Stability triangle

Operators must be taught the principles of the stability triangle. This principle can be compared to a seesaw. If one end of the see-saw has a heavier load than the other, the heavy load will go downward. The determination of whether an object is stable is dependent on the moment of an object at one end of the system being greater than, equal to, or smaller than the moment of the object at the other end of the 

The stability triangle is illustrated by using an invisible dot situated within a triangle under the lift truck. 

There are several additional situations where operators could lose stability. 

The lateral stability of the lift truck is determined by the position of action in relation to the stability triangle. This is represented by a vertical line that passes through the combined center of gravity of the vehicle and the load. When the vehicle is not loaded, the location of the center of gravity of the truck is the only factor to be considered in determining the stability of the truck. 

As long as the line of action of the combined center of gravity of the vehicle and the load falls within the stability triangle, the truck is stable and will not tip over. The truck becomes unstable and may tip over if the line of action falls outside the stability triangle. 

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A-2.2. The stability triangle, used in most stability discussions, demonstrates stability simply. 

A-4.1. Almost all counterbalanced powered industrial trucks have a three-point suspension system, that is, the vehicle is supported at three points. This is true even if the vehicle has four wheels. The truck s steer axle is attached to the truck by a pivot pin in the axle s center. When the points are connected with imaginary lines, this three-point support forms a triangle called the stability triangle. Figure 1 depicts the stability triangle. 

Figure 10-14. Any change to the truck s weight load capacity or certain components, alters the stability triangle. (Courtesy of Clark Material Handling Company)...

Figure 10-15. The invisible dot (center of gravity) will move out of the stability triangle when turning too fast with a load.

The invisible dot will move out of the triangle if an operator overloads the lift truck. Operating with an over-capacity load and coming to a quick stop will violate the stability-triangle principle. 

The training of operators must include classroom interaction and the use of visual aids. Many of the various details of lift truck movement such as tipover, tip forward, counterbalance, stability triangle, lateral and longitudinal stability must be discussed. Trainees must know each model s specific details for operation. Couple this with the different kinds of lift trucks counterbalance, narrow-aisle, walkies, stock-chasers, etc., and it s obvious that there are many details involved in operating a powered industrial truck. 

The attachments may change the center of gravity or the stability triangle of the truck. 

Here, we address the more general question of the relative stability of monomers, dimers and triangular trimers on the (111) surface of FCC transition metals of the same chemical species as a function of the d band filling Nd. All possible atomic configurations of the systems are considered monomers and dimers at sites N and F, triangles with A and B borders at sites N and F (Fig. 4). The d band-filling includes the range of stability of the FCC phase (Nd > 7.5e /atom). The densities of states are obtained from... 

Figure 5. Diagram giving the relative stability of the various atomic configurations shown in Fig. 4 as a function of the d band-filling Nj- From the second to the fifth line relative stability of the F and N sites for the monomer, dimer, A trimer and B trimer. On the sixth and seventh lines relative stability of A and B triangles at N and F sites. The relative stability of HCP and FCC bulk phases is given for comparison in the first line.

It was shown some time ago that one can also use a similar thermodynamic approach to explain and/or predict the composition dependence of the potential of electrodes in ternary systems [22-25], This followed from the development of the analysis methodology for the determination of the stability windows of electrolyte phases in ternary systems [26]. In these cases, one uses isothermal sections of ternary phase diagrams, the so-called Gibbs triangles, upon which to plot compositions. In ternary systems, the Gibbs Phase Rule tells us... 

An additional requirement is that the reactant material must have two phases present in the tie-triangle, but the matrix phase only one. This is another way of saying that the stability window of the matrix phase must span the reaction potential, but that the binary titration curve of the reactant material must have a plateau at the tie-triangle potential. It has been shown that one can evaluate the possibility that these conditions are met from knowledge of the binary titration curves, without having to perform a large number of ternary experiments. 

Figure 3.52 Leading hyperconjugative stabilizations in CFH2CH = CH2, showing the torsional dependence of n-o (solid lines) and a-n interactions (dotted lines) for the C—F (crosses) and two C—FI bonds (triangles, circles) of the—CFF12 group. The sum of all six interactions is shown as the heavy solid line (squares), which may be compared with the total barrier potential in Fig. 3.51.

The intermediate phases formed in the various binary systems have been represented, in a first approximation, as point compounds. The points, which in the different binaries correspond to phases having the same composition and structure, have then been connected, defining multi-component ternary stability fields (in this case, line fields). On each horizontal line of this multi-diagram triangle the same overall composition is found (the same Mg content and the same total... 

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