RU2648297C2 - Equipment complex for measuring shock wave loads on inclined bottom in test pool - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: device includes a pool equipped with a wave generator, a wave generator, a wave generator and an inclined bottom to which a unit of sensors is attached for measuring loads from impact of waves. A photo-video equipment is installed in the wave-breaking zone for recording the destruction process. Readings from the wave graphs, sensors and image from the photo-video equipment are synchronized in time and recorded on a computer.

EFFECT: possibility for registering and processing the obtained values in real time.

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Description

The invention relates to experimental hydromechanics of marine engineering structures and relates to methods for testing the transformation of waves in a test (wave) pool on an inclined bottom and equipment for its implementation.

A well-known experimental pool containing a rectangular bowl filled with water, a wave producer mounted along one of the two sides of the bowl, and a wave absorber located along the opposite side of the bowl with respect to the wave producer (patent for invention RU 2460666, published April 10, 2012, IPC G01M 10/00 )

A known method of measuring the parameters of a shock wave, based on measuring the pressure and velocity of the front of the shock wave by sensors, performed by ed. St. USSR N 934792, class G01L 23/00. This measurement method consists in the fact that along the path of propagation of the shock wave in the test medium, a capacitive and resistive sensor is sequentially arranged. The pressure at the front of the shock wave is judged by the voltage jump in the general sensor switching circuit, and the speed of the shock wave front is judged by the time between the jump and the voltage pulse of the capacitive and resistive sensors. To determine (find) all unknowns in an experiment, two parameters are measured: pressure and wave velocity of a substance. Both of these parameters are fixed on one beam of the oscilloscope connected by its input to the two mentioned sensors.

The disadvantage of this method is the inability to record to a computer and process the obtained values in real time.

There are known recommendations for conducting field observations and studying the fastenings of slopes of soil structures and coastal slopes (P 74-2000). To measure shock wave pressure, a block (cassette) of membrane sensors is used, which is moved on a slope. The distance between the sensors is 0.1 of the wavelength.

The key disadvantage of this method is that this method is proposed for field observation and is not intended for physical modeling in the experimental pool, i.e. the process of generating waves of specified parameters is not provided.

The purpose of the invention is the measurement of the impact force during the destruction of a wave against an inclined bottom, its photographic fixation and measurement of wave parameters before destruction.

This goal is achieved through the additional installation of an inclined bottom in the experimental (wave) pool, the attachment of a movable block of membrane or strain gauge sensors to the inclined bottom, the additional installation of photographic equipment for photofixing wave transformation on the inclined bottom and synchronization of all received data on a computer.

The complex of equipment for measuring shock wave loads on an inclined bottom in the experimental (wave) pool includes (Fig. 1) - Complex for measuring shock wave loads on an inclined bottom in the experimental (wave) pool:

- wave pool (1) containing a wave producer (for example, pneumatic type) (2);

- the working section (inclined bottom) (3) (where the sensor block (4) is located to measure the loads from shock waves, oriented perpendicular to the incident wave);

- wave suppressor (5);

- a block of filter signals from sensors (7);

- analog-to-digital converter (8);

- personal computer (9);

- a pipeline for supplying water from the quench zone to the wave generation zone (10);

- an observation window with installed photo and video equipment for recording wave collapse on an inclined bottom (11). Instead of installing a viewing window, a transparent sealed container rigidly fixed to the pool wall can be used.

The complex for measuring shock wave loads on an inclined bottom in the experimental (wave) pool is designed (functions) as follows.

In the wave pool (1), the wave is generated by the wave producer (2). Depending on the type of wave product, the wave can be generated with the specified characteristics (length, height, period) and controlled by a computer, or in the case of a simple design of the wave product (lack of the ability to connect to a computer), the wave is generated with the characteristics specified by the manufacturer.

- The specified characteristics of the wave are checked by two waveographs, if they do not match the specified ones, the control signal supplied to the wave producer is automatically corrected.

- At the inclined bottom (3), a wave collapses, while the measurement of the impact force from the wave collapse is carried out by the sensor unit (4). The possibility of rigid fixation of the sensors on an inclined bottom in the area of the wave collapse.

- The signals from the sensors are fed to the filter unit (7), where they are amplified and suppressed by extraneous noise. The signal converted in the filter unit (7) is supplied to an analog-to-digital converter (for example, NI-USB 6008) (8).

- After the analog-to-digital converter, the signals are transmitted to a personal computer (9). Where is their processing followed by recording. The wave breakdown is recorded through the viewing window (11) with photo and video equipment connected to a personal computer (9).

- All data obtained from the measuring equipment, wave characteristics from waveographs (6), the impact force of waves from sensors (4) and the wave crest shape at the time of collapse, recorded from photo and video equipment (11), will be synchronized on a computer. When a wave is destroyed, some of the waves are quenched against an inclined bottom, forming reflected waves, and some are absorbed by a wave attenuator (5). To eliminate the influence of reflected waves in the automatic mode, a constant correction of the signal supplied to the wave producer occurs (2). The zone of wave generation and wave suppression is connected by a pipeline (10), if necessary, a pump can be installed on the pipeline to pump water from the quench zone.

Thus, the complex of equipment for measuring shock wave loads on an inclined bottom in the experimental pool allows you to record all the necessary data, namely: the profile of the wave at the time of collapse, the strength of the shock and wave characteristics before collapse.

Claims (1)

A set of equipment for measuring shock wave loads on an inclined bottom in an experimental (wave) pool, including a wave pool, a wave producer, a working section (inclined bottom), a block of sensors for measuring loads from shock waves, a wave suppressor, a block of filter signals from sensors, analog-digital a converter, a personal computer, a pipeline for supplying water from the quench zone to the wave generation zone, an observation window with installed photo and video equipment for recording wave collapse and characterized in that this complex provides it is possible to simultaneously measure the force of impact when the wave is destroyed on an inclined bottom, to make photofixation and to measure the wave parameters before the destruction.

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