Journal articles: 'Digital Pump'

1

Yue, Daling, Xiukun Zuo, Zengguang Liu, Yinshui Liu, Liejiang Wei, and Yuyang Zhao. "An Adaptive Control Method for the Distribution Valve of a Digital Pump." Machines 11, no. 2 (January 21, 2023): 148. http://dx.doi.org/10.3390/machines11020148.

Full text

Abstract:

Perfect flow distribution is extremely important and essential for digital pumps. However, the fluctuation of motor speed and the change of valve dynamic characteristics cause the flow distribution flaw, which generates the backflow of the oil in the piston chamber and the decrease in pump volumetric efficiency. Based on the three-dimensional and mathematical modeling of the digital pump, the perfect distribution state of the digital pump is analyzed. Then, the adverse effects of the variations in motor speed and valve dynamic characteristics on the flow distribution of the digital pump were simulated and investigated by the software AMESim. To overcome the aforementioned problems, we proposed an adaptive control method for the flow distribution valve of a digital pump, which was realized by adopting the axis rotation angle and the pressure difference between the inlet and outlet of the flow distribution valve. The results show that the control signal of the flow distribution valve can be regulated automatically along with the motor speed and the valve dynamic characteristics, achieving the ideal flow distribution of the digital pump designed in this paper. The study can be used as a reference for the optimal design and prototype manufacturing of the digital pump.

APA, Harvard, Vancouver, ISO, and other styles

2

Sato, Daisuke, Yosuke Watanabe, Jun Ogawa, Nahin Islam Shiblee, Ajit Khosla, Masaru Kawakami, and Hidemitsu Furukawa. "(Digital Presentation) Development of a Low-Torque Transfer System Using a Progressive Cavity Pumps with Gels." ECS Meeting Abstracts MA2022-01, no. 57 (July 7, 2022): 2375. http://dx.doi.org/10.1149/ma2022-01572375mtgabs.

Full text

Abstract:

Progressive cavity pumps (PCPs) consist of a rotor and a stator. The extrusion process of PCPs is governed by a single-helical rotor which rotates eccentrically within a double-helical stator of twice the pitch length. Between the seal lines (the contact lines of rotor and stator), there are cavities which are constantly moved towards the discharge end of the pump. As one cavity is eliminated, another cavity develops, keeping the cross-sectional area of the cavities constant. The process makes a continuous non-pulsating flow in the PCPs. The developed pushing–and–suction action allows PCPs to exert significantly lower shear rates on the pumped material, compared to other pump types, such as membrane pumps or peristaltic pumps. However, the sliding of the rotor and stator in the pump causes a biting phenomenon [1-3]. Therefore, the degradation of particles in the fluid occurs. In this study, we adopted a flexible, low-friction gels as the stator material. By using gels materials as stator, we could make a pump that could discharge at low torque as previously reported by our group [4]. In this work, the rubber stator and the gels stator fabricated by 3D printing were compared and evaluated by performing discharge and torque test. References: [1] K. Nishimura, E. Uetsuji, and Y. Iwai, “Study on the Behavior of Particles in the Sliding Portion of a Progressive Cavity Pump”, Journal of Japanese Society of Tribologists, Vol. 63 (2018), No. 9 pp. 641-650 [2] P. Fisch, M. Holub, and M. Z. Wong, “Improved accuracy and precision of bioprinting through progressive cavity pump-controlled extrusion”, 2021 Biofabrication 13 015012 [3] M. Horie, S. Shigemitsu, S. Ookura, “Fundamental Study on Pediatric Single Eccentric Screw Blood Pump”, Turbomachinery, vol. 43(2015), No.4 pp.222-228 [4] Yeh, Yee Cheng, Naoya Yamada, Yosuke Watanabe, MD Nahin Islam Shiblee, Jun Ogawa, Ajit Khosla, Masaru Kawakami, Teruaki Akamatsu, and Hidemitsu Furukawa. “3D Printing of Soft-Matter Mono Pump in Infant Ventricular Assist Device (VAD) for Blood Pumping” ECS Transactions 98, no. 13 (2020): 31.

APA, Harvard, Vancouver, ISO, and other styles

3

Breidi, Farid, Jordan Garrity, and John Lumkes. "Design and Testing of Novel Hydraulic Pump/Motors to Improve the Efficiency of Agricultural Equipment." Transactions of the ASABE 60, no. 6 (2017): 1809–17. http://dx.doi.org/10.13031/trans.11557.

Full text

Abstract:

Abstract. Hydraulic systems are prevalent in agricultural machinery and equipment and can be found transmitting power for vehicle drive wheels, powering attachments, and controlling motion (booms, steering, load height, etc.). Agricultural applications of fluid power have advanced in terms of capability and efficiency, but opportunities remain for significant improvements in efficiency, noise reduction, and reliability. The average system-level hydraulic efficiency of current mobile agricultural machines is only 21.1%. Because nearly all hydraulic systems use pumps to convert engine power to fluid power, improving the efficiency of the pumps (and motors when used as actuators) significantly impacts the system efficiency. This work examines the impact of using more efficient digital pump/motors to improve the overall efficiency of agricultural equipment, such as tractors, harvesters, planters, fertilizers, sprayers, and attachments. Maintaining higher pump/motor efficiency throughout the operating range is the central principal for the energy savings. Currently used variable-displacement pumps have low efficiencies at low displacement levels due to constant losses that do not scale with the power produced. Digital pump/motors minimize these inefficiencies because energy losses scale more closely with the power produced. Experimental results indicate an average efficiency of 85% when operating at 20% to 100% displacement. This efficiency is 15% to 20% higher on average than with current variable-displacement axial piston pumps. This study demonstrates that achieving this improvement in the efficiency of the pump/motors used in tractors and harvesters alone would conservatively save $61.7 million worth of energy annually for end users in the U.S. agricultural sector. Keywords: Agricultural equipment, Digital hydraulics, Efficiency improvement, Hydraulic pump/motor.

APA, Harvard, Vancouver, ISO, and other styles

4

Zagar, Philipp, Helmut Kogler, Rudolf Scheidl, and Bernd Winkler. "Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives." Actuators 9, no. 4 (December 4, 2020): 129. http://dx.doi.org/10.3390/act9040129.

Full text

Abstract:

Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from the mixed lubrication conditions in such an operation range. For a circumvention of such low speed pump operation, a digital valve control concept is presented and studied in this paper. Valve control is used in load holding phases with low speed. Pressure is provided by an accumulator which is charged by the pump in short charging cycles at reasonable pump speeds. It is shown that the mean control error during load holding phase lies within the desired band and the fluctuations of the control force are lower than those of the pump control. In addition, the unfavorable pump operation conditions can be avoided via digital control.

APA, Harvard, Vancouver, ISO, and other styles

5

Azzam, Israa, Keith Pate, Jose Garcia-Bravo, and Farid Breidi. "Energy Savings in Hydraulic Hybrid Transmissions through Digital Hydraulics Technology." Energies 15, no. 4 (February 13, 2022): 1348. http://dx.doi.org/10.3390/en15041348.

