Relevant bibliographies by topics / Chopper

Academic literature on the topic 'Chopper'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 May 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Chopper.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Chopper"

1

Yang, Anming, Wei Xiang, Bo Yan, Yiping Duan, Jiangnan Lv, and Mingliang Wu. "Optimization and Test of Structural Parameters of Flat Hob Chopper." Agriculture 12, no. 6 (June 8, 2022): 824. http://dx.doi.org/10.3390/agriculture12060824.

Full text
Abstract:
In order to reduce the chopping power consumption of a flat hob chopper (referred to herein as chopper) on the premise of ensuring the chopping effect of the chopper, the mathematical model of optimal design of chopper is established in this paper with the minimum chopping power as the objective. With the help of MATLAB software, the mathematical model is solved. The chopping power curves of each point on the chopper blade edge line before and after the optimization of structural parameters are generated. The results indicate that when the coordinate value of point A on the blade edge line on the Z axis is 0.7 m; the included angle between the bottom surface of the blade and the axis of the cutter roll is 6°. When the radius of the chopper is 0.11 m, the chopper can obtain the theoretical minimum chopping power. The analysis result of chopping power curve is the chopping power after structural parameter optimization is reduced by about 25.50% compared with that before optimization. The choppers before and after the optimization of structural parameters was trial manufactured and sequentially mounted on the performance test bench of the chopping system of the forage ramie harvester. The test results show the standard-length rate of ramie stalk chopped by the choppers before and after the optimization of structural parameters were 92.96% and 92.84%, respectively, which were extremely close to each other, indicating that the optimization of structural parameters has no influence on the chopping effect of the chopper. The chopping power of the chopper is reduced by 22.25% after optimization, which is close to the software analysis value (25.50%), indicating that the optimization result is accurate and reliable. This study can provide parameter foundation and an optimization method for lowering chopping power consumption of the chopper.
APA, Harvard, Vancouver, ISO, and other styles
2

Djumhariyanto, Dwi, Mahros Darsin, Hari Arbiantara Basuki, and Robertoes Koekoeh Koentjoro Wibowo. "Introduction to Chopper Machines as a Supporter of Increasing Production and Quality of Livestock Feed in Jember Jelbuk Village." PKM-P 7, no. 1 (May 29, 2023): 100. http://dx.doi.org/10.32832/jurma.v7i1.1775.

Full text
Abstract:
Silage is animal feed fermented to add nutrition and increase feed availability, especially during the dry season. The feed fermentation process is faster if the feed has been chopped before. This service aims to introduce choppers to Jelbuk Village, Jember Regency farmers. The service begins by discussing the problems faced by farmers/breeders, chaired by Mr. Mahfudz. They wanted a portable mini chopper to move and operate this machine at each member's residence. The chopper is modified from the previous multi-function chopper machine, which can chop leaves and twigs and crush animal manure for compost raw materials. Socialization of this machine is carried out simultaneously with training in making silage. After demonstrating the machine's operation and maintenance, the service partners were enthusiastic and rushed to try this new counter at their homes. They hope coaching activities can be continued later with the technologies they need.
APA, Harvard, Vancouver, ISO, and other styles
3

Yudhanto, Ferriawan, Putri Rachmawati, and Citravia Agustin. "Effect of Feeding Size of Cassava Leaf by Chopper Machine on Milk Production of Goat at Kemirikebo Village." E3S Web of Conferences 425 (2023): 04004. http://dx.doi.org/10.1051/e3sconf/202342504004.

Full text
Abstract:
A chopper machine that functions as a feeding chopper is often used in agriculture and animal husbandry. The design of this machine is different from a commercial chopper. It is used with a set length of chopped sizes variation in 4 sizes, 1, 3, 5, and 7 cm. Chopped sizes based on the farmer’s requirement to meet standard feeding sizes will impact livestock production. Smaller sizes of feeding, mainly forage (basal feeding) which is easier to digest, will increase feeding efficiency. This research aims to inform farmers about the importance of knowing the forage size for goats that will increase livestock productivity. The 3-5 cm chopped cassava leaf’s optimum size raises milk production from 700 to 1000 ml/day/goat (raising to 42%). This is because the size of the chopped forage makes it easier for the microbial in the goat’s rumen to be digested.
APA, Harvard, Vancouver, ISO, and other styles
4

Jia, Duanyang, Zhijun Wang, Zhenyu Xu, Weilong Chen, Yimeng Chu, and Chunguang Su. "Design of an E × B chopper based on permanent magnets." Journal of Physics: Conference Series 2687, no. 4 (January 1, 2024): 042002. http://dx.doi.org/10.1088/1742-6596/2687/4/042002.

