TAILIEUCHUNG - Volume 102 1997 uncertainty and dimensional calibration

Tham khảo tài liệu 'volume 102 1997 uncertainty and dimensional calibration', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Volume 102 Number 6 November-December 1997 Journal of Research of the National Institute of Standards and Technology J. Res. Natl. Inst. Stand. Technol. 102 647 1997 Uncertainty and Dimensional Calibrations Volume 102 Number 6 November-December 1997 Ted Doiron and John Stoup National Institute of Standards and Technology Gaithersburg MD 20899-0001 The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer the primary requisite of an uncertainty statement is to inform the reader of how sure the writer is that the answer is in a certain range. This report explains how we have implemented these rules for dimensional calibrations of nine different types of gages gage blocks gage wires ring gages gage balls roundness standards optical flats indexing tables angle blocks and sieves. Key words angle standards calibration dimensional metrology gage blocks gages optical flats uncertainty uncertainty budget. Accepted August 18 1997 1. Introduction The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer the primary requisite of an uncertainty statement is to inform the reader of how sure the writer is that the answer is in a certain range. Perhaps the best uncertainty statement ever written was the following from Dr. C. H. Meyers reporting on his measurements of the heat capacity of ammonia We think our reported value is good to 1 part in 10 000 we are willing to bet our own money at even odds that it is correct to 2 parts in 10 000. Furthermore if by any chance our value is shown to be in error by more than 1 part in 1000 we are prepared to eat the apparatus and drink the ammonia. Unfortunately the statement did not get past the NBS Editorial Board and is only preserved .

• Cơ khí - Chế tạo máy
• Averaging
• Conservation of mass
• Multiphase flow models
• Multiphase flow notation
• distribution functions
• Dollar cost averaging
• Value averaging
• Retirement plan
• Target terminal wealth
• Value averaging investment strategies
• Impacts of investment horizon
• Weighted local averaging
• Galerkin method
• Euler column
• Free vibration
• Strong nonlinearity
• Modified averaging operator with some applications
• Vietnam Journal of Mechanics
• High order stochastic differential equations using averaging method
• High order stochastic differential equations
• Stochastic differential equations
• The fundamental work of Prof
• Higher order stochastic averaging method
• Mechanical systems having two degrees of freedom
• Mechanical systems having two degrees
• The Fokker Planck
• Two degree of freedom systems
• Non linearity on random vibrations
• The classical first prder stochastic averaging method
• Non linear random vibration systems
• Stochastic averaging method
• Bayesian model averaging
• Economic growth
• Public expenditure
• Explanatory variables included
• Economic theory
• Micro mechanical material models
• Strain softening material models
• The non local continuum theory
• Non local averaging
• Partial differential equations
• Threepoint linkage
• Lower link
• Averaging the lower link sensed forces
• Draft control
• Electro hydraulic systems
• Mechanics of solid
• Doctoral thesis on solid mechanics
• Weighted averaging approach
• Nonlinear vibration
• Bài toán dao động
• Lực tĩnh điện
• Summary of Doctoral Thesis in Solid Mechanics
• Doctoral Thesis in Solid Mechanics
• Nonlinear vibrations
• Nonlinear vibration problem
• Lecture Calculus
• Bài giảng Giải tích
• Averaging things out
• Riemann sum
• Mean value theorem
• Technologies