Questions tagged [statics]
Statics is branch of engineering concerned with the analysis of forces and moments on physical systems in static equilibrium.
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questions with no upvoted or accepted answers
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Incompressible 2D pressure-driven flow: for Navier-Stokes equations in nondimensional form, how should I express pressure boundary conditions?
*I have updated this question.
I'm using two codes for modeling incompressible, two-dimensional flow out of a tank. My fluid dynamics experience is pretty basic; I'm using the codes to understand a ...
4
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0answers
122 views
Calculating a pull force between two pieces of plastic
I have an HDPE pin, 2 mm high, 2 mm diameter, that I impress into a flat plaque of hot HDPE. It is not hot enough to melt the pin, but still hot enough that the material will shrink 4% in 24 hours.
...
2
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0answers
47 views
Moment of a force in 3D
The question is not to help me get my task completed. There is the 3D statics problem that I have been attempting to solve for a long time. I have no help, hence I would like to pose you a few ...
2
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0answers
73 views
Analysis Of Planar Frame Using Hardy Cross Method (Moment Distribution) With Sway
The image shown below is a sketch of the structure/frame that I am attempting to analyse using the Hardy Cross (Moment Distribution) Method. I need to find the bending moments, axial forces and shear ...
2
votes
3answers
65 views
Extendable apparatus
Is there a kind of "handbook" for general engineering ideas and possible applications? I vaguely remember a machinist friend mentioning some standard book to glean ideas from...
I'm in need of an ...
2
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0answers
81 views
Determining the load on a pump vibration isolator
It seems to me that pump vibration isolators need to support:
The weight of the pump
The weight of the water in the pump
The weight of the water (only) in the drop to the pump
The supplier of ...
2
votes
0answers
19 views
Shift of joint in kinematically indeterminate system
Given ist the following system:
$$EI=100000\frac{\text{kN}}{\text{m}^2}$$
$$EA\to \infty$$
I'm suppossed to find the horizontal and vertical shift of joint g. My first approach was to use the ...
2
votes
1answer
129 views
Equivalent Force: Hydraulic rams in H frame machine press
A 100ton H frame machine press can use 1x100 ton ram to exert this amount of force.
Can 3x33 ton rams do the same job if they are applied to same area as the 100ton ram?
Also in relation to a H ...
2
votes
0answers
187 views
Fluid Statics Problem
I have been attempting this question for a while now. Could anyone give me a hand?
The question and the work I have done so far is below. My final "answer" is
P (force required to keep the gate ...
1
vote
2answers
43 views
Forces acting on a weightless member
A weightless bar is pinned at the top of a triangle with N weight. Both rests at the horizontal plane.
There is a horizontal force F acting on the weightless bar, and a given coefficient of friction Ī¼ ...
1
vote
0answers
34 views
Statics - other methods for determining reactions of supported beam
Question: Because the question regards the statics, I am going to pose it as well.
Are there other methods to solve equilibrium problems other than the method of sections, when dealing with pivots. ...
1
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0answers
30 views
Determinating Reactions for the following frame
According to the frame below, the goal is to determine the reactions of this frame in order to draw after the diagrams N, T and M.
The frame is asymmetric by reference at point C.
All reactions ...
1
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0answers
33 views
Solidworks static simulation having issues
I've got everything set. Material is aluminum alloy 6061. I've set the component contacts to no penetration. I have a contact set where both blocks meet and keep getting the same error. The bottom ...
1
vote
0answers
97 views
Derive a Transfer Function from first principles (PID, system identification, statics)
I want to derive a transfer function of my system so I can plug it into MATLAB and use the PID tuner tool.
My system is a balancing beam with a motor on each end of the beam.
My first principles ...
1
vote
0answers
211 views
Simple beam deflection of cantilever beam
Recently I had need to prove the beam deflection equation for a simple cantilever beam with a point load at the end. The equation would be in reference to the Euler-Bernoulli theory taught in most ...
1
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0answers
50 views
HELP WITH ASSIGNMENT. CENTER OF GRAVITY
I have a Statics assignment which I don't seem to fully understand.
Here is the full assignment:
For the first question I have tried making several tables with Areas of each parts and the centre of ...
1
vote
0answers
172 views
statics exam question about friction
In a statics exam I had the question in the picture attacehd and I had some trouble understanding it. The question is so
Under the effect of torque Mo rotates a wheel (radius r) with constant ...
1
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0answers
167 views
Can a propeller be used as a balancer by spinning it perpendicular to ground?
This is a unique idea of mine. In the above image, the torque reaction propeller is rotating clockwise producing a side-thrust of 40N. With its reaction torque alone, it has to balance the moment ...
