget states that it has a selectable 10 SPS and 80 SPS output data rate. Heres the link to the amplifier...
  29. M

    Does the load matter to a clutch?

    Does the weight of a car or length of gears it has change the requirements for clutch strength or is the requirement solely dependent on the torque the engine applies to it? I see a lot of consensus that says the former, but I think it is the latter. An engine making 300 lb-ft should need a...
  30. H

    Locking Mechanism reducing load on locking pin

    Hi, I wanted to make a locking mechanism. The problem was the forces on the actuator (solenoid in this case) where getting too high In image 2, the wedge shaped lock plate was exerting too much force on the actuator, which would unlock and could potentially break the actuator. Or I would have...
  31. Manoj Sahu

    Why DC series motor should not be started without load?

    Today a professor of mine who teaches Electrical machines told us that a DC series motor should not be started without load. I wonder why is that so. Please provide a detailed explanation of this PF members. Thank you very much in advance.
  32. L

    How Does Changing Load Capacitance Values Affect Crystal Oscillator Performance?

    How does the load capacitance affect the Crystal. For example, IC manufacturers recommend a Crystal and also load capacitance, like 25MHZ, 16pF. What happens if I choose a xtal with load cap of 10pF 25MHz? I am talking about changing the load caps recommended by IC manufacturer, not the ones in...
  33. P

    Linear elasticity, strutural physics, pressure load

    I have been studying structural physics lately, in particular the linear elastic eqns, governed by the equation of motion. https://en.wikipedia.org/wiki/Linear_elasticity I am trying to solve these equations numerically. I was thinking of a scenario of a rod being compressed on one end by some...
  34. L

    Why reactive power is not tranferred between source and load

    I have read that at a balanced three phase AC system reactive power is not tranferred between source and load but instead it is exchanged between system phases. Is this true? I can't find any book or paper that corroborate this
  35. T

    Load Shoulder Pressure Stress Calculations (Sketch Attached)

    I'm in the process of designing a part which must be submerged down to 2000m (200 bar/20 MPa/ 2900 psi). A sketch of the part has been attached. The outer housing will be titanium and the inner part aluminium. I've carried out the calcs for the outer part to withstand the external pressure, but...
  36. Glenn Borg

    What type of resistor is needed for a dummy load on a 350W PC PSU?

    Hi, I have a 350 w PSU (PC) with 3.3, 5 and 12 v outputs. I want to create a dummy load so that i will remain on and output the correct voltage. However, i found online that a 10 ohm 10w resistor is needed such as this one ...
  37. C

    How much load can 1/8" A36 steel carry?

    Hello, I was hoping anyone with some experience in the area could help me out ...as I know close to nothing at all about the matter. I'm having supports manufactured for a piece of furniture. I expect maximum load to be 300-350lb. This would be distributed among 3 of these supports. Each is...
  38. A

    Find mass of load that falls off truck

    Homework Statement A truck with a heavy load has a total mass of 7500 kg. It is climbing a 15 degree incline at a steady 15 m/s when, unfortunately, the poorly secured load falls off! Immediately after losing the load, the truck begins to accelerate at 1.5 m/s 2 . What was the mass of the load...
  39. Togmeny

    Help with calculating tank weight wooden stand can handle

    Hi everyone, I am new here... please forgive me if my posting is imperfect :p I am planning to purchase a glass aquarium with tank dimensions: 48" (Length) * 24" (Depth) * 22" (Height) I wonder if a wooden stand with only edge support will be able to withstand the weight of the filled...
  40. D

    Calculating load factor for airplane

    Hello! When calculating the load factor in a loop the formula is n=V^2/(g*R)+cos(teta) during pull-up of a loop and another formula is n=1/cos(phi) during a level-flight banked turn. How does one combine these to calculate the load factor during a twisted loop?
  41. Adam Bourque

    What’s the expected heating load as a function of temperature?

    Homework Statement Excel Table gives Temperature of Month & Avg NOAAtemp for bill Homework Equations y = mx + b (Assuming) The Attempt at a Solution 1) if we take temp of month as temp, linear model y=-0.1481*temp+124.8. 2) If we take temp for days of bill as temp, y=-0.1466*temp+124.74
  42. E

    How to Calculate Drag Load of Sticker on Fast Moving Vehicle

    Hi Great Engineers, Need you help. I am required to calculate drag load on sticker to ensure it is not peeling off in operation. The vehicle may moves as fast as 220 km/hr with rectangular sticker size of 30 cm x 40 cm, thickness 0.0635 mm on its body. Wind direction is parallel to 40 cm length...
  43. Eswin Paul T

    MATLAB How to load .mcs files into matlab?

    I am working on Lidar systems and measure the back scattered photons using a Multi Channel Scaler(MCS) The data files are of .mcs format. I need to load these .mcs files into MATLAB. How do I do this in matlab? Is there any function to load these file extensions into matlab? Thanks in advance...
  44. T

    Impedance matching a purely resistive load

    Homework Statement A 25-Ω antenna is connected to a 75-Ω lossless transmission line. Reflections back toward the generator can be eliminated by placing a shunt reactance Z at a distance l from the load (Fig. 1). Determine the values of Z and l. Homework Equations...
  45. N

    Max Load Force on Uniform Pine Beam of 3.6m & 25kg | Safety Factor 5.0

    Homework Statement A uniform pine beam, 3.6 m long and 9.5 cm x 14 cm in cross section, rests on two supports near its ends, as shown. The beam’s mass is 25 kg and two vertical roof supports rest on it, each one-third of the way from the ends. What maximum load force FL can each of the roof...
  46. R

    Keep setting fire to discharge load resistor - Wattage limit

    We kept getting some voltage spikes back into our amplifier. One of the things we put in place is a 10kOhm resistor (discharge load) connected to the output of the amplifier. However, the resistor keeps burning and setting on fire. The amp company offered a way on checking this... I'm really...
  47. F

    Load line analysis in femm4.2

    Dear Forumers, This question is about load-line analysis for loudspeaker driver magnetic circuits in FEMM 4.2 (Finite Element Method for Magnetics), I can't seem to get an answer from the mailing lists. I would like to get the permeance coefficient for random points inside the magnet. I have...
  48. O

    Column under a concentric axial load (Buckling)

    Hi everyone, I have a cylindrical column under a concentric axial load. The load which is applied in the column is less than the critical buckling force (according to Euler´s formula). Due to this load, the column suffers a displacement (buckling effect), and I would like to determine which is...
  49. J000e

    Understanding Maximum Moment for Moving Loads: Strength of Materials Reviewer

    Hey guys, I've been reading my strength of materials textbook and its pretty much like a reviewer that contain several problems and short descriptions of their concepts. There's this formula that computes the maximum moment for two moving loads and its: [PL-(Psmall)(d)]^2/4PL where P= Psmall...
  50. N

    Static Equivalent force for cyclic load (fatigue related)

    Homework Statement I have a suspension mount (square tube with unknown thickness) with a bolt going through it that undergoes an 800 lb load laterally into the bracket in an on/off fashion (NOT fully reversed) at a rate of 50 Hz. Ultimately we are trying to calculate the dimensions of the bolt...
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