Full text
Abstract:
Abstract Chopper systems are typically used to provide beam time structure and ensure the safety of accelerator operation by deflecting the beam away. The reliability of conventional choppers is entirely based on high-voltage (HV) pulsed power supplies. However, when the power supply fails to charge the electrostatic deflection plate, the beam cannot be cut off, and it will enter the downstream accelerator. To meet the strict beam stopping time requirements of the China Initiative Accelerator Driven System (CiADS), novel E × B chopper design has been developed based on a permanent magnet and an electrostatic deflection plate. This design not only ensures the safety of the accelerator but also provides the necessary pulse waveform. The device is small, highly reliable, and suitable for most accelerators. Moreover, beam dynamics simulations have been conducted to evaluate the chopper’s influence on beam quality, and its beam cutting capability has been analyzed.
APA, Harvard, Vancouver, ISO, and other styles
5

Warji, Warji, and Tamrin Tamrin. "Aplikasi Pencacah Pakan Ternak pada Peternak Kambing Isbani Farm." Jurnal Pengabdian Fakultas Pertanian Universitas Lampung 1, no. 2 (September 21, 2022): 435. http://dx.doi.org/10.23960/jpfp.v1i2.6238.

Full text
Abstract:
The feed given to goats is generally in the form of grass and cocoa pods. The grass that is given directly without being chopped is not eaten as a whole by the goat, but what is chopped first is eaten until it runs out. This service program aims to apply a forage chopper machine for goats at Isbani Farm so that the forage becomes fine in size. The method for reducing or smoothing the size of forage is to use a chopper in the chopping process. This chopper is in the form of two blades mounted on the axle and driven by diesel so that it can rotate and chop forage material. Service activities include problem formulation with partners, preparation of chopper machines, training on the use of chopping machines for partners and program evaluation. Partners are very open in conveying problems and very cooperative in coordinating. The animal feed material chopper machine can be well prepared; covering frame; the chopper and the driving motor. The training and application of the counting machine to partners went well; partners can absorb the knowledge and skills provided by the community service team. Evaluation of the service program went well; partners' knowledge increased by about 45%. It is necessary to conduct training in making silage or durable feed from agricultural waste feed ingredients such as corn stalks, rice straw and cassava leaves. It is necessary to create a sustainable program so that the partner assistance process is sustainable.
APA, Harvard, Vancouver, ISO, and other styles
6

Prananda, Fijay, Ridway Balaka, and Nanang Endriatno. "Analisis Perancangan Alat Pencacah Nilam Untuk Petani Nilam." Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin 9, no. 1 (March 2, 2024): 13. http://dx.doi.org/10.55679/enthalpy.v9i1.46935.

Full text
Abstract:
The automatic pull shaft on the patchouli chopper is an important component of the patchouli chopper machine. The research aims to carry out an analysis of the patchouli chopper pull shaft and produce a design for the newest patchouli chopper. In this research, the focus was only on the analysis of the pulling shaft on the patchouli chopper where all research methodologies were carried out using inventor software. The main driving engine is a combustion engine with a power of 5.5 HP, S45C shaft material with a tensile strength of 58 kg/mm2, and a shaft diameter of 15 mm. In the selection of pulleys, plays with diameters of 50 mm and 300 mm are used, V - Belt speed is 0.18 m/s, circumference length is 1499 mm, using V - Belt type B with axle distance of 474.6 mm, the contact angle is 2.3 rad and the length of the chopped patchouli was 3.8 cm. From the calculations and analysis, the addition of a pulling shaft to the patchouli chopper is safe to use. Keywords: Patchouli chopping tool, Puller shaft, Patchouli
APA, Harvard, Vancouver, ISO, and other styles
7

Grenci, N., D. Cortes, and M. Flaska. "Design of an epithermal neutron velocity selection system for the Penn State Breazeale Reactor." Journal of Instrumentation 18, no. 06 (June 1, 2023): P06035. http://dx.doi.org/10.1088/1748-0221/18/06/p06035.

