scholarly journals Optimization Algorithm and Joint Simulation to Micro Thermal Deformation Using Temperature Measurement in the Orifice of Hydraulic Valve

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1136
Author(s):  
Qianpeng Chen ◽  
Hong Ji ◽  
Hongke Zhao ◽  
Jing Zhao
Keyword(s):  
Optimization Algorithm ◽  
Quantitative Research ◽  
Thermal Deformation ◽  
Measurement Data ◽  
Sharp Edge ◽  
Large Drop ◽  
Joint Simulation ◽  
Valve Orifice ◽  
Spool Valve ◽  
Hydraulic Valve

When exposed to viscous heating, hydraulic valve orifices experience thermal deformation, which causes spool clamping and actuator disorder. Quantitative research on thermal deformation can help reveal the micro-mechanism of spool clamping. In this study, miniature thermocouples are embedded into a valve orifice with an opening size of 1 mm to measure temperature distribution. An optimization algorithm based on measurement data (M-OA) for the thermal deformation of the valve orifice is proposed. The temperature and thermal deformation of the valve orifice are calculated through Fluent and Workbench joint simulation, with the measurement data serving as boundary conditions. Results show that, for a valve orifice with a valve wall length of 18 mm, when the temperature of the sharp edge is at 60 °C, thermal deformation measures 7.7 μm via observation and 7.62803 μm via M-OA, indicating that the M-OA method is reliable. The results of the joint simulation can be accepted because measurements of temperature reached an accuracy rate of 95%, and that of deformation reached 82.7%. A large drop in pressure led to a rapid increase in temperature, causing serious thermal deformation of the valve orifice. With an inlet pressure of 3 MPa, the temperature of the sharp edge reached 72.9 °C within 110 min, and radial thermal deformation can reach 8.3 μm. Such deformation poses great risk of spool clamping for a spool valve of Φ36 mm.

A Tale of Two Cultures

2012 ◽  
Author(s):  
Gary Goertz ◽  
James Mahoney
Keyword(s):  
Social Sciences ◽  
Quantitative Research ◽  
Social Science Research ◽  
Measurement Data ◽  
Science Research ◽  
Quantitative Research Methods ◽  
Qualitative And Quantitative ◽  
The Social ◽  
Scientific Worldview ◽  
Different Cultures

Some in the social sciences argue that the same logic applies to both qualitative and quantitative research methods. This book demonstrates that these two paradigms constitute different cultures, each internally coherent yet marked by contrasting norms, practices, and toolkits. The book identifies and discusses major differences between these two traditions that touch nearly every aspect of social science research, including design, goals, causal effects and models, concepts and measurement, data analysis, and case selection. Although focused on the differences between qualitative and quantitative research, the book also seeks to promote toleration, exchange, and learning by enabling scholars to think beyond their own culture and see an alternative scientific worldview. The book is written in an easily accessible style and features a host of real-world examples to illustrate methodological points.

scholarly journals INTENSITAS CAHAYA ALAMI PADA RUANG KELAS PERKULIAHAN

2020 ◽  
Vol 5 (1) ◽  
pp. 1-11
Author(s):  
Muh. Awaluddin Hamdy ◽  
Nurul Jamala ◽  
Ramli Rahim ◽  
Baharuddin Hamzah ◽  
Rosady Mulyadi ◽  
...  
Keyword(s):  
Data Analysis ◽  
Quantitative Research ◽  
Measurement Data ◽  
Building Design ◽  
Building Envelope ◽  
Quantitative Research Methods ◽  
The North ◽  
Energy Efficient Buildings ◽  
Building Facade ◽  
Human Labor

Title: Natural Light Intensity Analysis in Classroom; Case Study: Classroom at Bosowa University Lighting is an important part of buildings in supporting the productivity of human labor. Insufficient lighting can interfere with human activities and could cause health problems, like eye disorders. Building design must consider the functions and needs so that residents can feel comfortable. Good lighting levels can be achieved by utilizing natural and artificial lighting. The purpose of this study was to analyze the level of illumination in a room that is directly related to the openings of the building envelope and to analyze the different levels of illumination in classrooms with different orientations. Quantitative research methods by distributing measurement data in the form of tables, diagrams and graphs. Data analysis was performed using statistics and data analysis techniques, the results of the measurement were statistically descriptive. This study analyzed the differences in the level of illumination in the northern orientation and southern orientation classrooms. Based on the results of the analysis it can be concluded that the orientation of the building affects the level of illumination in the room. During the day the level of illumination is higher in the direction of orientation north than the direction of orientation south, especially the measurement point in the area close to the openings of the building envelope, but in this study the direction of classroom orientation towards the south is higher the level of illumination compared to the north orientation classrooms. This is understood by the treatment of building glass sheaths in the north orientation direction in the form of the use of frosted glass wallpaper, so it can be concluded that changes to the building facade affect the level of room illumination. The results of this study are expected to be a reference in building facade concepts and designing energy-efficient buildings.