Full text

Abstract:

Hydraulic hybrid drivetrains, which are fluid power technologies implemented in automobiles, present a popular alternative to conventional drivetrain architectures due to their high energy savings, flexibility in power transmission, and ease of operation. Hydraulic hybrid drivetrains offer multiple environmental benefits compared to other power transmission technologies. They provide heavy-duty vehicles, e.g., commercial transportation, construction equipment, wagon handling, drilling machines, and military trucks, with the potential to achieve better fuel economy and lower carbon emissions. Despite the preponderance of hydraulic hybrid transmissions, state-of-the-art hydraulic hybrid drivetrains have relatively low efficiencies, around 64% to 81%. This low efficiency is due to the utilization of conventional variable displacement pumps and motors that experience high power losses throughout the drive cycle and thus fail to maintain high operating efficiency at lower volumetric displacements. This work proposes and validates a new methodology to improve the overall efficiency of hydraulic hybrid drivetrains by replacing conventional pump/motor units with their digital counterparts. Compared to conventional pump/motors, the digital pump/motor can achieve higher overall efficiencies at a wide range of operating conditions. A proof-of-concept digital pump/motor prototype was built and tested. The experimental data were integrated into a multi-domain physics-based simulation model of a series hydraulic hybrid transmission. The proposed methodology permits enhancing the overall efficiency of a series hydraulic hybrid transmission and thus allows for energy savings. Simulating the system at moderate load-speed conditions allowed achieving a total efficiency of around 89%. Compared to the average efficiency of the series hydraulic hybrid drivetrains, our simulation results reveal that the utilization of the state-of-the-art digital pump enables improving the total efficiency of the series hydraulic hybrid drivetrain by up to 25%.

APA, Harvard, Vancouver, ISO, and other styles

6

Ballo, Andrea, Michele Bottaro, Alfio Dario Grasso, and Gaetano Palumbo. "Regulated Charge Pumps: A Comparative Study by Means of Verilog-AMS." Electronics 9, no. 6 (June 15, 2020): 998. http://dx.doi.org/10.3390/electronics9060998.

Full text

Abstract:

This paper proposes a comparative study of regulation schemes for charge-pump-based voltage generators using behavioral models in Verilog- Analog Mixed Signal (AMS) code. An accurate and simple model of the charge pump is first introduced. It allows reducing the simulation time of complex electronic systems made up by both analog and digital circuits while maintaining a good agreement with transistor-level simulations. Finally, a comprehensive comparative study of the different regulation schemes for charge pumps is reported which allows the designer to choose the most suitable topology for a given application and Charge Pump (CP) operative zone.

APA, Harvard, Vancouver, ISO, and other styles

7

Anjum, Gazala. "Automated Digital Petrol Pump using Arduino ATmega2560." International Journal for Research in Applied Science and Engineering Technology 7, no. 9 (September 30, 2019): 977–82. http://dx.doi.org/10.22214/ijraset.2019.9136.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Rokhman, Mukhamad Ryan Nur, Bambang Guruh Irianto, and Her Gumiwang Ariswati. "Digital Pressure Meter Tensimeter Dan Suction Pump." Jurnal Teknokes 12, no. 1 (September 19, 2019): 1–4. http://dx.doi.org/10.35882/teknokes.v12i1.1.

Full text

Abstract:

Kalibrasi merupakan suatu kegiatan teknis yang terdiri atas penetapan, penentuan satu atau lebih sifat dan karakteristik dari suatu produk, proses atau jasa sesuai dengan prosedur khusus yang telah ditetapkan. Tujuan kalibrasi yaitu untuk menjamin hasil pengukuran sesuai dengan standar nasional maupun internasional. Digital pressure meter (DPM) Tensimeter dan Suction Pump merupakan alat kalibrasi yang digunakan untuk menentukan tekanan positif maupun negatif (vacum). Memiliki titik resolusi naik turun 0,25 mmHg. Display yang digunakan pada modul ini adalah LCD 4x20 dimana pemograman keseluruhan menggunakan arduino ATmega328. Setelah melalui proses pembandingan dengan alat Pressure Calibrator di BPFK yang terkalibrasi di dapat nilai kesalahan dan error cukup rendah untuk nilai kesalahan pada tekanan positif bernilai kurang dari 0,83 mmHg, dan kurang dari 0,67 untuk tekanan negatif. Memiliki hasil rata-rata error sebesar 0,24% untuk tekanan positif dan tekanan negative.

APA, Harvard, Vancouver, ISO, and other styles

9

Min Hu, Hejun Du, and Shihfu Ling. "A digital miniature pump for medical applications." IEEE/ASME Transactions on Mechatronics 7, no. 4 (December 2002): 519–23. http://dx.doi.org/10.1109/tmech.2002.805620.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Shrestha, Rajesh, Arun Raj Dhakal, Saroj Thakur, Dipak Subedi, and Mahesh Sharma. "Design of Digital Solar Water Pump Using Microcontroller ATmega 32." Electrical Science & Engineering 4, no. 2 (October 19, 2022): 11. http://dx.doi.org/10.30564/ese.v4i2.4945.

Full text

Abstract:

This paper focuses on the application of solar energy along with microcontrollers to design and run a motor to pump water from various sources. The solar water pump is one of the applications or appliance that perform task with the use of solar radiation. The solar water pump consists of solar PV array, solar pump, inverter, AC water pumping device etc. Solar energy radiation is converted in electrical current or power source which is then used to run a pump and draw water directly from ground, wells, rivers, lakes etc. In this paper, the relationship between flow rate of the water and luminous intensity of the solar irradiance is studied and the data are linearly fitted to find out the correlation between these parameters. Also the study about efficiency of the solar powered water pump shows that the operation of this type of pumping system is quite efficient than other types of fossil fuel engines like diesel, petrol, kerosene etc. in long run. The use of Arduino Uno, flow sensor, LDR sensors in the solar powered water pump helps to analyze the relation between these parameters and know the conditions favorable for excess supply of water in short time efficiently. These solar powered devices are the future of clean and green future of this world. Thus it is not only necessary but also compulsory to enhance the usage of solar energy throughout the globe.

APA, Harvard, Vancouver, ISO, and other styles

11

Tian, Jie, Wenchao Liu, and Hongyao Wang. "Testing Method for Intelligent Loading of Mining Emulsion Pump Based on Digital Relief Valve and BP Neural Network Control Algorithm." Machines 10, no. 10 (October 5, 2022): 896. http://dx.doi.org/10.3390/machines10100896.

