scholarly journals Recording the braking process of a catastrophic flight data recorder protection cassette during a crash test

2019 ◽  
Vol 20 (1-2) ◽  
pp. 66-73
Author(s):  
Zbigniew Jakielaszek ◽  
Andrzej Panas ◽  
Mirosław Nowakowski ◽  
Maciej Białecki ◽  
Marcin Bryl ◽  
...  
Keyword(s):  
Crash Test ◽  
Test Procedures ◽  
Transient Phenomena ◽  
Flight Data ◽  
Test Probe ◽  
Normative Requirements ◽  
Institute Of Technology ◽  
Braking Process ◽  
Rapid Deceleration ◽  
The Impact

The article describes methods for recording the course of a test probe crashing into an obstacle in the form of a sand bed and the consequent rapid deceleration process by the braking object. The tested probe is adapted for placing a catastrophic flight data recorder protection cassette inside of it. The tests were conducted in order to confirm the resistance of the protection cassette to a g-load of 3400g acting on the cassette for ca. 6.5 ms, as per the guidelines of the standards: European EuroCAE ED-112 and Polish NO-16-A200. The probe was accelerated to a required velocity using a DPZ-250 pneumatic can-non, owned by the Institute of Aviation. The controlled braking pro-cess was obtained thanks to a sand bed located within the braking station, which was designed and constructed at Air Force Institute of Technology (AFIT). The course of each crash test, that is, the flight and the process of a test probe crashing into the sand was recorded by a camera for recording fast transient phenomena. Conducting the crucial tests involved installing an overload recording system inside the test probe, which directly records and saves the overloads associated with collisions. The objective of the first test stage was to confirm the correctness of the adopted methodology and to develop test procedures used in further experiments. The essential tests involved in-stalling a catastrophic flight data recorder electronics package inside the test probe in order to confirm satisfying the requirement in terms of overload. The executed tests confirmed reaching the parameters of the experiment, which satisfy the normative requirements of the test conditions. The checks of the tested catastrophic flight data recorder elements proved its resistance to a g-load of 3400 g. The applied g-load re-cording methods enabled the inspectors to confirm reaching the required value and the nature of changes of the hazards, the test probe was subjected to during the impact tests.

scholarly journals Full-Scale Train-to-Train Impact Test and Multi-Body Dynamic Simulation Analysis

Machines ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 297
Author(s):  
Hui Zhao ◽  
Ping Xu ◽  
Benhuai Li ◽  
Shuguang Yao ◽  
Chengxing Yang ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Impact Velocity ◽  
High Speed ◽  
Simulation Analysis ◽  
Simulation Software ◽  
Crash Test ◽  
Vehicle Mass ◽  
Polynomial Response Surface ◽  
Braking Process ◽  
The Impact

When a train crashes with another train at a high speed, it will lead to significant financial losses and societal costs. Carrying out a train-to-train crash test is of great significance to reproducing the collision response and assessing the safety performance of trains. To ensure the testability and safety of the train collision test, it is necessary to analyze and predict the dynamic behavior of the train in the whole test process before the test. This paper presents a study of the dynamic response of the train in each test stage during the train-to-train crash test under different conditions. In this study, a 1D/3D co-simulation dynamics model of the train under various load conditions of driving, collision and braking has been established based on the MotionView dynamic simulation software. The accuracy of the numerical model is verified by comparing with a five-vehicle formations train-to-train crash test data. Sensitivities of several key influencing parameters, such as the train formation, impact velocity and the vehicle mass, are reported in detail as well. The results show that the increase in the impact velocity has an increasing effect on the movement displacement of the vehicle in each process. However, increasing the vehicle mass and train formation has almost no effect on the running displacement of the braking process of the traction train. By sorting the variables in descending order of sensitivity, it can be obtained that impact speed > train formation > vehicle mass. The polynomial response surface method (PRSM) is used to construct the fitting relationship between the parameters and the responses.

scholarly journals Simulation of Energy Absorption Performance of the Couplers in Urban Railway Vehicles during a Heavy Collision

