SU987435A1 - Device for measuring wave pressure on water-development works models - Google Patents

Description

The invention relates to hydraulic construction and can be used in experimental studies of the force effect of waves on models of underwater and intersecting with the free surface of water marine hydrotechnical structures.

SRI.

A device for measuring the wave pressure in a model of hydraulic structures, comprising a model installed in a wave tray and load sensors C13, is known.

The drawback of the device is the sequential measurement of the horizontal and then vertical components of the wave narpysKKf associated with the rearrangement} of the model to the appropriate position.

It is also known a device for measuring wave pressure on a model of hydraulic structures, including an edel mounted above the bottom of a wave tray, interacting with sensors of horizontal and vertical loads 2.

A disadvantage of the known device is the need to make a hollow model to accommodate

sensors, which complicates the measurement process and reduces its accuracy.

The purpose of the invention is to simplify and improve the measurement accuracy.

This is achieved by the fact that the model is equipped with mounting sockets placed on the upper and lower faces of the model in which horizontal load sensors are installed, and the vertical load sensors are connected to the model by flexible wires. And between the model and the bottom of the tray is placed elastic bandage.

FIG. 1 shows a device for measuring the wave effect on the model of hydraulic structures in FIG. 2 is a section A-A in FIG. one; in fig. 3 shows a section in FIG. 1 in FIG. 4 - oscillographic fragment

20 records.

On the sides of the wave tray 1, the beams 2 are fixed with a rod 3 installed with the possibility of vertical movement by means of a rack pair 4.

Claims (2)

In example 5, made in front of 6 tray 1, a plate 7 is installed. On the plate 7 V and the end of the rod 3, sensors 8 of the horizontal load 30 are fixed, which are placed in slots 9 attached to the model 10 to its upper and lower faces. The top face of model 10 is attached to the lath 11. The beams 2 are fixed by means of a device 12 for fixing and adjusting the model 10 and vertical suspensions 13 to 14 sensors of vertical loads, to which a model 10 is suspended by means of calibration rings 15, tg 16 and bars 11 between the model 10 and the bottom of the tray 1 is blocked by a corrugated ban Even 17. The device works as follows. Investigated model 10 hydraulic structures with the help of the device 12 is installed in a strictly horizontal position so that the head of the lower sensor 8 is in line with the nest 9 of model 10 in the cavity of which a thick lubricant is preliminarily introduced, eliminating friction between the head of the sensor 8 and the nest 9. 3, the head of the horizontal load sensor 8 is introduced into the socket 9 of the model 10, into which thick grease is also introduced. The mutual positioning of the model 10 and the sensor heads 8 of the horizontal load does not prevent the model 10 from moving freely during the experiment in the vertical direction. After the described preparation steps for the experiments, the gap between the bottom of the tray 1 and the model 10 is covered by a rubber band 17 that prevents pulsation pressure from penetrating contact of the waste surface of the model 10 and the bottom of the tray 1 in the case of wet 5. The sensors 14 are vertically loaded with calibration rings 15 that provide strictly the vertical position of the tarry load. Obviously, this circumstance has a positive effect on the reliability of the hot factors of annular sensors 14 vertical loads. After tarirozki sensors 14 vertical load, on the upper face of the model 10 in various places set the control masses, which register the sensor or 14 vertical loads with almost no loss. Calibration of horizontal load sensors 8 is carried out by applying a calibration load at the levels of the heads of the upper and lower sensors 8.. When calibrating the total sensor of the mebtal loading mountains (not shown), the calibration force is applied at a point equal in height to the model from the heads of the upper and lower horizontal loading sensors 8. The correctness of the obtained calibration coefficients is confirmed by the registration of the reference mass applied at various points along the height of the model 10 by both the upper and lower sensors 8 and the sensor total-. Noah load. During the experiment, when the crest of a wave is distributed symmetrically over the surface of the upper face of model 10 of the structure, the vertical component of the wave load will reach its maximum value and will be directed vertically downwards as the wave trough passes, the maximum value of the vertical load will be the opposite Sign. The 16 model 10 gigabytes were attached to the latter by means of two overlapping strips 11 located on the surface of the model 10. This technique eliminated the longitudinal trim of the model 10 when the wave front passed, and made it possible to obtain objective information about the experimental values of the horizontal and vertical components of the wave load, which , in turn, allows to proceed to the determination of the overturning moment by calculation. In the case when the wave crest is located at a distance of D / 4 from the vertical axis of symmetry, the horizontal component of the wave load will be maximal due to its inertial nature. This can be traced on a fragment of an oscillographic record (Fig. 4) obtained in the process of experiments when studying the force effect of the waves of the studied structure model. The upper curve and belongs to the upper sensor 8 horizontal load. The curve belongs to the lower horizontal load sensor 8. Curve with belongs to the total horizontal load sensor. Curves d and e belong to the sensors 14 vertical load. Two capacitive waveguides were used to measure the wave oscillations of the excited surface. They are represented (Fig. 4) by curves f and. The reliability of the total P load of the horizontal load was mutually controlled by the indications of the upper and lower sensors Bf as well as the total sensor of the horizontal load. At the same time, the discrepancies did not exceed 1-2%, which is within the limits of the accuracy of the measurement data. The proposed device, capable of synchronously recording the vertical and horizontal components of the wave pressure forces with a sufficient degree of accuracy, with the help of which we can estimate the total tilted moment on the structure model, can be widely used for laboratory research. As a result of using the device, the accuracy of the experimental values. vertical wave load has been increased by 20-30%, and the number of experiments has been halved. Claim 1: A device for measuring wave pressure on a model of hydraulic structures, including a model installed above the bottom of a wave tray and interacting with horizontal and vertical sensors on loads , in order to simplify and improve the measurement accuracy, the model is provided with mounting sockets placed on the upper and lower grants of the model in which the sensors are installed horizontal load, and vertical load sensors are connected to the model with flexible wires. 2. A device according to claim 1, characterized in that an elastic bandage is placed on the m5 hell of the Yodel and the bottom of the tray. Sources of information taken into account in the examination 1. USSR author's certificate 930099, cl. Е 02 В 3/06, 1950. 2, Seventh.Annia1 Offshore Thechnology Conference. N. Hbgben R.G. Standing. Experience in Computing Wave Loads on Large Bodies, Boston, 1975 (prototype). f2 J fJf  y - ff mn 1 Aa FIG. fff // QQO O.