Full text
Abstract:
Abstract A series of mechanical neutron choppers to operate as a velocity selection system have been developed for the Pennsylvania State Breazeal Reactor (PSBR). This chopper system will provide pulsed epithermal neutrons in the energy range of 0.5–40 eV with 2% or better energy resolution, and with a transmission of 1E-6 or better. Four different chopper geometries have been evaluated for their utility as mechanical neutron choppers. Specifically, Fermi, ring, piston, and disc choppers have been evaluated to assess their potential neutronics performance and mechanical constructability. A series of high-speed disc choppers were selected for the final design, and optimization work was performed to maximize the neutron pulse intensity. It is estimated that the optimized system will produce an epithermal neutron intensity of approximately 96 n/s. This system can also be operated in a time of flight (TOF) configuration such that the neutrons arriving at the source have a white spectrum. This operation can be accomplished by leaving the second stage of choppers in the open position, or by removing it from the beam completely. Such unique source of epithermal neutrons produced by this chopper system will have applications in both prompt and delayed epithermal neutron activation analysis (ENAA), as well as in neutron resonance transmission analysis (NRTA).
APA, Harvard, Vancouver, ISO, and other styles
8

Viorel, Alina Cristina, and Gabriela Crăciunaș. "Different Chopper Types for Supply Separately Excited DC Motor." International Journal of Advanced Statistics and IT&C for Economics and Life Sciences 13, no. 1 (December 1, 2023): 23–27. http://dx.doi.org/10.2478/ijasitels-2023-0003.

Full text
Abstract:
Abstract Nowadays saving the planet’s resources plays a very important role in improving our life conditions. The purpose of the paper is to supply the separately excited dc motor by using different chopper circuits. A very sustainable solution is to replace the resistors from classic theory with dc choppers for better efficiency. The armature voltage can be controlled by using IGBT chopper and the PWM signal received from controller is done with a dedicated block created by MATLAB environment. The advantages of developing this technique are that the speed changes proportionally with armature voltage and inversely with field voltage by keeping field and armature voltage constant respectively. The chopper designed with IGBT and Diode modules offers good control at any frequency value and the speed, the armature current and electromagnetic torque of DC motor can be control. In this paper, different choppers had been simulating were working in four quadrants for supply an excited dc motor by using Matlab program.
APA, Harvard, Vancouver, ISO, and other styles
9

Zhang, ZhiQiang, Allen David McHugh, HongWen Li, ShaoChun Ma, QingJie Wang, Jin He, and Kan Zheng. "Global Overview of Research and Development of Crop Residue Management Machinery." Applied Engineering in Agriculture 33, no. 3 (2017): 329–44. http://dx.doi.org/10.13031/aea.12167.

Full text
Abstract:
Abstract. Crop residue retention has been recognized worldwide to improve soil structure and fertility, reduce pollution and erosion, and enhance soil water retention/conservation. However, some factors limit the widespread adoption of on-farm machinery that can appropriately manage in-field residue. Two key factors are the quality of residue chopping and spreading uniformity. This article initially summarized the research on blade design, blade arrangement and power consumption. The article classified residue management machinery into three types: single function, multiple function and harvester powered straw chopper/spreader. Single function straw chopper/spreader was further subdivided into four types, according to installation and movement modes of the chopping blade; multiple function straw chopper/spreader was subdivided into six types, according to function and location; harvester powered straw chopper/spreader was subdivided into three types, according to mounting position. To improve the chopped straw spreading uniformity, adding a blower fan and improving blade roller structure were proposed to increase the air velocity. Finally, the article proposed future directions for straw chopper/spreader development, including awareness raising of straw chopping and spreading mechanism, analysis of flow characteristics in the machine, development of straw chopping and spreading regulating device. Keywords: Chopping quality, Crop straw, Spreading uniformity, Straw chopper/spreader.
APA, Harvard, Vancouver, ISO, and other styles
10

C. Bagaihing, Ery, Daud Pulo Mangesa, and Jefri S. Bale. "Feasibility Study of Production of Double Blade Grass Cutting Machine." International Journal of Business, Technology and Organizational Behavior (IJBTOB) 2, no. 3 (June 24, 2022): 183–94. http://dx.doi.org/10.52218/ijbtob.v2i3.191.

Full text
Abstract:
Most breeders generally feed their livestock only with grass, but for the grass itself it will be food that is easily found and is mostly given to livestock. However, most people still use machetes or sickles to cultivate grass, therefore SMEs have emerged in dealing with grass processing. The tool made is a grass chopper machine, the machine that was created also has several variations, one of which is a double knife chopper machine made by one of the students of the Nusa Cendana University Kupang, namely Stenly Naitboho. Therefore, this research was conducted to assess the performance of the chopper machine based on a feasibility study, in terms of the percentage length of the chopped material and the consumption of fuel used along with the production costs of this tool. In completing this research, several methods are needed to launch it, namely literature study and observation. After using the method used, the results of the chopping can be found, namely the percentage of the length of the chopped material measuring < 5 cm (W1) obtained an average of 54.62%, while the average percentage of the length of the chopped material measuring > 5 cm (W2) is 45.28%. For the size of the good chopped results is 2-5 cm in accordance with SNI 7785.1:2003 concerning the requirements for the results of the forage chopping machine. Another result in this study is the consumption of fuel used during the census obtained an average of 0.6 /hour. Based on SNI 7580:2013 the requirements for chopper work for fuel consumption of this machine are in category A. Production costs are obtained at a price of Rp. 4,122,200/ unit. Keywords:Consumption, Fuel, Shredded, Production
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Chopper"