Full text

Abstract:

The mining emulsion pump is mainly used on a fully mechanized coal mining face, but it is rarely used on other occasions, so research on its loading test method is relatively limited. This paper proposes the application of a digital relief valve to the emulsion pump loading test. In addition, the small number of plungers in the emulsion pump will lead to large flow pulsation and pressure pulsation, and the nominal flow of different types of emulsion pumps varies greatly. These factors lead to the deficiency of a traditional PID control algorithm in control accuracy and efficiency. In order to improve control accuracy and efficiency, firstly, the influence of the flow rate of the tested pump and extension of the linear stepping motor shaft on the working pressure is studied. A backpropagation (BP) artificial neural network (ANN) model is used to fit a functional relationship between the three parameters. The flow rate of the tested pump and target pressure were provided as inputs to predict the extension of the linear stepping motor shaft, thereby realizing the remote intelligent control of the system pressure. Next, a BP ANN model is constructed, and its reliability is verified; the BP neural network algorithm and proportional-integral-derivative (PID) algorithm are compared through simulation. The simulation results show that the BP neural network algorithm has high control accuracy and small overshoot. Finally, two pumps with different flows are tested in a self-developed digital relief valve and test platform. The test results show that the proposed loading test method is intelligent and efficient, and it has high accuracy.

APA, Harvard, Vancouver, ISO, and other styles

12

Pedersen, Henrik C., Per Johansen, Cemre Yigen, Torben O. Andersen, and Daniel B. Rømer. "Analysis of Temperature's Influence on a Digital Displacement Pump's Volumetric Efficiency." Applied Mechanics and Materials 233 (November 2012): 24–27. http://dx.doi.org/10.4028/www.scientific.net/amm.233.24.

Full text

Abstract:

The focus of the current paper is on a small 18 cm3/rev Digital Displacement Pump (DDP), where it is investigated how temperature influency the pump behaviour and static performance. An experimentally validated model of the DDP is presented, which is the basis for the investigation. From the results it is found that although the temperature highly influences the pump behaviour it is possible to mostly compensate for this by accurately controlling the closing angle of the low pressure valve.

APA, Harvard, Vancouver, ISO, and other styles

13

Edge, K. A., and P. N. Brett. "The Pumping Dynamics of a Positive Displacement Pump Employing Self-Acting Valves." Journal of Dynamic Systems, Measurement, and Control 112, no. 4 (December 1, 1990): 748–54. http://dx.doi.org/10.1115/1.2896204.

Full text

Abstract:

The paper describes a general purpose digital computer model for the analysis of the pumping dynamics of positive displacement pumps employing self-acting valves. This model is verified by comparison with experimental tests on a diaphragm separator pump. Predicted and simulated cylinder pressure transients and inlet and delivery valve dynamics are compared over the complete pumping cycle. Close agreement between theory and experiment is achieved. The induction performance of the pump is examined in detail and the effects of operating conditions on volumetric efficiency are presented. The effect of inlet valve timing on delivery manifold pressure fluctuations is also discussed.

APA, Harvard, Vancouver, ISO, and other styles

14

Ułanowicz, Leszek, Grzegorz Jastrzębski, Paweł Szczepaniak, Ryszard Sabak, and Dariusz Rykaczewski. "Malfunctions of Aviation Hydraulic Pumps." Journal of KONBiN 50, no. 3 (October 1, 2020): 257–76. http://dx.doi.org/10.2478/jok-2020-0061.

Full text

Abstract:

AbstractHydraulic pumps are among the most complex and responsible units from the point of view of aircraft flight safety. One of the most important scientific and technical problems in improving the reliability of hydraulic pumps is to understand the physical nature of the cause of damage in them and on this basis to develop measures and recommendations to ensure their reliability. The article discusses the characteristics of hydraulic piston pairs of hydraulic pumps according to the kinematics of their movement and load conditions. Selected actual damages of axial piston pumps are discussed. The paper presents a simplified 3D solid model of the cylinder-piston assembly and the mechanism for adjusting the inclination of the piston cylinder block, the axial hydraulic pump, and the model of breaking loads for selected elements of this pump. The digital solid model and element load analysis were developed in SolidWorks Simulation.

APA, Harvard, Vancouver, ISO, and other styles

15

Zhao, Kaiping, Tao He, Chuanli Wang, Qiangman Chen, and Zhipeng Li. "Lubrication characteristics analysis of slipper pair of digital valve distribution axial piston pump." Advances in Mechanical Engineering 14, no. 3 (March 2022): 168781322210854. http://dx.doi.org/10.1177/16878132221085442.

Full text

Abstract:

The digital valve distribution axial piston pump is a swashplate rotary piston pump, the force on slippers is different from that of traditional axial piston pump. At the same time, the control strategy of the distribution valve will affect the pressure in the piston cavity, and then affect the oil film lubrication. According to these characteristics, the modeling method of oil film thickness field was proposed, and the force model of slipper pair and the numerical solution model of oil film lubrication of digital valve distribution axial piston pump were further established. The influence of swashplate rotation speed, swashplate inclination angle, and distribution valve control strategy on the characteristics of oil film lubrication were solved. The results show that the established thickness field model of oil film conforms to the stress characteristics of the slipper of the valve distribution pump. Increasing the swashplate rotation speed and the swashplate inclination angle is beneficial to optimize the oil film lubrication performance. The discharge valve should be opened in advance or closed in delay, which is beneficial to prevent eccentric wear and adhesion wear of slippers. The research results can provide theoretical basis for the optimal design of valve distribution axial piston pump.

APA, Harvard, Vancouver, ISO, and other styles

16

Chen, Lei, Lijun Wei, Yu Wang, Junshuo Wang, and Wenlong Li. "Monitoring and Predictive Maintenance of Centrifugal Pumps Based on Smart Sensors." Sensors 22, no. 6 (March 9, 2022): 2106. http://dx.doi.org/10.3390/s22062106.

Full text

Abstract:

Centrifugal pumps have a wide range of applications in industrial and municipal water affairs. During the use of centrifugal pumps, failures such as bearing wear, blade damage, impeller imbalance, shaft misalignment, cavitation, water hammer, etc., often occur. It is of great importance to use smart sensors and digital Internet of Things (IoT) systems to monitor the real-time operating status of pumps and predict potential failures for achieving predictive maintenance of pumps and improving the intelligence level of machine health management. Firstly, the common fault forms of centrifugal pumps and the characteristics of vibration signals when a fault occurs are introduced. Secondly, the centrifugal pump monitoring IoT system is designed. The system is mainly composed of wireless sensors, wired sensors, data collectors, and cloud servers. Then, the microelectromechanical system (MEMS) chip is used to design a wireless vibration temperature integrated sensor, a wired vibration temperature integrated sensor, and a data collector to monitor the running state of the pump. The designed wireless sensor communicates with the server through Narrow Band Internet of Things (NB-IoT). The output of the wired sensor is connected to the data collector, and the designed collector can communicate with the server through 4G communication. Through cloud-side collaboration, real-time monitoring of the running status of centrifugal pumps and intelligent diagnosis of centrifugal pump faults are realized. Finally, on-site testing and application verification of the system was conducted. The test results show that the designed sensors and sensor application system can make good use of the centrifugal pump failure mechanism to automatically diagnose equipment failures. Moreover, the diagnostic accuracy rate is above 85% by using the method of wired sensor and collector. As a low-cost and easy-to-implement solution, wireless sensors can also monitor gradual failures well. The research on the sensors and pump monitoring system provides feasible methods and an effective means for the application of centrifugal pump health management and predictive maintenance.

