Compliance and stress sensitivity of spur gear teeth

The magnitude and variation of tooth pair compliance with load position affects the dynamics and loading significantly, and the tooth root stressing per load varies significantly with load position. Therefore, the recently developed time history, interactive, closed form solution for the dynamic tooth loads for both low and high contact ratio spur gears was expanded to include improved and simplified methods for calculating the compliance and stress sensitivity for three involute tooth forms as a function of load position. The compliance analysis has an improved fillet/foundation. The stress sensitivity analysis is a modified version of the Heywood method but with an improvement in the magnitude and location of the peak stress in the fillet. These improved compliance and stress sensitivity analyses are presented along with their evaluation using test, finite element, and analytic transformation results, which showed good agreement

Estimation of the parameters in exponential decontamination models

Parameter estimation in exponential decontamination model

Biostatistics of space exploration - Microbiology and sterilization Final report, 1 Sep. 1965 - 1 Sep. 1970

Statistical procedures for investigating decontamination of spacecraft and microbial assay

Evaluation of a quantal response model with variable concentrations

Estimation procedure for quantal response model of microorganism release during spacecraft impact on planet

Biostatistics of Space Exploration - Microbiology and Sterilization

Contamination probability distribution models for spacecraft - microbiological assays and sterilization of spacecraft component

Variation in measurements of microbial loads

Microbial loads of spacecraft components measured prior to heat sterilization to determine if maximum tolerance is exceede

Biostatistics and space exploration - Microbiology and sterilization

Statistical models for spacecraft sterilization and microbial growth

Dynamic tooth loads and stressing for high contact ratio spur gears

An analysis and computer program were developed for calculating the dynamic gear tooth loading and root stressing for high contact ratio gearing (HCRG) as well as LCRG. The analysis includes the effects of the variable tooth stiffness during the mesh, tooth profile modification, and gear errors. The calculation of the tooth root stressing caused by the dynamic gear tooth loads is based on a modified Heywood gear tooth stress analysis, which appears more universally applicable to both LCRG and HCRG. The computer program is presently being expanded to calculate the tooth contact stressing and PV values. Sample application of the gear program to equivalent LCRG (1.566 contact ratio) and HCRG (2.40 contact ratio) revealed the following: (1) the operating conditions and dynamic characteristics of the gear system an affect the gear tooth loading and root stressing, and therefore, life significantly; (2) the length of the profile modification affect the tooth loading and root stressing significantly, the amount depending on the applied load, speed, and contact ratio; and (3) the effect of variable tooth stiffness is small, shifting and increasing the response peaks slightly from those for constant tooth stiffness

Approximations to the Bayes estimate for a quantal assay with simple exponential tolerance distribution

Approximations to Bayes estimate for quantal assay with simple exponential tolerance distributio

Estimation for a Simple Exponential Model

Methods of parameter estimation for exponential model arising in epidemiological studies and biological assa