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Questions tagged [mechanical-engineering]

Questions within the problem domain of mechanical engineering. Mechanical Engineering can be a broad field; consider choosing more specific tags if they apply.

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explain the inlet valve mach index and the mean piston ratio

this is the attire i wear during practical day in the university. The white shirt is an overcoat which I wear and the goggle is worn to protect my eyes from any particles from entering my eyes during ...
0
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1answer
15 views

Contradictory result for mass balance

I solved this problem by doing a mass balance for the mixing chamber and an energy balance for the water heater and the mixing chamber as follows: $\dot{m}_{\text{mix}}=\dot{m}_{\text{Tank}}+\dot{m}_{...
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1answer
18 views

Are there any science fair ideas that concern designing or creating something that had a benefit? [on hold]

I am looking for science fair project ideas and am interested in any branch engineering. Would you have any ideas for a science fair project? I am in grade 10.
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0answers
21 views

What is an engineering term for this type of arm

I'm trying to describe a part - it's an arm that holds an axle sleeve (which ultimately holds a wheel). I'm stuck right now describing it simply as a "wheel arm", but was wondering if there was some ...
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0answers
18 views

Polyurethane with microbial resistance properties

I'm looking for a polyurethane with microbial resistance. Doing some research I found two commercial types: DESMOPAN 9392A and DESMOPAN 2792A. Both are manufactured under GMP conditions and limited ...
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1answer
46 views

stress strain curve properties analyse

There are two components given with each stress-strain curve. Determine the component that maximise the load carrying capacity and that maximise the elastic deformation per unit applied load. Is it ...
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1answer
24 views

Curve-linear vs. Cartesian coordinate systems: linear-elastic & isotropic elasticity tensor

For shell elements, is the elasticity tensor for linear-elastic & isotropic materials the same in a local curve-linear (convected) system vs. a local Cartesian system? I wonder because ...
2
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0answers
27 views

hot wire anemometry

Hot wire anemometry can be used to measure the temperature of a wire in fluid flow. The voltage fluctuation across the wire is used in conjunction with an energy balance on the wire to obtain the ...
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1answer
29 views

In equilibrium is engine torque zero? Vehicle dynamics

Consider following equations for a driving wheel in a car. $$ J\dot{\omega} = T - F_x R - F_r R \\ m\dot{v} = F_x + F_r $$ where $J$, $\omega$, $T$, $F_x$, $R$, $F_r$, $m$, and $v$ are wheel inertia, ...
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0answers
30 views

what is the most efiicient way to mill/ machine a spherical and pancake ish structure as seen in the figure?

The overall dimensions for rectangular block: 8” x 3” x 2”. Ball should stay the longitudinal center line of rectangular block Bottom pancake feature should stay lateral center line of rectangular ...
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4answers
565 views

Dimensions for CNC machining

Creating a drawing for a part that will be CNC milled. Should all of my dimensions come from a baseline on the part, like an edge or is it ok to use Centerlines? See yellow highlighted dimensions ...
2
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1answer
36 views

What thread to use in tapping a hole for a 2-56 Helicoil insert?

Helicoil from McMaster-Carr 18-8 Stainless Steel Helical Inserts 91732A201 calls out a specific tap to use, but I cannot find out what thread this tap is putting into the hole for the insert. I want ...
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1answer
39 views

90 degree pivot steering system to allow vehicles to move sideways

Are there any restrictions that would not allow a steering system to cause a vehicle to be able to move sideways - at 90 degrees from the convention direction of travel?
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0answers
16 views

Two wire tandem gas metal arc welidng (GMAW-TW)

Please explain how two wire tandem gas metal arc welding (GMAW-TW) process requires less heat input. Appreciated if reference is given.
0
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0answers
18 views

Gears, transmission

Good day, I hope I can express this question of mine properly as a non-native speaker and without the proper knowledge of the terminology in English. I've got a small Stepper motor on which I will ...
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0answers
31 views

load in a stepper motor

I want to move a 7 kg object linearly, using a stepper motor. How can I determine the torque required by a stepper motor depending on the load?
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1answer
33 views

Can you make a decision on where is defect if you have the frequency spatially?

Let's say for a steel bar, you have the frequency information on each spatial location along the steel bar, could you make a decision that a defect/crack is exist on the specific location without ...
2
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0answers
28 views

Water wheel Calculations required

Problem: I have been asked to help determine whether a waterwheel is able to generate enough power to run 5 x 15kW pumps in a remote location in Zambia where there is no constant power supply. I work ...
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2answers
38 views

Why do we use simple bending equation when bending moment is caused due to shear force?

Simple bending equation is derived assuming pure bending(when a couple is applied onto a beam with no shear stress).We tend to use the above derived equation when moment is caused due to shear stress?...
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2answers
39 views

Rotating Control Panel for Arcade Cabinet

I am building an Arcade cabinet with a 3-sided rotating control panel. I want the rotation of the control panel will be automated. Here's a render: However, I have a problem: locking the control ...
0
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1answer
36 views

Bending moments and stress in beams

A uniform square beam of sides 200mm is to be used as one side of a ladder chassis of a commercial truck. The beam is to be constructed of steel, E=205Gpa and yield stress,320Mpa. A load analysis of ...
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1answer
33 views

Understanding Motor Torque calculations

I have an Aluminium square cross sectional rod of $20mm$ X $20mm$. Length 700mm. At the end of this rod there is a mass of $660$ $g$ attached. My question is what torque do i need to lift this mass up ...
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1answer
37 views

Two Dimensional Kinematics

Attempting this kinematics question but not really understanding if what I'm doing is right or completely wrong. Should I be starting by finding Vp? Any help appreciated. Not an assignment, just ...
2
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1answer
27 views

Speed and Feed values for log slitting of paper

Context: I have a paper roll of about 8 in (20 cm) diameter mounted in a 3 inches core (7.62cm). Its length is about 1.2 m. The paper is bond of 95 g/m2. I have to cut slices of it of about 10-18 cm ...
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1answer
65 views

How to convert Joules(kinetic energy) plot chart into watts?

