Showing papers on "Acceptance testing published in 1977"

Special Feature Program Testing: Art Meets Theory*

Abstract: The problems of providing quality assurance for computer software have received a good deal of attention from the computing community. Such areas as program proving, automatic programming, structured programming, and hierarchical design/development methodologies have all experienced significant growth–largely as a result of the increased attention focussed on them. Program testing, on the other hand, has not enjoyed the same level of intensive investigation, even though it has a number of technical and intuitive appeals:

Speech Quality Measurement

Abstract: : Speech quality measurement is considered from three points of view: subjective testing; objective testing; and communicability testing. Speech quality is interpreted here in terms of user acceptability. Subjective testing is considered from the philosophical perspective of iso-preference, relative preference, and absolute-preference, with isometric and parametric test methodologies, with the results of PARM and QUART as a basis. It is felt that the best approach for future subjective testing will be a parametric approach using representative male and female talkers to cover the expected range of pitch. An automated and refined version of Voiers Diagnostic Acceptability Measure (DAM) test is an attractive option. Objective testing is considered as a possible alternative to subjective testing. Reported here is a two part experimental study of the relationship between a number of objective measures and the subjective acceptability measures available from the PARM study. In the first part of the study, controlled distortions were applied to speech samples in order to measure the resolving power of the candidate objective measures on these types of distortions. In the second part, the candidate objective measures were applied to speech samples from the same systems on which PARM tests were run, and the statistical correlation between the objective and subjective measures were studied.

Power plant bottom ash in black base and bituminous surfacing. Volume 2. User's manual. Final report

Abstract: In this report, a review of the results of this and other laboratory investigations into the material and engineering properties of bottom ashes and their performance in bituminous mixtures is presented as background information for potential users of these materials Recommended guidelines for the selection of material sources, aggregate screening tests (gradation, specific gravity, density, etc), mixture design and acceptance testing based upon Marshall mix design criteria, durability tests such as immersion-compression, saturation, and freeze-and-thaw, and certain performance parameters (modulus of resilience, fatigue, rutting and fracture toughness) that may be indicative of a material's future performance in service are given Recommendations for suggested testing procedures and descriptions of these procedures are made, as well as suggestions for formulation of quality control guidelines for the production and stockpiling of bottom ash materials Potential areas for future research, particularly in the areas of bottom ash behavior in the presence of moisture and development of quality tests other than Los Angeles abrasion and sodium sulfate soundness tests, which might be more appropriate to this particular type of material, are also briefly discussed It is also recommended that freeze-and-thaw conditioning and modulus of resilience testing be considered for inclusion in aggregate screening and acceptancemore » testing programs« less

Power plant bottom ash in black base and bituminous surfacing, volume 2: user's manual

Abstract: In this report, a review of the results of this and other laboratory investigations into the material and engineering properties of bottom ashes and their performance in bituminous mixtures is presented as background information for potential users of these materials. Recommended guidelines for the selection of material sources, aggregate screening tests (gradation, specific gravity, density, etc.), mixture design and acceptance testing based upon Marshall mix design criteria, durability tests such as immersion-compression, saturation, and freeze-and-thaw, and certain performance parameters (modulus of resilience, fatigue, rutting and fracture toughness) that may be indicative of a material's future performance in service. Recommendations for suggested testing procedures and descriptions of these procedures are made, as well as suggestions for formulation of quality control guidelines for the production and stockpiling of bottom ash materials. Potential areas for future research, particularly in the areas of bottom ash behavior in the presence of moisture and development of quality tests other than Los Angeles abrasion and sodium sulfate soundness tests, which might be more appropriate to this particular type of material, are also briefly discussed. It is also recommended that freeze-and-thaw conditioning and modulus of resilience testing be considered for inclusion in aggregate screening and acceptance testing programs. /FHWA/

Acceptance Testing of a Computerized Tomographic Scanner

Abstract: Computerized tomographic scanners have gained quick and widespread acceptance in diagnostic radiological practice. The cost of such units is currently about a half million dollars. Technologically, they are one of the most complicated pieces of equipment to be found in a radiology department. Because of the cost and complexity, it seems logical to set up performance specifications, acceptance tests, and a quality assurance program for a CT scanner. Pertinent performance specifications are herein described and discussed. In order to assure that the CT unit does meet specifications, appropriate acceptance tests are likewise discussed. Finally, a basic quality assurance program is outlined with an indication of the tests to be performed and their time frequency.

