温室设施环境中声频自适应校准研究

针对温室设施环境中采用声波促长技术时,由于环境设施对声音的来回反射、设施材料对不同声频的吸收作用等影响,使得实际声波信息失真,造成加载的声波与期望的声波相差较大,提出一种解决方案.通过及时修正声频发生系统传递函数特性参数,采用一种基于前馈补偿的闭环控制方法实现对设施环境中所加载声频的自适应校准.在一个内部长、宽、高分别为1.2m、0.53m、0.9m的人工气候箱内进行声波加载试验,结果表明,该方法提高了声波在设施环境中的加载精度,对纯音、组合声频、音乐声频等类型的声波均达到了良好的校准作用,输出精度都在98％以上.

Self-adaptive Calibration of Acoustic Waves in Controlled Greenhouse

Some kind of audible sound can help plants or animals to grow healthily and faster. However, the acoustic waves was hard to be produced accurately as they would be absorbed or reflected back and forth in controlled environments such as greenhouse, plant factory, or aquaculture factory. A solution for improving audible sound output based on a closed-loop feed-forward control method was proposed. The output sound can be corrected by updating the transfer function of sound generation system. Proof tests were conducted in an artificial climate cabinet with 1.2m×0.53m×0.9m. The results showed that pure tones, combination sound of pure tones, and normal music can be produced with over 98% output accuracy.