Dynamic Weighing Method with Time-variant IIR Low-pass Filter

Sanayide üretimden sevkiyat aşamasına kadar birçok alanda kullanılan otomatik ağırlık kontrol sistemi, üç adet konveyör bant, en az iki adet fotosel, yük hücresi, işlemci, kullanıcı için kontrol ekranı ve reddedici/yönlendirici kollarından oluşmaktadır. Ağırlık ölçerken, yük hücresi tarafından alınan ölçüm sinyalinin filtrelenmesi aşamasında literatürde kaskat yapıda zamanla değişen alçak geçiren filtrenin önemli bir yeri olduğu gözlemlenmiş ancak sonuca ulaşma konusunda oldukça fazla filtre adedinin mevcut olduğu gözlemlenmiştir. Sonuçlara ulaşma aşamasının hızlandırılması amacıyla bu çalışmada zamanla değişen alçak geçiren filtre ile farklı bir yaklaşım denenmiştir. Sonuca daha hızlı ulaşabilmek için kaskat bağlı alçak geçiren filtre adedi önem arz etmektedir. Filtre adım adım uygulanarak oluşan salınımlardan ürünün ağırlığına minimum filtre adedi ile ulaşmak hedeflenmiştir. Matlab'ta yapılan deneyler sonucunda çok yüksek hızlarda bu işlemle yönetmelikte belirtilen hata limitleri içerisinde sonuçların elde edilemediği görülmüş olup hata limitleri içerisinde elde edilen maksimum hız belirtilmiştir. Sonuç olarak filtre adedi azaltılıp, sönümleme hızlandırılarak oluşan salınımlardan ağırlık verisine yönetmelikte verilen hata sınırları içerisinde ulaşılmıştır.The automatic weight control system, in other words checkweigher is used in many areas from production to shipment in the industry, consists of three conveyor belts, at least two photocells, load cell, processor, control screen for the user and rejector/router arms. It has been observed in the literature that the time-varying low-pass filter in the cascade structure plays an important role in the filtering of the measurement signal received by the load cell while reaching the product mass, but it has been observed that quite a lot of filters are used to reach the result. In this study, a different approach was tried with a time-variant low-pass filter in order to accelerate of reaching the results. The number of cascade form low-pass filter used in filtering is important to get the accurate weight. By applying the filter step by step, it is aimed to reach the mass of the products from the oscillations with minimum number of filters. As a result of the experiments carried out in MATLAB, it was observed that the results could not be obtained within the error limits specified in the regulation with this process at very high speeds. The maximum speed obtained within the error limits was specified. As a result, by reducing the number of filters and increasing the damping, the mass of product from the oscillations were reached faster within the error limits given in the regulation

Dynamic Weight Estimation of Non-Singulated Objects

Weight estimation is a common practice throughout many industries, though it typically requires that the objects to be weighed remain motionless. More often than not, it is beneficial to allow objects to move freely through a process, so that time is not lost in stopping and rerouting the object to a weight sensor. This is the basis for achieving dynamic weighing, where the object to be measured continues to have motion relative to the weighing sensor. Typically, this has been achieved with signal processing techniques that produce favourable results with singular objects. The challenge is when multiple objects are grouped and moving together; that is, they are non-singulated and cannot be weighed separately. This work reports the development of an In-Motion Weight Sensor array, which is a new dynamic weighing system with a new real-time signal processing method for estimating the weight of multiple, non-singulated objects. The array system employs a recursive least squares estimation algorithm to combine weight sensor data and the locations of boxes that are travelling through the array to attribute fractions of a box’s load to the appropriate individual sensors. To demonstrate the performance of the proposed system, a full-scale experimental setup has been built and tested. Through statistical analysis of the weight estimates of a variety of groups of objects, it is shown that the system can produce results within 10% measurement error for the majority of non-singulated cases. It is most effective for non-rigid boxes that also fall within the mid-range for package size and weight, around 0.05m² and 1-3kg, respectively. Changes to the mechanical design can vastly improve performance accuracy and precision, and recommendations for these alterations are given in the conclusion

Aeronautical engineering: A continuing bibliography with indexes (supplement 253)

This bibliography lists 637 reports, articles, and other documents introduced into the NASA scientific and technical information system in May, 1990. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Commonwealth of Independent States aerospace science and technology, 1992: A bibliography with indexes

This bibliography contains 1237 annotated references to reports and journal articles of Commonwealth of Independent States (CIS) intellectual origin entered into the NASA Scientific and Technical Information System during 1992. Representative subject areas include the following: aeronautics, astronautics, chemistry and materials, engineering, geosciences, life sciences, mathematical and computer sciences, physics, social sciences, and space sciences

Aeronautical engineering: A continuing bibliography with indexes (supplement 252)

This bibliography lists 425 reports, articles, and other documents introduced into the NASA scientific and technical information system in April 1990. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Aeronautical engineering: A continuing bibliography with indexes (supplement 275)

This bibliography lists 379 reports, articles, and other documents introduced into the NASA scientific and technical information system in Jan. 1991

Aeronautical Engineering: A continuing bibliography (supplement 138)

This bibliography lists 366 reports, articles, and other documents introduced into the NASA scientific and technical information system in July 1981

Aeronautical engineering: A continuing bibliography with indexes (supplement 212)

This bibliography lists 493 reports, articles and other documents introduced into the NASA scientific and technical information system in March, 1987

Aeronautical engineering: A special bibliography with indexes, supplement 38, December 1973

This special bibliography lists 473 reports, articles, and other documents introduced into the NASA scientific and technical information system in November 1973

Aeronautical engineering: A cumulative index to a continuing bibliography (supplement 274)

This publication is a cumulative index to the abstracts contained in supplements 262 through 273 of Aeronautical Engineering: A Continuing Bibliography. The bibliographic series is compiled through the cooperative efforts of the American Institute of Aeronautics and Astronautics (AIAA) and the National Aeronautics and Space Administration (NASA). Seven indexes are included: subject, personal author, corporate source, foreign technology, contract number, report number, and accession number