Defining a Pulley Assembly Defining a Pulley Assembly

A pulley assembly is simply a set of connectors connected with pulleys. Such an assembly is defined by the command


     ASSEMBLY PULLEY, PUL_NAME, EL(1), ........, EL(i)

Here, PUL_NAME is the name you wish to give to the pulley assembly, and EL(i) are previously defined connector element names. The connector elements must be either H_CAT (without the exact option) or B_CAT elements. If one has a B_CAT element, then it must be the last element of the assembly. In essence, a ASSEMBLY PULLEY assembly is a single line which passes through n-1 pulleys. If all of the elements are H_CATs, then the computation is exact, and all of the properties of each segment of each connector are properly accounted for. If, however, one has an assembly with a B_CAT element, then the idealization is exact only when the size of the wire for the H_CAT element is the same as the top segment of the B_CAT. Here, also, any additional springs on the H_CAT element will be ignored. These elements can be used in any way that H_CAT or B_CAT connector can be used. In particular, the &CONNECTOR command can be used to change the length of the first segment or the change the activity of the element.