Machines ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 91
Author(s):  
Sunghyun Lim ◽  
Yong-hyeon Ji ◽  
Yeong-il Park
Keyword(s):  
Reaction Force ◽  
Crash Test ◽  
Railway Vehicle ◽  
Buffer System ◽  
Railway Vehicles ◽  
Hydraulic Shock Absorber ◽  
Coupling Buffer ◽  
Absorption Performance ◽  
Different Characteristics ◽  
The Impact

Railway vehicles are generally operated by connecting several vehicles in a row. Mechanisms connecting railway vehicles must also absorb front and rear shock loads that occur during a train’s operation. To minimize damage, rail car couplers are equipped with a buffer system that absorbs the impact of energy. It is difficult to perform a crash test and evaluate performance by applying a buffer to an actual railway vehicle. In this study, a simulation technique using a mathematical buffer model was introduced to overcome these difficulties. For this, a model of each element of the buffer was built based on the experimental data for each element of the coupling buffer system and a collision simulation program was developed. The buffering characteristics of a 10-car train colliding at 25 km/h were analyzed using a developed simulator. The results of the heavy collision simulation showed that the rubber buffer was directly connected to the hydraulic shock absorber in a solid contact state, and displacement of the hydraulic buffer hardly occurred despite the increase in reaction force due to the high impact speed. Since the impact force is concentrated on the vehicle to which the collision is applied, it may be appropriate to apply a deformation tube with different characteristics depending on the vehicle location.

On the Impact Behavior of a Material With a Yield Point

1949 ◽  
Vol 16 (1) ◽  
pp. 39-52
Author(s):  
Merit P. White
Keyword(s):  
Yield Stress ◽  
Yield Point ◽  
Impact Behavior ◽  
Longitudinal Impact ◽  
Stress Strain ◽  
California Institute Of Technology ◽  
Static Yield ◽  
Institute Of Technology ◽  
Probable Nature ◽  
The Impact

Abstract An analysis of longitudinal impact tests that were made by Drs. D. S. Clark and P. E. Duwez at the California Institute of Technology on an iron and a steel with definite yield points is described. From this analysis is deduced the probable nature of the dynamic stress-strain relations for such materials. These appear to differ greatly from the static stress-strain relations, unlike the case for materials without yield points. As pointed out by Duwez and Clark, the upper yield stress for undeformed material is several times as great under impact as the static yield stress. The present analysis indicates that under impact, the material with a definite yield point is made harder at a given deformation, and ruptures at a higher (engineering) stress and smaller strain than when loaded statically. The critical impact velocity, defined as that at which nearly instantaneous failure occurs in tension, is discussed, and the factors upon which it depends are given.

scholarly journals The Impact of Covid-19 Pandemic on Students’ Learning Outcome in Higher Education

2021 ◽  
Vol 13 (2) ◽  
pp. 1425-1431
Author(s):  
Andi Rahman
Keyword(s):  
Higher Education ◽  
Learning Outcomes ◽  
Online Teaching ◽  
Teaching And Learning ◽  
Human Life ◽  
Cross Sectional ◽  
Study Results ◽  
Institute Of Technology ◽  
The Impact ◽  
Academic Year

The current Covid-19 pandemic has had many effects on human life globally, including the implementation of education. This study aimed to obtain the impact of the Covid-19 pandemic on learning outcomes in higher education. The research method used is a cross-sectional study. The data were taken from the test results at the end of the lecture, observations, and interviews. The research was conducted at the University of Muhammadiyah Lampung, IPDN Jatinangor Campus, and the Ahmad Dahlan Institute of Technology and Business, with 120 students participating. The data analysis technique used the percentage technique and cross-tabulation. The study results concluded that student learning outcomes decreased in the 2020-2021 academic year compared to the 2019-2020 academic year. The decline in learning outcomes includes knowledge, skills, and psychology. This finding has implications for the understanding of education personnel regarding online teaching and learning design during the Covid-19 pandemic.

