V.2 No 1 |
53 |
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On complex resonance vibration
systems calculation |
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To
analyse the vibration process arising in the elastic line having the resonance subsystems
which is presented in Fig.
1, write the solutions in their general form. In case of forced vibrations they have
the following form: for the
periodical regime at g < 1 |
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(9) |
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for the
aperiodical regime at g > 1 |
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(10) |
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and for
the critical regime at g = 1 |
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(11) |
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where , , ; i
is the momentary displacement of the ith
subsystem and 0
is the initial phase of external action. The presence of the resonance pattern of subsystems
naturally leads to the features appearing in solutions (9) (11). First of all, the
presence of resonance peaks in the regularity M() makes impossible to divide exactly the
frequency band into subcritical and overcritical regimes. The elastic line will multiply
undergo one of these regimes dependently on the value M. The more, the possibility
of negative M causes the additional, fourth vibration regime corresponding to the
complex value of g. The solution for this regime, which we will name
the complex aperiodical regime, will be the following: |
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(12) |
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where , . As we
can see from (12), in the complex aperiodical regime the vibration amplitude |
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(13) |
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varies
differently, dependently on the subsystem number i. |
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