The recent military parade held in Zhu Rihe and the release of "Wolf Warrior 2" have captured global attention. China demonstrated its growing military prowess to the world, showcasing advancements that have been closely monitored by international observers. Despite not having been tested in actual combat scenarios, the strides in military development are undeniable. Land and naval forces have seen significant progress, while aerial capabilities continue to evolve. With the official entry of the J-20 fighter jets into service this year, adapting to shifting geopolitical landscapes has become crucial. Plans for the deployment of advanced long-range strategic bombers and the establishment of trinity military formations are on the horizon.
The "novelty" of the new bomber lies primarily in its unique launch architecture, particularly highlighted by the number of suspension points. It must achieve rapid reloading while maintaining safety and reliability. Throughout the design process, the expert team responsible for fighter development iterated on numerous concepts, yet they struggled to meet the stringent reliability standards. Recognizing the North Union's extensive expertise in custom equipment for high-precision military applications, the team sought their collaboration. Following a rigorous technical discussion, the North Steel Technical Team devised an innovative solution—utilizing high-precision angles to automatically compensate for the reliability of the system. This breakthrough resolved longstanding challenges for military engineers and was successfully integrated into the new strategic bomber.
The core technical parameter of the rotary mechanism prototype focuses on angular rotation positioning accuracy. This device serves a critical role in verifying functionality: confirming whether the rotary mechanical structure fulfills actual launch requirements and whether the software control system can effectively manage this mechanism. Mechanically and electrically, experiments are conducted to ensure proper operation. The rotary roller operates in two directions, with an angular error of ≤±3arc.min after every 60° rotation. Achieving such precision is essential, as any deviation could compromise operational integrity in real-world scenarios.
The servomotors and reducers employed in the drive mechanism are specially designed units with unique functionalities. Their performance has been validated, but the backlash between the gears of the reducer remains a challenge. At 7arc.min, this backlash becomes a critical factor influencing rotational positioning accuracy. Even if other transmission mechanisms maintain zero error, meeting the rotational positioning requirements proves impossible. To enhance the rotational positioning accuracy, developing a reducer with reduced backlash would be ideal, but such efforts involve prohibitively high costs, lengthy R&D cycles, and limited practical feasibility.
[Insert Figure 1: Overall structure of the device]
The drive mechanism comprises a servomotor, reducer, connecting flange, rotary transformer, slewing bearing adapter plate, slewing bearing, adapter plate shaft, electric push rod, and pin shaft guide. The expert team programs the PLC, servomotor, reducer, resolver, and other components into a closed-loop control system. The PLC sends a pulse signal instructing the motor to drive the reducer through a 60° rotation. The reducer’s output shaft ensures precise angular alignment via a key and adapter shaft, which is fixed to the resolver’s rotor and ultimately fed back to the PLC via the resolver’s angular feedback. Closed-loop control is achieved through corrective drive adjustments, enabling the system to maintain a rotation angle of ≤60°±3arc.min under steady-state conditions.
[Insert Figure 2: Cross-section of the core drive mechanism]
When the rotation direction changes, the PLC halts motor movement at 60°, triggering the electric push rod to extend the positioning pin shaft along the pin axis guide. The pin shaft, featuring a chamfered tip, acts as a conical guide, ensuring accurate insertion into the adapter plate shaft’s positioning hole despite a 7 arc.min reducer backlash. Once the pin shaft’s minimum end is inserted, the thrust generated by the electric push rod overcomes resistance, automatically adjusting the rotating shaft disk. The final angular accuracy depends on the indexing precision of the rotating disk shaft, the tolerance of the positioning hole’s inner diameter, and the OD tolerances of the positioning pins, all guaranteed by machining processes. Consequently, the angular accuracy post-alignment satisfies ≤±3 arc.min.
Balancing military demands with cost-effective solutions presents a unique challenge. While reducing the reducer’s backlash remains unfeasible, minimizing its impact on angular positioning is possible. During initial operation and continuous unidirectional rotation, the reducer’s backlash does not affect angular accuracy. However, upon directional change, a maximum 7arc.min error occurs due to the backlash. This issue is addressed mechanically and externally through automatic correction. Without altering the reducer model or imposing stricter backlash constraints, no unnecessary investments were made in low-backlash high-precision reducers. Instead, a set of mechanical positioning pins was added. The forced positioning not only achieves angular rotation accuracy of ≤±3arc.min but also incurs minimal additional costs. The gyroscopes provided by the North Steel Union offered invaluable ground testing data for the new strategic bomber's development.
Upon the official adoption of the strategic rotary launcher, fighter aircraft flexibility increases, costs decrease, and rapid response capabilities improve. Unlike conventional weapon configurations, this launcher enables mounting of diverse payloads without modifying existing frames, addressing complex mission requirements. In the future, this launcher design will also find application in the army and navy, amplifying its combat effectiveness significantly.
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