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Vibrating system with continuously variable frequency and amplitude, in particular for shaking tables, dynamic materials-testing machines and the like
Vibrating system with continuously variable frequency and amplitude, in particular for shaking tables, dynamic materials-testing machines and the like
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机译:具有连续变化的频率和振幅的振动系统,特别是用于振动台,动态材料测试机等
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946,589. Testing machines. W. & T. AVERY Ltd. Jan. 23, 1961 [Jan.22, 1960], No. 2538/61. Heading G1S. A vibrating system for shaking tables or dynamic testing machines has a variable frequency and amplitude. Table 3 is attached to rod 2 secured to a table 8, 9 through a springy membrane 1. The table is vibrated by activator 6 and frequency is varied by introducing pressure medium into cavity 11 and forcing vibrating membrane 1 against sides 8b thus reducing its effective area. Other embodiments in which a spring element is braced against a fixed shape are shown. The embodiment shown in Fig. 1 is a shaking table and that in Fig. 5 a dynamic testing machine.
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