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Rifling depth is a very important parameter of howitzer barrel design, which has great influence on howitzer firing performance and security. At present, there are two types of barrel rifling depth design, which are 1.27mm depth rifling and 2.3mm depth rifling. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and the rifling depth of projectile. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and rotating driving side force when deep rifling howitzer and shallow rifling howitzer are used. This paper studies the extrusion stress between top surface of rifling land and bearing band of projectile and rotating driving side force when deep rifling howitzer and shallow rifling howitzer fires unguided projectiles and guided projectiles. It can be found by comparison that shallow rifling howitzer does better. It can be found by comparison that shallow rifling howitzer does better that deep rifling howitzer in barrel life and guided projectile firing security. Research of this paper will produce an important meaning to our nation’s next generation howitzer.

Forcing cone, whose function is mainly to accommodate bearing band of projectile, is an important design parameter of howitzer barrel design. Forcing cone’s taper directly influences engraving resistance of projectile and wear of starting part of rifling. So structure design of forcing cone is very important to barrel life. So structure design of forcing cone is very important to barrel life. This paper simulates nine types of forcing cone structure and analysis the results. Based on the simulation results, the best forcing cone scheme is closed. This research will provide support to our nation’s next generation 155mm caliber howitzer.

Whitelaw Reid's Ohio in the Civil War reveals the connection of the howitzers to the 5th. Reid noted: \"It being of the utmost importance to keep the enemy in the dark as to the preparations crossing the river at Chickasaw, Osterhaus, on the morning of the 26th, sent the trains with escort to Dickson Station, and with the entire division (the Fifth Ohio in advance) started before daylight for Tuscumbia, driving the enemy continually, occupying the town, capturing a number of prisoners, destroying large quantities of Rebel army supplies, and returning three days afterward. The name is pictured in reverse, which suggests this is a copy of a hard plate image or that the photographer made a paper print from the opposite side of the glass negative.

In the topology optimization design and strength check of a vehicle-mounted howitzer cab, it is necessary to obtain plenty of impact load laws under different firing conditions. How to obtain the impact load on the cab quickly is one of the challenges in the design of a vehicle-mounted howitzer. In this paper, the deep learning (DL) method is introduced to solve the impact load on the cab. A fast prediction method for cab impact load based on a ConvLSTM multidimensional feature neural network is proposed. The calculation of the impact load on the cab under different operating conditions is achieved, and the solving speed is close to the real-time level. The numerical examples show that the accuracy of the DL model is comparable to that of traditional computational fluid dynamics (CFD) simulation, but the solving time is on the millisecond level. The computational efficiency has been greatly improved, with the potential for offline training and online computing. When there is a slight change in the morphology of the cab, the proposed model remains applicable. The results can quickly provide load conditions for cab strength checking and topology optimization, help to shorten the development period of a vehicle-mounted howitzer, and lay the foundation for the construction of a digital twin model of a vehicle-mounted howitzer system.

At the docks everything was loaded onto a steamer (a captured German ship originally called the Alistair but now known as the Hunsgate), which already contained some Holt caterpillar tractors and 8in howitzers. The final test saw us navigating an overgrown lane, \"where much of the paint and the external driving mirror were removed by dense overhanging brambles\". [...]we said: \"However much Freight Rover tells its buyers that the Sherpa is a modern, all-singing, all-dancing van, this is simply not the case.

In order to reduce the force transmitted from the upper carriage of a Truck-mounted howitzer to the lower carriage, the upper carriage is optimized for structural parameters under the premise that the position of the trunnion chamber is allowed to change. Based on the secondary development function of ABAQUS, established the parametric modeling script of the upper carriage structural, and built the ABAQUS computing environment through the integration of Simcode components of the ISIGHT platform. The position parameters of the trunnion chamber on the upper carriage were selected as the design variables, and the maximum support reaction force was minimized as the optimization objective. The multi-island genetic algorithm was used to optimize the structure parameters of the upper carriage under multiple working conditions, and the global optimal solution was obtained. The optimization results meet the rigidity and strength requirements, and the optimization effect is obvious. This optimization method can be used in the design of the upper carriage structure, reducing the force transmitted from the upper carriage of the artillery to the lower carriage, and can provide a certain optimization space for the weight reduction of the lower carriage, and has engineering application value.

The muzzle blast overpressure induces disturbances in the flow field inside the crew compartment (FFICC) of a truck-mounted howitzer during the artillery firing. This overpressure is the primary factor preventing personnel from firing artillery within the cab. To investigate the overpressure characteristics of the FFICC, a foreign trade equipment model was used as the research object, and a numerical model was established to analyze the propagation of muzzle blast from the muzzle to the interior of the crew compartment under extreme firing condition. For comparative verification, the muzzle blast experiment included overpressure data from both the flow field outside the crew compartment (FFOCC) and the FFICC, as well as the acceleration data of the crew compartment structure (Str-CC). The research findings demonstrate that the overpressure–time curves of the FFICC exhibit multi-peak characteristics, while the pressure wave shows no significant discontinuity. The enclosed nature of the cab hinders the dissipation of pressure wave energy within the FFICC, leading to sustained high-amplitude overpressure. The frame-skin structure helps attenuate the impact of muzzle blast on the FFICC. Conversely, local high overpressure caused by the convex or concave features of the cab's exterior significantly amplifies the overpressure amplitude within the FFICC.

Electrothermal-chemical (ETC) launch technology can accurately control and enhance the ignition and combustion of solid propellants to improve the consistency and accuracy of ballistics. In this paper, a calculation model including the transient burning rate formula and six-degree-of-freedom rigid body trajectory equation is established to simulate both interior and exterior ballistics processes for a 155mm uni-modular charge howitzer. The simulation results show that the muzzle velocities are optimized via the ETC technology. The 155mm uni-modular charge ETC howitzer can effectively obtain the minimum range, increase the range overlap and maximum range, and improve the ballistic stability and consistency.