scholarly journals Teaching Midwifery Face-to-Face or Via the Screen: The Impact of Flexible Delivery of Teaching on Student Engagement

2021 ◽  
Author(s):  
◽  
Tania Dawn Milne
Keyword(s):  
New Zealand ◽  
Student Engagement ◽  
Video Conferencing ◽  
Face To Face ◽  
New Curriculum ◽  
On Line ◽  
Flexible Delivery ◽  
Institute Of Technology ◽  
Quality Learning ◽  
The Impact

<p>The aim of this research was to describe how undergraduate midwifery students’ engagement with learning is impacted when they have teaching delivered by different methods of instruction. It asks the question: does flexible delivery of teaching impact on their ability to engage in their learning? This research describes the impact of different modes of flexible delivery of teaching within a new curriculum on students in a pre-registration midwifery undergraduate programme at Waikato Institute of Technology (Wintec), New Zealand. This new curriculum commenced in 2010 as a response to legislative and industry driven changes to midwifery education in New Zealand. The research used an on-line survey to ask students enrolled in years one and two of the programme and those who had exited the programme during the same timeframe, A range of questions about their learning experiences. Surveys were sent to 104 enrolled students and 15 students that had exited the BMid programme. Fifty two (50%) responses were received from the enrolled students and three (20%) from those that had exited the programme. There were three key findings of this research. Firstly the participants identified differences with their sense of belonging amongst their peers, tutors and the administration team outside of their regional learning hubs. The second key and unsurprising finding was that respondents across the board preferred face-to-face sessions to video conferencing sessions and thirdly that the demographic profile of the respondents from the regional learning hubs was different to those attending from the Hamilton city hub. The implications of these key findings are; · For tertiary institutions to acknowledge and consider the links between high quality learning, student engagement and outcomes. · To support the need for continuing training and education for both faculty and students with regards to flexible delivery of teaching and to provide professional development and relevant technology to support more interactive forms of learning if delivered via video conferencing or by online activities. · To further research the needs of Māori students and those who have exited the programme in order to discover what would need to change in order for them to continue with their studies.</p>

A Sub-System Test Methodology for Simulating EEVC Side Impact

2000 ◽  
Author(s):  
Krishnakanth Aekbote ◽  
Srinivasan Sundararajan ◽  
Joseph A. Prater ◽  
Joe E. Abramczyk
Keyword(s):  
Full Scale ◽  
Test Method ◽  
Side Impact ◽  
Vehicle Body ◽  
Crash Test ◽  
Vehicle Performance ◽  
Test Methodology ◽  
Supporting Frame ◽  
The Impact ◽  
Crash Tests

Abstract A sled based test method for simulating full-scale EEVC (European) side impact crash test is described in this paper. Both the dummy (Eurosid-1) and vehicle structural responses were simulated, and validated with the full-scale crash tests. The effect of various structural configurations such as foam filled structures, material changes, rocker and b-pillar reinforcements, advanced door design concepts, on vehicle performance can be evaluated using this methodology at the early stages of design. In this approach, an actual EEVC honeycomb barrier and a vehicle body-in-white with doors were used. The under-hood components (engine, transmission, radiator, etc.), tires, and the front/rear suspensions were not included in the vehicle assembly, but they were replaced by lumped masses (by adding weight) in the front and rear of the vehicle, to maintain the overall vehicle weight. The vehicle was mounted on the sled by means of a supporting frame at the front/rear suspension attachments, and was allowed to translate in the impact direction only. At the start of the simulation, an instrumented Eurosid-1 dummy was seated inside the vehicle, while maintaining the same h-point location, chest angle, and door-to-dummy lateral distance, as in a full-scale crash test. The EEVC honeycomb barrier was mounted on another sled, and care was taken to ensure that weight, and the relative impact location to the vehicle, was maintained the same as in full-scale crash test. The Barrier impacted the stationary vehicle at an initial velocity of approx. 30 mph. The MDB and the vehicle were allowed to slide for about 20 inches from contact, before they were brought to rest. Accelerometers were mounted on the door inner sheet metal and b-pillar, rocker, seat cross-members, seats, and non-struck side rocker. The Barrier was instrumented with six load cells to monitor the impact force at different sections, and an accelerometer for deceleration measurement. The dummy, vehicle, and the Barrier responses showed good correlation when compared to full-scale crash tests. The test methodology was also used in assessing the performance/crashworthiness of various sub-system designs of the side structure (A-pillar, B-pillar, door, rocker, seat cross-members, etc.) of a passenger car. This paper concerns itself with the development and validation of the test methodology only, as the study of various side structure designs and evaluations are beyond the scope of this paper.