1

Carrión, O. Paola, E. Edith Ibacache, R. Rafael Guillier, R. Rodrigo Cariceo, and Juan José Kwasigroch. "Club Chopper." Tesis, Universidad de Chile, 2008. http://www.repositorio.uchile.cl/handle/2250/111575.

Full text
Abstract:
Tesis para optar al grado de Magíster en Administración
No disponible a texto completo
Club Chopper nace de la experiencia de vivir el mundo de las motocicletas Harley Davidson y de la observación de las conductas y actividades predominantes en los fanáticos de esta actividad. Efectivamente, al conocer a fondo este particular y específico mundo, se detectó la necesidad de contar con un lugar físico único, característico, que fuera capaz de acoger al mundo de las motocicletas de alta cilindrada de Santiago, ofreciéndole un conjunto de productos y servicios de una manera tal, que de inmediato los miembros de este grupo se hicieran parte de este concepto y lo adoptaran como su lugar, propio, personal, a su medida y deseo. Lo anterior sumado a la expansión del mercado de las motocicletas, donde se ha incrementado tres veces en volumen, entre 2005 y 2006, y con un aumento relevante para 2007 en la marca Harley Davidson, genera las condiciones óptimas para el desarrollo de este proyecto. La característica predominante de este mercado es la pertenencia, ser parte del mundo Harley. Éste además, es un referente y una aspiración para la mayor parte de los poseedores de motocicletas de otras marcas, siempre en el segmento “custom”, “chopper” o “bobber”. Esto lleva a detectar la necesidad de crear un lugar donde los “Harlistas” y otros motociclistas puedan reunirse frecuentemente, a diario muchos de ellos y donde además puedan satisfacer todas sus necesidades al respecto, desde la adquisición de una motocicleta nueva o usada, hasta la obtención de servicios para sus motocicletas, vestimenta, accesorios, repuestos y encuentro con amigos. Con lo anterior, ‘Club Chopper’ es un conglomerado comercial que consta de tres áreas básicas: a) Tienda de motos, vestimenta, accesorios y repuestos de la marca Harley Davidson, más venta y consignación de motocicletas usadas. b) Taller de mantención, servicios y transformaciones de motocicletas. c) Un pub – restaurant temático. Las tres áreas configuradas en una conformación física tal que se genere un espacio cálido, específico y único donde se pueda practicar y disfrutar de este “estilo de vida”. El negocio base es la venta de motocicletas marca Harley Davidson, para lo cual, en un inicio, se importarán las unidades desde un dealer de Estados Unidos, para, posteriormente, trabajar en la obtención de un contrato con Harley Davidson para transformarnos en dealer autorizado e importar las unidades directamente desde la matriz. Asimismo, los demás productos para la venta (vestimenta, accesorios y repuestos) también seguirán este modelo de desarrollo. El taller se desarrollará sobre la base de uno de los actuales talleres no oficiales de la marca en Chile, el cual es propiedad de uno de los personajes líderes en este ambiente y quien se incorporará a Club Chopper, aportando su conocimiento técnico, experiencia, cartera de clientes y su imagen, característica altamente relevante para el éxito del proyecto. Finalmente, se creará un pub restaurant, con ambientación ad-hoc, una carta sencilla y espacios adecuados para las reuniones periódicas de diferentes grupos de motociclistas. La particularidad es la unidad, la que dará sinergia a las tres áreas, potenciará la actividad individual y generará la característica distintiva y única del proyecto. Club Chopper se ubicará en la comuna de Las Condes, en un local arrendado, el cual se deberá remodelar para albergar la configuración adecuada de las tres actividades. Hemos estimado la inversión inicial en un monto de MM$ 270, donde la mayor parte se dedica a la remodelación del local, más la importación de un stock de motocicletas y demás ítems tanto en artículos personales como repuestos y accesorios para las motos y la implementación del restaurant. Pese a las conservadoras proyecciones de ventas, el proyecto tiene la capacidad de recuperar la inversión inicial al cuarto trimestre del segundo año de operaciones. La competencia directa que enfrentará Club Chopper será la del actual distribuidor para Chile de la marca e indirectamente, los importadores de otras marcas de motos de este segmento como Yamaha, Honda y Suzuki. Estimamos que el distribuidor H-D, por lejos el líder en el segmento, como las demás marcas, no han explotado adecuadamente los conceptos subyacentes en este mercado, por lo que Club Chopper ingresará al mercado con claras ventajas competitivas y, dada la estructura de nicho, con un rápido posicionamiento como “el lugar propio de los Harlistas” y otros motociclistas, imagen que claramente será atractiva también para un público general.
APA, Harvard, Vancouver, ISO, and other styles
2

