Uncertainity Analysis for the Fiducial Calibration System

2005 ◽  
Author(s):  
Bethany A. Woody ◽  
K. Scott Smith ◽  
Robert J. Hocken ◽  
Jimmie A. Miller
Keyword(s):  
Uncertainty Analysis ◽  
Shop Floor ◽  
Calibration System ◽  
Finished Part ◽  
Number Of Factors ◽  
Time Required ◽  
First Time

Previous work has established the Fiducial Calibration System (FCS), a technique, which, for the first time provides a method that allows for the accuracy of a CMM to be transferred to the shop floor. This paper addresses the range of applicability of the FCS, and provides a method to answer two fundamental questions. First, given a set of machines and fiducials, how much improvement in precision of the finished part can be expected? And second, given a desired precision of the finished part, what machines and fiducials are required? The achievable improvement in precision using the FCS depends on a number of factors including, but not limited to: the type of fiducial, the probing system on the machine and CMM, the time required to make a measurement, and the frequency of measurement. In this paper, the sensitivity of the method to such items is evaluated through an uncertainty analysis, and examples are given indicating how this analysis can be used in a variety of cases.

Establishment of 40,000 A Rogowski coil calibration system and its uncertainty analysis

CPEM 2010 ◽  
2010 ◽  
Author(s):  
Yoon Hyoung Kim ◽  
Jae Kap Jung ◽  
Jeon Hong Kang ◽  
Sang Hwa Lee ◽  
Sang Ok Han
Keyword(s):  
Uncertainty Analysis ◽  
Rogowski Coil ◽  
Calibration System

scholarly journals Principal Component Gradiometer technique for removal of spacecraft-generated disturbances from magnetic field data

2020 ◽  
Author(s):  
Ovidiu Dragoş Constantinescu ◽  
Hans-Ulrich Auster ◽  
Magda Delva ◽  
Olaf Hillenmaier ◽  
Werner Magnes ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Principal Component ◽  
Field Measurements ◽  
Magnetic Field Data ◽  
Service Oriented ◽  
Sensor Configuration ◽  
Time Required ◽  
First Time ◽  
The Magnetic Field

Abstract. In situ measurement of the magnetic field using space borne instruments requires either a magnetically clean platform and/or a very long boom for accommodating magnetometer sensors at a large distance from the spacecraft body. This significantly drives up the costs and time required to build a spacecraft. Here we present an alternative sensor configuration and an algorithm allowing for ulterior removal of the spacecraft generated disturbances from the magnetic field measurements, thus lessening the need for a magnetic cleanliness program and allowing for shorter boom length. The proposed algorithm is applied to the Service Oriented Spacecraft Magnetometer (SOSMAG) onboard the Korean geostationary satellite GeoKompsat-2A (GK2A) which uses for the first time a multi-sensor configuration for onboard data cleaning. The successful elimination of disturbances originating from several sources validates the proposed cleaning technique.

A Technique for Enhancing Machine Tool Accuracy by Transferring the Metrology Reference From the Machine Tool to the Workpiece

2006 ◽  
Vol 129 (3) ◽  
pp. 636-643 ◽  
Author(s):  
Bethany A. Woody ◽  
K. Scott Smith ◽  
Robert J. Hocken ◽  
Jimmie A. Miller
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
High Speed ◽  
Large Scale ◽  
Thermal Environment ◽  
Coordinate Measuring Machine ◽  
Shop Floor ◽  
Finished Part ◽  
Measuring Machine ◽  
Monolithic Components

High-speed machining (HSM) has had a large impact on the design and fabrication of aerospace parts and HSM techniques have been used to improve the quality of conventionally machined parts as well. Initially, the trend toward HSM of monolithic parts was focused on small parts, where existing machine tools have sufficient precision to machine the required features. But, as the technology continues to progress, the scale of monolithic parts has continued to grow. However, the growth of such parts has become limited by the inability of existing machines to achieve the tolerances required for assembly due to the long-range accuracy and the thermal environment of most machine tools. Increasing part size without decreasing the tolerances using existing technology requires very large and very accurate machines in a tightly controlled thermal environment. As a result, new techniques are needed to precisely and accurately manufacture large scale monolithic components. Previous work has established the fiducial calibration system (FCS), a technique, which, for the first time provides a method that allows for the accuracy of a coordinate measuring machine (CMM) to be transferred to the shop floor. This paper addresses the range of applicability of the FCS, and provides a method to answer two fundamental questions. First, given a set of machines and fiducials, how much improvement in precision of the finished part can be expected? And second, given a desired precision of the finished part, what machines and fiducials are required? The achievable improvement in precision using the FCS depends on a number of factors including, but not limited to: the type of fiducial, the probing system on the machine and CMM, the time required to make a measurement, and the frequency of measurement. In this paper, the sensitivity of the method to such items is evaluated through an uncertainty analysis, and examples are given indicating how this analysis can be used in a variety of cases.

