US4036049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining engine moment of inertia
Assignee: United States Department of the Army
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Filing: 1976-06-28
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Granted: 1977-07-19
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Expires: 1996-06-28
Abstract
Abstract A method for determining the rotational moment of inertia of an engine, crising the steps of carrying out engine deceleration tests, first with the engine unloaded and later with the engine sufficiently loaded to provide a recordable difference in deceleration rate (or elapsed time). Moment of inertia is determined as the numerical value of the added load divided by the difference in deceleration rates, before and after the load is applied.
Inventors
- 👤 Richard Eric Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:54
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A method of determining the rotational moment of inertia of an engine type power plant, comprising the steps of running an unloaded power plant up to a high speed of approximately 2500 r.p.m., de-energizing the power plant to decelerate same from said high speed to a low speed of approximately 1000 r.p.m., and measuring the elapsed time period, to thereby ascertain the average deceleration rate of the unloaded power plant; applying a known external load to the power plant; said external load being approximately 10 percent of the power plant friction torque; running the loaded power plant up to the same aforementioned high speed, de-energizing the loaded power plant to decelerate same from the aforementioned high speed to the same aforementioned low speed, and measuring the elapsed time period, to thereby ascertain the average deceleration rate of the loaded power plant; and calculating the moment of inertia according to the equation I = F A /(d 2 - d 1 ) where I is moment of inertia F A is the known external load d 2 is deceleration rate of the loaded power plant, and d.sub. 1 is deceleration rate of the unloaded power plant.
Claim 2
Independent Claim
195 words
A method of determining the rotational moment of inertia of an engine type power plant, comprising the steps of running an unloaded power plant up to a high speed of approximately 2500 r.p.m., de-energizing the power plant to decelerate same from said high speed to a low speed of approximately 1000 r.p.m., and measuring the elapsed time period, to thereby ascertain the average deceleration rate of the unloaded power plant; applying a known external load to the power plant; said external load being approximately 10 percent of the power plant friction torque; running the loaded power plant up to the same aforementioned high speed, de-energizing the loaded power plant to decelerate same from the aforementioned high speed to the same aforementioned low speed, and measuring the elapsed time period, to thereby ascertain the average deceleration rate of the loaded power plant; and calculating the moment of inertia according to the equation I = F A /(d 2 - d 1 ) where I is moment of inertia F A is the known external load d 2 is deceleration rate of the loaded power plant, and d.sub. 1 is deceleration rate of the unloaded power plant.
References Cited (Backward Citations)
US3592053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |