Investigation on the Effect of Liquid Hammer Geometry to the Pressure Distribution of Innovative Hybrid Impact Hydroforming

2014 ◽  
Vol 941-944 ◽  
pp. 1843-1849 ◽  
Author(s):  
Murhaf Marai ◽  
Li Hui Lang ◽  
Shao Hua Wang ◽  
Li Jin Lin ◽  
Chun Lei Yang ◽  
...  
Keyword(s):  
Loading Condition ◽  
Experimental Approach ◽  
High Energy ◽  
Geometrical Shape ◽  
Wave Loading ◽  
Forming Process ◽  
Short Time ◽  
The Impact ◽  
Complex Parts

The innovative hybrid impact hydroforming (IHF) technology is a kind of high energy forming technique which can be used for forming complex parts with small features, such as convex tables, bars etc. which are widely employed in automotive and aircraft industries. The impact hydroforming technology means the most features are formed by hydroforming and the small features are rapidly reshaped by high intensity impact energy in a very short time after the traditional hydroforming. The impact pressure rises to the peak in 10ms which belongs to dynamic loading. The present work investigates IHF using a numerical /experimental approach. Finite element simulations using MSC.Patran were carried out changing the geometrical shape of liquid hammer.. Using this shock wave loading condition we did forming experiments. During forming process, stress distribution in the blank is comparatively better as compared with traditional methods so possibility of fracture is reduced. Inertia is also an important factor which affects control quality. Therefore, the research is very useful for improving forming quality of complicated products. It will be widely applied in automotive and aircraft industries.

Candidate Confidence and Electoral Appeal: An Experimental Study of the Effect of Nonverbal Confidence on Voter Evaluations

2014 ◽  
Vol 3 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Delia Dumitrescu ◽  
Elisabeth Gidengil ◽  
Dietlind Stolle
Keyword(s):  
Experimental Study ◽  
Nonverbal Communication ◽  
Experimental Approach ◽  
Campaign Messages ◽  
The Impact

The nonverbal display of confidence is strongly associated with leadership and power. However, its importance for the persuasiveness of campaign messages has not been explored. How important is showing confidence for a political candidate’s ratings? How does confidence condition the effect of the quality of a candidate’s arguments? This article addresses these questions using an innovative experimental approach that makes it possible to better isolate the impact of the candidate’s nonverbal confidence and the quality of his message. While both of these aspects influence voters’ perceptions of the candidate’s electability and qualifications, the nonverbal dimension matters more when it comes to electability. This research contributes to the study of nonverbal communication in elections by expanding the focus of inquiry beyond the effect of pure emotions (happiness or anger) and facial traits.

scholarly journals A systemic approach to the research of personnel in agriculture of the region

2021 ◽  
Vol 37 ◽  
pp. 00032
Author(s):  
Elena A. Chulkova ◽  
Lyaysana I. Rakhmatullina
Keyword(s):  
Food Security ◽  
Econometric Modeling ◽  
Industrial Complex ◽  
Target Indicator ◽  
Methodical Approach ◽  
The Difference ◽  
Innovative Economy ◽  
Short Time ◽  
The Impact

Development of an innovative economy gives rise to the need to form a highly competent workforce capable of creating and implementing innovations in a short time. This also applies to agriculture as a sector of the economy that ensures the food security of the regions and the country as a whole. The level and quality of the labor force is considered as the most important resource in the activities and development of the agro-industrial complex. A methodical approach to a systematic study of the use of staffing in agriculture in the region is proposed, the difference of which is the use of econometric modeling to assess the impact on the target indicator of the components of staff by areas of activity and level of qualifications. The application of the approach is shown on the example of the sector of agricultural organizations of municipal districts of the Orenburg region.

scholarly journals The Impact of Stress Stability on Job Satisfaction and the Quality of Human Capital

2017 ◽  
Vol 6 (5) ◽  
pp. 333 ◽  
Author(s):  
Irina A. Rudaleva ◽  
Askar N. Mustafin
Keyword(s):  
Job Satisfaction ◽  
Psychological State ◽  
Negative Consequences ◽  
Professional Stress ◽  
Time Period ◽  
Bank Employees ◽  
Short Time ◽  
The Impact ◽  
Main Factor

<p>Long professional stress has a significant impact on the psychological state of employees that inevitably affects the activities of any organization. Therefore, at present, more and more attention is being paid to minimize the negative consequences of stressful staff conditions, with the help of specific procedures of stress management. In this paper, we investigated the impact of stress, the types of stress-resistance of staff individual, and the influence of stress on the degree of job satisfaction of bank employees. The study concludes that the following factors affect the level of job satisfaction of bank employees: wage satisfaction, the level of stress at the workplace, and the relationships in the team. The main factor of the bank employees stress is a large amount of work and a short time period for doing the work. </p>

scholarly journals Skill and Skill Prediction of Cloud-Track Advection-Only Forecasting under a Cumulus-Dominated Regime

2017 ◽  
Vol 56 (3) ◽  
pp. 651-665
Author(s):  
Vivek Srikrishnan ◽  
George S. Young ◽  
Jeffrey R. S. Brownson
Keyword(s):  
Radiative Transfer ◽  
Power Systems ◽  
Lead Time ◽  
Solar Power ◽  
Power Production ◽  
Energy Integration ◽  
Taylor’S Hypothesis ◽  
Short Time ◽  
The Impact

AbstractThe intermittency of solar power production is dependent on the evolution and advection of the nearby cloud field. A key problem related to solar energy integration is the improvement of 1-h-ahead forecasts to reduce the impact of intermittency on power systems operations. Many solar forecasts explicitly or implicitly assume Taylor’s hypothesis. While such advection-only forecasts can be presumed to be valid across sufficiently short time scales, it is not clear how rapidly the skill of such a forecast decays with increased lead time. As the goal is to improve the quality of 1-h-ahead forecasts, this work focuses on quantifying the skill of cloud-track wind-based cumulus-dominated cloud field forecasts with respect to lead time. No explicit connection is drawn to the quality of solar forecasts because of the importance of separating two potential sources of error: cloud field forecasting and radiative transfer estimation. It is found that the cumulus field forecast skill begins to asymptotically approach a minimum at lead times of beyond 30 min, suggesting that advection-only forecasts in a cumulus-dominated environment should not be relied upon for 1-h-ahead point forecasts used by radiative transfer methods to estimate solar power production. A first attempt at forming a probabilistic forecast that can quantify this increasing uncertainty when using advection-only methods is presented.

Investigation on the Punching Quality of Hybrid Impact Hydroforming

2014 ◽  
Vol 602-605 ◽  
pp. 520-523 ◽  
Author(s):  
Shao Hua Wang ◽  
Li Hui Lang ◽  
Li Jing Lin
Keyword(s):  
Shock Wave ◽  
High Energy ◽  
Stress Effects ◽  
Depth Direction ◽  
Forming Technology ◽  
Element Simulation ◽  
Shock Wave Generation ◽  
Width Direction ◽  
Short Time

High energy forming technology has been widely applied in the aircraft and automobile area which means high energy works in very short time, no more than 1s. The innovative hybrid impact hydro-forming (IHF) technology is a kind of high energy forming technique. It combines hydroforming and high energy forming, which first use hydro-forming to shape large character of product, then use high energy to form small features, such as convex tables, bars etc. The present work investigates the shock wave generation of hybrid impact hydroforming. In this paper, the theory of shock wave is presented and finite element simulation was carried out by using MSC. The pressure distribution changes in the depth direction, but not in the width direction. Using this shock wave loading condition we did forming experiments. Punching occurred as a result of combined tensile and shear stress effects. Furthermore, the design precise of die and clearance between punch and die may less strict. Therefore, the research is very useful for the development and application of hybrid impact hydroforming.

scholarly journals Evaluation of the impact of the COVID-19 lockdown on the quality of life of patients monitored for cancer who practice an adapted physical activity: rugby for health

2021 ◽  
Author(s):  
Stéphanie Motton ◽  
Kelig Vergriete ◽  
Luc Nguyen VanPhi ◽  
Eric Lambaudie ◽  
Audrey Berthoumieu ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Physical Activity ◽  
Psychological Distress ◽  
High Energy ◽  
Psychological Status ◽  
Adapted Physical Activity ◽  
Cancer Treatments ◽  
Health Crisis ◽  
The Impact

Abstract Purpose The benefits of regular physical exercise on the tolerability of cancer treatments, quality of life and survival rates post-diagnosis have been demonstrated but all supervised physical activities have been interrupted due to the global health crisis and the need for lockdown to halt the spread of SARS-CoV-2. To reintroduce activities post-lockdown, we wanted to assess the impact of the COVID-19 lockdown on the quality of life and the psychological status of patients who practice an adapted physical activity such as rugby for health. Methods The evaluation was conducted in two phases: an initial self-questionnaire comprised of 42 questions sent to all participants to assess the impact of lockdown and a second assessment phase in the presence of the participants. We assessed anthropometric data, functional fitness parameters, quality of life and the psychosocial status of the subjects. The data were compared to pre-lockdown data as part of a standardised follow-up procedure for patients enrolled in the programme. Results 105/120 (87.5%) individuals responded to the rapid post-lockdown survey analysis. In 20% of the cases, the patients reported anxiety, pain, a decline in fitness and a significant impact on the tolerability of cancer treatments. Twenty-seven patients agreed to participate in the individual analysis. Following lockdown, there was a significant decrease in the intensity of physical activity (p = 8.223e–05). No post-lockdown changes were noted in the assessments that focus on the quality of life and the level of psychological distress. Conversely, there was a significant correlation between the total of high energy expended during lockdown and the quality of life (p = 0.03; rho = 0.2248) and the level of psychological distress post-lockdown (p = 0.05; rho = − 0.3772). Conclusion Lockdown and reduced physical activity, particularly leisure activities, did not impact the overall health of the patients. However, there was a significant correlation with the level of physical activity since the higher the level of physical activity, the better the quality of life and the lower the level of psychological distress.

scholarly journals Pengembangan Kerajinan Sangkar Burung Kelurahan Kadipiro, Surakarta, Jawa Tengah

Abdi Seni ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 120-127
Author(s):  
Aan Sudarwanto ◽  
Rahayu Adi Prabowo ◽  
Ari Supriyanto
Keyword(s):  
Human Resources ◽  
Community Service ◽  
Production System ◽  
Raw Materials ◽  
Branded Product ◽  
Skilled Workforce ◽  
The Many ◽  
Short Time ◽  
The Impact

AbstrakKriya mempunyai cakupan yang sangat luas salah satunya adalah   kriya kayu, dimana   konsentrasi penggunaan bahan baku utamanya   didominasi   bahan baku kayu. Diantara keragaman produk kriya kayu adalah produk kerajian sangkar burung. Dari data yang ada diketahui bahwa dalam 10 tahun terakhir telah mengalami booming. Hal ini karena banyaknya muncul peternak burung sebagai komoditi perdagangan maupun banyaknya komunitas-komunitas pecinta burung baik dari kalangan masyarakat ekonomi lemah hingga masyarakat menengah dan atas. Kebutuhan sangkar burung meningkat dengan pesat hampir merata di setiap daerah dan berdampak pula muncul sentra kerajinan sangkar burung sebagai kantong penghasil sangkar burung. Salah satunya sentra kerajinan sangkar burung di kalurahan Kadipiro, Banjarsari, Surakarta. Terdapat  beberapa permasalahan  yang  menjadikendala di sentra kerajinan sangkar burung di kalurahan Kadipiro Surakarta, diantaranya adalah; Tidak mampu memproduksi dalam waktu yang singkat, tidak adanya standarisasi produk fungsional, kurangnya tenaga kerja trampil dalam mengembangkan produk. Tidak ada produk dengan branded tertentu sehingga mudah ditiru. Berpijak dari permasalahan dan kondisi di sentra kerajinan sangkar burung Kadipiro  maka  dilakukan kegiatan peningkatan pengembangan produk sangkar burung melalui program PPM, dengan target pengusaha bernama Yudi Haryadi yang saat ini sedang merintis kerajinan sangkar burung bernama “Carisa Sangkar” . Fokus dari kegiatan PPM ini lebih diarahkan pada pada aspek peningkatan kualitas produk karya kriya kayu khususnya sangkar burung dengan pembuatan desain yang baik sampai  menjadi  prototype.  Kemudian  dilakukan  penguatan sumber  daya  manusia, melalui pendampingan lapangan, yang diharapkan dapat meningkatkan penjualan dan sekaligus secara tidak langsung dapat meningkatan kesejahteraan masyarakat.Kata kunci : Kriya,  kreativitas, sangkar burung, sistem produksi AbstractCraft has a very broad scope one of which is wood craft, where the concentration of the use of raw materials  is mainly  dominated by  wood raw  materials. Among the  wood craft  products are  bird cage. It is known that in the last 10 years becoming the peak season. This is due to the large number of bird breeders emerging as trade commodities as well as the many bird-loving communities from among the economically weak to the middle and upper classes. The need for bird cages is rapidly increasing almost evenly in every area and the impact is also emerging centers of bird cage crafts as bird cage producers. One  is a bird cage craft center in Kadipiro , Banjarsari, Surakarta. There are a number of problems that have become obstacles in the bird cage handicraft center in Kadipiro Surakarta, including not able to produce in a short time, there is no standardization of functional products, lack of skilled workforce in developing products. There is no specific branded product so it is easy to imitate. Based on the problems and conditions in the Kadipiro bird cage craft, activities to improve the development of bird cage products through the community service , with the target of a businessman named Yudi Haryadi who is currently pioneering a bird cage craft called “Carisa Cage”. Improving the quality of wood craft products, especially birdcages by making good designs to become prototypes. Then do strengthening human resources, through field assistance, which is expected to increase sales and at the same time indirectly improve community welfare.Keywords: crafts, creativity, bird cage, production system

Relationship between mechanical behavior and microstructure evolution of sintered metallic brake pad under impact of thermomechanical stress

2021 ◽  
pp. 1-18
Author(s):  
Hoang-Long Le Tran ◽  
Anne-Lise Cristol ◽  
Jérôme Hosdez ◽  
Vincent Magnier
Keyword(s):  
Temperature Gradient ◽  
Thermal Gradient ◽  
Experimental Approach ◽  
Compressive Load ◽  
Experimental Tests ◽  
High Energy ◽  
Brake Pad ◽  
Thermomechanical Stress ◽  
The Impact ◽  
Graphite Inclusions

Abstract It is well known that on the brake pad material, the triptych microstructure-properties-solicitations is the key to better understand the phenomena caused by braking stress. The challenging issues are the evolution of this triptych, i.e., the impact of thermal stress and mechanical stress on the microstructure which undoubtedly induces changes in properties. In order to solve the issues without tackling them in all their complexity, this study proposes an experimental approach where physics is decoupled but inspired by the braking sequence in terms of applied temperature gradient and braking loads. Two experimental tests were carried out. The first one is the thermal solicitation test where a temperature gradient from 400°C to 540°C was applied to the material. The second one is the thermomechanical test where a compressive load at 20 MPa was applied under the same thermal gradient. The experiment time is fixed for two minutes, equivalent to the time of one braking stroke. The referred material is sintered metallic composite, which is widely used as brake pad material for high-energy railways. As result, it shows that coupled thermomechanical stress has a greater impact on the material properties than decoupled one. This impact is related to the microstructure where graphite inclusions play an important role.

Numerical Simulation on Drawing Deep of Cylindrical Pieces Based on Dynaform

2014 ◽  
Vol 684 ◽  
pp. 252-258 ◽  
Author(s):  
Jun Hong Wang ◽  
Xu Dong Bao ◽  
Hai Mei Feng ◽  
Chang Du
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Forming Process ◽  
Minimum Thickness ◽  
Optimum Parameters ◽  
Design And Manufacture ◽  
The Impact

Abstract: The design and manufacture of mold often rely on the experience of the designers, which led to the fact that the mold needs to be repeatedly debugged and corrected. Numerical simulation technology enables the simulation of the forming process of sheet metal and prediction of defects in design, thus to improve labor efficiency, save time and reduce costs. In this paper, the software Dynaform is used as a platform and a three-dimensional model is built to numerical simulate and analyze the drawing deep of a typical thin-walled cylindrical piece.Orthogonal experimentis adopted to analyze the impact of BHF, punching speed and punch-die gap on forming quality of the drawing pieces. With minimum thickness and wrinkling as indicators, the impact of various factors is analyzed and a set of optimum parameters is found out that is, BHF is 20kN, punching speed is 2000mm / s and punch-die gap is 0.9mm.

Experimental Research on Impact Line of Hyperboloid Shallow Shell

2010 ◽  
Vol 139-141 ◽  
pp. 567-570
Author(s):  
Li Hong Zhao ◽  
Zheng Yi Ren ◽  
Shu Yong Jiang ◽  
Nan Yang
Keyword(s):  
Process Conditions ◽  
Forming Process ◽  
Shape Accuracy ◽  
Test Analysis ◽  
Shallow Shells ◽  
Blank Holding Force ◽  
Auto Body ◽  
Design And Manufacture ◽  
The Impact

Impact line is one of important factors to affect the shape accuracy and surface quality of auto body panel design and manufacture. It is difficult to study because of the complexity shape of auto body panels. The system of test analysis on impact line is established by analyzing the shapes and forming processes of auto-body panels, of which based on hyperboloid shallow shells. The criterion and research technique of impact line are introduced. Extensive experiment results, which show the effects of forming process conditions, such as blank holding force, draw bead arrangement, and lubrication on impact line, are achieved. It can be concluded that the draw bead arrangement significantly influence the impact line, the displacement of impact line is different with difference of blank holding force and the friction coefficient.

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