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1500 questions
6
votes
2 answers
How can I determine a function equation from a graph image?
How can I find out the function equations in a diagram with 5 curves? Measuring by hand is very inaccurate and takes a lot of time. Any other possibilities?
André Rodriguez
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What do you call a mechanism where rotation is transfered in one direction only?
I have the following to wheels that rotate on the same axis:
Assuming that they are stuck together, if I rotate the green one the red one rotates at the same speed and when I stop the green one the red one stops.
I'm looking for the name of the…
Julian
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6
votes
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I-beam annotation for tube on drawing
I have been sent a clip of a drawing with the following annotations on it, but I've never seen them before and can't figure out what they mean. Is there a standard interpretation of these callouts?
Initially I thought that they might be some…
Ethan48
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votes
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Thin film sheet-resistance (van der Pauw method)
A well-known method to measure sheet resistance is the van der Pauw method. Looking at Wikipedia they state that the cloverleaf configuration is the most advised. Two questions naturally arise:
Why is this the best configuration?
Why is it a…
Worldsheep
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6
votes
1 answer
How to derive Equivalent Static Load for irregular structure modeled with FEM?
Building codes such as the Uniform Building Code (UBC) or International Building Code (IBC) require the determination of Equivalent Static Lateral Forces in order to compute $P-\Delta$ effect and to perform checks on the structural design.
However,…
Graviton
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6
votes
1 answer
RC car steering mechanism type
I need to figure out what type of steering does this 1:10 Himoto Buggy Zmoto Z-3 RC car have in order to be able to calculate the steering angle from servo position for a robotics project. Is it the same mechanism as Rack-And-Pinion steering?
I…
Kozuch
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votes
1 answer
Programmable parameter change of Pro/E simulation by using Excel VBA , Matlab, Labview or Pro/E own function
Now, I've been conducting beam simulation by using Pro/E.
I would like to change payload(force) of beam step by step, and then plot the relation between deflection and payload(load range : 50kg to 500kg, step size : 25kg).
But, this task is too much…
KKS
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6
votes
2 answers
What is the down-stand beam called at an edge of a surface bed or raft foundation?
What is the down-stand beam called at an edge of a surface bed or raft foundation? It is not exactly a grade beam or stem wall. It is more like a toe.
SlydeRule
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6
votes
1 answer
How would you mechanically model an Earth-Moon like orbit?
I'm hoping to make a small mechanical demo (~10cm tall) that models an orbit that is similar to the Earth-Moon orbit - that is, only one side of the Moon faces Earth. I'm trying to keep it simple, so here's my idea so far:
where the blue and yellow…
John M.
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6
votes
2 answers
Should P-Δ effect be considered for struts of a braced excavation?
Building codes such as BS5950 provide clear guidelines on how to consider P-Δ effect due to sway of a vertically loaded portal frame or single storey building, causing additional moment in the columns.
Should this sway frame effect be extended to…
Question Overflow
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How does the location of a mass affect its dampening performance?
I'm looking at something called at a Steadicam that stabilizes cameras. It looks like this
Clearly, the weights at the bottom are used for dampening/stabilizing. If the arm holding the weights were shorter/longer, would the stabilizing effect be…
John M.
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6
votes
3 answers
Why use a 'dogbone' shape for tensile testing specimens?
Why is that the shape of the tension test specimen a dogbone-like shape?
I know that it is so that the deformation is confined to the narrow center region and to reduce the likelihood of fracture to occur at the ends of the specimen. But why is this…
strateeg32
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0 answers
What is the theory behind Eurocode 1 - Part 2: Traffic loads on bridges?
I'm interested in some theory Eurocode 1: Actions on structures - Part 2: Traffic loads on bridges. How were the limits chosen (e.g. maximum deck acceleration = 3.50 m/s2)? Why is the lower limit of $n_0$ governed by dynamic impact criteria and…
megamicke
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6
votes
1 answer
What is Byte Alignment Time in radio communication?
According to this paper, which deals with time synchronization in wireless networks, this kind of delay occurs, however I do not understand its explanation. The paper says the reciever (radio) has to determine the bit offset of the message from a…
sifear
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6
votes
3 answers
Electromechanically open and close a small, hinged door?
I have a chicken coop I plan on modifying to automatically open and close the door at dawn and dusk.
What sort of actuator or mechanism would be appropriate for operating the small, side-hinged door?
Constant power is not available (solar) plus it…
bufferout
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