A New Method for Calculating Burst Speed of Aeroengine Disks

1992 ◽  
Vol 114 (2) ◽  
pp. 334-337
Author(s):  
Hong Qilin ◽  
Zheng Qixuan ◽  
Wang Ping ◽  
Hou Guicang
Keyword(s):  
Large Deformation ◽  
Deformation Theory ◽  
New Method ◽  
Test Results ◽  
Deformation Method ◽  
Calculation Results ◽  
Basic Equations ◽  
Calculation Procedures

An approximate analytical large deformation method, based on the Nadai deformation theory, for calculating the burst speed of aeroengine disks, is presented in this paper. The basic equations are developed and the calculation procedures are illustrated. The burst speeds are calculated for some tested disks, and the calculation results are compared with the test results; the differences between two results are shown to be less than 8 percent. This shows that the new method is both simple and convenient. Therefore, it could be employed in the development of aeroengine disks.

scholarly journals A New Method for Calculating Burst Speed of Aeroengine Disks

1991 ◽  
Author(s):  
Hong Qilin ◽  
Zheng Qixuan ◽  
Wang Ping ◽  
Hou Guicang
Keyword(s):  
Large Deformation ◽  
Deformation Theory ◽  
New Method ◽  
Test Results ◽  
Deformation Method ◽  
Calculation Results ◽  
Basic Equations ◽  
Calculation Procedures

An approximate analytical large deformation method, based on Nadai deformation theory, for calculating the burst speed of aeroengine disks is presented in this paper. The basic equations are developed and the calculation procedures are illustrated. The burst speeds are calculated for some tested disks, and the calculation results are compared with the test results, the differences between two results are shown to be less than 8%. It shows that the new method is both simple and convenient. Therefore, it could be employed in the development of aeroengine disks.

Improved Image Registration Technique Using Demons and B-Spline

2013 ◽  
Author(s):  
Chao Tang ◽  
Xiaohui Xie ◽  
Ruxu Du
Keyword(s):  
Image Registration ◽  
Large Deformation ◽  
Small Deformation ◽  
New Method ◽  
Free Form ◽  
Spline Method ◽  
Deformation Method ◽  
B Spline ◽  
Demons Algorithm ◽  
Better Than

Non-rigid image registration is an important and challenge work in image processing. The demons algorithm is one of the most effective non-rigid image registration methods. However, it is only suitable for images with small deformation. In recent years, many improving techniques are proposed. The free form deformation method based on B-spline function is widely employed in non-rigid image registration and is good at dealing with large deformation image registration. However, the performance of the demons algorithm is better than that of the B-spline method in dealing with small deformation registration. Therefore, in this paper, we propose to combine the demons algorithm and the B-spline method. The new method consists of two steps: First, it applies the B-spline method to deal with the large deformation. Then, it uses the demons algorithm to treat the small deformation. The testing results show that the new method is effective in dealing images with both small and large deformations. Comparing to the demons algorithm as well as the B-spline method, the new method has the smallest registration error and hence, is the best.

Reduction of Forced Vibration Response by Optimum Balance of Linkage and Optimum Design of System

1997 ◽  
Author(s):  
She-min Zhang ◽  
Nobuyoshi Morita ◽  
Takao Torii
Keyword(s):  
Objective Function ◽  
Root Mean Square ◽  
Forced Vibration ◽  
Vibration Response ◽  
New Method ◽  
Mean Square ◽  
Design Variables ◽  
Calculation Results ◽  
Angular Velocities ◽  
Optimum Balance

Abstract This paper proposes a new method to reduce the forced vibration response of frame of linkage. It is that the root-mean-square (RMS) value of binary maximum (Bmax) of forced vibration response at a series of angular velocities is taken as the objective function, and the counterweight mass parameters of links and the stiffness factors are used as design variables. Then, it is found out that the responses are related not only to the Bmax value of shaking forces, but also to the shape of curve of shaking forces. The calculation results are compared with those of two other methods used in the reduction of forced vibration response by optimized balance of linkages, and it is shown that the new method can significantly reduce the responses of frame of linkage.

New Method for Measuring Liquid Level in WFGD System

2011 ◽  
Vol 418-420 ◽  
pp. 1804-1807
Author(s):  
Li Li ◽  
Zheng Hui Tan ◽  
Jia Wen Liu
Keyword(s):  
Flue Gas ◽  
Traditional Method ◽  
Large Deviation ◽  
Flue Gas Desulfurization ◽  
New Method ◽  
Liquid Level ◽  
Test Results ◽  
Economic Operation ◽  
Local Test ◽  
Operation Cost

Traditional method for measuring liquid level of absorption tower in wet flue gas desulfurization (WFGD) system is introduced in this paper, and it's found that measuring accuracy of the method exists in large deviation. A new method is proposed to measure liquid level of absorption tower for this situation. The local test results show that not only measurement result of new method is more close to the actual liquid level than traditional method, but also using new method can save operation cost and ensure the safety, stability, and economic operation of WFGD system.

