The Calculation and Simulate Research of the Natural Frequency of Liquid Flow on Piping Networks of Multi-Pulse Sources

The pressure resonance problem impelled by hydraulic pulsation power in piping networks is studied in this thesis. Through theoretical analyzing and computer simulating to the flow variation of multi-pulse sources accumulation, two concepts: the variable initial angle by equal probability and flow pulsation rare, are introduced. Some useful conclusions are also obtained. Most of piping networks vibration in engineering is aroused by the medium pressure pulsation. Destructive violent vibration is set off by the simulation of pressure pulsation when resonant occurred. In order to reduce the vibration, it is important to restrain pressure pulsation and to avoid the resonance areas determined by piping networks construction. On the basis of the optimized approximate model to meet the need of the practical engineering and fluidic network theory, this thesis is mainly concerned with the natural frequency of internal liquid vibration in pipelines. In this thesis a no-damping piping mathematics model as well as the transfer matrix method is employed, and the computer simulation is used in theoretical researching. The simulation software of pressure fluctuation for the complex fluidic transmission systems is developed. The effects of every structure parameters of simulated hydraulic pipelines on the pressure pulsation performance are analyzed in details by using the software which makes us modify some structure parameters efficiently so as to optimize structure, evade resonant, reduce the amplitude of pressure pulsation and avoid fluid resonance. The experiments verify the conclusion of the computer simulation and show that the software is easy to be widely used in the dynamic optimum design of fluid transmission systems.

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Analysis and Optimization of Two Film-Coated Tablet Production Processes by Computer Simulation: A Case Study

Processes ◽

10.3390/pr9010067 ◽

2020 ◽

Vol 9 (1) ◽

pp. 67

Author(s):

Stefanie Hering ◽

Nico Schäuble ◽

Thomas M. Buck ◽

Brigitta Loretz ◽

Thomas Rillmann ◽

...

Keyword(s):

Computer Simulation ◽

Model Building ◽

Discrete Event ◽

Simulation Software ◽

Labor Costs ◽

Event Simulation ◽

Processing Times ◽

Production Processes ◽

Coated Tablet ◽

Pharmaceutical Production

Increasing regulatory demands are forcing the pharmaceutical industry to invest its available resources carefully. This is especially challenging for small- and middle-sized companies. Computer simulation software like FlexSim allows one to explore variations in production processes without the need to interrupt the running process. Here, we applied a discrete-event simulation to two approved film-coated tablet production processes. The simulations were performed with FlexSim (FlexSim Deutschland—Ingenieurbüro für Simulationsdienstleistung Ralf Gruber, Kirchlengern, Germany). Process visualization was done using Cmap Tools (Florida Institute for Human and Machine Cognition, Pensacola, FL, USA), and statistical analysis used MiniTab® (Minitab GmbH, Munich, Germany). The most critical elements identified during model building were the model logic, operating schedule, and processing times. These factors were graphically and statistically verified. To optimize the utilization of employees, three different shift systems were simulated, thereby revealing the advantages of two-shift and one-and-a-half-shift systems compared to a one-shift system. Without the need to interrupt any currently running production processes, we found that changing the shift system could save 50–53% of the campaign duration and 9–14% of the labor costs. In summary, we demonstrated that FlexSim, which is mainly used in logistics, can also be advantageously implemented for modeling and optimizing pharmaceutical production processes.

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Study on a Novel MEMS High G Acceleration Sensor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.490-495.499 ◽

2012 ◽

Vol 490-495 ◽

pp. 499-503

Author(s):

Ping Li ◽

Yun Bo Shi ◽

Jun Liu ◽

Shi Qiao Gao

Keyword(s):

Resonant Frequency ◽

Natural Frequency ◽

Impact Load ◽

Hopkinson Bar ◽

Experimental Results ◽

Structure Parameters ◽

Acceleration Sensor ◽

Piezoresistive Effect ◽

Sensor Structure ◽

The Impact

This paper presents a novel MEMS high g acceleration sensor based on piezoresistive effect. For the designed sensor structure, the formula of stress, natural frequency and damping was derived in theory, and the resonant frequency can up to 500kHz. After the structure parameters were designed, the sensor was fabricated by the standard processing technology, and the sensitivity was tested by Hopkinson bar. According to the experimental results, the sensitivity of the high g acceleration sensor is 0.125μV/g at the impact load of 164,002g.