"Effectiveness of Robotics Intervention in Education for Children and Healthcare of Elderly People: A Systematic Review and Meta-Analysis Protocol" (Preprint)

2021 ◽  
Author(s):  
Ramesh Athe ◽  
Vidushi Varma ◽  
Shivendra Pandey ◽  
Ayush Gupta ◽  
Sravanthi Chaitanya
Keyword(s):  
Systematic Review ◽  
Elder Care ◽  
Meta Analysis ◽  
Educational Institution ◽  
Humanoid Robots ◽  
Outcome Data ◽  
Population Characteristics ◽  
Cochrane Library ◽  
Test Procedures ◽  
The Impact

UNSTRUCTURED A systematic review will be carried out to examine the use of robots in early childhood and lower-level education, elder care, and learning/teaching in an educational institution(s). Present study to critically review the currently available evidence of studies carried out and look at the impact of humanoid robots on children, elder care, and education. Four major factors will be considered – the type of studies carried on the influence of robots on children’s behavior and growth, elder care, the understanding of stakeholders (parents, children, and educators) on educational robots, and finally, the reactions of the children and elderly population on robot design or presence. This review will reveal the validating of their use of robots including experimental and non-experimental trials. The steps in this process will be conducted according to the PRISMA-P (Preferred Reporting Items for Systematic reviews and Meta-Analysis Protocols) guidelines for meta-analysis. A comprehensive review of the literature search from Medline, the Cochrane Library, Scopus, PubMed, ProQuest, and secondary references will be performed from inception to April 15, 2021. Analyses will be done to calculate summary estimates on awareness indicators and test procedures by using fixed/random-effects models. Meta-regression and covariate analyses will be performed to explore the influence of confounders on the net pooled effect. Titles and abstracts will be assessed by three independent reviewers for potential relevance. Using study-specific data forms, predetermined data will be extracted for each study. Data extracted will include: 1) study characteristics, 2) study design, 3) population characteristics, 4) details of the comparison group(s), 5) awareness indicators, 6) skills development, 7) progressive, 8) outcome data, and 9) Study year. Other classifications to be considered are a type of skill and specific age.

The failure of non‐binding declarations to achieve university sustainability

2007 ◽  
Vol 8 (3) ◽  
pp. 301-316 ◽  
Author(s):  
S.A. Bekessy ◽  
K. Samson ◽  
R.E. Clarkson
Keyword(s):  
Best Practice ◽  
Small Scale ◽  
Structured Interviews ◽  
Pilot Studies ◽  
Content Type ◽  
Institute Of Technology ◽  
University Leaders ◽  
The University ◽  
The Impact ◽  
Insight Into

