The operational principle, the impulse force and terminal guidance laws of terminal correction mortar projectiles(TCMP) are researched in this paper, by using the TCMP simulation program, key techniques such as the ...The operational principle, the impulse force and terminal guidance laws of terminal correction mortar projectiles(TCMP) are researched in this paper, by using the TCMP simulation program, key techniques such as the miss distance influenced by the acting point of impulse force, the impulse force value, the correction threshold, and the number of impulse rockets are researched in this paper. And the dual pulse control scheme is also studied. Simulation results indicate that the best acting point is near the center of gravity, sufficient correction resources are needed, the miss distance is insentive to the correction threshold, increasing the number of impulse rockets properly is beneficial to increase the hit precision, the velocity pursuit guidance law has less miss distance, the change of the attack angle is milder and the transient time becomes less in the dual impulse control scheme. These conclusions are important for choosing parameters and impulse correction schemes designed for TCMP.展开更多
The system composition, the operational principle of terminal correction mortar projectiles (TCMP) and the concept planning design of TCMP are researched in this paper. An overall design and aerodynamic configuratio...The system composition, the operational principle of terminal correction mortar projectiles (TCMP) and the concept planning design of TCMP are researched in this paper. An overall design and aerodynamic configuration layout for TCMP are made in this paper, and its aerodynamic coefficients are calculated by using computational fluid dynamics (CFD) software. Test results of TCMP simulated ballistic projectiles indicate the designed TCMP can satisfy the interior ballistic demand and has a fine flight stability. The drag coefficients identified from the radar velocity-time data are in accord with the CFD computed results. According to the exposure frequency of the ground laser designator, a four-quadrant impulse correction scheme and a high exposure frequency impulse correction scheme are brought. The latter can calculate the target azimuth angle by counting the times of the facula passing through one quadrant. Simulation results also show that the guidance precision of the velocity pursuit is higher than that of the body pursuit, and the detector axis is less circuitous. Researches on the typical trajectory indicate that the terminal impulse correction can improve the hit precision of TCMP remarkably.展开更多
In this paper, an improved theory for determination of thc eigen-frequen cies of the flute is expounded. The theory is developed from a previous work in order that it can be extended to analyze the flute of a new type...In this paper, an improved theory for determination of thc eigen-frequen cies of the flute is expounded. The theory is developed from a previous work in order that it can be extended to analyze the flute of a new type, so called 'aligned double flute'. The acoustic character of the double flute is analyzed rigorously. The proce dure to calculate the correction of the effective length of the tube at exit terminal is in vestigated. Theoretical formulae to determinate the eigenfrequencies of the flute are derived. Correction caused by the warm flow are discussed. Two typical structures of the double flute are examined. It is shown that the experimental data are in good agreement with the theorctical results. It shows the present theory is delicate and reli able. It can servc as thc theoretical fundament for design or manufacture of the aligned double flute in practice.展开更多
基金Sponsored by the Ministerial Level Advanced Research Foundation (40406030101)
文摘The operational principle, the impulse force and terminal guidance laws of terminal correction mortar projectiles(TCMP) are researched in this paper, by using the TCMP simulation program, key techniques such as the miss distance influenced by the acting point of impulse force, the impulse force value, the correction threshold, and the number of impulse rockets are researched in this paper. And the dual pulse control scheme is also studied. Simulation results indicate that the best acting point is near the center of gravity, sufficient correction resources are needed, the miss distance is insentive to the correction threshold, increasing the number of impulse rockets properly is beneficial to increase the hit precision, the velocity pursuit guidance law has less miss distance, the change of the attack angle is milder and the transient time becomes less in the dual impulse control scheme. These conclusions are important for choosing parameters and impulse correction schemes designed for TCMP.
基金the Ministerial Level Advanced Research Foundation (40406030101)
文摘The system composition, the operational principle of terminal correction mortar projectiles (TCMP) and the concept planning design of TCMP are researched in this paper. An overall design and aerodynamic configuration layout for TCMP are made in this paper, and its aerodynamic coefficients are calculated by using computational fluid dynamics (CFD) software. Test results of TCMP simulated ballistic projectiles indicate the designed TCMP can satisfy the interior ballistic demand and has a fine flight stability. The drag coefficients identified from the radar velocity-time data are in accord with the CFD computed results. According to the exposure frequency of the ground laser designator, a four-quadrant impulse correction scheme and a high exposure frequency impulse correction scheme are brought. The latter can calculate the target azimuth angle by counting the times of the facula passing through one quadrant. Simulation results also show that the guidance precision of the velocity pursuit is higher than that of the body pursuit, and the detector axis is less circuitous. Researches on the typical trajectory indicate that the terminal impulse correction can improve the hit precision of TCMP remarkably.
文摘In this paper, an improved theory for determination of thc eigen-frequen cies of the flute is expounded. The theory is developed from a previous work in order that it can be extended to analyze the flute of a new type, so called 'aligned double flute'. The acoustic character of the double flute is analyzed rigorously. The proce dure to calculate the correction of the effective length of the tube at exit terminal is in vestigated. Theoretical formulae to determinate the eigenfrequencies of the flute are derived. Correction caused by the warm flow are discussed. Two typical structures of the double flute are examined. It is shown that the experimental data are in good agreement with the theorctical results. It shows the present theory is delicate and reli able. It can servc as thc theoretical fundament for design or manufacture of the aligned double flute in practice.