JP2985599B2 - Rocket head test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocket used for simulating a strength test of a head end plate of a lower motor in a rocket in which a lower motor is separated by pressure of gas ejected from an upper motor. The present invention relates to a head test apparatus.

[0002]

2. Description of the Related Art Generally, in a rocket having at least two motors, a tail of an upper part and a head of a lower part are connected by a separation nut, a Maruman band or the like, and a spring is interposed therebetween. The upper and lower stages are separated by the repulsive force of the spring together with the release of the connection.

Further, as shown in FIG. 3A, an upper motor A and a lower motor B are connected by a Marman band M, and as shown in FIG. In some cases, the lower motor B is separated by the pressure of the gas ejected from the motor A. In this case, there is no need to provide springs between the upper and lower motors A and B for applying a separating force.

[0004] Such a separation method of a rocket interstage using a jet gas is described in, for example, page 460 of “Aerospace Engineering Handbook, supplemented edition” issued by Maruzen on April 25, 1983. Are listed.

[0005]

By the way, in a rocket of the type in which the lower motor is separated by the pressure of the gas ejected from the upper motor, the high-temperature ejected gas collides with the head end plate of the lower motor. It is necessary to conduct a strength test of the head plate sufficiently. In other words, if the head gasket buckles due to the escaping gas, or if the head glass plate is melted and a hole is formed in it, the pressure applied to the head glass plate becomes uneven, for example, the lower motor is And become twisted,
This is because there is a possibility that the separating movement may be adversely affected.

[0006] However, it is very expensive to use an actual motor for a test, and even if an attempt is made to measure the pressure applied to the head head plate, the measuring instrument may be destroyed by the heat of the ejected gas. Since it is extremely difficult to confirm the relationship between the pressure due to the ejected gas and the buckling or dissolution generated in the head end plate, there has been a demand for a head plate test capable of obtaining reliable data.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional situation, and has been carried out as a simulated test for a rocket in which a lower motor is separated by the pressure of the gas discharged from an upper motor. It is an object of the present invention to provide an end plate test apparatus capable of confirming the relationship between the pressure caused by the pressure and the buckling and melting generated in the head end plate of the lower motor receiving the pressure.

[0008]

SUMMARY OF THE INVENTION A rocket head plate test apparatus according to the present invention simulates a strength test of a head motor head plate of a lower motor in a rocket in which a lower motor is separated by pressure of gas ejected from an upper motor. A head test apparatus for a rocket for performing, comprising an upper motor, a pressure vessel having a dummy head opposed to a nozzle outlet of the upper motor, and a pressure sensor for detecting the pressure in the pressure vessel in the pressure vessel. The configuration is provided, and the above configuration is used as means for solving the conventional problem.

[0009]

In the rocket head plate testing apparatus according to the present invention, the gas jetted from the upper motor collides with the dummy head plate of the pressure vessel, and the pressure in the pressure vessel changed by the pressure sensor is provided by the pressure sensor provided in the pressure vessel. By detecting, it is possible to measure the pressure applied to the dummy head while protecting the pressure sensor from the ejected gas.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIG. 1, the rocket end plate test apparatus includes an upper motor A having a solid propellant G loaded therein.
And a pressure vessel 2 having a dummy head plate 1 facing the outlet of the nozzle N of the upper motor A, and a pressure sensor 3 for detecting the pressure in the pressure vessel 2 is provided below the pressure vessel 2. Further, a motor pressure sensor 9 is provided in the upper motor A, and the pressure sensor 3 and the motor pressure sensor 9 are connected to a pressure evaluation circuit 10.

The upper motor A is provided with an outer cylinder 4 that covers the outer periphery of the nozzle N. On the upper and lower sides of the pressure vessel 2, cylinders 5 and 6 simulating a rocket body are attached, and the outer cylinder 4 of the upper motor A and the upper cylinder 5 are connected by a Marman band M. . This Marman band M does not release the bond during the test.

Further, an insulation 7 used for the head head of the actual lower motor is attached to the surface of the dummy head 1, and the dummy head 1 is supported in the pressure vessel 2 from the inside of the vessel. A stay 8 is provided. In addition, a support device for the upper motor A and the pressure vessel 2 are provided.

The rocket end plate test apparatus having the above-described configuration ignites the solid propellant G of the upper motor A, so that the gas ejected from the nozzle N (combustion gas) is supplied to the pressure vessel 2.
And the pressure in the pressure vessel 2 that changes due to the collision is detected by the pressure sensor 3 provided at the lower portion of the pressure vessel 2 and the pressure in the upper motor A is detected by the motor pressure sensor 9. The data from the sensors 3 and 9 are analyzed by the pressure evaluation circuit 10.

FIG. 2 is a graph showing pressure changes in the upper motor A and the pressure vessel 2. The pressure in the upper motor A shown by the dotted line rises relatively slowly after ignition, shows a sudden increase in thrust, and then becomes substantially constant. Further, the pressure in the pressure vessel 2 indicated by the solid line rises due to buckling of the dummy head 1 (indicated by P1) before the pressure in the upper motor A sharply increases, and further increases in the upper motor A. Immediately before the pressure becomes constant, the dummy head 1 rapidly rises due to the destruction of the dummy head 1 (indicated by a symbol P2).

In the head test apparatus, buckling or melting occurs in the dummy head 1 due to the pressure of the jetted gas. The pressure change on the surface of the dummy head 1 due to the buckling or melting is determined by a pressure vessel. Pressure sensor 3 as pressure change in 2
In this case, since the pressure sensor 3 is provided at the lower portion of the pressure vessel 2, the pressure sensor 3 is not affected by the jet gas at all.

In the head test apparatus, the material and various dimensions of the dummy head 1 are set so as to correspond to the head head of the actual lower motor, and buckling and melting due to the pressure of the jet gas are performed in the above test. After confirming the occurrence, the test data will be used for designing the actual head end plate. In addition, it is needless to say that the cost is lower than when an actual lower motor is used.

[0018]

As described above, according to the rocket end plate test apparatus according to the present invention, the head end plate of the lower motor in the rocket of the type in which the lower motor is separated by the pressure of the gas ejected from the upper motor. The strength test is simulated, and the pressure generated by the ejected gas and the dummy head (the head plate of the lower motor) receiving the pressure are generated in a state where the heat of the ejected gas does not affect the pressure sensor. The relationship between buckling and dissolution can be confirmed, whereby reliable test data can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rocket end plate test apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing pressure changes in an upper motor and a pressure vessel.

FIG. 3 is a cross-sectional view showing a state (a) at the time of coupling and a state (b) at the time of separation in a rocket in which the lower motor is separated by the pressure of gas ejected from the upper motor.

[Explanation of symbols]

 A Upper motor N Nozzle 1 Dummy head 2 Pressure vessel 3 Pressure sensor

Claims (1)

(57) [Claims] 1. A rocket head test apparatus for simulating a strength test of a head end plate of a lower motor in a rocket in which a lower motor is separated by a pressure of gas ejected from an upper motor. And a pressure vessel having a dummy head facing the nozzle outlet of the upper motor, and a pressure sensor for detecting the pressure in the pressure vessel is provided in the pressure vessel.