In-Plane Force Effect of Reinforced Concrete Beam with Elastic Supports

2011 ◽  
Vol 287-290 ◽  
pp. 1896-1901
Author(s):  
Zhi Kun Guo ◽  
Wan Xiang Chen ◽  
Qi Fan Wang ◽  
Yu Huang ◽  
Chao Pu Li ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Nonlinear Characteristics ◽  
Elastic Supports ◽  
Calculation Results ◽  
Basic Equations ◽  
First Time ◽  
Good Agreement

The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.

scholarly journals Determination of Nearest Emergency Service Office using Haversine Formula Based on Android Platform

2018 ◽  
Vol 5 (2) ◽  
pp. 270-278 ◽  
Author(s):  
M. Basyir ◽  
M. Nasir ◽  
Suryati Suryati ◽  
Widdha Mellyssa
Keyword(s):  
Emergency Service ◽  
Emergency Services ◽  
Message Delivery ◽  
Test Results ◽  
Average Delay ◽  
Accuracy Test ◽  
Calculation Results ◽  
Testing Accuracy ◽  
Selection Of

Emergency Reporting Application is an android-based application that serves to help the community in reporting the emergency condition. This application allows users to choose and contact the emergency services office, without the need to notice their position and phone number. Selection of emergency services office is also automatically selected by the system by taking into account the distance between the complainant and the emergency services office. The selected emergency services office is the nearest emergency service office from the complainant so that the delay in coming assistance can be minimized. Therefore, this proposed application requires a GPS feature to recording, reporting and SMS positioning for message delivery of reports. The distance between the position of the complainant and the position of the emergency service office, in the form of latitude and longitude data, is requested using the Haversine formula taking into account the degree of curvature of the earth. Emergency service offices include police and hospital offices spread over 25 different districts. Furthermore, the reporter's position calculation results were compared with all selected emergency service offices and obtained 1 nearest emergency service office. Calculating the accuracy and delay value of the system will do system testing. Accuracy test results using the method of 100% Haversine and the average delay of the system is 4.5 seconds.

scholarly journals PENGUJIAN PERFORMA REAKTOR DOWNDRAFT BIOMASSA KOTORAN SAPI

POROS ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 121
Author(s):  
Muhammad Ridwan Ridwan ◽  
Noviyanti Nugraha Nugraha
Keyword(s):  
Alternative Energy ◽  
Power Plants ◽  
Gas Content ◽  
Cow Dung ◽  
Test Results ◽  
Discharge Temperature ◽  
Calculation Results ◽  
Chamber Temperature ◽  
Biomass Power Plant ◽  
Biomass Power Plants

Biomass power plants are electricity generators with alternative energy that utilize organicmaterials, in this case cow dung. The cow dung is then processed to produce syngas. Syngas is used as fuelto turn turbines. In previous studies, a cow manure gasification reactor was designed and manufactured.This reactor is part of a biomass power plant system (PLTBm) which is made separately. The power outputtarget of this PLTBm is 370 kW. The purpose of this study was to examine the performance of the downdraftreactor of cow dung biomass, namely discharge, temperature, and analyze the gas content released by thereactor so that the power that can be generated by the reactor can be obtained. The test results obtained acombustion chamber temperature of 580°C and a discharge of 0.285 m3/s. The composition of the outputgas is acetylene 58.16%, hexane 27.66%, butane 6.38%, and methane 7.8%. From the calculation results,the power generated by the reactor is 342 kW.

scholarly journals PENGARUH KEPERCAYAAN DAN ELECTRONIC WORD OF MOUTH (eWOM) TERHADAP PURCHASE INTENTION (Studi Pada Pelajar Kampung Inggris Pare-Kediri)

2019 ◽  
Vol 4 (1) ◽  
pp. 63
Author(s):  
Akhmad Nasir
Keyword(s):  
Purchase Intention ◽  
Word Of Mouth ◽  
Sampling Technique ◽  
Electronic Word Of Mouth ◽  
Test Results ◽  
Simultaneous Test ◽  
Library Studies ◽  
Calculation Results ◽  
English Village