Hadiashar, Ali. "Chopper stabilization in analog multipliers." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35604.

Full text
Abstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.
Includes bibliographical references (p. 57-58).
The multiplier is a fundamental analog building block. Analog multipliers are used in many systems such as filters, neural networks, automatic gain control circuits, and phase alignment systems. As with any circuit, analog multipliers are plagued by DC offsets. When considering techniques for removing this offset, the question of continuous regulation versus calibration arises. We can easily implement a calibration method, however, how often one must calibrate becomes an issue. Additionally, calibration typically forces the multiplier to suspend normal operation while the offsets are being measured. In this thesis, a technique for continuously regulating offset in multipliers is studied in isolation. Chopper stabilization, a technique long used in DC amplifiers, is applied to analog multipliers to achieve the lowest offset reported.
by Ali Hadiashar.
S.M.
APA, Harvard, Vancouver, ISO, and other styles
3

Allen, Kirk D. "Practical implementation of the hard switched buck chopper." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA331788.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Murad, Thamir Faraj. "Digital control of chopper-fed DC motor drive." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/10836.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Chang, Kee Anselmo Marco Antonio. "Diseño de un amplificador chopper de señales neuronales." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8877.

Full text
Abstract:
En el presente trabajo de tesis se diseña un amplificador para ser utilizado como parte de un sistema de adquisición de señales neuronales. La topología elegida para el desarrollo fue la de cascodo plegado de una sola salida (single ended folded cascode), ubicando los moduladores chopper de manera que no haya limitación debido al ancho de banda. Debido a que este trabajo está enfocado a dispositivos implantables, se requiere de un bajo consumo de potencia, así como una pequeña área ocupada. A estos dos requerimientos se suma el de ruido, el cual es de gran importancia al ser esta la primera etapa del sistema. Se utilizó el software CADENCE para realizar distintas simulaciones que comprueban el correcto análisis realizado. Los resultados más importantes previo a la aplicación de la técnica chopper son: el ruido referido a la entrada de 2.92Vrms, con una potencia consumida de 36.78uW utilizando una fuente de alimentación de 3.3V, la ganancia de lazo abierto es de 102.1dB y la ganancia de lazo cerrado es de 45.88dB con un ancho de banda de 7.96kHz. El área ocupada por el circuito es de 0.0073mm2.
Tesis
APA, Harvard, Vancouver, ISO, and other styles
6

Godoy, Philip (Philip Andrew). "Nested chopper stabilization in analog multipliers and mixers." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44379.

Full text
Abstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.
Includes bibliographical references (p. 97-99).
We describe a general offset-cancelling architecture for analog multiplication using chopper stabilization. Chopping is used to modulate the offset away the output signal where it can be easily filtered out, providing continuous offset reduction which is insensitive to drift. Both square wave chopping and chopping with orthogonal spreading codes are tested and shown to reduce the offset down to the microvolt level. In addition, we apply the nested chopping technique to an analog multiplier which employs two levels of chopping to reduce the offset even further. We discuss the limits on the performance of the various chopping methods in detail, and present a detailed analysis of the residual offset due to charge injection spikes. An illustrative CMOS prototype of a chopper-stabilized general-purpose multiplier in a 0.18/pm process is presented which achieves a worst-case offset of 1.5/tV. This is the lowest measured offset reported in the DC analog multiplier literature by a margin of two orders of magnitude. The prototype multiplier is also tested with AC inputs as a squarer, variable gain amplifier, and direct-conversion mixer, demonstrating that chopper stabilization is effective for both DC and AC multiplication. The AC measurements show that chopping removes not only offset, but also 1/f noise and 2nd-order harmonic distortion. The specific application of chopper stabilization to RF direct-conversion mixers is also discussed in detail, showing how it can be used to improve the sensitivity of direct-conversion receivers by reducing the mixer's offset, 1/f noise, and even-order distortion. A prototype IC of a chopper-stabilized RF mixer in a 0.18pm CMOS process is presented, along with measured results.
by Philip Godoy.
S.M.
APA, Harvard, Vancouver, ISO, and other styles
7

Menolfi, Christian Ivo. "Low noise CMOS chopper instrumentation amplifiers for thermoelectric microsensors /." Zürich, 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13583.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cox, Graeme J. "A yield mapping system for sugar cane chopper harvesters." University of Southern Queensland, Faculty of Engineering and Surveying, 2002. http://eprints.usq.edu.au/archive/00004617/.