APA, Harvard, Vancouver, ISO, and other styles

17

Roemer, Daniel Beck, Per Johansen, Henrik C. Pedersen, and Torben O. Andersen. "Method for Lumped Parameter Simulation of Digital Displacement Pumps/Motors Based on CFD." Applied Mechanics and Materials 397-400 (September 2013): 615–20. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.615.

Full text

Abstract:

Digital displacement fluid power pumps/motors offers improved efficiency and performance compared to traditional variable displacement pump/motors. These improvements are made possible by using efficient electronically controlled seat valves and careful design of the flow geometry. To optimize the design and control of digital displacement machines, there is a need for simulation models, preferably models with low computational cost. Therefore, a low computational cost generic lumped parameter model of digital displacement machine is presented, including a method for determining the needed model parameters based on steady CFD results, in order to take detailed geometry information into account. The response of the lumped parameter model is compared to a computational expensive transient CFD model for an example geometry.

APA, Harvard, Vancouver, ISO, and other styles

18

Pareja-Corcho, Juan, Aitor Moreno, Bruno Simoes, Asier Pedrera-Busselo, Ekain San-Jose, Oscar Ruiz-Salguero, and Jorge Posada. "A Virtual Prototype for Fast Design and Visualization of Gerotor Pumps." Applied Sciences 11, no. 3 (January 28, 2021): 1190. http://dx.doi.org/10.3390/app11031190.

Full text

Abstract:

In the context of generation of lubrication flows, gear pumps are widely used, with gerotor-type pumps being specially popular, given their low cost, high compactness, and reliability. The design process of gerotor pumps requires the simulation of the fluid dynamics phenomena that characterize the fluid displacement by the pump. Designers and researchers mainly rely on these methods: (i) computational fluid dynamics (CFD) and (ii) lumped parameter models. CFD methods are accurate in predicting the behavior of the pump, at the expense of large computing resources and time. On the other hand, Lumped Parameter models are fast and they do not require CFD software, at the expense of diminished accuracy. Usually, Lumped Parameter fluid simulation is mounted on specialized black-box visual programming platforms. The resulting pressures and flow rates are then fed to the design software. In response to the current status, this manuscript reports a virtual prototype to be used in the context of a Digital Twin tool. Our approach: (1) integrates pump design, fast approximate simulation, and result visualization processes, (2) does not require an external numerical solver platforms for the approximate model, (3) allows for the fast simulation of gerotor performance using sensor data to feed the simulation model, and (4) compares simulated data vs. imported gerotor operational data. Our results show good agreement between our prediction and CFD-based simulations of the actual pump. Future work is required in predicting rotor micro-movements and cavitation effects, as well as further integration of the physical pump with the software tool.

APA, Harvard, Vancouver, ISO, and other styles

19

Ma, Kai. "The Research of Digital Display Pump Test Stand Based on IPC." Applied Mechanics and Materials 300-301 (February 2013): 1546–50. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.1546.

Full text

Abstract:

This paper present the overall design of measurement and control system of digital display pump test stand based on IPC. IPC and NI LabVIEW were adopted in this system to realize many functions such as the rotation speed regulation of driving axis on pump test stand, measurement of fuel injection quantity and oil temperature, measurement and control of oil pressure, and so on.

APA, Harvard, Vancouver, ISO, and other styles

20

Singh, Anil, and Alpana Agarwal. "Digital background calibration of charge pump based pipelined ADC." International Journal of Electronics 103, no. 11 (March 28, 2016): 1941–53. http://dx.doi.org/10.1080/00207217.2016.1150550.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Baldwin, Phil C. "A current-controlled digital liquid pump with electroplating applications." Metal Finishing 95, no. 4 (April 1997): 26–27. http://dx.doi.org/10.1016/s0026-0576(97)86040-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ly, Trang T., Jennifer E. Layne, Lauren M. Huyett, David Nazzaro, and Jason B. O’Connor. "Novel Bluetooth-Enabled Tubeless Insulin Pump: Innovating Pump Therapy for Patients in the Digital Age." Journal of Diabetes Science and Technology 13, no. 1 (September 21, 2018): 20–26. http://dx.doi.org/10.1177/1932296818798836.

Full text

Abstract:

The Omnipod DASH™ Insulin Management System (Insulet Corp, Billerica, MA) is a discreet, tubeless, wearable insulin pump that holds up to 200 units of U-100 insulin and delivers therapy through customizable basal rates and bolus amounts. This recently FDA-cleared system consists of the insulin pump (“Pod”), which is worn on body and delivers insulin, and the Personal Diabetes Manager (PDM), which is a handheld device used to wirelessly control and monitor the Pod functionality. The PDM can also be paired with the CONTOUR® NEXT ONE blood glucose (BG) meter (Ascensia Diabetes Care, Basel, Switzerland) to wirelessly receive BG readings. This review provides a detailed description of the Pod and PDM. Key features of the Pod are described, including the novel pump delivery mechanism, waterproof (IP28) housing design, and automated cannula insertion. The technology introduced in the new system, such as touchscreen PDM interface, Bluetooth® wireless technology, and wireless internet connectivity, is also presented. Last, Omnipod® Insulin Management System clinical data are reviewed, including early feasibility results for the Omnipod Horizon™ Automated Glucose Control hybrid closed-loop system.

APA, Harvard, Vancouver, ISO, and other styles

23

Sheng, Xiao Ming. "Digital Control Hydraulic Variable Pump Based on Mechatronic-Hydraulic-Air Integration Driven by Compressed Air." Advanced Materials Research 291-294 (July 2011): 2643–46. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2643.

Full text

Abstract:

This paper introduces digital control hydraulic variable pump based on mechatronic-hydraulic- air integration driven by compressed air. By inserting the toggle force amplifier in between double-acting rodless air cylinder and variable pump, this pump, driven by compressed air, utilizes small forced air to create big output power. The displacement of air cylinder piston is measured by using digitally linear displacement sensor and it is compared with input signal by computer in order to control pressure and flow rate output by hydraulic cylinder. This pump provides high flexibility and high reliability, simple structure and compact; it is easier to control by artificial intelligence and it will be widely used in the industry.

APA, Harvard, Vancouver, ISO, and other styles

24

Mseli, Zaina Hussein, Devon Goeller, Mackenzie Scharenberg, William J. S. Mwegoha, Rebecca Gianotti, David Bongiorno, and Audrey H. Sawyer. "Physical factors limiting access to clean groundwater in Tanzania villages." Journal of Water, Sanitation and Hygiene for Development 9, no. 3 (May 20, 2019): 531–39. http://dx.doi.org/10.2166/washdev.2019.198.

