A Study on Design of a Breech Mechanism Test-Platform Drive

2010 ◽  
Vol 139-141 ◽  
pp. 1018-1021
Author(s):  
Jia Jun Yao ◽  
Ji Sheng Ma
Keyword(s):  
Failure Rate ◽  
Virtual Prototype ◽  
Prototype Model ◽  
High Failure Rate ◽  
Negative Direction ◽  
Model Based ◽  
Test Platform ◽  
The Impact

The breech mechanism is a very important part of artillery with a high failure rate. It is planned to build a test-platform for the investigation of the breech mechanism. By this test-platform the motion of the breech, while the artillery is shooting, can be simulated as the same. While the artillery is shooting, the energy for the opening and shutting action of the breechblock comes from the impact between the breechblock operating cam and crank, when the breech is returning. But this action of a hugely heavy thing is very difficult to simulate. So the negative direction action is considered, which makes the breechblock operating cam moved to impact the crank. In this paper the virtual prototype model based on ADAMS is used to measure the load etc. of the key-parts of the breech mechanism by simulation experimentations.

scholarly journals Forensic Investigation on The High Failure Rate of Civil Engineering Solid Mechanics Course

2021 ◽  
Vol 17 (2) ◽  
pp. 227
Author(s):  
Siong Wee Lee ◽  
Mohammad Hazizi Jamal ◽  
Mohd Amran Hasbullah ◽  
Mohd Johan Mohamed Ibrahim ◽  
Shahrul Nizam Mohammad ◽  
...  
Keyword(s):  
Failure Rate ◽  
Engineering Students ◽  
Solid Mechanics ◽  
Civil Engineering ◽  
Deep Understanding ◽  
High Failure Rate ◽  
Program Outcomes ◽  
Final Exam ◽  
Survey Results ◽  
The Impact

Abstract: The attainment of program outcomes for Solid Mechanic course offered to the Diploma in Civil Engineering students is evaluated. It was found that most of the students were incapable to demonstrate graduate attributes which applying knowledge of mathematics, natural science and engineering fundamentals and the ability to analyse engineering problems. Therefore, this study investigates the impact of physics and maths scores on the students’ performance of solid mechanics. Analysis of the previous results in physics and maths shows that there is a clear link between students’ fundamentals knowledge and the understanding of solid mechanics. Meanwhile, this study also aims to find out the root causes that led to the high failure rate of solid mechanics. A quantitative method was employed and a total of 180 students responded to the survey. Results of survey indicate that most of the students perceived that they had limited time to gain deep understanding of the course and they could not visualise the complex problems in solid mechanics. Majority of the students admitted that they did not manage to solve all questions during their final exam, and they were indeed not well prepared for it. Hence, the problem of high failure rate is feasible to be solved provided both lecturers and students making efforts in striving the success of this course.      Keywords: Solid mechanics, Program outcomes, Failure rate, Problem solving, Applying knowledge

Principals, Agents, and the Impact of Regulatory Federalism on the Savings-and-Loans Crisis of the 1980s

2003 ◽  
Vol 3 (2) ◽  
pp. 139-157 ◽  
Author(s):  
Julie Laumann ◽  
Paul Teske
Keyword(s):  
Failure Rate ◽  
Regulatory Authority ◽  
Financial Regulation ◽  
Principal Agent ◽  
Federal System ◽  
High Failure Rate ◽  
Savings And Loans ◽  
Large State ◽  
Savings And Loan ◽  
The Impact

Was state financial regulation a major cause of the massive savings and loan (S&L) failures in the late 1980s? This question is critical at a time of continuing devolution of regulatory authority to the states. We employ a database of information on nearly 4,000 S&Ls in this period to understand the factors that led some of them to fail. We find that state-chartered S&Ls failed at higher rates than federally chartered firms, but that the extremely high failure rate of Texas-chartered S&Ls explains all of this difference. The actions of a single, large state can make an enormous difference in the American federal system of regulation. We also find that stock-owned S&Ls failed at a higher rate than mutually owned S&Ls, and that S&Ls chartered in jurisdictions with more autonomous regulatory structures failed at a higher rate. Thus, when the principal-agent relationship in S&L regulation was weakest, S&L failures were most prevalent.

