Practical Estimation of the Maturity of Water Melon

西瓜成熟度的实用估算

基本信息

批准号：
60860027
负责人：
NISHIMURA Isao
金额：
$ 4.22万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60860027/
关键词：
Maturity of water Physical property of water melon Hitting sound and delivered accerelation NOtch filter method Power spectral density 論理演算農産物の物性打撃振動波形農産物生長と熟度

项目摘要

This research has carried about five years in our labaratory under the standpoint that the optimum harvesting time depends upon the matyrity of water melon. Two kinds of mearsing apparatus for estimating the optimum harvesting time are developed.1 Filter method : This appratus is composed with microphon ,notch filter to make the frequency and LED level meter to indicate the sound signal. When the frequency of the sound agrees with the frequency of the notch filter, the output level between just after filter and just before filter is pallel with maturity of the water melon. Previous research have dissolved the relation between the frequency and maturity of the water melon.2 Computer aided method : From the frequency data of the hitting sounds and delivered accerelation through the water melon and the physical data of the water melon, the maturity of the water melon is estimated. This proccesor is composed to microphon and its amplyfier to catch the hitting sound of the water melon,A-D comvertor to make sound data to digital data,16-bit one board computer system that analyses the data,calculates the power spectral density and calculates and estimates the maturity, is carried and LED idicator system indicates the estimating results. After the data of sound being A-D converted,the data is analysed to get the values of attack time,sustain time, release time and symmetry of the frequency. The power spectral density is calculated from the method of FFT and then evaluated and estimated the maturity of the water melon.

这项研究在我们的纳法术中大约五年了，即最佳收获时间取决于水瓜的成长性。开发了两种用于估计最佳收获时间的摩尔式设备。1滤波器方法：此批准与麦克风，Notch滤波器组成，以制定频率和LED电平计，以指示声音信号。当声音的频率与Notch滤波器的频率一致时，过滤器和过滤器之前的输出水平与水瓜的成熟在一起。先前的研究已经溶解了水瓜的频率和成熟度之间的关系。2计算机辅助方法：从撞击声音的频率数据中，通过水瓜和水瓜的物理数据进行加速，估计水瓜的成熟度。该opcesor组成麦克风及其更大的捕获水瓜的声音，A-d comvertor，以将声音数据传达到数字数据，16位的一板计算机系统，该计算机系统分析数据，计算功率频谱密度并计算并估算成熟度，并携带和LED IDIDICATIC系统表示估计结果。在将声音的数据转换后，分析数据以获取攻击时间，维持时间，释放时间和对称频率的值。功率谱密度是根据FFT方法计算的，然后评估并估计水瓜的成熟度。