Full text
Abstract:
[Abstract]: Yield maps provide essential information for the spatial analysis and evaluation of crop production management at a within field level. Technology has been developed to conduct yield mapping in various crops including grain, potatoes and forage, but as yet no technology exists for yield mapping sugar cane. The chopper harvester is the most common form ofmechanical harvester for sugar cane. Therefore, the goal of this research is to develop a yield mapping system for the chopper type sugar cane harvester.After a review, it is proposed that a suitable accuracy goal for the sugar cane mass flow sensor would be ‘less than 5% cumulative measurement error, 95% of the time (2 standard deviations), measured over a 100m2 harvest area’.Existing mass flow sensors for other crops are reviewed.Based on this review four potential techniques are proposed to measure the mass flow rate of sugar cane. These were defined as the chopper power, elevator power and feed roller separation and weigh pad. These weretested simultaneously by placing various sensors on a single harvester and comparing the sensor outputs with the mass flow rate as measured by a weigh truck. In this trial, all techniques offered potential but none produced results close to the accuracy goal. A weighing technique, known as the ‘weigh pad’, offered the most potential for improvement and potential to accurately measure the mass flow rate with a single calibration under all conditions. The weigh pad technique suffered from very small load cell sensitivity to flow rate, drift in baseline readings and susceptibility to mechanical noise/acceleration dynamics.An opportunity arose to install a complete yield mapping system on a harvester within a commercial operation. This opportunity was accepted to assess the potential for applying yield maps to the agronomic management of sugar cane. Because the weigh pad sensor required further development at this stage, chopper and elevator power were used as a measure of mass flow rate. A full yield mapping system was developed. Yield mapping, directed soil sampling and variable rate gypsum application was conducted on a case study field. Economic analysis shows a clear economic benefit when compared with standardmanagement.Analysis is conducted on the weigh pad sensor examining its susceptibility to mechanical noise/acceleration dynamics. Theory is developed to mathematically model the effects of acceleration dynamics on the accuracy of weigh pad sensor. Laboratory bench testing supported the mathematical model. From the theoretical and experimental analysis a number of conclusions are drawn:· The weigh pad should be made as light as possible to minimise the error due todynamic conditions.· Electronic analogue filters should be used to reduce the noise due to externalacceleration.· The weigh pad should be as rigid as possible to maximise its natural frequency.A new weigh pad sensor was designed based on these conclusions. Field trials indicated the effects of external accelerations dynamics were significantly reduced. Baseline drift was then found as the next major factor limiting accuracy. The baseline drift was principally caused by the secondary extractor fan of the harvester inducing a negative pressure on the weighpad. A rubber curtain placed between the weigh pad and the secondary extractor fan reduced the negative force on the weigh pad due to the secondary extractor fan by 74% (from 17 N to 4.4 N). Therefore it is recommended the curtain be used to minimise the impact of the secondary extractor fan on the baseline drift of the weigh pad.A yield mapping system has been developed for the sugar cane chopper harvester incorporating the weigh pad sensor, a ground speed sensor, a DGPS receiver, a yielddisplay/monitor and data logger. Three identical systems have been constructed and installed on three harvesters for the 1998 cane harvest season. The results show sugar cane could be yield mapped using standard yield mapping principles.The level of accuracy being achieved by the yield mapping system is less than 16% error, with 95% confidence, over a measurement area of approximately 1400 m2. Although theaccuracy achieved is not to the desired research goal, yield maps were produced with satisfactory detail to make agronomic management decisions. The reliability of the sugar cane yield mapping system under field condition in a commercial operation was satisfactory. However, two techniques are proposed (“auto-zeroing” and “batch weighing” techniques) to improve the accuracy and reliability of the weigh pad readings during wet or adverseharvesting conditions.After note: At the time of writing the NCEA along with Case Austoft (CNH) were continuing to conduct research and development on the system and are intending to make theyield mapping system available as a standard item on new harvesters and a retrofit unit on existing harvesters in the near future (C. Barret, per. comm. 2001). The proposed “autozeroing” and “batch weighing” techniques are being tested.
APA, Harvard, Vancouver, ISO, and other styles
9

Sloboda, Alex R. "AC coupled ripple reduction method for chopper-stabilized amplifiers." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119772.