Improved Design and Analysis of Hydraulic Impact Hammer Based on Virtual Prototype Technology

2011 ◽  
Vol 48-49 ◽  
pp. 607-610 ◽  
Author(s):  
Guo Ping Yang ◽  
Bo Chen ◽  
Jun Hao Gao
Keyword(s):  
Control Valve ◽  
Virtual Prototype ◽  
Prototype Model ◽  
Hydraulic Impact ◽  
Directional Control ◽  
Development Cycle ◽  
Virtual Prototype Technology ◽  
Improved Design ◽  
The Impact ◽  
Directional Control Valve

The impact mechanism of the traditional hydraulic hammer is composed of the directional control valve and the main cylinder body. Due to the two parts damaged in different situation at work, the replacement of equipment resulted in unnecessary waste. Based on the design concept of virtual prototype technology, the virtual prototype model of improved hydraulic impactor was established with CATIA software and the directional control valve separated from the main cylinder body, in addition, the kinematics properties of the hydraulic impactor were simulated and analyzed by the dynamic simulation function of CATIA. The virtual prototype technology can reduce the input for the mock-up and Prototype, shorten the development cycle of the products and it is conducive to realize the optimal design or deformation design of products.

scholarly journals A Model-Based Tool for Assessing the Impact of Land Use Change Scenarios on Flood Risk in Small-Scale River Systems—Part 1: Pre-Processing of Scenario Based Flood Characteristics for the Current State of Land Use

Hydrology ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 102
Author(s):  
Frauke Kachholz ◽  
Jens Tränckner
Keyword(s):  
Land Use ◽  
River Flow ◽  
Land Use Changes ◽  
Small Rivers ◽  
Small Scale ◽  
Model Parameters ◽  
Ungauged Catchments ◽  
Model Based ◽  
Current State ◽  
The Impact

Land use changes influence the water balance and often increase surface runoff. The resulting impacts on river flow, water level, and flood should be identified beforehand in the phase of spatial planning. In two consecutive papers, we develop a model-based decision support system for quantifying the hydrological and stream hydraulic impacts of land use changes. Part 1 presents the semi-automatic set-up of physically based hydrological and hydraulic models on the basis of geodata analysis for the current state. Appropriate hydrological model parameters for ungauged catchments are derived by a transfer from a calibrated model. In the regarded lowland river basins, parameters of surface and groundwater inflow turned out to be particularly important. While the calibration delivers very good to good model results for flow (Evol =2.4%, R = 0.84, NSE = 0.84), the model performance is good to satisfactory (Evol = −9.6%, R = 0.88, NSE = 0.59) in a different river system parametrized with the transfer procedure. After transferring the concept to a larger area with various small rivers, the current state is analyzed by running simulations based on statistical rainfall scenarios. Results include watercourse section-specific capacities and excess volumes in case of flooding. The developed approach can relatively quickly generate physically reliable and spatially high-resolution results. Part 2 builds on the data generated in part 1 and presents the subsequent approach to assess hydrologic/hydrodynamic impacts of potential land use changes.

scholarly journals A Reference Framework to Combine Model-Based Design and AR to Improve Social Sustainability

2021 ◽  
Vol 13 (4) ◽  
pp. 2031
Author(s):  
Fabio Grandi ◽  
Riccardo Karim Khamaisi ◽  
Margherita Peruzzini ◽  
Roberto Raffaeli ◽  
Marcello Pellicciari
Keyword(s):  
Positive Impact ◽  
Cost Effective ◽  
Digital Models ◽  
Model Based ◽  
Digital Contents ◽  
Recent Developments ◽  
Virtual Simulations ◽  
Product And Process ◽  
The Impact ◽  
Time Information

