What is the source of vibration

2 answers:

7 0

Identifying the source of vibration by following the amplitude: the case of a company that thought the problem was a pump impeller, but, in fact, the problem was over 15-ft away and not a pump at all.

Many times we will bury ourselves in a problem looking at endless spectrums, waveforms, and machinery information in search of the source of a vibration problem, while forgetting the very basics of vibration.

Consider the following example at a large brewery. They had an unusual layout of three variable-speed pumps drawing water from a manifold system fed by two input pipes. When the production demand for water exceeded the capabilities of one pump, the second pump would be automatically started by a programmable logic control (PLC) system.

Accordingly, the two pumps would slow a bit until water demand again had both pumps running at near maximum capacity, when the third pump would kick in. Again, all three pumps would slow down to match demand. A major problem appeared when the second pump kicked in and the speed slowed. As the two pumps sped up, the vibration seemed to disappear. When the third pump kicked in and all three pumps again slowed down, the vibration was approaching 0.6-in/sec RMS.

Ber [7]3 years ago

6 0

Disturbance in configuration

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Suppose that prolog facts are used to define the predicates mother(m, y) and father(f, x), which represent that m is the mother

erastova [34]

Prolog languages are logics that are used when creating programs that require artificial intelligence.

The prolog rule to define the predicate grandfather(x, y) is grandfather(X,Y) :- mother(M,Y), father(X,M); father(F,Y), father(X,F)

<h3>How to determine the prolog rule</h3>

From the question, we have the following definitions:

mother(m, y): m is the mother of y
father(f, x): f is the father of x

For x to be the grandfather of y, then either of the following definitions must be true

m is the mother of y, and x is the father of m
f is the father of y, and x is the father of f

Using the above highlights, the prolog rule would be

grandfather(X,Y) :-

mother(M,Y), father(X,M);

father(F,Y), father(X,F)