No abstract

To enhance the mobility of combat tracked vehicles, a high-powered compact power pack is crucial. To achieve this goal, it is planned to apply the concept of high-contact-ratio (HCR) gearing to an independent final-drive planetary gear assembly of the tracked vehicle transmission. Before applying the concept to the final-drive, the performances of both normal-contact-ratio (NCR) and HCR conventional parallel shaft spur gearing systems are evaluated and compared. The results show that, for the same torque, HCR gears are subjected to lower loads and endure almost double the life of NCR gears. This reveals that an HCR gear can transmit more power for the same size. Furthermore, the power loss, vibration, and noise level of the HCR gearing are significantly lower than those of the NCR gearing. The proven results of the case study have encouraged the replacement of the existing NCR gearing with the HCR gearing for the final-drive planetary assembly of the combat tracked vehicle for evaluation.

No abstract

A simulation process evolved for evaluating the performance of HF-VHF multi-radio set configuration in a tactical command vehicle is discussed. Algorithms and performance models used in the simulation process are briefly described. Simulation process is for a specific application in a defined area of deployment under known operating situations. Performance simulation also includes an interference simulation model corresponding to the system model so that a real world situation is analysed to the practicable extent. Wherever statistical data or manufacturer's design data is not available, suitable default values are assumed for applicable, battlefield scenario quoted in the literature. This simulation tool can be extended to many applications (with modification to RF power of transmitters, receiver sensitivity, frequency separation, distance separation, channel spacing, frequency range, communication range, etc. of tactical vehicles operating in combinations of HF-VHF-UHF regions).