scholarly journals Design and research of a center adjustment mechanism based on missile ground test stand

2021 ◽  
Vol 2125 (1) ◽  
pp. 012066
Author(s):  
Gao-lin Ren ◽  
Xue-wei Zhang ◽  
Qiang Wei ◽  
Chen-hui Lei ◽  
Zhen Zhang ◽  
...  
Keyword(s):  
Cost Saving ◽  
Test Stand ◽  
Practical Significance ◽  
Test Bed ◽  
Positioning Accuracy ◽  
Structure Selection ◽  
Adjustment Mechanism ◽  
Ground Test ◽  
Standard Structure ◽  
Installation Time

Abstract For a missile ground test stand that requires a lot of core installation, such as the inner and outer labyrinth centering installation. There are some problems in the installation process, such as complex installation process, difficult adjustment, long installation time, poor positioning accuracy and so on. This paper takes the inner and outer labyrinth centering installation as an example, through non-standard structure selection and processing, designed a set of centering adjustment mechanism, through the field installation comparison, it is concluded that the new centering adjustment mechanism has the advantages of high positioning accuracy, simple operation, greatly saving working time, quick and simple adjustment, etc. The new centripetal adjustment mechanism is also simple, efficient and cost saving for other tasks that need centripetal adjustment on missile ground test bed. Its design and research have high engineering practical significance.

An Insight into the Features of the OAO-C Thermal Design

1973 ◽  
Vol 95 (4) ◽  
pp. 1039-1047 ◽  
Author(s):  
H. Fine ◽  
J. Quadrini ◽  
S. Ollendorf
Keyword(s):  
Thermal Control ◽  
Astronomical Observatory ◽  
Thermal Design ◽  
Test Bed ◽  
Large Space ◽  
Flight Data ◽  
The Earth ◽  
Ground Test ◽  
Earth Observation Satellite ◽  
Insight Into

The Orbiting Astronomical Observatory (OAO)-C was successfully launched into 400-nautical mile circular orbit on August 21, 1972. For this spacecraft, a unique sensitivity approach to the thermal design was developed which resulted in a predictal design—the merits of which should be considered for application on future spacecra. The OAO-C is also serving as a test bed for the evaluation of thermal control hardware. To provide flight data for space program applications, experiments for a new coating and four different heat pipe designs are on this spacecraft. The data derived from OAO-C will be extremely valuable for such future programs as the Large Space Telescope (LST) and the Earth Observation Satellite (EOS). This paper will describe the detailed of the sensitivity design approach and thermal control hardware. For all aspects discussed, a comparison of pertinent analysis, ground test data, and flight data [1] will be given.

scholarly journals Experimental test stand for development of an opposed-piston engine and initial results

2017 ◽  
Vol 169 (2) ◽  
pp. 76-82
Author(s):  
Jakub KALKE ◽  
Marcin OPALIŃSKI ◽  
Paweł MAZURO
Keyword(s):  
Predictive Model ◽  
Research Work ◽  
Control Unit ◽  
Preliminary Test ◽  
Test Stand ◽  
Software Test ◽  
Diagnostic Model ◽  
Test Bed ◽  
Future Improvement ◽  
Initial Results

The article presents the reason for developing a 0D predictive and diagnostic model for opposed-piston (OP) engines. Firstly, a description of OP engines, together with their most important advantages and challenges are given together with current research work. Secondly, a PAMAR-4 engine characteristic is presented. After that the proposed 0D predictive model is described and compared with the commercially availible software. Test stand with most important sensors and solutions are presented. After that the custom Engine Control Unit software is characterized together with a 0D diagnostic model. Next part discusses specific challenges that still have to be solved. After that the preliminary test bed results are presented and compared to the 0D simulations. Finally, the summary together with possible future improvement of both 0D predictive model and test bed capabilities are given.