Benchmark Study of Five Optimization Algorithms for Weather Routing

2017 ◽  
Author(s):  
Helong Wang ◽  
Wengang Mao ◽  
Leif Eriksson
Keyword(s):  
Dynamic Programming ◽  
Fuel Consumption ◽  
Optimization Algorithm ◽  
Optimization Algorithms ◽  
Measurement Data ◽  
Shipping Industry ◽  
Advantages And Disadvantages ◽  
Benchmark Study ◽  
Routing Optimization ◽  
Weather Routing

Safety and energy efficiency are two of the key issues in the maritime transport community. A sail plan system, which combines the concepts of weather routing and voyage optimization, are recognized by the shipping industry as an efficient measure to ensure a ship’s safety, gain more economic benefit, and reduce negative effects on our environment. In such a system, the key component is to develop a proper optimization algorithm to generate potential ship routes between a ship’s departure and destination. In the weather routing market, four routing optimization algorithms are commonly used. They are the so-called modified Isochrone and Isopone methods, dynamic programming, threedimensional dynamic programming, and Dijkstra’s algorithm, respectively. Each optimization algorithm has its own advantages and disadvantages to estimate a ship routing with shortest sailing time or/and minimum fuel consumption. This paper will present a benchmark study that compare these algorithms for routing optimization aiming at minimum fuel consumption. A merchant ship sailing in the North Atlantic with full-scale performance measurements, are employed as the case study vessels for the comparison. The ship’s speed/power performance is based on the ISO2015 methods combined with the measurement data. It is expected to demonstrate the pros and cons of different algorithms for the ship’s sail planning.

Study on Automatic Measurement of Valve Orifice Characteristic Based on Pneumatic Flow Method

2008 ◽  
Vol 392-394 ◽  
pp. 240-244 ◽  
Author(s):  
J. Liu ◽  
Guang Lin Wang ◽  
N. Xu
Keyword(s):  
Flow Characteristic ◽  
Characteristic Curve ◽  
Quality Analysis ◽  
Linear Segment ◽  
Servo Valve ◽  
Flow Method ◽  
Manufacturing Quality ◽  
Valve Orifice ◽  
Valve Overlap ◽  
Spool Valve

Spool valve orifice flow characteristic of servo valve plays an important role in the spool valve overlap measurement and manufacturing quality analysis of servo valve. The liner segment of flow characteristic curve could be used to calculate the overlap, and the non-linear segment could be used to evaluate the manufacturing quality of servo valve. This paper analyzed the valve orifice characteristic measurement based on the pneumatic flow method in detail, developed an automatic pneumatic measurement apparatus for valve orifice characteristic and spool valve overlap based on the thermal mass flow sensor AWM2300, verified the measurement accuracy and non-repeated error of this apparatus, and adopted the overlap as investigated object to contrast the measurement results by pneumatic flow method with by pneumatic pressure method. The non-repeated error of overlap measurement by pneumatic flow method did not exceed ±0.5(m, and the experimental results indicated that the automatic pneumatic flow measurement can excellently satisfy the actual requirement in the production of servo valve.

scholarly journals The Effect of Discipline on Employees’ Work Performance on the E-warong KUBE PKH Program at Social Empowerment and Poor Management of the Sosial Service of Pekanbaru

Jurnal Niara ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 97-108
Author(s):  
Surya dailiati ◽  
Sri roserdevi nasution
Keyword(s):  
Data Analysis ◽  
Social Services ◽  
Quantitative Research ◽  
Work Performance ◽  
Measurement Data ◽  
Population Data ◽  
Operational Definition ◽  
Analysis Technique ◽  
The Social ◽  
Social Empowerment

This research aims to find out the effect of work discipline on the performance of employees on E-warong KUBE PKH at social empowerment and Poor People’s Management of Pekanbaru’s Sosial Department. This research is a quantitative research with an associative approach. Operational definition includes indicators and Discipline Variable (X) namely attendance, obedience to work standards, high alertness, and athical work. Then the performance variable (Y) is productivity, service quality, responsiveness, responsibility, and accountability. This research has a population of 39 people from the Office of Social Services in Pekanbaru, the sampling teachnique using the census method is the overall retrieval of the existing population. Data collection techniques used was Observation, Questionnaire and Documentation. Measurement data used is the Likert Scale. The data analysis technique used is Simple regression.Conclusions based on data analysis and testing of the resulting hypothesis, namely the influence of Discipline on the Performance of Supervisors on the E-warong KUBE PKH in the field of social empowerment and poor handling of the Social Service of Pekanbaru City obtained the results of Y = 14,576 + 0,722x and Significant t results of 72%. Then based on the test results of the Guerdian of the E-warong KUBE PKH in the field of social empowerment and the managent of the poor, Pekanbaru social services were 55,4%.

A two-step approach to damage localization at supporting structures of offshore wind turbines

2017 ◽  
Vol 17 (5) ◽  
pp. 1313-1330 ◽  
Author(s):  
Karsten Schröder ◽  
Cristian Guillermo Gebhardt ◽  
Raimund Rolfes
Keyword(s):  
Numerical Model ◽  
Objective Function ◽  
Wind Turbines ◽  
Optimization Algorithm ◽  
Measurement Data ◽  
Offshore Wind ◽  
Mode Shapes ◽  
Damage Localization ◽  
Offshore Wind Turbines ◽  
Supporting Structures

This article introduces a new adaptive two-step optimization algorithm for finite element model updating with special emphasis on damage localization at supporting structures of offshore wind turbines. The algorithm comprises an enhanced version of the global optimization algorithm simulated annealing, the simulated quenching method that approximates an initial guess of damage localization. Subsequently, sequential quadratic programming is used to compute the final solution adaptively. For the correlation of numerical model and measurement data, both a measure based on eigenfrequencies and mode shapes and a measure employing time series are implemented and compared with respect to their performance for damage localization. Phase balance of the time signals is achieved using cross-correlation. The localization problem is stated as a minimization problem in which the measures are used in time and modal domain as the objective function subject to constraints. Furthermore, the objective function value of the adjusted model is used to distinguish correct from wrong solutions. The functionality is proven using a numerical model of a monopile structure with simulated damage and a lab-scaled model of a tripile structure with real damage.

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