1
vote
0answers
236 views
Maximum slope of the road for a car pulling a trailer
I have a five meter long, 2.40 meter wide, 200 kg portable catamaran I've built at home. To transport, I bought a semi-finished trailer, just the running chassis; and built the upper structure, namely ...
0
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0answers
31 views
Program name of this buckling modeling
My instructor sent this solving with program that I donāt know the name , does anyone know the name of the program ?
0
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1answer
38 views
Sign of the sum of Virtual work (Direction)
I have trouble understanding Virtual Work (in statics) as I understand what's happening but I do not understand the signs or directions.
This is what I know. If the force acts in the opposite ...
0
votes
0answers
44 views
External moment over an hinge
I want to find the moments around points A and B in the following figure.
Suppose the structure is fixed at the point where $F_{ax}$ and $F_{ay}$ are located.
I consider A and B to be hinges so that ...
0
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1answer
69 views
Bending of an L-shaped beam
First post so bear with me:
I am designing a frame for a press, which needs to be able to withstand 250 N. I am planning to make the frame an L-shaped beam, turned around. With a side view, it will ...
0
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2answers
68 views
Beam/column sizing
If a load P is applied as shown to a fixed column-beam, pinned at the bottom, should the beam or column (or both) sizes be increased to resist the load?
0
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1answer
62 views
Question on the determinacy of frame structures
I have been working on a program to solve frame problems, and I have used the following formula for determining whether a frame is statically determinate:
$$RD=3m + r-3j-s,$$
where:
$m$ is the number ...
0
votes
1answer
41 views
How do you replace forces and place them in another location?
Everything i've tried so far is probably wrong. I tried using 40 as the traverse angle and 30 as the azmuth angle to find the cosine of the euler angles, and then multiplied all three by the force's ...
0
votes
4answers
101 views
Why are parts of a cylinder closer to centre elongated less during torsion?
Say we have a fixed cylinder with a radius of $R$. Looking at any cross-section, the shear stress at a radius ($r$) is given by $\tau = G \gamma $.
I understand that the particles at the outer radius ...
0
votes
0answers
247 views
Deflection Of Beam In Structural Rigid Jointed Frame
This is a recommended follow on to one of my previous questions. It was stated that I could find the deflections of a beam by idealising it as a simply supported beam and then calculating accordingly. ...
0
votes
0answers
104 views
Finding Tension in cable in 3D Equilibrium
In a typical 3D Equilibrium problem.
Assume you have two cables points supporting a mass. The two cables are K distance above origin and form a quadratic triangle with the mass which is a the same ...
0
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0answers
57 views
Statics poblem with a pre-stretched spring
I am dealing with a statics problem in the following link. This question is from the courtesy of Engineering mechanics, Statics by R.C. Hibbeler, 13th edition.
Before applying vertical forces F and -...
0
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1answer
97 views
Analysis of Machine Frames With Cut Outs
I have a structure that is used to support two shafts which are carrying relatively high loads. It is composed of two columns and a "shaft supporting block" in the centre (almost acting as a beam). ...
0
votes
1answer
124 views
Calculate bearing forces
can someone tell me how to calculate the bearing forces of the two bearings?
I can't get any further because I don't have the angle for the second bearing.
I don't have an idea anymore.
F = 20KN
q0=...
-1
votes
1answer
32 views
Stewart platform 6DOF parrallel manipulator static force diagram
I am trying to develop a statics free body diagram of a stewart platform 6dof parallel manipulator motion table. I have the base points (B1,B2,B3,B4,B5,B6) and the top platform points (P1,P2,P3,P4,P5,...
-1
votes
1answer
60 views
How would you go about calculating the force required for an actuator to lift a bridge?
I have been trying to come up with the optimal way to calculate the force required for an actuator to be able to lift a bridge 90 degrees. (A drawbridge) The actuator is placed as follows: (The bridge ...
-1
votes
1answer
34 views
Method of joints not working on simple truss, supposed to be stable and determinant
In the process of editing the question to put better pictures of my dimensions in, I realized that how I calculated my angles was incorrect, and that is why my answers were yielding inconsistent ...
-1
votes
1answer
244 views
Inertia relief in ANSYS - rotating model
I'm trying to use ANSYS to solve statically a dynamic problem.
As shown in the image below, there is an orange bar that is constraint to slide horizontally only and attached to another bar (pink) ...
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1answer
142 views
Analysis Of Braced Frame By Hand Calculation
Suppose we have a rigid jointed, statically indeterminate frame with bracing as shown below:
Note: there would also be a distributed lateral load along at least one side of the structure and all ...