PurposeThis paper aims to assess the impact and value of non‐binding agreements or declarations in achieving sustainability in universities.Design/methodology/approachA case study of Royal Melbourne Institute of Technology (RMIT) University is presented, analysing the reasons for lack of progress towards sustainability and evaluating best ways forward. Using a timeline and analysis of historical records for the 12 years since RMIT first engaged in the sustainability agenda, major trends in the process of implementing policies are identified. Secondly, 15 semi‐structured interviews with university leaders and key sustainability stakeholders from across the university are analysed to provide insight into how and why the university has failed to achieve sustainability.FindingsNew implications for successfully achieving sustainability arise from these findings. Accountability is a key issue, as RMIT appears to reap benefits from being signatory to declarations without achieving genuine progress. To ensure that declarations are more than simply greenwash, universities must open themselves up to scrutiny of progress to determine whether commitments have been honoured.Practical implicationsRelying on small‐scale “club” activities establishing demonstrations and raising awareness is unlikely to lead to permanent change. The evidence of RMIT's engagement with sustainability shows that, for example, even when successful pilot studies are conducted, these initiatives may do little to affect the mainstream practices of a university unless certain conditions exist. Furthermore, given the on‐paper commitments institutions have made, and the role of the university in society, small‐scale and gradual changes in university practice are a far from adequate response to the urgent sustainability imperative.Originality/valueThe initial engagement of RMIT University with the sustainability agenda 12 years ago marked it as a world leader in sustainability best‐practice. Analysing how and why such a disappointing lack of action has resulted from such promising beginnings provides insight into future directions for implementing sustainability in universities. The paper argues that considering the key responsibility of universities in leading the sustainability agenda, a more systemic and serious response is required.

scholarly journals Adaptive lighting comfort in the classrooms of educational building and student hostel rooms

2020 ◽  
Vol 170 ◽  
pp. 01012
Author(s):  
Subbarao Yarramsetty ◽  
Nikhil Siva Deka ◽  
MVN Siva Kumar
Keyword(s):  
Classroom Environment ◽  
Indoor Environment ◽  
Critical Role ◽  
Comfort Level ◽  
P Value ◽  
Lighting Intensity ◽  
Institute Of Technology ◽  
Teaching Learning ◽  
Indoor Lighting ◽  
The Impact

The comfort level of occupants inside a building depends on various indoor environment factors like thermal comfort, indoor air quality, and indoor lighting quality. According to studies done on indoor environment quality of buildings, lighting plays a very critical role in determining the occupants comfort level. A proper indoor lighting is very important especially in the classrooms of an educational building as well as in student hostel rooms as it can be said as a vital element, controlling the psychology and comfort of the students and hence a deciding factor in the teaching-learning process. The lighting intensity and its distribution depends on the location of the interior partition as well as the design strategy of the exterior envelop. So, in order to obtain the most occupant friendly results, the impact of various strategies adopted should be evaluated in the early design period itself. This paper adopts a questionnaire-based field surveys which is done in the classrooms of National Institute of Technology Warangal and also in the hostel rooms of 1.8K Ultra Mega hostel of this institute. The main objective of this study includes. 1) To assess the indoor lighting comfort in the classrooms and hostel rooms of National Institute of Technology Warangal through a questionnaire-based lighting comfort study. 2) To identify preferences of subjects in the classroom environment with respect to lighting comfort and 3) To identify the comfort range of lighting intensity inside the classrooms and hostel rooms. SPSS software is used analyse the reliability of survey responses by finding the P value.

scholarly journals Modeling Head-On Collisions: The Problem of Identifying Collision Parameters

2020 ◽  
Vol 10 (18) ◽  
pp. 6212
Author(s):  
Piotr Aleksandrowicz
Keyword(s):  
Model Development ◽  
Crash Test ◽  
Legal Proceedings ◽  
Car Body ◽  
Impact Simulation ◽  
Default Data ◽  
Multi Body ◽  
Crash Model ◽  
The Impact ◽  
Legal Consequences

The analyses performed by the experts are crucial for the settlement of court disputes, and they have legal consequences for the parties to legal proceedings. The reliability of the simulation result is crucial. First, in article, an impact simulation was performed with the use of the program default data. Next, the impact parameters were identified from a crash test, and a simulation was presented. Due to the difficulties in obtaining the data identified, the experts usually take advantage of simplifications using only default data provided by the simulation program. This article includes the original conclusions on specific reasons of simplified collision modeling in Multi Body Systems (MBS) programs and provides specific directions of development of the V-SIM4 program used in the study to enhance the models applied. This manuscript indicates a direction for crash model development in MBS programs to consider a varied 3D body space zones stiffness related to the structure of the car body and the internal car elements instead of modeling the car body as a solid with an average stiffness. Such an approach would provide an alternative to Finite Element Method (FEM) convention modeling.

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