Ensuring Reliability in Lean New Product Development

2011 ◽  
Author(s):  
John J. Paschkewitz
Keyword(s):  
Product Development ◽  
New Product Development ◽  
Lean Manufacturing ◽  
New Product ◽  
Shop Floor ◽  
Design Decisions ◽  
Lean Product Development ◽  
Critical Characteristics ◽  
Reliability And Robustness ◽  
First Time

Many companies have begun their lean journey. This typically begins on the shop floor with lean manufacturing methods. This soon leads to applying lean to other processes including new product development. Lean New Product Development (Lean NPD) creates value and eliminates waste by creating knowledge up front to enable informed design decisions and eliminate rework loops. From a quality and reliability perspective, this should be viewed positively because it offers the opportunity to do what is needed up front to ensure robust and reliable products. This paper provides an introduction to Lean NPD and shows how it can be applied to reliability needs definition, design decisions, risk assessment and mitigation, critical characteristics and process control, product testing, failure analysis and corrective action to improve product reliability and robustness. Lean product development changes the focus of how design and development are done, and reliability and robustness tasks are part of the up front knowledge development that facilitates better decisions to get the product right the first time and eliminate the waste of rework and repeated development loops.

Human Factors in Spacelab: Crew Training

1983 ◽  
Vol 27 (7) ◽  
pp. 552-556
Author(s):  
Maria K. Junge
Keyword(s):  
Human Factors ◽  
Life Sciences ◽  
Space Environment ◽  
Flight Crew ◽  
Successful Completion ◽  
Nasa Ames Research ◽  
Task Training ◽  
Time Required ◽  
Mission Simulation ◽  
First Time

At NASA-Ames Research Center's Life Sciences Flight Experiments Project Office two payloads for the Shuttle Spacelab are currently in development. The first payload, Spacelab-3, will launch in November 1984. Unique life sciences hardware designed to support animals in 0-g will fly for the first time. Flight crew training sessions for the Spacelab-3 astronauts began in June 1982. Human factors involvement is extensive. A thorough understanding of both the 1-g and 0-g environments is necessary. The weightlessness of the space environment creates special conditions; e.g., the time required for a 1-g laboratory experiment significantly increases in 0-g. The transportation of objects in 0-g uses different techniques than on Earth. These considerations, plus others, are incorporated into the design of the Spacelab-3 crew training program. The training begins with payload orientation sessions and then progresses to hardware and experiment task training. After successful completion of task training, the crew participates in phase training which is a full-up mission simulation. Refresher and proficiency training is conducted at appropriate intervals. Throughout the crew training sessions the flight crew has input into the flight procedures and any “crew factors” hardware modifications as needed.

scholarly journals Memahami Investasi Minyak Cina di Sudan: Analisis Interaksi Strategis Cina pada Situasi Konflik

2017 ◽  
Vol 13 (2) ◽  
pp. 119
Author(s):  
Fajar Ajie Setiawan
Keyword(s):  
Economic Growth ◽  
Economic Development ◽  
Foreign Policy ◽  
Uncertainty Analysis ◽  
Strategic Interaction ◽  
Domestic Production ◽  
Vital Interest ◽  
China’S Foreign Policy ◽  
First Time

<p class="Abstrak" align="center"> </p><p class="Abstrak" align="center"> </p><p class="Abstrak"><strong>Abstrak</strong></p><p class="Abstrak">Perkembangan pesat perekonomian Cina khususnya dalam dua dekade terakhir mendorong tingginya ketergantungan Cina akan impor minyak bumi melebihi kapasitas produksi domestiknya. Cina untuk pertama kalinya melewati Amerika Serikat sebagai importir minyak terbesar di dunia pada tahun 2015 dengan kawasan Afrika khususnya negara-negara ‘bermasalah’ seperti Sudan menjadi tujuannya. Investasi berbasis minyak Cina di Sudan kemudian menjadi perhatian dunia internasional karena kebijakan non-interferensi Cina dianggap tidak memedulikan permasalahan domestik Sudan. Penelitian ini berupaya untuk menjelaskan bagaimana investasi berbasis minyak Cina di Sudan dengan fokus analisis terhadap interaksi strategis antar negara yaitu Cina dengan Sudan yang dilanda konflik dengan menggunakan tiga variabel analisis yaitu kepentingan negara, spesifikasi setting strategis, dan perhatian terhadap faktor ketidakpastian. Hasil analisis memperlihatkan bahwa kebutuhan minyak sebagai penggerak pertumbuhan ekonomi Cina merupakan kepentingan krusial sehingga menjadi prioritas yang dijalankan oleh SOEs Cina sebagai instrumen strategis berdasarkan kebijakan “China First” yang permisif terhadap isu domestik.</p><p class="Abstrak"> <strong>Kata Kunci</strong>: investasi minyak; politik luar negeri cina; konflik sudan; ekonomi politik internasional</p><p class="Abstrak"><strong>Abstract</strong></p><p class="Abstrak" align="center"> </p><p class="Abstrak">The rapid economic development of PRC especially during the last two decades has prompted its dependence on oil imports exceeding its domestic production. China for the first time exceeded US as the biggest oil importer in 2015 with Africa particularly ‘troubled’ countries such as Sudan as its destination. China’s oil-based investment in Sudan later becomes international concern since China’s non-interference policy was perceived as ignoring Sudan’s domestic problems. This research attempts to explain China’s oil-based investment in Sudan with focus of analysis on China’s strategic interaction with conflict-troubled Sudan using three analytical variables: the identification of state interest, the specification of strategic setting, and the attention to the role of uncertainty. Analysis result shows that China’s need for oil to secure its economic growth is China’s vital interest as being prioritized by its SOEs as China’s strategic instrument based on ‘China First’ policy that is permissive towards Sudan’s domestic issue.</p><p class="Abstrak"><strong>Keywords</strong>: oil investment; china’s foreign policy; sudan conflict; IPE</p>

