Multifunctional tester for researching internal pressure pulsation mechanism

Abstract

The invention discloses a multifunctional tester for researching internal pressure pulsation mechanism. Two same big cylinders are connected in series by a round baffle plate of which the middle is provided with a pore; the side surface is installed on a bottom plate; a big piston is respectively installed in two big cylinders; two sides of the round baffle plate form two hollow cavities capable of changing volume, and the volume of the hollow cavity can be controlled by adjusting piston position; a small piston is embedded into one big piston, one end of the small piston extends into the hollow cavity, and the other end is connected with an excitation head of an electromagnetic vibration exciter; a power amplifier controls the electromagnetic vibration exciter to excite the small piston,and air pressure in the hollow cavity produces external pressure pulse; the pore applies dynamic pressure to air in the other hollow cavity so as to produce internal pressure pulse; a differential pressure transducer synchronously measures air pressure in two hollow cavities to obtain the dynamic change rule of the internal pressure under the action of specified dynamic external pressure, and thus a parameter contrast test can be developed. The invention is suitable for developing the test research of the internal pressure pulsation mechanism.

Description

technical field [0001] The invention relates to a test device in the technical field of structural wind engineering, in particular to a multifunctional test device for studying the mechanism of internal pressure pulsation. Background technique [0002] my country is a country with frequent wind disasters. In recent years, a large number of houses have collapsed and casualties have been caused by wind disasters. The survey shows that the sudden increase of internal pressure caused by the opening of the wall of the house under the action of the typhoon is the key reason for the damage of the house. When the wall is opened, the airflow penetrates into the house under the action of high external pressure to compress the internal air and increase the internal air pressure. The large airflow gushes out from the orifice again, forming a nonlinear dynamic system in such a reciprocating manner. It can be seen that the study of the nonlinear dynamic mechanism of wind-induced internal ...

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Problems solved by technology

Foreign scholar Holmes conducted theoretical and experimental research on the dynamic mechanism of wind-induced internal pressure in buildings, and proposed a nonlinear equation for internal pressure response by referring to the Helmholtz resonance theory, which laid the foundation for in-depth research on the mechanism of internal pressure fluctuations. Unfortunately, It is the nonlinear equation proposed by Holmes that cannot fully describe the complexity of internal pressure fluctuations. Although many scholars have proposed revised equations since then, no consensus has been formed so far, especially the problem of the value of the empirical coefficient in the equation is a long-term problem. wind engineering

The reason for this situation is that there is no experimental research device specifically for the mechanism of internal pressure pulsation, and it is impossible to conduct systematic research on factors such as internal volume, opening characteristics, and external pressure dynamic characteristics that affect internal pressure pulsation.

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