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Vertical response calculating method of three-slide-block monorail flexible rocket sled

A calculation method and rocket sled technology, applied in calculation, design optimization/simulation, special data processing applications, etc., can solve problems such as difficult modeling and huge amount of calculation, and achieve strong engineering applicability, fast solution speed, and reliable power The effect of learning response results

Inactive Publication Date: 2016-11-02
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: the present invention overcomes the shortcomings of the prior art such as difficulty in modeling and huge amount of calculation, and provides a vertical response calculation method for a three-slider monorail flexible rocket sled, which has fast solution speed and strong engineering applicability. In the calculation process, the flexible deformation characteristics of the rocket sled body and the mass reduction effect of the rocket sled system due to fuel injection are considered, and the nonlinear contact problem caused by the orbital instability is considered, so a more reliable dynamics can be obtained response result

Method used

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  • Vertical response calculating method of three-slide-block monorail flexible rocket sled
  • Vertical response calculating method of three-slide-block monorail flexible rocket sled
  • Vertical response calculating method of three-slide-block monorail flexible rocket sled

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Embodiment

[0060] The embodiment of the present invention adopts a rocket sled model with three sliding shoes, such as Figure 5 shown. The heading overload curve is as Figure 6 As shown, the first 3 seconds is the acceleration segment. Divide five 5-DOF beam units, the test piece is divided into 1 unit, and the engine is divided into 4 units. The schematic diagram is shown in the figure. The section parameters and collision parameters of each section are shown in Table 1 below, and the gap between the sliding shoe and the track is taken as 1.5mm.

[0061] Table 1 Basic parameters

[0062]

[0063] Using Fortran language according to figure 1 The solution program is written according to the process, and the track irregularity value adopts two situations: the sinusoidal irregularity value and the actual measurement. The vertical acceleration response of the node obtained through the solution is as follows:

[0064] (1) For the sinusoidal irregularity value, that is, the track ir...

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Abstract

The invention discloses a vertical response calculating method of a three-slide-block monorail flexible rocket sled. Bearings of the rocket sled are analyzed, and a rocket body is dispersed into finite element beam models; structural vibration, caused by unsmoothness of a rail, of the rocket sled and the rail is taken into consideration and a Hertz nonlinear contact model is used to calculate collision contact forces born by the rocket body in different time; and the whole-course vertical dynamic response of a three-slide-block monorail rocket sled system within given time is calculated by utilizing a central difference value method. In the calculation process, flexible deformation characteristic of a rocket sled body and a quality reduction effect, caused by fuel ejection, of the rocket sled system are taken into consideration, the nonlinear contact problem caused by that the rail is unsmooth is also considered, and thus, a more reliably dynamic response result can be obtained.

Description

technical field [0001] The invention relates to a method for calculating the vertical response of a three-slider single-track flexible rocket sled, involving the use of the hertz contact model to solve the collision contact force and the Newmark algorithm for dynamic numerical calculation, thereby realizing the dynamic contact force of the rocket sled on an uneven track Computational methods for solving and efficient and fast prediction of vertical dynamic response. Background technique [0002] A rocket sled is a test tool that uses a rocket engine as power to run along a specially constructed track. The rocket sled test is less affected by the volume, shape and mass of the test piece. Full-scale components as large as hundreds of kilograms and scaled models as small as tens of grams can be tested on the rocket sled. When the track is long enough, when engines with different thrusts or a combination of different numbers of engines are used as the power source of the skid c...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/367
Inventor 王晓军田靖军王磊管闯闯马雨嘉
Owner BEIHANG UNIV
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