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Accuracy of Computer Simulation to Predict Patient Flow during Mass-Casualty Incidents

Prehospital and Disaster Medicine ◽

10.1017/s1049023x00006002 ◽

2008 ◽

Vol 23 (4) ◽

pp. 354-360 ◽

Cited By ~ 5

Author(s):

Jeffrey M. Franc-Law ◽

Micheal J. Bullard ◽

F. Della Corte

Keyword(s):

Emergency Department ◽

Computer Simulation ◽

Patient Care ◽

Patient Flow ◽

Emergency Department Patient ◽

Simulation Software ◽

Simulated Patients ◽

Disaster Plan ◽

Data Set ◽

Patient Database

AbstractIntroduction:Although most hospitals have an emergency department disas- ter plan, most never have been implemented in a true disaster or been tested objectively. Computer simulation may be a useful tool to predict emergency department patient flow during a disaster.Purpose:The aim of this study was to compare the accuracy of a computer simulation in predicting emergency department patient flow during a masscasualty incident with that of a real-time, virtual, live exercise.Methods:History, physical examination findings, and laboratory results for 136 simulated patients were extracted from the disastermed.ca patient database as used as input into a computer simulation designed to represent the emergency department at the University of Alberta Hospital.The computer simulation was developed using a commercially available simulation software platform (2005, SimProcess, CACI Products, San Diego CA). Patient flow parameters were compared to a previous virtual, live exercise using the same data set.Results:Although results between the computer simulation and the live exercise appear similar, they differ statistically with respect to many patient benchmarks. There was a marked difference between the triage codes assigned during the live exercise and those from the patient database; however, this alone did not account for the differences between the patient groups. It is likely that novel approaches to patient care developed by the live exercise group, which are difficult to model by computer software, contributed to differences between the groups. Computer simulation was useful, however, in predicting how small changes to emergency department structure, such as adding staff or patient care areas, can influence patient flow.Conclusions:Computer simulation is helpful in defining the effects of changes to a hospital disaster plan. However, it cannot fully replace participant exercises. Rather, computer simulation and live exercises are complementary, and both may be useful for disaster plan evaluation.

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Dynamic Computer Simulation Software for Capillary Electrophoresis

Handbook of Capillary and Microchip Electrophoresis and Associated Microtechniques ◽

10.1201/9781420004953-23 ◽

2007 ◽

pp. 537-566

Keyword(s):

Computer Simulation ◽

Capillary Electrophoresis ◽

Simulation Software ◽

Dynamic Computer Simulation

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Enterprise Inventory Management and Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.933.874 ◽

2014 ◽

Vol 933 ◽

pp. 874-878

Author(s):

Yun Rui Wang

Keyword(s):

Computer Simulation ◽

Supply Chain ◽

Inventory Management ◽

Simulation Software ◽

Total Cost ◽

The Third ◽

Inventory Strategy ◽

One Year ◽

The Cost ◽

Operation Cost

Inventory is an important link in supply chain, according to characteristics and objectives of inventory control, the reasonable safety inventory, order point, the highest inventory and inventory strategy were determined based on historical sales data. Using Witness simulation software, the optimal strategy was selected from nine inventory strategies by running simulation model for one year. If goods shortage was allowing, the seventh schemes (72000,158100) was better ,the minimum total cost was 888158 yuan ; considering allowing a small amount of shortage, the cost of eighth schemes ( 82000,158100) was least of 1095167; the third scenarios (92000,138100) was selected if without shortage, and the minimum total cost was 1254909 yuan. This shows, the application of computer simulation to assist in the management of inventory is scientific and feasible, it can help enterprises to save the order and operation cost.

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OPNET-Based Computer Simulation of MPLS VPN Security Solutions

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.40-41.361 ◽

2010 ◽

Vol 40-41 ◽

pp. 361-365

Author(s):

Ya Qin Fan ◽

Hao Fan ◽

Chao Sun

Keyword(s):

Computer Simulation ◽

Information Disclosure ◽

Reference Value ◽

Simulation System ◽

Simulation Software ◽

Software Simulation ◽

The Public ◽

Backbone Network ◽

Mpls Vpn ◽

Simulation Results

This paper features of IPSec and MPLS technologies, proposes a suitable MPLS VPN security solutions. The program to solve the VPN using MPLS backbone network in the public transport there is a second layer of information can not automatically encrypt, or connect easily made because of errors due to the interruption of information disclosure and other issues. To verify the proposed security program, the actual MPLS VPN can be simplified, abstracestablishing a simulation system MPLS VPN, and using OPNET simulation software simulation, simulation results of VPN officers practical reference value.

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