Visual Measurement for On-Orbit Reflector Assembly

2015 ◽  
Vol 27 (5) ◽  
pp. 480-488 ◽  
Author(s):  
Shin-ichiro Nishida ◽  
◽  
Heihachiro Kamimura ◽  
Keyword(s):  
Servo Control ◽  
Robot Arm ◽  
Visual Servo ◽  
Large Telescope ◽  
Test Bed ◽  
Large Space ◽  
Visual Servo Control ◽  
Visual Measurement ◽  
Space Telescope ◽  
Ground Test

<div class=""abs_img""> <img src=""[disp_template_path]/JRM/abst-image/00270005/03.jpg"" width=""300"" /> Artist concept of in-orbit assembly</div>In Earth orbit, a space telescope is free from any absorption or disturbances from the Earth's atmosphere. Therefore, a large space telescope is planned for the future. We discuss the assembly of a large telescope reflector performed by a robot arm. For the assembly work, positioning of the arm using visual servo control to colored markers is proposed. A ground test-bed is used to test the characteristics of the new image processing method for colored markers. The results of the tests are also given.

Measurement of Torque Moment of Aircraft Electric Drive Unit

2013 ◽  
Vol 486 ◽  
pp. 173-180
Author(s):  
Jindřich Rosa ◽  
Jan Cagáň
Keyword(s):  
Electric Drive ◽  
Test Stand ◽  
Strain Gages ◽  
Testing Laboratory ◽  
Drive Unit ◽  
Design Modification ◽  
Torque Moment ◽  
Ground Test ◽  
Power Testing ◽  
Small Airplanes

Aircraft Propeller Testing Laboratory of VZLÚ Praha-Letňany has taken part in a project called EPOS the development of an electric drive unit for small airplanes, with power up to 60 kW. The article describes preliminary phases of power testing of the complete propulsive unit in its first design modification on a ground test stand. The torque moment was measured using a special shaft element equipped with strain-gages.

scholarly journals Accuracy Improvement of Indoor Real-Time Location Tracking Algorithm for Smart Supermarket Based on Ultra-Wideband

2019 ◽  
Vol 33 (12) ◽  
pp. 2058004 ◽  
Author(s):  
Guohua Hu ◽  
Pascal Feldhaus ◽  
Yuwu Feng ◽  
Shengjie Wang ◽  
Juan Zheng ◽  
...  
Keyword(s):  
Real Time ◽  
Indoor Environment ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ultra Wideband ◽  
Practical Significance ◽  
Area Network ◽  
Location Tracking ◽  
Positioning Accuracy ◽  
Indoor Location

Collecting data like location information is an essential part of concepts like the “IoT” or “Industry 4.0”. In the case of the development of a precise localization system and an integrated navigation system, indoor location technology receives more and more attention and has become a hot research topic. Common indoor location techniques are mainly based on wireless local area network, radio frequency tag, ZigBee technology, Bluetooth technology, infrared technology and ultra-wideband (UWB). However, these techniques are vulnerable to various noise signals and indoor environments, and also the positioning accuracy is easily affected by the complicated indoor environment. We studied the problem of real-time location tracking based on UWB in an indoor environment in this paper. We have proposed a combinational filtering algorithm and an improved Two-Way Ranging (ITWR) method for indoor real-time location tracking. The simulation results prove that the real-time performance and high accuracy of the presented algorithm can improve location accuracy. The experiment shows that the combinational algorithm and ITWR method which are applied to the positioning and navigation of the smart supermarket, have achieved quiet good results in positioning accuracy. The average positioning error is less than 10[Formula: see text]cm, some of the improvements can elevate the positioning accuracy by 17.5%. UWB is a suitable method for indoor real-time location tracking and has important theoretic value and practical significance.

scholarly journals Ground Test Stands for Testing Rotors in Insulated Conditions

2021 ◽  
Vol 2021 (1) ◽  
pp. 15-23
Author(s):  
Małgorzata Wojtas ◽  
Łukasz Czajkowski ◽  
Kazimierz Szumański
Keyword(s):  
Test Stand ◽  
Research Network ◽  
Online Data ◽  
Basic Assumptions ◽  
Universal Test ◽  
Rotor Design ◽  
Different Types ◽  
Ground Test ◽  
Similar Solutions