This study aims to find out and analyze the influence of eWOM (Electronic Word Of Mouth) Trust and Purchase Intention on Students in the English village of Pare-Kediri. The population in this study were those who took courses at the Pare-Kediri English village course institute in January-March 2019 which obtained a sample of 100 respondents with accidental sampling technique. Methods of collecting data using questionnaires, observation, interviews, and library studies. The test results partially show that there is a significant and significant effect on the trust variable on Purchase Intention as evidenced by a significant value of 0,000 which is smaller than 0.05 (0,000 <0,05). The partial test results show that there is a significant and significant effect between eWOM variables on Purchase Intention as evidenced by a significant value of 0.005 which is smaller than 0.05 (0.005 <0.05). Based on the calculation results obtained a significant value is 0,000. This shows that the significant value of the test is the trust variable F and eWOM <0.05, which means that the results of this simultaneous test are trust and eWOM has an effect on Purchase Intention. Penelitian ini bertujuan untuk mengetahui dan menganalisis pengaruh Kepercayaan Dan eWOM ( Elektronik Word Of Mouth ) teradap Purchase Intention pada Pelajar di kampung inggris Pare-Kediri. Populasi dalam penelitian ini adalah yang mengambil kursus di lembaga kursus kampung inggris Pare-Kediri pada bulan Januari-Maret 2019 yang  diperoleh sampel sebanyak 96 responden dengan teknik accidental sampling. Metode pengumpulan data menggunakan kuesioner, obsevasi, wawancara, dan Studi kepustakaan. Hasil pengujian secara parsial menunjukan bahwa berpengaruh dan signifikan antara variabel kepercayaan terhadap Purchase Intention yang dibuktikan dengan nilai signifikan sebesar 0,000 dimana lebih kecil dari 0,05 (0,000 < 0,05). Hasil pengujian secara parsial menunjukan bahwa berpengaruh dan signifikan antara variabel eWOM terhadap Purchase Intention yang dibuktikan dengan nilai signifikan sebesar 0,005 dimana lebih kecil dari 0,05 (0,005 < 0,05). Berdasarkan hasil perhitungan diperoleh nilai signifikan adalah 0,000. Hal ini menunjukan bahwa nilai signifikan uji F variabel kepercayaan dan eWOM <0,05 yang berarti hasil dari pengujian simultan ini adalah kepercayaan dan eWOM berpengaruh terhadap Purchase Intention.

A New Method to Measure Prandtl Number and Thermal Conductivity of Fluids

1957 ◽  
Vol 24 (1) ◽  
pp. 25-28
Author(s):  
E. R. G. Eckert ◽  
T. F. Irvine
Keyword(s):  
Thermal Conductivity ◽  
Boundary Layer ◽  
Prandtl Number ◽  
High Velocity ◽  
Atmospheric Pressure ◽  
New Method ◽  
Test Results ◽  
Test Setup ◽  
Velocity Boundary Layer ◽  
Layer Flow

Abstract A new method is described by which the Prandtl number and indirectly the thermal conductivity of fluids can be measured. The method is based on the fact that a well-established, unique relation exists between the Prandtl number and the recovery factor for laminar high-velocity boundary-layer flow. The test setup is described which has been devised for such measurements, and test results are presented for air at atmospheric pressure and temperatures between 60 and 350 F.

Calculation methods of bridge deck for prestressed short rib T-beam bridges

2020 ◽  
pp. 1-13
Author(s):  
Sijia Wang ◽  
Tianlai Yu
Keyword(s):  
Finite Element ◽  
Bridge Deck ◽  
Mechanical Performance ◽  
Test Results ◽  
Analysis Method ◽  
Slab Method ◽  
Element Analysis ◽  
Calculation Results ◽  
Beam Bridge ◽  
T Beam

Because of the low height of the prestressed short rib T-beam bridge and the poor torsion resistance of the main beam, the positive moment in the middle span of the bridge deck will increase correspondingly compared with the normal rib beam bridge. At present, there is little research on the calculation method of the bridge deck of the prestressed short rib T-beam bridge. In this paper, the space finite element method and the continuous one-way slab method are used to calculate the forces on the bridge deck, based on the space finite element method, a finite element elastic supported continuous beam method is proposed to calculate the forces on the bridge deck. By comparing the calculation results of the three methods with the test results, the reasonable calculation method of the bridge deck is studied. The results show that the spatial finite element analysis method can simulate the mechanical performance of the deck of the bridge of the prestressed short rib T-beam bridge well, the stress calculation results are consistent with the test results, and the calculation accuracy is high, which can be used in the actual engineering design; The finite element analysis method of elastic support continuous beam can also simulate the mechanical performance of the deck of the bridge of the prestressed short rib T-beam bridge. The concept of the method is clear, the calculation is convenient, and it is more suitable for the application of engineering design; The calculation results of the continuous one-way slab method are too large to be safe for design.

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