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Thermomechanical Compensation for Thermal Shift

IP.com Disclosure Number: IPCOM000081525D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Ellis, SG: AUTHOR

Abstract

Fig. 1 shows member 1 attached to member 2 by standoffs 3 and 4. Member 2 is affected by temperature variations such that when the temperature rises above the nominal temperature, member 2 experiences a bending action. Assuming that member 1 and standoffs 3 and 4 are not affected by the temperature variations, member 1 will experience a tilting action in response to the bending of member 2. This bending action and the degree of tilt is shown in Fig. 2 and the angle of tilt is shown by angle phi.

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Thermomechanical Compensation for Thermal Shift

Fig. 1 shows member 1 attached to member 2 by standoffs 3 and 4. Member 2 is affected by temperature variations such that when the temperature rises above the nominal temperature, member 2 experiences a bending action. Assuming that member 1 and standoffs 3 and 4 are not affected by the temperature variations, member 1 will experience a tilting action in response to the bending of member 2. This bending action and the degree of tilt is shown in Fig. 2 and the angle of tilt is shown by angle phi.

In order to maintain member 1 at a fixed position even though member 2 experiences the bending action, some compensation must be introduced into the system to correct for the error introduced by the bending of member 2.

With regard to Fig. 3, it can be seen that if member 2 was assumed not to be affected by temperature but that standoffs 3 and 4 were affected by temperature, the temperature coefficient of expansion associated with standoffs 3 and 4 could be selected to cause member 1 to effectively see a tilting action in the opposite direction, but of the same degree as seen in Fig. 2 for the same temperature gradient.

It therefore can be realized that if the material selected in Fig. 3 were substituted into the system shown in Fig. 1 for the standoffs 3 and 4, that when member 2 experiences a bending action due to temperature rise, that the change in length of members 3 and 4 would compensate for this bending action, and m...