CAJ | 학술논문

针对传统活塞往复式气动发动机中连杆对曲柄的作用力及方向不断变化，以及连杆对活塞侧向力使活塞摩擦力增加的缺点，提出了一种新型二级膨胀往复式气动发动机总体结构。应用单向轴承和齿轮传动，设计了具有双行程驱动膨胀做功的传动结构和气动控制回路。通过研究进排气过程与动力参数的相互作用关系，建立了两级耦合膨胀系统动力学模型，在MATLAB\SIMULINK下进行了仿真研究。仿真结果表明，在该文提供的结构参数下，动力性能满足设计要求，充气行程比是影响性能的主要因素。当充气行程比超过0.8时，输出功率因排气损耗增加而不再提升，在满足负载条件下，减小充气行程比有利于提高能量利用率，可达约77%。
침대전통활새왕복식기동발동궤중련간대곡병적작용력급방향불단변화，이급련간대활새측향력사활새마찰력증가적결점，제출료일충신형이급팽창왕복식기동발동궤총체결구。응용단향축승화치륜전동，설계료구유쌍행정구동팽창주공적전동결구화기동공제회로。통과연구진배기과정여동력삼수적상호작용관계，건립료량급우합팽창계통동역학모형，재MATLAB\SIMULINK하진행료방진연구。방진결과표명，재해문제공적결구삼수하，동력성능만족설계요구，충기행정비시영향성능적주요인소。당충기행정비초과0.8시，수출공솔인배기손모증가이불재제승，재만족부재조건하，감소충기행정비유리우제고능량이용솔，가체약77%。
To overcome the defects of crank force changing constantly and piston friction adding because of the radial force on it in traditional crank-slider reciprocating pneumatic engine,a new type of two-stage expansion reciprocating pneumatic engine is proposed. A special transmission mechanism using unidirectional bearing and gear transmission, which can be bidirectionally driven by volume expansion,and the corresponding pneumatic circuits are designed. Through analyzing the relationship of intake and exhaust conditions and power performances,the two-level coupling expansion dynamic model is established and simulated with MATLAB\SIMULINK. The simulation results show that the performances of pneumatic engine can meet the design requirements and the charge ratio of stroke is a key factor. The output power doesn’t continually increase when it is over 0. 8 because of the fast piston velocity,the more exhaust loss. Therefore, the charge ratio of stroke should be controlled as low as under the condition of meeting the requirement of load. The energy efficiency can reach 77%.