Development and demonstration of INSTAR: inertially stabilized rifle

Brei, Diann; Vendlinski, James; Lindner, Douglas K.; Zhu, Huiyu; LaVigna, Chris

doi:10.1117/12.483457

Cited by 7 publications

(7 citation statements)

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“…The performance of this algorithm was demonstrated using the actuator specifications from the Intertially Stablized Rifle (Brei et al 2003). The design specifications are given in table 2.…”

Section: Resultsmentioning

confidence: 99%

Design of a recurve actuator for maximum energy efficiency

Seresta¹,

Ragon²,

Abdalla³

et al. 2006

Smart Mater. Struct.

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In this paper we study the optimal design of recurve arrays. An analytic model of the static response of the recurve actuator with energy flow in the system is derived. Two optimization problems for the recurve array are formulated with material, packaging, and performance constraints. One formulation is based on minimum weight. The second formulation is based on energy efficiency. A genetic algorithm is used to find the optimum designs. Recurve arrays designed for maximum energy conversion efficiency are compared to those designed for minimum weight. Parametric studies are conducted to investigate the effect of the stiffness of the driven structure and the maximum deliverable voltage on the optimized designs. These optimization formulations are effective design tools for a relatively complex actuator.

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Section: Resultsmentioning

confidence: 99%

Design of a recurve actuator for maximum energy efficiency

Seresta¹,

Ragon²,

Abdalla³

et al. 2006

Smart Mater. Struct.

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“…The plant is a mathematical model that fully captures the dynamics of the rifle while taking into consideration the rifle's response to human interaction. Equations will be used to develop the plant model since these equations fully describe the motions of the rifle being shot by a human in a stationary position [2] Figure (1): Generic model of a rifle with active stabilization system (Brei et. al, 2003) Figure(1) is a generic dynamic rifle model.…”

Section: Mathematical Modelmentioning

confidence: 99%

Design of Active Stabilization Controller for a Tactical Rifle

Elnashar

Mohamed

2010

The International Conference on Electrical Engineering

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This paper describes an inertial stabilized rifle where a recurve actuator, constructed from piezoelectric material, is used to internially stabilize the barrel assembly of a tactical rifle to compensate for the small user-induced disturbances. This system is an active stabilization system designed to decouple the shooter's interruption effects from the barrel movement based on control systems. Based on the feedback of the targeting error from the sensors, a control system will calculate the desired displacement and force needed to cancel out the human disturbances that are imparted to the rifle. The actuators are designed to cancel out jitter disturbances in a frequency range of 0Hz-5Hz It presents research to help protect and increase the defenses of soldiers on ground. While in battle these soldiers' defenses and performance suffer due the intense stressors of combat. A different method for mitigating the depredating physiological effects of a soldier's marksmanship due to battle stressors can be achieved through the design and implementation of active stabilization system for small arms weapons. Combat stress may be defined as the perception of an imminent threat of serious personal injury or death, or the stress of being tasked with the responsibility to protect another party from imminent and serious injury or death, under conditions where response time is minimal. Physiological effects that result from combat include, but are not limited to, a dramatic increase in heart rate, heavy breathing, muscle tremors, and anxiety.The requirements of this system are discussed and the actuator controller are derived. This research uses pole-placement control techniques to develop control algorithms for simulation. The level of performance for the control algorithm is based on how well measure up to the criteria developed from the rifle.

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“…Under the DARPA CHAP program, the INertially STAbilized Rifle (INSTAR) project sought to compensate for wobble via an active suspension system between the stock and the barrel on sniper rifles. The INSTAR was successfully demonstrated on the benchtop [7,8] to produce the necessary actuation authority needed to reduce human wobble and thereby increase shooting accuracy; however, the device was not fielded due to concerns of the piezoelectric actuator's ability to withstand the rough loading and harsh environments (water, dirt, extreme temperatures, etc.) seen in combat along with the overall weight and size of the actuation system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characterization and single-frequency cancellation performance of SMASH (SMA actuated stabilizing handgrip)

et al. 2008

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In urban combat environments where it is common to have unsupported firing positions, wobble significantly decreases shooting accuracy reducing mission effectiveness and soldier survivability. The SMASH (SMA Stabilizing Handgrip) has been developed to cancel wobble using antagonistic SMA actuators which reduce weight and size relative to conventional actuation, but lead to interesting control challenges. This paper presents the specification and design of the SMA actuation system for the SMASH platform along with experimental validation of the actuation and cancellation authority on the benchtop and on an M16 platform. Analytical dynamic weapon models and shooter experiments were conducted to define actuation frequency and amplitude specifications. The SMASH, designed to meet these, was experimentally characterized from the bounding quasi-static case up to the 3 Hz range, successfully generating the ±2 mm amplitude requirement. To effectively cancel wobble it is critical to produce the proper output functional shape which is difficult for SMA due to inherent nonlinearities, hysteresis, etc. Three distinct electrical heating input functions (square, ramp, and preheat) were investigated to shape the actuator output to produce smooth sinusoidal motion. The effect of each of these functions on the cancellation response of the SMASH applied to the M16 platform was experimentally studied across the wobble range (1-3 Hz) demonstrating significant cancellation, between 50-97% depending on the smoothing function and frequency. These results demonstrate the feasibility of a hand-held wobble cancellation device providing an important foundation for future work in overall system optimization and the development of physically based feed-forward signals for closed-loop control.

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Development and demonstration of INSTAR: inertially stabilized rifle

Cited by 7 publications

References 0 publications

Design of a recurve actuator for maximum energy efficiency

Design of a recurve actuator for maximum energy efficiency

Design of Active Stabilization Controller for a Tactical Rifle

Dynamic characterization and single-frequency cancellation performance of SMASH (SMA actuated stabilizing handgrip)

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