scholarly journals TACTICS OF PSYCHOLOGICAL TESTING AND PSYCHOTHERAPY OF SLEEP DISORDERS DURING THE COVID-19 PANDEMIC

2021 ◽  
Vol 9 (3) ◽  
pp. 259-276
Author(s):  
A.I. Melehin ◽  
Keyword(s):  
Cognitive Behavioral Therapy ◽  
Sleep Disorders ◽  
Mental State ◽  
Behavioral Therapy ◽  
Health Anxiety ◽  
Cognitive Behavioral ◽  
Number Of Factors ◽  
The Moment ◽  
First Time ◽  
The Relationship

Due to the high prevalence of sleep disorders during the second and third waves, the question of the relationship between the incidence of coronavirus, acute respiratory distress syndrome and sleep is still open. The article describes for the first time the specifics of the phenomenon of COVID-SOMNIA or covid-associated sleep disorders, which includes a spectrum of changes in sleep from insomnia, restless legs syndrome to behavior disorders during the REM sleep phase. Various effects of COVID-19 on sleep disorders in patients have been shown. Different infections have different effects on the mental state and on a person’s sleep — these are sleep disorders caused by viral load. Specific clinical and psychological manifestations of covid-associated sleep disorders are described. For the first time in Russia, a model of the relationship between covid-associated anxiety, insomnia and suicidal thinking is presented. The psychological factors influencing the occurrence of the phenomenon of COVID-somnia in patients are systematized. It is shown that the risks of developing insomnia during the COVID-19 pandemic consist of the presence of a number of factors in the patient: tolerance to uncertainty, covid-associated anxiety, feelings of loneliness, the presence of symptoms of depression and anxiety earlier and at the moment. For clinical psychologists, the general tactics of psychological examination of an infected patient who has undergone COVID-19, who have post-ovoid syndrome in the presence of changes in the mental state and quality of sleep are described. In short, the protocols of remote cognitive behavioral therapy of anxiety associated with the COVID-19 pandemic are based on a psychological model of health anxiety and hypochondria (somatosensory amlification). It is recommended that we use cognitive refocusing therapy for insomnia (cognitive refocusing treatment) and a protocol for short-term remote cognitive behavioral therapy of anxiety associated with the COVID-19 pandemic in everyday clinical practice.

scholarly journals Role of angiostatins in diabetic complications

2015 ◽  
Vol 61 (1) ◽  
pp. 41-56 ◽  
Author(s):  
A.A. Tykhomyrov ◽  
S.I. Shram ◽  
T.V. Grinenko
Keyword(s):  
Diabetes Mellitus ◽  
Cardiovascular Diseases ◽  
Diabetic Complications ◽  
Causative Factor ◽  
Vascular Abnormalities ◽  
Number Of Factors ◽  
First Time ◽  
Review Current ◽  
Diagnostics And Therapy

Angiogenesis is a process through which new blood vessels form from pre-existing vessels. Angiogenesis is regulated by a number of factors of peptide nature. Disbalance of angiogenic system appears to be the major causative factor contributing vascular abnormalities in diabetes mellitus, resulting in various complications. Angiostatins, which are kringle-containing fragments of plasminogen/plasmin, are known to be powerful physiological inhibitors of neovascularization. In the present review, current literature data on peculiarities of production of angiostatins and their functioning at diabetes mellitus are summarized and analyzed for the first time. Also, role of angiostatins in the pathogenesis of typical diabetic complications, including retinopathies, nephropathies and cardiovascular diseases, is discussed. Data presented in this review may be useful for elaboration of novel effective approaches for diagnostics and therapy of vascular abnormalities in diabetes mellitus.

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