Product and process digitalization is pervading numerous areas in the industry to improve quality and reduce costs. In particular, digital models enable virtual simulations to predict product and process performances, as well as to generate digital contents to improve the general workflow. Digital models can also contain additional contents (e.g., model-based design (MBD)) to provide online and on-time information about process operations and management, as well as to support operator activities. The recent developments in augmented reality (AR) offer new specific interfaces to promote the great diffusion of digital contents into industrial processes, thanks to flexible and robust applications, as well as cost-effective devices. However, the impact of AR applications on sustainability is still poorly explored in research. In this direction, this paper proposed an innovative approach to exploit MBD and introduce AR interfaces in the industry to support human intensive processes. Indeed, in those processes, the human contribution is still crucial to guaranteeing the expected product quality (e.g., quality inspection). The paper also analyzed how this new concept can benefit sustainability and define a set of metrics to assess the positive impact on sustainability, focusing on social aspects.

scholarly journals Model-Based Control of Torque and Nitrogen Oxide Emissions in a Euro VI 3.0 L Diesel Engine through Rapid Prototyping

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1107
Author(s):  
Stefano d’Ambrosio ◽  
Roberto Finesso ◽  
Gilles Hardy ◽  
Andrea Manelli ◽  
Alessandro Mancarella ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Rapid Prototyping ◽  
Nitrogen Oxide ◽  
Thermal State ◽  
Pollutant Emissions ◽  
Computational Time ◽  
Nox Emissions ◽  
Model Based ◽  
Brake Mean Effective Pressure ◽  
The Impact

In the present paper, a model-based controller of engine torque and engine-out Nitrogen oxide (NOx) emissions, which was previously developed and tested by means of offline simulations, has been validated on a FPT F1C 3.0 L diesel engine by means of rapid prototyping. With reference to the previous version, a new NOx model has been implemented to improve robustness in terms of NOx prediction. The experimental tests have confirmed the basic functionality of the controller in transient conditions, over different load ramps at fixed engine speeds, over which the average RMSE (Root Mean Square Error) values for the control of NOx emissions were of the order of 55–90 ppm, while the average RMSE values for the control of brake mean effective pressure (BMEP) were of the order of 0.25–0.39 bar. However, the test results also highlighted the need for further improvements, especially concerning the effect of the engine thermal state on the NOx emissions in transient operation. Moreover, several aspects, such as the check of the computational time, the impact of the controller on other pollutant emissions, or on the long-term engine operations, will have to be evaluated in future studies in view of the controller implementation on the engine control unit.

A decision making model based on fuzzy inference to predict the impact of SCOR® indicators on customer perceived value

2020 ◽  
Vol 223 ◽  
pp. 107520
Author(s):  
Lucas Gabriel Zanon ◽  
Rafael Ferro Munhoz Arantes ◽  
Lucas Daniel Del Rosso Calache ◽  
Luiz Cesar Ribeiro Carpinetti
Keyword(s):  
Decision Making ◽  
Fuzzy Inference ◽  
Perceived Value ◽  
Model Based ◽  
Customer Perceived Value ◽  
Decision Making Model ◽  
The Impact

The impact of global change on the hydropower potential of Europe: a model-based analysis

Energy Policy ◽  
2005 ◽  
Vol 33 (7) ◽  
pp. 839-855 ◽  
Author(s):  
Bernhard Lehner ◽  
Gregor Czisch ◽  
Sara Vassolo
Keyword(s):  
Global Change ◽  
Model Based ◽  
Hydropower Potential ◽  
The Impact ◽  
Model Based Analysis

Dynamics Characteristics for Contact Surface of Machine Tool

2014 ◽  
Vol 538 ◽  
pp. 91-94
Author(s):  
Wei Ping Luo
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Contact Surface ◽  
Dynamic Performance ◽  
Virtual Prototype ◽  
Prototype Model ◽  
Ansys Software ◽  
Dynamic Analyses ◽  
Contact Surfaces

A virtual prototype model of Machine Tool has been constructed by using the Pro/E software and the ANSYS software. Considering the effects of contact surfaces, dynamic analyses of Machine Tool are studied. The effects of contact surfaces on the dynamic characteristics of machine tool are studied. So that the purpose predicting and evaluating synthetically the machine tool dynamic performance without a physical sample can be achieved.

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