Full text
Abstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 44).
There exists a variety of applications where precision voltage amplifiers are required to faithfully sense and properly filter signals. While methods have been developed to create such precision amplifiers, these methods typically suffer from increased output noise. In the case of chopper amplifiers, this increased output noise comes in the form of narrow bandwidth, high frequency noise referred to as ripple noise. To reduce this ripple noise many topologies and techniques have been created and put into practice. However all of these topologies and techniques come at some cost in larger circuit area, higher power consumption, or increased noise. An AC coupled ripple reduction filter for chopper-stabilized precision amplifiers has been developed to reduce the cost of filtering out ripple noise. What follows is an explanation of ripple noise, an examination of existing ripple reduction methods, the presentation of the AC coupled ripple reduction filter, and simulated evidence of improved performance with this new method over existing methods in terms of smaller area, lower power consumption, and reduced noise.
by Alex R. Sloboda.
M. Eng.
APA, Harvard, Vancouver, ISO, and other styles
10

Said, Waleed M. "Microprocessor based speed control of a chopper-fed d.c. drive." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/14140.

Full text
Abstract:
The thesis is concerned with microprocessor-based control of a d.c. drive system using armature voltage control technique with a separately-excited, chopper-fed d.c. motor. The chopper circuit has a full-bridge configuration employing gate-turn-off (GTO) thyristors, and. is capable of four-quadrant operation, making the drive both reversible and regenerative. The control of motor speed is achieved by a completely digital technique, which does not require any analog-to-digital or digital-to-analog converters. A microcomputer, specially designed and built, generates the triggering signals for the GTO's by using the unipolar switching strategy, which is accomplished totally by software using look-up tables.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Chopper"

1

Chopper. London: Redemption House, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Branigan, Cat. Chopper pilot. New York: Warner Books, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Copyright Paperback Collection (Library of Congress), ed. Chopper ops. New York: Berkley Books, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Dominik, Andrew. Chopper: The screenplay. Sydney: Currency Press, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Hall, Douglas A. Chopper fundamentals 101. Clarkston, MI: Chopper Institute of America, LLC, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gàidhlig, Stòrlann Nàiseanta na, ed. Chopper: Nobhail ghoirid. Steòrnabhagh: Stòrlann/Acair, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Allard, Kent. The mad chopper. New York, N.Y: Kensington Pub., 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Zimberoff, Tom. Art of the chopper. New York: Bulfinch Press, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. Capacitively-Coupled Chopper Amplifiers. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-47391-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kandhipan, N. Chopper controlled dc motor. London: University of East London, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Chopper"

1

Gooch, Jan W. "Strand Chopper." In Encyclopedic Dictionary of Polymers, 704. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11265.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Melkebeek, Jan A. "DC Chopper." In Electrical Machines and Drives, 263–75. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Melkebeek, Jan A. "AC Chopper." In Electrical Machines and Drives, 277–85. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Weik, Martin H. "optical chopper." In Computer Science and Communications Dictionary, 1160. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_12945.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "Capacitively Coupled Chopper Amplifiers." In Capacitively-Coupled Chopper Amplifiers, 29–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "Introduction." In Capacitively-Coupled Chopper Amplifiers, 1–9. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "The Chopping Technique." In Capacitively-Coupled Chopper Amplifiers, 11–27. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "Choppers for High Input Common-Mode Voltages." In Capacitively-Coupled Chopper Amplifiers, 37–45. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "Capacitively-Coupled Chopper Operational Amplifiers." In Capacitively-Coupled Chopper Amplifiers, 47–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Fan, Qinwen, Kofi A. A. Makinwa, and Johan H. Huijsing. "Capacitively Coupled Chopper Instrumentation Amplifiers for High-Side Current Sensing." In Capacitively-Coupled Chopper Amplifiers, 71–92. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47391-8_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Chopper"

