If the diesel engine has a superior economic performance, a dependable work, and if the noise and the vibration can be controlled in a lower limit, which usually depends upon its valve train system.
一台柴油机的经济性能是否优越，工作是否可靠，噪音与振动能否控制在较低的限度，常常与其配气机构的设计是否合理有密切关系。
The assemble criterion of sensor for design was advanced. At last, a method of increasing signal-to-noise ratio and reducing flux lower limit value of vortex flowmeter was advanced.
椐此提出通过双钝体诱发卡门涡街增强涡街强度、提高涡街流量计的信噪比，进而降低涡街流量计的流量下限的方法。
This is a time-domain signal processing method which has a lower signal to noise ratio limit. Therefore, it will have very good future in applications.
此方法是目前信噪比门限较低的时域信号处理方法，因而具有广泛的应用前景。
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