4results about How to "Improve application quality" patented technology

This application relates to the field of alloy steel technology, specifically disclosing an ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor and its preparation method. The ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor is made from a chemical composition comprising the following weight percentages: C 0.15-0.25%, Si 0.2-0.5%, Mn 1.5-2.5%, Cr 0.5-1.25%, Ni 0.3-0.8%, Mo 0.2-0.5%, Al 0.02-0.06%, V 0.05-0.15%, Ti 0.02-0.08%, Nb 0.01-0.05%, P 0.01-0.02%, S 0.005-0.01%, with the balance being Fe. The ultra-high strength cast steel frame for the high-speed railway permanent magnet traction motor of this application achieves ultra-high strength while maintaining excellent plasticity and toughness and extremely high fatigue limit. This allows designers to use thinner and more optimized frame wall thickness while ensuring safety margin, thereby directly achieving the goal of lightweighting and enabling it to cope with the extreme vibration conditions of high-frequency and high-stress cycles of high-speed railway traction motors.

The invention belongs to the technical field of power electronic system control, and particularly relates to a bridge arm energy balance control method of a modular multi-level converter, which comprises the following steps: generating a direct current bus current reference value for representing the direct current side energy regulation requirement of the modular multi-level converter; in combination with the energy state of each bridge leg, generating a bridge leg current reference value corresponding to each bridge leg by using a bridge leg current reference value distribution strategy; generating mutually independent bridge leg common-mode voltage modulation signals of the bridge legs; based on a common-mode modulation signal energy rectification distribution strategy, performing energy rectification type distribution in the bridge legs, and generating common-mode voltage modulation signals corresponding to the upper bridge arm and the lower bridge arm; the differential mode voltage modulation signals are combined with differential mode voltage modulation signals generated by alternating current side control to generate bridge arm voltage modulation signals corresponding to the bridge arms; trigger pulses of all sub-modules in the bridge arm of the modular multilevel converter are generated through a modulation method, and controlled adjustment of the energy of the bridge arm is achieved.

The application relates to the technical field of ton bag lining materials, and particularly discloses a shielding and antistatic ton bag lining bag and a preparation method thereof. The shielding and antistatic ton bag lining bag is made of a multilayer composite film with a structure of PET / antistatic layer / PA / PE, and the antistatic layer is made of raw materials containing the following components in parts by weight: resin 40-75 parts; filler 20-40 parts; color master batch 5-10 parts; antistatic agent 1-3 parts; dispersant 2-5 parts; antioxidant 0.2-0.4 parts; polyimide nanofiber 4-6 parts; and modified carbon nanotube 1-3 parts. The modified carbon nanotube is prepared by the following method: S1, pretreating carbon nanotube raw materials with concentrated nitric acid solution to obtain pretreated carbon nanotubes; and S2, dispersing the pretreated carbon nanotubes in dimethylbenzene, adding deionized water and p-toluenesulfonic acid, then adding aniline monomer, and adding ammonium persulfate for reaction, and obtaining the product after the reaction is completed. The shielding and antistatic ton bag lining bag can maintain stable antistatic performance under the influence of an environment with a sharp change in temperature.

The application discloses a locomotive intelligent operation and maintenance system and method, a storage medium and electronic equipment, and relates to the field of locomotive operation and maintenance.The system comprises a data management platform, a whole vehicle function module and a plurality of business modules, all the modules are independently adapted and deployed in partitions and the running environments are mutually isolated, the data management platform collects and pre-processes multi-source data to obtain standardized data, the whole vehicle function module executes vehicle overall level operation and maintenance management business based on the whole vehicle standardized data distributed by the data management platform, and the business module executes fine operation and maintenance management of corresponding business based on the business standardized data distributed by the data management platform.The application independently deploys all the modules, isolates the running environments, completes independent splitting of the modules, supports parallel collaborative development of multiple professional teams, and shortens the development cycle.The modules do not directly communicate, compatibility problems and implicit faults caused by direct coupling between the modules are eliminated, and the application quality of the system is improved.