Protection From External Heat
Pressure transducers are sensitive to their external environment and often are protected by heat shields or insulation. The pressure transducers shown on figure 4 have been covered with zinc chromate putty to protect them from external heat so that their accuracy will not be impaired. As reported in reference 38, even sunshine on the transducer housing can cause a thermal gradient sufficient to produce a measurable error. For commonly employed strain-gage transducers, about a 1-percent change...
References
1. Cingo, R. P. A Rapid Method of Evaluating Thrust Stand Dynamic Response. CPIA No. 58A, ICRPG Solid Propellant Rocket Static Test Working Group, Addendum to Bulletin of the 2nd Meeting, Sept. 1964, p. 91. 2. Anon. HIBEX Development, January 1964 September 1965 U . Dev. 6164, Hercules Powder Co., ABL Cumberland, Md. . Unpublished, pp. 11-10, 11 figure II-1A. Confidential 3. Anon. 1965 Production Support Program Final Report U . BSD TR-361, Vol. I, Hercules, Inc., June 1967, pp. 4-60....
Test Stand Alignment
Motor thrust can be measured accurately only when the motor and thrust stand, including all supports, are precisely aligned. Measured thrust is equal to actual thrust times the cosine of the angle of misalignment. Slight misalignment of only the forward thrust vector has produced small errors. For example, if the forward thrust vector is misaligned by the fairly large angle of 2 34' the inaccuracy in thrust measurement will be about one-tenth of 1 percent for a relatively large misalignment of...
Alignment
When strain data are to be used to calculate stresses, two gages are employed if the directions of the principal stresses are known. Figure 26 shows seven pairs of Figure 25. Common locations for linear potentiometers and strain gages on filament-wound chamber during testing. Figure 25. Common locations for linear potentiometers and strain gages on filament-wound chamber during testing. Figure 26. Strain gages on a motor chamber. strain gages attached to a glass-filament-wound motor chamber...
Introduction
Many tests are used for the evaluation of a solid rocket motor. Excluding flight tests, the most significant test is the captive firing of the complete motor. This monograph is restricted to consideration of testing by captive firing. The term captive-fired testing, as used in this monograph, refers to static-fired, spin-fired, or centrifuge-fired testing of a complete solid propellant rocket motor to verify design and to measure performance. Such testing may require that design provisions be...