Abstract The paper generally discusses Whirl Tower research stands. Whirl Tower stands are used to test, among others, rotorcrafts main rotors in hovering. The work presents an overview of similar solutions of test stand presented in the available literature and online data. Beyond these solutions the paper also contains test stands used so far at the Institute of Aviation, these solutions were prepared for testing one type of rotor (for example: only for gyroplane rotors). The article provides information about new (Whirl Tower) test stand fully designed and manufactured in Łukasiewicz Research Network ‒ Institute of Aviation (Ł-ILOT). One of the basic assumptions is that it will be a universal test stand, giving the possibility to test different types of rotors. Moreover, the article discusses the types of tests and research that can be carried out on this type of test stand, tests that are performed to ensure the safety of the rotor design.

An observer deployment algorithm for information source positioning based on Naive Bayes

2020 ◽  
Vol 31 (08) ◽  
pp. 2050115
Author(s):  
Zhang Hong ◽  
Guo Bing ◽  
Shen Yan ◽  
Shen Yun-Cheng ◽  
Duan Xu-Liang ◽  
...  
Keyword(s):  
Naive Bayes ◽  
Personal Information ◽  
Information Source ◽  
Naïve Bayes ◽  
Practical Significance ◽  
Propagation Time ◽  
Positioning Accuracy ◽  
Deployment Strategy ◽  
Data Propagation ◽  
Diffusion Source

The accurate positioning of the propagation and diffusion source points of personal information is of great practical significance for the protection of personal information security. Currently, a popular method is to locate the data diffusion source point by deploying a certain number of observers and collecting the data propagation information from observers. In view of the deployment of observers, it was found that there is an important correlation between the observer deployment location and the data propagation time delay by analyzing the relationship between the positioning accuracy of information sources and the deployment location of observers, and then an optimal deployment strategy based on Naive Bayes model (NBM) was proposed. At last, it was verified that the proposed deployment strategy can significantly improve the positioning accuracy of information source by comparing the model network with the actual network, which is of great significance for the security control of personal information propagation.

Fleet and Usage Management System (FUMSTM) Technologies for Gas Turbines

2006 ◽  
Author(s):  
Hesham Azzam ◽  
Peter Knight ◽  
Roger Ellison ◽  
Ken Bryant ◽  
Jonathan Cook ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Management System ◽  
Fleet Management ◽  
Test Bed ◽  
Engine Vibration ◽  
Ground Test ◽  
Intelligent Management ◽  
Thermal Transient ◽  
The Uk ◽  
Engine Components

Working closely with the UK Ministry of Defence (MOD), Smiths has developed a Fleet and Usage Management System (FUMS™) to enable proactive fleet management and continuous diagnostic/prognostic improvements through a single fusion and decision support platform for helicopters, aeroplanes and engines. This paper gives an overview of a suite of FUMS™ algorithms that have been successfully developed for gas turbine applications and validated using a large volume of engine data. The system has been used to analyse both airborne acquired data and ground test-bed data. The system algorithms have been targeted at evaluating the following: stresses of compressor components, thermal transient stresses of turbine components, fatigue. Total Accumulated Cycles (TAC), engine vibration, neural network based performance/degradation and, Usage Indices (UIs) that summarise engine parameters and at the same time indicate the life/condition of engine components. By operating on data from the same engine on two test-beds, the system can be used to normalise the engine vibration and reconcile any differences in vibration-based acceptance/rejection criteria: these differences can result in the acceptance of an engine for on-wing operation at one site and the rejection of the engine at another site. The paper also gives an overview of the FUMS™ intelligent management software, which has allowed the MOD to plug-in 3rd party applications. In this way, MOD can evaluate, verify and procure engine technologies developed by various suppliers and build engine applications from these technologies without the need for software re-writing.

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