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Based on the finite element analysis software ABAQUS, the rotary fatigue life of the aluminum ahoy wheel is simulated. The initiation point of the fatigue crack and its maximum stress are obtained.

该文运用有限元分析软件ABAQUS，对某铝合金车轮旋转弯曲疲劳寿命进行了仿真分析，得出易于产生疲劳裂纹的应力集中点及其最大应力值。

To minimize the cost function, the optimal set-points of AHU supply air temperature, supply chilled water temperature and outdoor air ventilation rate can be obtained.

在系统层次上的优化控制方案中，本文利用自适应参数辨识技术建立了可以对变风量空调系统实施在线仿真的系统模型，同时，将基因遗传算法用作优化计算方法。

In this article,the authors analyze the aiguille voltage of the whole-bridge DC source converter circuit according to the mathematics model when the MOSFET transistor is shut and the instant voltage equations are obtained.

对直流电源变换器的常用电路型式进行了具体工作过程分析；根据所建立的数学模型，分析MOS管关断瞬间的尖峰电压，得出其瞬间电压方程，并应用PSPICE软件的仿真结果对其进行验

For improving the air quality, the concepts of age of air are introduced and the solutions of age of air and ventilation efficiency are obtained by using tracer gas concentration of typical points of the cabin.

为了提高客舱内空气品质，引入了空气龄的概念并给出了由客舱内典型点的示踪气体的浓度求空气龄及通风效率的方法。

In addition, the ventilation e2ciency, local mean age of air and other characteristic parameters were experimentally and numerically obtained for a mock-up classroom ventilated with the two systems.

另外，通风e2ciency，当地平均年龄航空等特性参数进行了实验，并取得了数值模拟出教室通风与两种制度。

Numerical simulation for air cooling vertical falling film absorption of LiBr solution;2. The results obtained will be helpful for the development of air cooling absorber.

该文提出了风冷吸收器的设计方案，建立了风冷吸收器降膜吸收过程中传热、传质耦合问题的物理数学模型。

Experiment demonstrates that the turbulence intensity variation information within a short-range air gap can be obtained.

实验验证了利用该光路可在很短的空气间隙内获得湍流强度的变化信息。

By analysis of enforcement of drilling tools of air downhole hammer 's following pipe, the factors affecting the drilling speed and depth of the following pipe are obtained.

通过对空气潜孔锤跟管钻进钻具的受力分析，得到影响潜孔锤跟管钻进速度和跟管深度的因素。

Based on the analysis of the forces exerted on particles in air flow, the track equation which describe particles jetted from nozzle in air sampler and formula between the track and design parameters of impactor are obtained.

本文从颗粒在气流中的受力情况分析入手，得到冲击采样器中喷嘴喷出后颗粒的运动轨迹方程以及运动轨迹与采样器切割头设计参数的关系式。

I SP* is the vacuum impulse that would be obtained by a sonic nozzle in air-breathing motor work, and thus may be ignored.

i 特*是真空的冲动将得到一音速喷嘴在吸气式发动机的工作，从而可能会被忽略。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。