# All Questions

11,694 questions
Filter by
Sorted by
Tagged with
5 views

### Is an axial force applied at the centre of a beam considered a compressive force, tensile force, or both?

I was looking through some course notes and realized that I never fully understood this concept. So, looking at the diagram below we can see that there is a 20kN axial force being applied in-between ...
15 views

### What is the difference between a sum of moments about a point versus the moment at a point?

In class we're learning about moments, and I'm not entirely sure what is the difference between using an equation of equilibrium for the moments about a point (in this case C), and the actual moment ...
21 views

### Guidance for a CAD model of a product

Hi Everyone! I am a novice in CAD modeling, and I am familiar with only two CAD tools - Autodesk fusion 360 and Solidworks. I want to make a CAD model of a product with the outer pod or shell as seen ...
17 views

### what is the torque difference in single plate clutch disks and multidisk clutches?

I have a review question that I am not sure about the answer. The question goes like this: "In comparison to single plate clutches, multidisk clutches are associated to which of the below notions?...
32 views

### What is the corresponding transfer function between r and y?

What is the corresponding transfer function between r and y?? I have tried $$\frac{( \frac{k_i}{s}+k_p+k_d\ s )\times P(s)}{1-(-1)(\frac{k_i}{s}+k_p+k_d\ s)\times P(s)}$$
13 views

### How can I join a assortment of points kind of forming an ellipse but not a perfect one

I have already tried spline lines and polyline. I just want to join the points so that they form a curve, its not a perfect ellipse therefore I am not able to get the desired result from the ellipse ...
20 views

### Jacobians and Manipulator Dynamics

This is a Stanford Manipulator I started off working on it by initially setting up the DH table Transformation Matrix and then Homogeneous Transformation Matrix I started finding the linear and ...
36 views

### Can we say that stress strain curve for a tensile test is function of strain rate and temperature?

I am currently studying about tensile test where it is saying that it is conducted at a constant strain rate. Also, it is said that it is conducted at a particular temperature. So can we say that ...
28 views

### How to extract a broken 6.5mm plug from jack?

One of my 6.5mm adapter was broken and the heading pieces was kept in the jack. (picture atatched) What tool should I use to extract the broken part?
48 views

### How can I pull up an NIV (non-invasive ventilation) mask using a motor?

Continuous use of non-invasive ventilation mask causes facial pressure ulcers in some people. I am creating a system of measuring the pressure, temperature of skin under the mask and if the risk of ...
47 views

### Mounting grinding wheels on a threaded rod

I'm trying to mount a set of 6" grinding wheels on an M12 threaded rod. The problem I have is keeping them perpendicular to the rod so that they don't wobble when they turn. The wheels have a 1&...
56 views

### Mathematical derivation for 1st law of thermodynamics

Mathematical derivation for 1st law of thermodynamics : What I know : 1st law of thermodynamics is known as or derived as the conservation of energy . But how are the terms U , q and W derived from ...
22 views

### Would you recommend Delmia works [closed]

I Have a customer that is looking to setup some sort of lean erp system at his business. Has anyone used/setup Delmia Works in their business, would you recommend another product that plays well with ...
20 views

### Durability & air-tightness of PUR tube on barbed air port

I'd like to connect a long tube to a pressure sensor with a barbed port to measure air pressure (ambient air pressure +-10kPa). The sensor's barbed port has outer diameter 3mm. I'm choosing between ...
46 views

### What does “rigid steel” mean in electrical construction plans and specs

Reference to rigid steel is made in specs with reference to metal conduit. A commenter wanted to add 316 stainless steel as the material but this verbiage with regards to "rigid steel" still ...
56 views

### Boundary condition at supported end of a rod

I have one end of a rod held in a hole of a 'rigid' part with no clearance, while the other end is loaded with a force. I have shown 3 simple reaction-force models in the picture. If my intent is to ...
24 views

### Find system equations for the system shown in the figure and F-V analogous circuit

Can't seem to understand how the 2 bodies would interact with each other. For most other problems I use the Nodal method by using the displacements as nodes and then connecting all other elements to ...
102 views

### Can/do Civil Engineers do “hands-on work” such as physically partake in building the infrastructure as well?

Peace and Blessings. While doing research about the Civil Engineering profession, I see that they typically do a lot of computer work, desk work, meetings, and fieldwork in the sense of overseeing ...
45 views

### Filling gaps in heatsink design to improve thermal conductance?

I am currently pondering modifying my laptop's heatsink and am curious whether I stand to gain any benefit at all. The CPU and GPU (similar heatsink design) reach high temperatures (90°C +) under load ...
5k views

### Why exactly does a washer help distribute the stress around a bolt?

Usually the reason for having a washer under a bolt head is stated to be that it helps to evenly distribute the stress to the clamped material surface. But why is this? I would understand if the ...
17 views

### What are the IEC IP standards/code for electric vehicles?

What an end consumer should know about the level of IP protection provided for a vehicle against hazards which include but not limited to environmental factors, thermal runaway in batteries, etc.
23 views

### Effect of area spring at slab on column

Say that a simple building is supported by 4 columns , the column sitting on base slab. I assigned some sort of area spring to the base slab. When the area spring assigned is higher, this cause the ...
15 views

56 views

### How does the stiffness of semicircular beams connected in series increases?

I am working to reduce the deflection in a cantilever/ dive board at work.$300 mm(L) \times 30mm(B) \times 2 mm(H)$, i.e. it's a rectangular cross section currently. I can't change the material, or ...
35 views

### surface temperature due to constant heat flux

Imagine a hollow cylinder with the outside surface exposed to air (convection). If there is a constant heat flux on the inside surface how would I calculate both the inside and outside surface ...
37 views

### Why is the beam bending stiffness taken as $EI/L$?

In moment distribution method, the bending stiffness of a beam is taken as $EI/L$. But in these kinds of stiffness tables, the flexural rigidity is usually divided by some power of $L$: So why is $EI$...
28 views

### Cases in finding the maximum weight of the block

I am dealing with this problem about belt and dry friction. I need to find the maximum allowable weight of block B to maintain static equilibrium. I have given value of weight of the block A. The line ...
19 views

### What is a safe and efficient temperature range for absorption chiller generators?

I've read that the role generators play in the absorption chiller cycle is to concentrate the salt solution so that the evaporator/absorber can maintain a vacuum by constant absorption of vapour ...