【摘要】：作為一種重要的計(jì)量設(shè)備,稱重系統(tǒng)在工業(yè)、農(nóng)業(yè)、醫(yī)療、交通等眾多領(lǐng)域得到廣泛應(yīng)用。同時(shí),隨著智能測(cè)控與無線通信技術(shù)的快速發(fā)展,各領(lǐng)域?qū)ΨQ重系統(tǒng)的可靠性、精確度,以及無線傳輸、智能化等功能也有了更高的需求。本文提出了一種新型無線智能稱重系統(tǒng)的設(shè)計(jì)方案。該系統(tǒng)以微處理器為核心,由數(shù)據(jù)采集、模數(shù)轉(zhuǎn)換、存儲(chǔ)單元、無線發(fā)送與接收模塊、紅外模塊、控制模塊和顯示模塊組成。無線發(fā)送與接收模塊能在短距離內(nèi)代替有線電纜的連接,實(shí)現(xiàn)稱重?cái)?shù)據(jù)的無線傳輸與監(jiān)控功能。通過將紅外遙控、控制鍵盤與軟件編程相結(jié)合,完善了稱重系統(tǒng)的信息處理、自主校準(zhǔn)、參數(shù)設(shè)置與數(shù)據(jù)存儲(chǔ)等功能。另外,針對(duì)系統(tǒng)掉電測(cè)量數(shù)據(jù)丟失問題,提出了一種具有數(shù)據(jù)保護(hù)功能的電源開關(guān)機(jī)電路,并有效地降低了稱重系統(tǒng)的功耗。針對(duì)稱重傳感器采集數(shù)據(jù)過程中干擾信號(hào)對(duì)電子稱重系統(tǒng)測(cè)量精度的影響,將限幅濾波法、中位值濾波法、滑動(dòng)平均濾波法相結(jié)合,提出了既可消除采集數(shù)據(jù)中偶然性脈沖,又可抑制周期性干擾的改進(jìn)型限幅平均濾波算法,結(jié)合非線性補(bǔ)償,有效的提高了稱重系統(tǒng)的測(cè)量精度。通過5kg~50 kg重量范圍內(nèi)8組不同目標(biāo)重量的測(cè)量實(shí)驗(yàn),對(duì)系統(tǒng)的功能、精確度,以及靈敏度、重復(fù)性與遲滯性等指標(biāo)進(jìn)行了分析與測(cè)定。實(shí)驗(yàn)結(jié)果表明,系統(tǒng)能夠?qū)崿F(xiàn)信息采集、自主校準(zhǔn)、參數(shù)設(shè)置與數(shù)據(jù)存儲(chǔ)等所有設(shè)定的功能,最大測(cè)量誤差率為0.1%,具有很高的精確度與穩(wěn)定性;實(shí)驗(yàn)測(cè)定該系統(tǒng)的靈敏度約為0.1mV/kg,重復(fù)性誤差為0.32%,最大遲滯引用誤差為0.16%,具有良好的輸入/輸出特性。此外,無線傳輸距離在無障礙范圍內(nèi)達(dá)到二百米,性能達(dá)到了設(shè)計(jì)要求。通過將使用與未使用改進(jìn)型限幅平均濾波算法的無線智能稱重系統(tǒng)進(jìn)行對(duì)比測(cè)試和分析,結(jié)果表明,使用改進(jìn)型限幅平均濾波法后系統(tǒng)的最大誤差率由0.9%降至0.1%,比未使用該算法的系統(tǒng)精度提高了9倍,有效的抑制了干擾信號(hào),提高了系統(tǒng)精度。
[Abstract]:As an important metering equipment, weighing system has been widely used in industry, agriculture, medical treatment, transportation and many other fields. At the same time, with the rapid development of intelligent measurement and control and wireless communication technology, the reliability, accuracy, wireless transmission, intelligent and other functions of symmetric heavy system in various fields also have higher requirements. In this paper, a new design scheme of wireless intelligent weighing system is proposed. The system is based on microprocessor and consists of data acquisition, analog-to-digital conversion, memory unit, wireless sending and receiving module, infrared module, control module and display module. The wireless transmission and receiving module can replace the cable connection in a short distance to realize the wireless transmission and monitoring of weighing data. By combining infrared remote control, control keyboard and software programming, the functions of weighing system, such as information processing, independent calibration, parameter setting and data storage, are improved. In addition, a power switch circuit with data protection function is proposed to solve the problem of power loss measurement data loss in the system, and the power consumption of the weighing system is effectively reduced. In view of the influence of interference signal on the measurement accuracy of electronic weighing system in the process of data acquisition by weighing sensor, the limiting filtering method, the median filtering method and the moving average filtering method are combined to eliminate the accidental pulse in the collected data. The improved limiting average filtering algorithm, which can suppress periodic interference, combined with nonlinear compensation, effectively improves the measurement accuracy of weighing system. Through the measurement experiments of eight groups of different target weights in the weight range of 5kg~50 kg, the function, accuracy, sensitivity, repeatability and lag of the system were analyzed and measured. The experimental results show that the system can realize all the functions of information collection, independent calibration, parameter setting and data storage, and the maximum measurement error rate is 0.1%, which has high accuracy and stability. The sensitivity of the system is about 0.1 MV 鈮，

本文編號(hào)：2485252