A miniature, gun-hard MEMS IMU for guided projectiles, rockets and missiles

Scaysbrook, I.; Cooper, S. J.; Whitley, E.T.

doi:10.1109/plans.2004.1308970

Cited by 9 publications

(6 citation statements)

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“…Extraction of minerals Oil, gas 20,000 g [49] Shock test Split Hopkinson pressure bar 5000 g-150,000 g [50] Military application Firearm 23,000 g [51] Ammunition tank, artillery, mortar installations 10,000 g-100,000 g [52] Flight of ammunition from tank, artillery, mortar weapons 0.5 g-20 g [53] The form of the shock pulse is the dependence of the shock acceleration on time a(t), shown in Figure 7. When calculating the impact form of the shock pulse to simplify idealize, replacing it with a suitable simpler form: rectangular, triangular, semi-sinusoidal, as shown in Figure 8.…”

Section: Shockmentioning

confidence: 99%

The Mechanical Effects Influencing on the Design of RF MEMS Switches

et al. 2020

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Radio-frequency switches manufactured by microelectromechanical systems technology are now widely used in aerospace systems and other mobile installations for various purposes. In these operating conditions, these devices are often exposed to intense mechanical environmental influences that have a strong impact on their operation. These negative effects can lead to unwanted short-circuit or open-circuit in the radio-frequency transmission line or to irreversible damage to structural elements. Such a violation in the operation of radio-frequency microelectromechanical switches leads to errors and improper functioning of the electronic equipment in which they are integrated. Thus, this review is devoted to the analysis of the origin of these negative intense mechanical effects of the environment, their classification, and analysis, as well as a review of methods to reduce or prevent their negative impact on the design of radio-frequency microelectromechanical switches.

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Section: Shockmentioning

confidence: 99%

The Mechanical Effects Influencing on the Design of RF MEMS Switches

et al. 2020

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“…Accelerometers are sensors that measure specific force and gyros are sensors that measure the angular rate of rotation. MEMS IMU has wide application to precision-guided weapons [1,2], ship and aircraft navigation [3,4,5], human body orientation estimation [6,7,8,9], smart phones [10], satellite positioning systems [11,12], and so forth. Currently, there is a higher demand for inertial measurement devices in various fields, requiring higher measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Attitude Measurement for High-Spinning Projectile with a Hollow MEMS IMU Consisting of Multiple Accelerometers and Gyros

Liu

Zhao

et al. 2019

Sensors

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A low cost, high precision hollow structure MEMS IMU has been developed to measure the roll angular rate of a high-spinning projectile. The hollow MEMS IMU is realized by designing the scheme of non-centroid configuration of multiple accelerometers. Two dual-axis accelerometers are respectively mounted on the pitch axis and the yaw axis away from the center of mass of the high-spinning projectile. Three single-axis gyros are mounted orthogonal to each other to measure the angular rates, respectively. The roll gyro is not only used to judge the spinning direction, but also to measure and compensate for the low rotation speed of the high-spinning projectile. In order to improve the measurement accuracy of the sensor, the sensor output error is modeled and calibrated by the least square method. By analyzing the influence of noise statistical characteristics on angular rate solution accuracy, an adaptive unscented Kalman filter (AUKF) algorithm is proposed, which has a higher estimation accuracy than UKF algorithm. The feasibility of the method is verified by numerical simulation. By using the MEMS IMU device to build a semi-physical simulation platform, the solution accuracy of the angular rate is analyzed by simulating different rotation speeds of the projectile. Finally, the flight test is carried out on the rocket projectile with the hollow MEMS IMU. The test results show that the hollow MEMS IMU is reasonable and feasible, and it can calculate the roll angular rate in real time. Therefore, the hollow MEMS IMU designed in this paper has certain engineering application value for high-spinning projectiles.

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“…Microelectromechanical systems (MEMS) tuning fork gyroscopes have the advantages of low cost and high integration, and thus are widely used in various categories such as consumer electronics, automobiles, precision munitions, and artilleries [1,2,3,4]. When used in precision munitions and artilleries, the survival of a MEMS tuning fork gyroscope under the shock of a gun launch is concerned.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Displacement Constraints on the Failure of MEMS Tuning Fork Gyroscopes under Shock Impact

Lian

2019

Micromachines

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Displacement constraints such as stops are widely used in engineering to improve the shock resistance of microelectromechanical system (MEMS) tuning fork gyroscopes. However, in practical applications, it has been found that unexpected breakage can occur on MEMS tuning fork gyroscopes with stops. In this paper, the effects of two displacement constraints on the failure mode of MEMS tuning fork gyroscopes are studied. The MEMS tuning fork gyroscope is simplified to a two-degree-of-freedom (2DOF) model, then finite element analysis (FEA) is used to study the effects of displacement constraint on the gyroscope. The analysis proves that even if the displacement constraint of direct contact with the weak connecting beam is not established, the equivalent stiffness of the gyroscope can be enhanced by limiting the displacement of the movable mass, thereby improving the shock resistance of the gyroscope. However, under the shock of high-g level, displacement constraint with insufficient spacing will cause multiple collisions of the small-stiffness oscillating frame and lead to an increase in stress. The cause of failure and shock resistance of a MEMS tuning fork gyroscope are verified by the shock test. By comparing the results, we can get a conclusion that is consistent with the theoretical analysis.

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A miniature, gun-hard MEMS IMU for guided projectiles, rockets and missiles

Cited by 9 publications

References 0 publications

The Mechanical Effects Influencing on the Design of RF MEMS Switches

The Mechanical Effects Influencing on the Design of RF MEMS Switches

Attitude Measurement for High-Spinning Projectile with a Hollow MEMS IMU Consisting of Multiple Accelerometers and Gyros

The Effect of Displacement Constraints on the Failure of MEMS Tuning Fork Gyroscopes under Shock Impact

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