Full text

Abstract:

Abstract Low yield, poor water quality, and nonfunctional infrastructure impede physical access to clean groundwater in rural Tanzania. We studied boreholes in 45 villages as part of a rehabilitation program led by the Global Water Institute at The Ohio State University. Villages were chosen because their groundwater supply systems were inoperative or unsustainable. The most common cause was pump failure, which occurred in more than half of the villages. Even if broken pumps were repaired or replaced, low pump capacities and potential yields would limit physical access in many villages. Low potential yield is often mistaken for a broken pump, but easily diagnosed with a pump test. Pump test records were available for only eight villages, highlighting the need for more testing and data accessibility. One-third of the villages had low water quality. In comparison to secondary water sources such as springs, impoundments, and dug wells, boreholes tended to have lower levels of nitrate and fecal coliform, greater total dissolved solids, and similar fluoride levels. In many villages, groundwater is the only viable water resource to support development, but drilling records and hydrogeologic data are sparse. We recommend better digital data archiving with governmental water supply authorities and the assessment of potential well yields and sustainable yields.

APA, Harvard, Vancouver, ISO, and other styles

25

Davis, Gabriel Suneel, and Mr Mohammad Sameer Baig. "Digital Planting Pot for Smart Irrigation." Asian Journal of Applied Science and Technology 06, no. 04 (2022): 50–56. http://dx.doi.org/10.38177/ajast.2022.6405.

Full text

Abstract:

Watering plants during the correct time is very important due to scientific reasons. Both under-watering, as well as overwatering, can lead to the growth of unhealthy plants or in extreme cases, the death of the plant/tree. These issues which are the case with most self-gardeners and plant lovers can be solved using the smart irrigation technique. The main purpose of this innovation is to assist plant lovers to continue their passion to grow plants at home with ease. Smart irrigation system helps in monitoring the moisture level which majorly affects plant growth besides other factors such as sunlight, fertility of the soil, etc. The digital planting pot has been designed in a way that it effectively incorporates the idea of smart irrigation. Arduino Uno R3 has been used as the main chip in this project along with a few other components like a soil moisture sensor, relay, and water pump. This project requires coding to synchronize all the components, and function properly. A required test has been carried out to review the functioning of the mechanism. The project was tested by once using the soil with enough moisture in the pot and then the soil with the least moisture. Both times, it worked exactly how it was supposed to function. When the soil with the least moisture was tested, there was a clear indication of a low level of moisture and accordingly, the water pump got triggered to water the plant, and when the soil with enough moisture was tested, there was again the clear indication of the correct level of moisture and the water pump was inactive. All the readings which were displayed on the LCD were checked back and forth during the project. The outcomes were the same as expected. Hence, it shows that every component in this project is actively functioning and the whole project is effectively designed.

APA, Harvard, Vancouver, ISO, and other styles

26

Li, Chunshuang, Xinhui Liu, Xin Wang, Jinshi Chen, and Yuqi Wang. "Optimization of Multi-Way Valve Structure in Digital Hydraulic System of Loader." Energies 14, no. 3 (January 29, 2021): 700. http://dx.doi.org/10.3390/en14030700.

Full text

Abstract:

In this paper, a digital hydraulic variable control method based on multi-way valve spool displacement feedback is proposed, which combines the advantages of low cost and high reliability of the loader fixed displacement pump hydraulic system, and the distinguished energy saving effect of the loader variable pump hydraulic system. Based on the principle of hydraulic resistance, the mathematical model of flow-pressure of multi-way valve was established. Meanwhile, the theoretical structure of a valve spool suitable for digital hydraulic system was deduced. On this basis, an improvement scheme of the valve spool was proposed in combination with machining feasibility. The simulation model of multi-way valve was established, the correctness of which was verified by experiment with the significance test method, and the valve port parameters of the multi-way valve were optimized by genetic algorithm. The simulation model before and after optimization was analyzed by AMESim software. The simulation results showed that the digital hydraulic system can basically realize the function of a variable system, and the energy consumption was significantly reduced compared with the fixed displacement pump hydraulic system. The optimized valve spool structure of the digital hydraulic system had more stable load characteristics than the fixed displacement pump system and a larger speed range. The increase range accounts for about 27% of the total stroke.

APA, Harvard, Vancouver, ISO, and other styles

27

Bori, Ige, Ebubechukwu Jude Uwah, Sunday Bako, Olawale James Okegbile, and Samuel Adinoyi Ayo. "Design and Performance Evaluation of a Portable Solar Water Heater." Advances in Multidisciplinary and scientific Research Journal Publication 10, no. 1 (March 15, 2022): 49–62. http://dx.doi.org/10.22624/aims/digital/v10n1p5.

Full text

Abstract:

This paper presents design and performance evaluation of a solar water heater (SWH) using thermosyphon principles, thereby eliminating the use of electric water pump and reducing the cost of the entire system. There are many phenomena encouraging the application of solar water heating technology such as; electric power outage, high fuel price, rapid urbanization, low cost of installations, and governmental intervention. Therefore, there is need to encourage innovation in the field of solar technology. The design of this system was done using relevant equations to obtain the required dimensions of the various components of the system. The materials were selected based on design calculations, machining, availability and material cost. During the testing process, the first three days of testing the highest outlet temperature recorded was 650C. For the last three days of testing during the dry season, the highest outlet temperature recorded was 79.3 0C. The results showed that the system performs better during the dry season when the irradiance levels are higher. The highest irradiance recorded was 940 W/m2 on the sixth day of testing. The highest efficiency recorded from the system was 68.19% on the fourth day of testing. It is hereby recommended that, sensor and a flow meter should be installed for determining water level and for easy identification of flow rate. Keywords: Solar Water Heater, Thermosyphon, Design, Development, and Performance Testing

APA, Harvard, Vancouver, ISO, and other styles

28

Li, Weijian, Zhuxin Zhang, Tao Liu, Hengyi Cao, Tao Ni, and Yafei Wang. "Analysis of and Experimental Research on a Hydraulic Traction System Based on a Digital Hydraulic Transformer." Sensors 22, no. 10 (May 10, 2022): 3624. http://dx.doi.org/10.3390/s22103624.

Full text

Abstract:

In this study, we designed a new type of digital hydraulic transformer using four gear–pump/motor units with a displacement ratio of 20:21:22:23 and two control valve groups that consist of four solenoid directional valves. The driving gear shafts of the four gear–pump/motor units are fixedly connected to achieve synchronous rotation. The two control valve groups are respectively installed through an integrated valve block on the inlet and outlet of each gear–pump/motor unit. With the objective of reducing the installed power and energy consumption of hydraulic traction systems, we propose a new energy-saving hydraulic system based on a digital hydraulic transformer. This hydraulic system uses a digital hydraulic transformer as a pressure/flow control element. By controlling the power on/off states of eight solenoid directional valves, the digital hydraulic transformer can realize a change in output flow and then a change in speed of the hydraulic cylinder piston rod. Through the theoretical derivation and simulation analysis of the hydraulic system pressure/flow change process, and the experimental verification of the built hydraulic traction system based on the experimental platform, a conclusion is drawn that the proposed digital hydraulic transformer can change the output pressure/flow of a hydraulic system through a binary digital control, verifying the feasibility of the pressure change principle of the designed digital hydraulic transformer and the rationality of the hydraulic traction system circuit.