1

Ching, Michael T., Reid A. Brennen, and Richard M. White. "Microfabricated optical chopper." In SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, edited by Neal C. Gallagher, Jr. and Chandrasekhar Roychoudhuri. SPIE, 1993. http://dx.doi.org/10.1117/12.165705.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Enz, C. C., E. A. Vittoz, and F. Krummenacher. "A CMOS Chopper Amplifier." In Twelfth European Solid-State Circuits Conference. IEEE, 1986. http://dx.doi.org/10.1109/esscirc.1986.5468304.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Saethre, Robert, and Vladimir Peplov. "SNS LEBT Chopper improvements." In 2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC). IEEE, 2012. http://dx.doi.org/10.1109/ipmhvc.2012.6518842.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Geusa, Francesco, Andrea Agnes, and Franco Maloberti. "Use of chopper-notch modulator in chopper amplifiers for replica images cancellation." In 2008 15th IEEE International Conference on Electronics, Circuits and Systems - (ICECS 2008). IEEE, 2008. http://dx.doi.org/10.1109/icecs.2008.4674916.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bououd, Rahma, and Lassaad Sbita. "An overview of chopper topologies." In 2017 International Conference on Green Energy Conversion Systems (GECS). IEEE, 2017. http://dx.doi.org/10.1109/gecs.2017.8066207.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Kumngern, Montree. "A new chopper modulator circuit." In 2011 International Conference on Electronic Devices, Systems and Applications (ICEDSA). IEEE, 2011. http://dx.doi.org/10.1109/icedsa.2011.5959037.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hu, Xu, Jun Yuan, and Li Long. "Binary optics pyroelectric chopper technology." In Sixth International Symposium on Precision Engineering Measurements and Instrumentation. SPIE, 2010. http://dx.doi.org/10.1117/12.885670.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Rooijers, Thije, Shoubhik Karmakar, Yoshinori Kusuda, Johan H. Huijsing, and Kofi A. A. Makinwa. "31.4 A Chopper-Stabilized Amplifier with -107dB IMD and 28dB Suppression of Chopper-Induced IMD." In 2021 IEEE International Solid- State Circuits Conference (ISSCC). IEEE, 2021. http://dx.doi.org/10.1109/isscc42613.2021.9365790.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Volosyuk, V. K., V. V. Pavlikov, and S. S. Zhyla. "Statistical synthesis of chopper scanning radiometers." In 2013 IX International Conference on Antenna Theory and Techniques (ICATT). IEEE, 2013. http://dx.doi.org/10.1109/icatt.2013.6650758.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Fiori, Franco. "Susceptibility of chopper OpAmps to EMI." In 2015 IEEE International Symposium on Electromagnetic Compatibility - EMC 2015. IEEE, 2015. http://dx.doi.org/10.1109/isemc.2015.7256306.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Chopper"

1

Bradley, III, Joseph Thomas. H- Beam Chopper Overview. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1458919.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Weber, J. Chopper for Neutrinos and Antineutrinos. Fort Belvoir, VA: Defense Technical Information Center, October 1989. http://dx.doi.org/10.21236/ada218402.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Brennan M. J., L. Ahrens, and J. Alessi. AGS INJECTION STUDIES WITH THE FAST CHOPPER. Office of Scientific and Technical Information (OSTI), September 1989. http://dx.doi.org/10.2172/1151236.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jacobs, Stephen, and James E. Miller. Optoelectronic Workshops (14th). Ferroelectric Liquid Crystal IR chopper. Fort Belvoir, VA: Defense Technical Information Center, February 1989. http://dx.doi.org/10.21236/ada209035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lu, James, Piyush Sabharwall, Brenden Heidrich, and Rich Christensen. Advanced Manufacturing and Instrumentation for Neutron Chopper Design. Journal of Young Investigators, December 2020. http://dx.doi.org/10.22186/jyi.38.6.60-67.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Crawford, R. K. INEL5-single-crystal chopper spectrometer-reference instrument WBS 1.7.12. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/12074.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Crawford, R. K. INEL4-wide-angle chopper spectrometer-reference instrument WBS 1.7.7. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/12082.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Prof. Brent Fultz and Dr. Doug Abernathy. ARCS A wide-Anglular Range Chopper Spectrometer at the SNS. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/835574.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ciezki, John G., and Robert W. Ashton. Analysis of a PWM Resonant Buck Chopper for Use as a Ship Service Converter Module. Fort Belvoir, VA: Defense Technical Information Center, January 1999. http://dx.doi.org/10.21236/ada361136.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hedden, Abigail S., Charles C. Dietlein, and David A. Wikner. Effects of Cylindrical Chopper Geometry on Calculating Power Coupling Efficiency and Noise Equivalent Temperature Difference. Fort Belvoir, VA: Defense Technical Information Center, January 2011. http://dx.doi.org/10.21236/ada535781.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Chopper' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography