According to the heat equilibrium of indoor room air and one of the surface of interior protective structures, load change can be dynamically analyzed.
根据室内空气热平衡和围护结构内表面的热平衡，可以对负荷变化进行动态分析。
Air spring is characteristic of variable stiffness, its natural vibration frequency is much lower than that of leaf spring and will not change with load of vehicle.
空气弹簧具有变刚度特性，其固有振动频率要比钢板弹簧低得多，且不随汽车承载质量的变化而改变。
With the change of environment and indoor heat load, the refrigeration and air-conditioning system almost operate at varying condition.
随着环境和室内热负荷的变化，制冷空调系统通常是在变工况条件下运行。
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