APA, Harvard, Vancouver, ISO, and other styles

29

Wang, Kai Yu, Zhe Nan Tang, and Tao Ge. "The Design and Simulation of a CMOS Digital PLL." Applied Mechanics and Materials 48-49 (February 2011): 1227–30. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.1227.

Full text

Abstract:

In this paper, the charge-pump PLL structure is well analyzed. By using top-down method, the digital PLL is designed from frequency phase detector, charge pump, loop filter, VCO to frequency divider. Based on 0.5μm CMOS mixed signal process, the schematic and layout design is finished on Cadence IC 5.1.4.1, and Hspice is used for the simulation. The layout verification and parasitic extraction is completed on industry mainstream Calibre software. Simulation results show that the digital PLL is with a 100MHz center frequency, the locking range is between 20MHz~60MHz, the locking time is less than 1.5μs, and phase noise is -105dBc/Hz. The design has implemented the digital signal lock function and it can be used as an IP hard core in the clock recovery of communication systems and frequency synthesis of digital systems.

APA, Harvard, Vancouver, ISO, and other styles

30

Negulescu, P. A., and T. E. Machen. "Ca transport by plasma membrane and intracellular stores of gastric cells." American Journal of Physiology-Cell Physiology 264, no. 4 (April 1, 1993): C843—C851. http://dx.doi.org/10.1152/ajpcell.1993.264.4.c843.

Full text

Abstract:

The relative Ca transport activities (i.e., of both pumps and leaks) of carbachol-releasable intracellular stores and the basolateral plasma membrane of gastric parietal cells were studied using digital image processing of fura-2 fluorescence. Cells were treated with either carbachol (a cholinergic agonist) or thapsigargin (an inhibitor of microsomal Ca-adenosinetriphosphatase) or a combination of the two. Ca-free solutions were used to selectively investigate intracellular store release and plasma membrane pump activity, whereas Ca-containing solutions were used to investigate Ca influx and refilling of the intracellular pool. In the resting cell depletion of the intracellular pool in Ca-free solutions was 15-fold faster than control in the presence of thapsigargin, indicating the efficient (> 90%) recycling of leaked Ca by the store Ca pump. Stimulation with carbachol increased the rate of pool depletion by 70-fold, and this Ca flux out of the internal store was ten times larger than the flux across the plasma membrane. Thus the internal store has ten times greater fluxes (both leaks and pumps) than the plasma membrane during resting and stimulated conditions. After carbachol removal (i.e., reloading) the permeability of the internal store decreases, whereas increased influx across the plasma membrane persists until the store is refilled. Cytoplasmic Ca does not increase during refilling because the intracellular store pump operates eightfold faster than the plasma membrane pump, effectively sequestering Ca as quickly as it enters the cell.

APA, Harvard, Vancouver, ISO, and other styles

31

Ehsan, Md, W. H. S. Rampen, and S. H. Salter. "Modeling of Digital-Displacement Pump-Motors and Their Application as Hydraulic Drives for Nonuniform Loads." Journal of Dynamic Systems, Measurement, and Control 122, no. 1 (June 26, 1997): 210–15. http://dx.doi.org/10.1115/1.482444.

Full text

Abstract:

The digital-displacement pump-motor is a hybrid device, which combines reciprocating hydraulics with micro-processor control, creating a highly integrated machine capable of producing variable flow and power. It is based on the conventional hydraulic piston pump but with actively controlled poppet valves for each cylinder. This allows enabling or disabling on a stroke-by-stroke basis in any desired sequence. Time-domain modeling of the pump-motor system predicts the performance under variable-demand, variable-speed at different control-modes. The advantages of this approach over conventional techniques lie with both the response speed and the inherent energy efficiency. [S0022-0434(00)00801-7]

APA, Harvard, Vancouver, ISO, and other styles

32

Fedosov, S. V., V. N. Fedoseev, V. A. Emelin, and S. A. Loginova. "Digital technological model of heat exchange control in an air heat pump in a low-rise building." Journal of Physics: Conference Series 2131, no. 5 (December 1, 2021): 052080. http://dx.doi.org/10.1088/1742-6596/2131/5/052080.

Full text

Abstract:

Abstract The use of air source heat pumps together with other renewable energy devices and highly efficient heating equipment together with digital control systems is a promising European trend that continues to grow in the face of rising prices for traditional energy sources. The article presents a number of technical energy-saving solutions, such as a mixing chamber for HVH, built into the heat supply system and the use of a supply and exhaust ventilation system, in which the principle of recuperation is incorporated. A digital modular-functional-structural diagram of heat generation of a heat carrier from the environment is proposed. Relying on the energy efficiency of the circuit design with an electric boiler, a buffer tank and a patented mixing chamber, the authors achieve a rationally controlled heat and air exchange of a combined heat pump system for heating premises. Automation of the joint work of rationally selected elements of the heat pump air system is one of the Smart Home technologies that improve the efficiency of heat supply, create comfortable living conditions and safety through digitalization of the control algorithm for this system.

APA, Harvard, Vancouver, ISO, and other styles

33

Sami, Samir M., and C. Tran. "A Digital Computer Model for Predicting Reactor Coolant Pump Behavior." Nuclear Technology 79, no. 3 (December 1987): 260–73. http://dx.doi.org/10.13182/nt87-a34016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Hsieh, Guan-Chyun, Yan-Pei Wu, Chu-Hsien Lee, and Chang-Huan Liu. "An Adaptive Digital Pump Controller for Phase-Locked Servo Systems." IEEE Transactions on Industrial Electronics IE-34, no. 3 (August 1987): 379–86. http://dx.doi.org/10.1109/tie.1987.350988.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Wang, San-Fu, Tsuen-Shiau Hwang, and Jhen-Ji Wang. "Phase-locked loop design with fast-digital-calibration charge pump." International Journal of Electronics 103, no. 2 (April 24, 2015): 342–54. http://dx.doi.org/10.1080/00207217.2015.1036371.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Wu, Zhuhao, Hongwei Cai, Zheng Ao, Asael Nunez, Hongcheng Liu, Maria Bondesson, Shishang Guo, and Feng Guo. "A Digital Acoustofluidic Pump Powered by Localized Fluid-Substrate Interactions." Analytical Chemistry 91, no. 11 (May 14, 2019): 7097–103. http://dx.doi.org/10.1021/acs.analchem.9b00069.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Ediss, Christopher, and David F. Biggs. "A digital timing system for a small animal respiration pump." Journal of Pharmacological Methods 25, no. 2 (April 1991): 171–77. http://dx.doi.org/10.1016/0160-5402(91)90007-r.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Kosmann, S., O. Trossmann, M.-J. Fikacek, and Dr H. Tielbörger. "Simulating the dynamic behavior of a Triple Screw Pump without CFD." IOP Conference Series: Materials Science and Engineering 1267, no. 1 (November 1, 2022): 012011. http://dx.doi.org/10.1088/1757-899x/1267/1/012011.

