Dynamometer towing truck

 

(57) Abstract:

Usage: experimental hydromechanics ship, concerns the design of the towing dynamometers for testing models of ships and self-propelled their testing in a rigid harness. Essence: dynamometer towing truck contains installed on her device with a sensitive element-binding model ship towing carriage, and mounted on the towing carriage of cargo associated with the model and have the ability to move relative to the tow truck in the direction opposite to the possible movement of the model relative to this truck, and the amount of weight selected from the conditions: m = i(M+M-K), where m is the mass of the load, M is the mass of the model, M is the added mass of water, K is a constant set empirically for a particular dynamometer, i - gear ratio connection between the model and the mass. 3 Il.

The invention relates to experimental hydrodynamics of ship and for the design of the towing dynamometers for testing models of ships and self-propelled their testing in a rigid harness.

Known dynamometer towing truck (G. E. Pawlek eusto sensitive element, linking the model of the vessel with a tow truck. However, this dynamometer has inertial error in the measurements with its use.

The technical result from implementation of the invention is to eliminate the inertial measurement uncertainty using a dynamometer towing truck.

This result is achieved by the fact that the dynamometer towing truck contains installed on her device with a sensitive element-binding model ship towing carriage, and mounted on the towing carriage of cargo associated with the model and have the ability to move relative to the tow truck in the direction opposite to the possible movement of the model relative to this truck, and the amount of weight selected from the condition:

m = i(M+M-K)

where m is the mass of the cargo;

M is the mass of the model;

M is the added mass of water;

K is a constant set empirically for a particular dynamometer;

i - gear ratio connection between the model and the mass.

In Fig. 1 shows the construction of the dynamometer towing truck; Fig. 2 - section a-a of Fig. 1; Fig. 3 - section b-B of Fig. 1.

Model court is rastenii farm. The lever 5 has an axis of rotation 6, located on the movable frame 7. The sensing element 8, for example, in the form of a linear displacement transducer in the frequency of the AC fixed on the movable frame 7 and pivotally connected with the lever 5 by means of thrust 9. On the upper part of the lever 5 is fixed removable mass 10, and a removable spring 11, the other end fixed to the movable frame 7, which also contains the restrictors 12 of the lever 6 and the fixed portion of the hydraulic damper 13, the movable part which is mounted on the lever 5. The calibration mechanism of the sensing element 8 consists of two pulleys 14 mounted on the movable frame 7 and thrown over them threads, one end attached to the lever 5, while the other end carries the suspension 15, where the calibration loads 16. On one of these pendants is the same load that is used to trim the main part of the towing resistance.

The movable frame 7 is pivotally suspended on two N-shaped rods 17, the upper hinge which is fixed to a stationary frame (not shown). This frame is attached forcipate electromagnetic brake 18, which interacts with the brake plate 19 mounted on the movable frame 7. Modignani spring-shock-absorber 21-stiff working in tension and compression, and includes a rubber element.

Fixed frame mounted on the towing carriage (not shown) clamp nodes with height adjustment and, in addition, suspended by a rope thrown across the blocks and having at the other end of the counterweight.

The restrictors 12 is electrically isolated from the frame 7 and in contact with the measuring arm 5 is designed to close the electrical circuit, respectively, the front or rear bulb indicator. The sensing element 8 is electrically connected to an electronic counter, which displays on its screen the average frequency during the passage of the model of the test section or for a specified time.

The mass 10 is determined by the formula:

m = i(M+M-K),

where m is the mass of the cargo;

M is the mass of the model;

M is the added mass of water;

K is a constant set empirically for a particular dynamometer;

i = c/d - ratio relation between the model of the vessel 1 and a weight of 10;

with the length of the lower arm of the lever 5;

d - the distance from the center of the mass 10 to the axis 6.

Thus the value of K can be defined as the value of some who by the mass 10 is in equilibrium. The value of the attached mass M is determined by the directories.

In the experimental instance of the dynamometer axis 6 is formed by two pairs of cross located flat springs, and hinges 4 and the hinge Shaft is made on the ball.

The dynamometer is operated as follows.

Before the beginning of experiments are spring 11 such rigidity that the period of the angular oscillations of the measuring arm 5 together with model 1 and installed mass m was equal to a specified value, for example 2 C. next, the calibration of the sensing element 8. Just before work run on the left (rear) suspension is placed the load, equal to the expected towing resistance given gear ratio. Turns left (rear) light. Is the acceleration of the towing truck, then after some time the light bulb goes off. The towing force is transmitted from the truck to the movable frame 7 through the absorber 21, which, in addition, isolates the load from the horizontal vibration of the towing truck. Hinge 2 Cardan unloads dynamometer from possible Grenada moments acting on the model 1. After braking again sahavikasa from the mass model 1 adjusts the stiffness of the springs 20. Before the start of the switches on the brake 18, and then begins to generate excitement in the pool. After acceleration, the brake 18 is automatically switched off, the model of the vessel 1 together with the movable frame 7 begins to feel a longitudinal horizontal rocking about some mean position. Immediately before the braking of the towing truck automatically brakes 18, which prevents, as during acceleration, it is possible strike hard the moving frame 7 about their limiters.

The use of a dynamometer with mechanical inertia compensator virtually eliminates inertial error in tow and self-propelled tests of models of ships, including when tested with acceleration and deceleration. This significantly increases the accuracy of the experiment opens the possibility of setting new, previously unavailable research in existing pools for conducting experiments, for example in long pools of experiments requiring great precision that was previously impossible, and in the short pools - production standard self-propelled testing models of large transport vessels. They are characterized by a high ratio of displacement to the towing resistance and, hence, the big C self-propelled tests in the short pools for experiments unreliable.

In addition, the proposed dynamometer will reduce the length and number of runs of the model that reduce the cost of the study. When designing new pools for the experiments he will shorten their length, which will reduce the cost of construction.

Dynamometer towing truck containing installed on her device with a sensitive element-binding model ship towing carriage, characterized in that it is made with installed tow truck cargo associated with the model and have the ability to move relative to the tow truck in the direction opposite to the possible movement of the model relative to this truck, and the amount of weight selected from the condition

m = i(M+M-K),

where m is the mass of the goods;

M the mass of the model;

M is the added mass of water;

To a constant value established empirically for a particular dynamometer;

i gear ratio connection between the model and the mass.

 

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