How to convert Joules(kinetic energy) plot chart into watts? Anyone know how?
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1answer
24 views

How can I measure the coefficients of friction of pulleys?

I have to study several industrial pulleys made for lifting heavy weights. It is important to select one which has a low coefficient of friction because the system is based in a hoist and several ...
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1answer
25 views

How to get the surface area of trajectory [MSC Adams]?

I'm not sure if the upper question is clear enough to understand but here's what I've got: I've made a model of excavator in Adams View and got trajectory of it's motion (boom, stick, bucket) using ...
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0answers
46 views

What is this pan-tilt system called?

Based on the description of friend I drew this small example of a specific pan-tilt mechanism I'd like more information on, but as I'm not an engineer I don't really know what terms to use and can't ...
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2answers
28 views

Why is the Current to Motor less than Motor Rated Current?

I have a motor for a submersible pump with a Rated Current of 8.4A as given in the motor's electrical data. However, when it is running, I record a current of 3.4-3.9A. Is there a fault I am supposed ...
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0answers
18 views

How to define a function as a magnitude in joint load

I am beginner to ansys. I have equation of angular velocity like this: q(t)=12.7+8383.4t^3-41147t^4+88190t^6-98866t^7+56593t^8-13058t^9 where t is time in seconds and would like to use it as the ...
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3answers
48 views

air-dropping actuator for a small drone

I'm planning to build an air-dropper for a small drone - a device to release small payloads hanging under the drone. This is a commercial example of such a system, used with a much bigger drone - for ...
0
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2answers
45 views

How to determine optimum chilled water outlet temperature?

We have water cooling chillers and crahs in our data center. What I want to learn is what will happen if I increase the chilled water temperature. For example, the indoor units (CRAH) set temperature ...
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1answer
62 views

Should one use multiple elements through the thickness with multiple materials?

To get realistic results from a FEM calculation, it is common (or so I've been taught by someone who may not be up to date) to use at least four or five elements through the thickness of a beam or ...
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1answer
75 views

Strain gauge - analysis in ANSYS

I am a complete beginner in Mechanical Engineering, FEM and ANSYS so any help would be greatly appreciated. I want to simulate the behaviour of the strain gauges on an object. Strain gauges are ...
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0answers
33 views

Finding the Work done by Nitrogen

I have assumed Nitrogen gas as an ideal gas for solving the problem. But our professor says that don't assume it as ideal gas and calculate the work done by only using thermodynamic tables. But I don'...
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1answer
44 views
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1answer
32 views

Pressure rise in horizontal pipe

What causes the pressure change in a horizontal pipe with no energy input. Is it the head loss? If so, how?
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1answer
41 views

Quick return mechanism for spring-loaded screw

Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a screw ...
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0answers
16 views

Books and resources for an entrepreneur inventor? [closed]

What books would you recommend for an inventor entrepreneur?
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1answer
29 views

Limiting rotation to +20 to -20 degree

Stepper motor should drive a frame to tilt, but not 360 degrees, but only within 20 to - 20 degree. What simple machine elements do you use to restrict the freedom of movement? It must be a mechanical ...
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0answers
50 views

Definition of $$ in formulas

I'm trying to work out stresses in a beam. What do $$ and sigma represent in engineering formulas? I can't find explanation in the site I'm looking at and Google isn't coming up with anything (...
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0answers
12 views

Visibility/Height Requirements for Plumbing Air-Gaps (Commercial Building)

Are there any visibility/height requirements with regards to plumbing air-gap design/installation? We're looking at using an air gap device to allow HVAC condensate drip to enter a buildings ...
0
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1answer
34 views

Reynolds transport theorem and eulerian material derivative

The problem as well as my work so far are in the image. I begin with equation (2.23) and use the divergence theorem to express the second term as the surface integral part of the problem equation. ...
0
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1answer
38 views

What joint does elevator DOOR use?

Does elevator door use prismatic or revolute joints to open and close its door?
4
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2answers
97 views

Deflection of L shaped plate

I would like to calculate the deflection of the following geometry with a 3D load in Y direction: Do you know of any textbook, website etc. which discusses how to do that analytically ? I cannot find ...
2
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1answer
40 views

Robot velocities based on IMU data

I'm currently stuck on obtaining a description of the robot base velocities (xdot, ydot, thetadot) based on data obtained from 4 IMU sensors located, with an offset, on 4 pivot points. See picture ...
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1answer
53 views

Eulerian and Lagrangian descriptions of velocity

I feel as if I understand the conceptual difference between Lagrangian and Eulerian descriptions. But I can't seem to follow the math. I have one example that I would greatly appreciate an explanation ...
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1answer
23 views

What is the type of bearing used on swivel base chairs?

I'm designing a chair from scratch and I'd like it to have a swivel base. For this my initial idea was to press fit a bearing (thrust bearing) in the shaft of the base and connect the seat by press ...
0
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1answer
65 views

Difference in Diameter calculation using Solidworks and manually

When I try to create a flat form of a archimedes screw using Solidworks it gives me a diameter different from what is calculated manually basically using a Pythagoras Theorem. Can anyone explain the ...
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1answer
66 views

What can a licensed Mechanical Engineer do in the civil/structural field?

When I was younger, I had interned in a civil/structural engineering firm specializing in bridges that had many PE civil engineers on staff and a couple licensed mechanical engineers. Now as a soon-...