Full text

Abstract:

Pressure pulsations in screw pumps lead to noise, vibration and system strain. In order to increase the amount of dissolved and undissolved gas in the fluid while keeping noise, vibration and stress on the system at an acceptable level, the pump behavior must be understood in detail. Physical tests and CFD are common methods in modern pump design. However, both methods are not able to assess numerous design changes and machine integration challenges quickly. The system simulation approach tackles both challenges efficiently and allows to evaluate machine dynamics. Siemens Simcenter Amesim has been used to model a Leistritz Flexcore 45/90 triple screw pump. The model, containing components of a multi-physics library, calculates the movement of the chambers along the spindle package length by having virtual chambers alternately change their volume depending on the spindle rotation. Fluid properties, pressure dependent aeration and inertia effects are considered. The generation and displacement of the chamber volumes cause the suction and discharge of the fluid. The overlay of the single chambers results in the total volume flow of the pump. Internal leakage between the chambers is also considered, turning the model into a realistic digital twin of the screw pump. For the overall model and each individual chamber, the model gives volume flow rates, discharge pressure, pressure pulsation and internal pressure evolution. The air content has a significant influence on the pressure pulsations. To verify the model, measurements of operating points on a real pump have been carried out. Simulated volume flows and pressure pulsation show very good agreement with measurements. This new method for modeling screw pumps dramatically increases the speed of simulating pump behavior and opens the possibility of integrating the models into higher-level systems. The reproduction of dynamic effects and system responses for control tasks is also possible. The existing model can be extended towards further physics like friction modeling or additional system components like an electrical power unit.

APA, Harvard, Vancouver, ISO, and other styles

39

Nahian, Md Rafsan, Mohammad Sakalin Zaman, Md Nurul Islam, and Md Rokunuzzaman. "Development of A Pressure Sensing Module and Flow Control System For A Prototype Pump Test Bed." IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 8, no. 2 (October 31, 2018): 155. http://dx.doi.org/10.22146/ijeis.33855.

Full text

Abstract:

Pump test bed is essential to ensure the proper functioning of a pump. However, a conventional pump test bed has some limitations during measuring the flow properties and variating the pump speed. As a result, a digital pump test bed can be a solution for measuring the flow properties more accurately. This article describes the construction process of a pressure sensing module for a digitalized pump test bed and control of flow by varying the speed of a prototype DC pump. A pressure sensing module and flow control system are constructed in this study to develop a prototype pump test bed as well as change the speed of the centrifugal pump. It is found that by using a piezoelectric pressure sensor in delivery pipe, the pressure sensing error is only 6.3% at the designed speed of pump and can be minimized by calibrating the sensor, fixing the leakage problem and increasing the pressure of flow. A wide variety of pump speeds can also be obtained by applying pulse width modulation principle without stopping the power supply.

APA, Harvard, Vancouver, ISO, and other styles

40

Supiyani, Iip, and Nur Arifin. "IDENTIFIKASI NOMOR RUMAH PADA CITRA DIGITAL MENGGUNAKAN NEURAL NETWORK." METHODIKA: Jurnal Teknik Informatika dan Sistem Informasi 8, no. 1 (March 23, 2022): 18–21. http://dx.doi.org/10.46880/mtk.v8i1.921.

Full text

Abstract:

Fire is an unexpected natural occurrence, fire is caused by human negligence and natural factors, for example, lack of caution in using tools that cause fire, lack of knowledge about the dangers of fire, and lack of discipline. One of the causes of the fire is a gas cylinder leak. A fire disaster is a disaster that often occurs in Indonesia. In general, fires are known when the fire has started to appear and grow and the smoke has started to come out, therefore fires can appear at any time no time In trying to extinguish a fire in the event of fire, a fire alarm system was made using Arduino Uno, MQ-2 gas sensor, fire sensor, buzzer, mini water pump. The working method of this fire alarm system is that the MQ-2 gas sensor detects gas, the buzzer sounds, if the fire sensor detects fire and the MQ-2 gas sensor detects gas, the buzzer sounds and the mini water pump releases water simultaneously.

APA, Harvard, Vancouver, ISO, and other styles

41

Piotrowska-Woroniak, Joanna. "Preliminary Results of the Temperature Distribution Measurements Around the Vertical Ground Heat Exchangers Tubes." Ecological Chemistry and Engineering S 27, no. 4 (December 1, 2020): 509–28. http://dx.doi.org/10.2478/eces-2020-0031.

Full text

Abstract:

Abstract The paper presents the preliminary results of the temperature distribution to a depth of 100 m in the two selected vertical geothermal wells during operation of the heat pump and ground temperature measurement without vertical ground probes work. Research was carried out from the third decade of December to the end of February. The wells are the lower energy source for two heat pumps brine/water type with heating power of 117.2 kW each and 95.9 kW cooling capacity installed in the building of The Faculty of Civil and Environmental Engineering, Bialystok University of Technology in Bialystok. With heat pumps work 52 vertical ground probes to a depth of 100 m each. The article presents the way of making probes equipped with 30 digital temperature sensors to record the temperature distribution in the vertical probes and in the ground and it shows the way of making the test bench using the groundwater wells with vertical probes. The average coefficient of performance COP of the heat pump HP in the months of January and February has been designated.

APA, Harvard, Vancouver, ISO, and other styles

42

Greene, Alexander E. "Sensitive High-Vacuum Monitoring for Philips Electron Microscopes Which Employ ION Getter Pumping." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (August 12, 1990): 188–89. http://dx.doi.org/10.1017/s0424820100179695.

Full text

Abstract:

A very sensitive vacuum monitor may be easily and inexpensively added to any Philips CM or 400 series electron microscope. This digital, auto-ranging volt meter will also operate as an excellent leak detector.The newer Philips computerized transmission electron microscopes have no separate high vacuum gauge and sense high vacuum the same way as it is done on the 400 series instruments. The high vacuum monitoring technique for these microscopes is accomplished by relating the electrical current required by the Ion Getter Pump to the quality of the vacuum (i.e. the better the vacuum, the lower the current). The system for vacuum monitoring measures the voltage across a low value resistor which is placed in series with the Getter Pump and the pump power supply and is usually located near ground or earth potential. The power supply delivers about 7000 V.D.C. to the pump and the voltage across the low value resistor is proportional to the current being drawn by the pump. This voltage is measured, amplified and then compressed by a logarithmic amplifier so one meter scale or a simple digital-to-analog converter can provide a reading equivalent to the high vacuum value. Because of the logarithmic amplifier, small changes cannot be seen; only the general vacuum quality can be monitored.

APA, Harvard, Vancouver, ISO, and other styles

43

Chen, Shao Hua, and Ming Bo Lin. "An All-Digital, Cyclic and Synthesizable TDC in the ADPLL-Based Clocking Digital Systems for Multidomain Power Management." Applied Mechanics and Materials 597 (July 2014): 515–18. http://dx.doi.org/10.4028/www.scientific.net/amm.597.515.

