Hi, I have been given this pin-jointed frame analysis to solve (see pictures of the structure attached). Can you help me? The Figure 2 attached is a simplified structure to undertake a structural analysis on a concept design for a low cost stroller/buggy for children. The buggy consists of a number of metal sections that are pin-jointed together. The buggy is designed to accommodate a child of mass no more than 20 kg, sat on the seat which is supported at four points (Fc) on the frame of the buggy. Assume that the weight of the child is equally distributed across all of the points indicated on Figure 2 as Fc. Assume that there are no additional forces applied to the handle of the buggy, that the buggy is static (stationary) and that the buggy, and the elements of the frame have no mass. At points A and G, there are roll supports. At Points B, F and D there are the pin supports. I am required to determine the following: 1) Draw a free-body diagram of the structure 2) Simplify the Free Body Diagram to allow the reaction force at A and G to be calculated 3) Calculate the Moment around A 4) Calculate the Moment around B 5) Determination of point of concurrency using graphic illustration 6) Use of force triangle to calculate the value of force at D, F and G. 7) Illustration of forces acting on ABCDE and use force polygon illustration 8) Calculations of perpendicular components of forces at A, B, C, D and E. 9) Calculate Bending Moments at A, B, C, D and E and draw a bending graph. 10) Illustration of shear force diagram at ABCDE.
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
Hi, I have been given this pin-jointed frame analysis to solve (see pictures of the structure attached). Can you help me?
The Figure 2 attached is a simplified structure to undertake a structural analysis on a concept design for a low cost stroller/buggy for children. The buggy consists of a number of metal sections that are pin-jointed together. The buggy is designed to accommodate a child of mass no more than 20 kg, sat on the seat which is supported at four points (Fc) on the frame of the buggy.
Assume that the weight of the child is equally distributed across all of the points indicated on Figure 2 as Fc. Assume that there are no additional forces applied to the handle of the buggy, that the buggy is static (stationary) and that the buggy, and the elements of the frame have no mass.
At points A and G, there are roll supports. At Points B, F and D there are the pin supports.
I am required to determine the following:
1) Draw a free-body diagram of the structure
2) Simplify the Free Body Diagram to allow the reaction force at A and G to be calculated
3) Calculate the Moment around A
4) Calculate the Moment around B
5) Determination of point of concurrency using graphic illustration
6) Use of force triangle to calculate the value of force at D, F and G.
7) Illustration of forces acting on ABCDE and use force polygon illustration
8) Calculations of perpendicular components of forces at A, B, C, D and E.
9) Calculate Bending Moments at A, B, C, D and E and draw a bending graph.
10) Illustration of shear force diagram at ABCDE.
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