Quality Control of Structural Nonmetallics.

Abstract: : Nonmetallic materials are now being used in primary structural applications, principally as advanced composites and adhesives. These resin systems are initially subjected to several years of extensive qualification testing ranging from coupon testing to the destructive testing of large substructures to establish a statistical base for design analysis and to establish environmental durability. The processability, strength and durability of any material must ultimately depend on their physical and chemical characteristics. However, most state-of-the-art adhesive and composite prepreg resin systems are proprietary in nature and are not identified as to their chemical composition. The user must rely almost entirely on performance tests such as short-term mechanical testing, flow times, etc., as a means of batch-to-batch quality control. While these performance type quality control tests have served acceptably during the introduction of these materials, the user must move toward additional quality assurance test capabilities to insure chemical consistency to that formulation which was initially qualified. During this program, chemical characterization test methods applicable to structural epoxy resin systems have been developed and the viability of these techniques for in-plant quality control and the establishment of acceptance criteria with statistically valid accept/reject limits have been demonstrated. (Author)

A Systems Approach To Acceptance Testing Of Diagnostic X-Ray Equipment

Abstract: Certification of major components of x-ray equipment by the Bureau of Radiological Health of the Food and Drug Administration has created a renewed interest in the performance of diagnostic x-ray systems. Although the certification performance criteria, major component specification data, and assembly data is submitted by the manufacturers to the Bureau of Radiological Health; assembly and calibration of the diagnostic x-ray system depends on the assembler. Even though x-ray system components exhibit certification labels, there is no guarantee that the systems meet the compliance standards. In addition to the manufacturers' specifications and HEW requirements, we have developed supplemental performance specifications. Acceptance testing of diagnostic x-ray equipment prior to final payment has been used to check that the manufacturers meet the criteria established by BRH; to check the calibration of the various x-ray systems (generator/tube, collimator, automatic exposure control, etc.); and to develop supplementary testing criteria. The performance criteria, specifications, and equipment acceptance tests, including before and after measurements for several units, will be discussed. The results will demonstrate that our desired specifications can be achieved.© (1977) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Optimal Selection of Sequential Tests for Reliability

Abstract: Reliability test requirements exist whereby truncated sequential test methods offer management the opportunity to minimize the s-expected cost of a test by optimal selection of the blend of resources that will be consumed by the test. The models presented here are useful in the real world design of reliability tests because of the ease of arriving at cost estimates and the existing availability of statistical distributional information on truncated sequential tests. The test parameters of sample size, number of spares, and duration of the test are amenable to optimization for reduction in the cost of reliability acceptance testing. When the various costs associated with the test are known, and the pdf and Sf of failures and/or time to test termination are defined, then minimum s-expected test costs are achievable. Constraints and sensitivity analysis can be applied to the models to assist the managerial decision process.

Stationary Diesel Engine-Generator Set Acceptance Testing Procedures, Methods, and Instructions.

Abstract: : The Corps of Engineers (CE) Test Procedures document has been prepared in a format similar to the referenced MIL-STD-705B test methods to provide for easy implementation by CE district and division personnel. The procedures provide for acceptance testing large diesel engine-generator sets--up to 6000 kW capacity range--intended for installation in fixed military facilities as Class A (Prime), Class B (Standby), or Class C (Emergency) electrical power generation sources. This document provides a list of MIL-STD-705B test methods which are directly applicable for acceptance testing large diesel engine-generator sets. In addition, the document provides new test procedures numbered CE-TP-1001 through 1004, designed specifically for acceptance testing large stationary diesel engine-generator sets intended for electrical power generation within fixed military facilities. (Author)

Acceptance Testing of Flying Qualities and Performance, Cockpit Motion, and Visual Display System Simulation for Flight Simulators.

Abstract: : An investigation of the techniques used by Government and industry in performing acceptance testing of flight simulators was conducted. Recommended specification languages are provided for testing three major areas of flight simulator systems; Flying Qualities and Performance simulation, Cockpit Motion simulation, and Visual Display simulation. (Author)