Full text

Abstract:

In this paper, we propose an all-digital, cyclic and synthesizable TDC architecture, which may be used as a core block in ADPLLs to replace the analog block as a phase/frequency detector and a charge pump. Traditional designs of the DVFS scheme for multidomain power management are based on a conventional analog PLL to generate the dynamic voltage and frequency in which the use of a digital TDC eliminates the need for current sources in conventional analog PLLs.

APA, Harvard, Vancouver, ISO, and other styles

44

Zhou, Can, Geling Feng, and Xin Zhao. "An Efficient Calculation Method for Stress and Strain of Concrete Pump Truck Boom Considering Wind Load Variation." Machines 11, no. 2 (January 24, 2023): 161. http://dx.doi.org/10.3390/machines11020161.

Full text

Abstract:

Digital twin is the development trend of concrete pump trucks to realize digitalization and intellectualization. The realization of digital twin requires high calculation efficiency and accuracy of the model. As the concrete pump truck works under the wind load, the wind speed and direction on site change frequently and intensely. However, existing methods, such as the finite element method, have the problems of low computational efficiency, high time complexity, and the update frequency being far lower than the frequency of wind change on site. We propose an efficient calculation model for the stress and strain of the pump truck boom based on the back propagation (BP) neural network. The novelty of this work is that when calculating the stress and strain of the boom, the change of the boom posture and the change of the site wind conditions are considered, and the calculation efficiency can be significantly improved. Compared with the finite element simulation, the fitting and prediction accuracy of the stress and strain are more than 99.7%, which can meet the requirements for real-time calculation of the stress and strain of the boom under different attitudes and wind loads in digital twins.

APA, Harvard, Vancouver, ISO, and other styles

45

R, Kerthika, and Anli Suresh. "Scope of E-Commerce over Petroleum Products with Portable Refuellers in Succeeding Decades." Ushus - Journal of Business Management 18, no. 1 (January 1, 2019): 35–48. http://dx.doi.org/10.12725/ujbm.46.4.

Full text

Abstract:

Petroleum and diesel products can be obtained in specialised refuellers like, „Mini and Mobile Petrol Pumps‟ by placing orders on e-commerce platforms on a pre-booking basis. Mobile applications, home deliveries, online payments are the aid of the digital market. The concept of delivering petrol and diesel products to your doorstep with the help of applications like “My Petrol Pump” and “Book My Petrol” have come into the industry recently. This paper examines the promotion of the home delivery of petroleum products on e-commerce platforms and assesses customer‟s acceptability of the technology.

APA, Harvard, Vancouver, ISO, and other styles

46

Bender, Christopher M., and Shane W. Lani. "Theory of parametric receiving arrays processing utilizing sum and difference frequencies." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A217. http://dx.doi.org/10.1121/10.0011099.

Full text

Abstract:

The majority of highly directive receive arrays obtains their directivity from an often fully populated (lambda/2 spacing) array in one or more dimensions. Digital beamforming allows for steering of these densely populated arrays in multiple directions; however, if there is only one primary direction of interest, a similar highly directive receiver can be generated with just a few elements. Parametric receivers, such as parametric sources, can obtain enhanced directivity via a “virtual aperture” or a region in the medium where nonlinear mixing of a high intensity pump wave and a signal wave interact. For a parametric receiver, the pump element(s) with a frequency, F, and receiver element(s) are separated by a distance, L, and the signals of interest are the sum and difference frequency ( F + /− f) between the pump frequency and an incoming signal frequency, f. The directivity of these parametric receivers are comparable to the end fire response of a line array of similar length, L. This paper will review the highlights of parametric receivers as well as detail the analysis to extend this phenomenon to include the sum and difference frequencies for single element pairing and arrays of pumps and receivers.

APA, Harvard, Vancouver, ISO, and other styles

47

Golesorkhie, Farya, Fuwen Yang, Ljubo Vlacic, and Geoff Tansley. "Field Oriented Control-Based Reduction of the Vibration and Power Consumption of a Blood Pump." Energies 13, no. 15 (July 30, 2020): 3907. http://dx.doi.org/10.3390/en13153907.

Full text

Abstract:

Power quality and energy efficiency are of great importance in motor control. The motor of any medical device needs to have a smooth torque and minimal vibration in order to maximise its energy efficiency and patient comfort. Furthermore, in rotary blood pumps, excessive energy wasted due to vibration is converted into uncontrolled movement of the mechanical parts and thus could reduce the life of the motor-pump. Besides mechanical or hydraulic origin, one of the causes of vibration in any pump is torque ripple resulting from motor phase commutation. In this paper, using relevant equipment, two extreme scenarios were examined for vibration and electrical efficiency comparison due to power quality in a blood pump: one trapezoidal control with a trapezoidal phase current output; the other a field oriented control (FOC) with a non-distorted sinusoidal phase current. The test motor-pump was the Arteriovenous Fistula Eligibility (AFE) System that is used prior to haemodialysis. The trapezoidal technique was implemented utilising the Allegro a4941 fan driver (Allegro Microsystem, 2012), and the FOC technique was implemented using the Texas Instrument digital signal processor (TMS320F28335). The aim was to reduce the energy wasted over vibration, and to achieve smooth operation of the AFE System. Vibration was measured with a one-axis accelerometer; results showed considerably lower vibration due to less current ripple associated with the FOC control as well as lower power consumption.

APA, Harvard, Vancouver, ISO, and other styles

48

Lv, Miao Rong, Mei Li, Zhi Qiang Chen, and Li Wang. "Foundation and Application of Fluid End’s Vibration Model for Drilling Reciprocation Pump." Advanced Materials Research 337 (September 2011): 575–83. http://dx.doi.org/10.4028/www.scientific.net/amr.337.575.

Full text

Abstract:

With the help of digital audio technology, fault diagnosis and quick identification of multi-channel synchronous vibration signals acquired from a triplex pump in well site were achieved. A characteristic model of fluid end’s vibration for this pump was established and further verified by indoor systematic experiments. The source of various vibration components was determined, statistic relationships between these components in different conditions were regressed, and typical sub-signals excited by pump valve movement were also modeled by the use of the basic operation unit segmentation and optimal frequency matching method. These works provide a favorable tool for identifying the pump vibration signals, fault diagnosis, and dynamic modeling of drilling reciprocating pump in future. Such results also have a good contribution to study vibration problems on other types of reciprocating machinery.

APA, Harvard, Vancouver, ISO, and other styles

49

YUE Wen-yan, 岳文艳, 杨晓苹 YANG Xiao-ping, and 杨勇 YANG Yong. "Power Measurement of Ultra-fast Pulse Digital Holography Pump-probe System." ACTA PHOTONICA SINICA 44, no. 12 (2015): 1214001. http://dx.doi.org/10.3788/gzxb20154412.1214001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Byun, Sangjin, and Jae Hoon Shim. "Charge Pump circuit with wide range digital leakage current mismatch compensator." IEICE Electronics Express 7, no. 23 (2010): 1709–13. http://dx.doi.org/10.1587/elex.7.1709.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Digital Pump'

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