Dynamic modeling is the basis for predicting behavior of electro-thermal actuator (ETA). Although sequential decoupling method, often used in previous studies, has been able to model dynamics ETAs, most them focused only on ETAs themselves, and few considered effects end effectors. In this work, a dynamic multi-fields coupling considering effectors was developed. Due effector, changes from one-way coupled problem complex two-way problem, limiting commonly method. order solve thermal...

A novel self-latching MEMS optical interrupter with status monitoring is proposed to enhance the safety of laser initiation system (LIS) by preventing long-term heat accumulation and reducing response time. The electrothermal-actuated consists an fiber alignment actuator, a positive latching actuator (PLA), reverse blocking each coupled unit. PLA equipped interlock mechanism for capability. interrupter's operating state monitored using cantilever beams that function as travel switches....

MEMS safety and arming device (SAD) with merits of small size easy integration is one the most promising candidates for fuze to realize miniaturization, intelligence. In this paper, a novel inertia-driven SAD three independent features proposed. The placed perpendicular projectile axis beneficial reduce improve detonation energy transfer efficiency. dynamic finite element simulations are carried out study mechanical responses under dual-environment inertial loads. response behaviors setback...

The design, modeling, and simulation of a micro electrical switch for fuze are presented. It consists spring–mass system with zigzag slot in mass, latching connection mechanism movement-limit mechanism. keeps off-state until it is subjected to an acceleration when launched normally. simulated as half-sine pulse specific amplitude duration. dynamics model the studied. Based on methods used recognizing load established analyzed according theory. Two typical accelerations loaded simulation....

A novel micro-electro-mechanical systems (MEMS) inertial switch with universal sensitivity was investigated in this paper. Using a single circular mass, the able to detect accelerations all of radial directions hemisphere. Four suspended springs 90° symmetry were employed be compliant directions, and flexible stationary electrodes used allow for long-duration contact. More than forty prototypes produced using microfabrication process. Dynamic finite element analysis shock table experiment...

This letter reports an inertial microswitch with integrated filtering mechanism to realize acceleration band-pass characteristics. The switch is composed of a normal threshold (a high-pass mechanism) and specially designed mechanism. Only between the upper lower cut-off thresholds can make transition its `on' state. Both dynamic finite element simulations experiments were performed study behavior switch. results indicate that characteristics have been successfully achieved. bandwidth varied...

This article introduces a novel micro-optical electromechanical system safety and arming (S&A) device that utilizes both electrothermal centrifugal actuators to ensure the reliability efficiency of device. The S&A comprises pair V-shaped latching actuators, U-shaped reverse blocking actuator, alignment two sets status monitoring units. V- serve as features prevent accidental triggering, while actuator aligns optical fibers. mechanical responses under dual-environment loads are analyzed using...

Abstract This paper proposes an innovation microfluidic inertial switch structure with precise time delay response characteristic, which can be used in the fuze safety and arming system. The works on principle of fluidic force capillary valve, makes it sensitive to unidirection acceleration load has ability recognize amplitude. a J-shaped reservoir, valves, serpentine microchannel U-shaped latching microchannel. threshold is analyzed theoretically considering surface tension coefficient...

A preliminary theoretical method for calculating contact time of a dual mass-spring system applied to shock acceleration was proposed based on the MEMS omnidirectional inertial switch. The influence relevant parameters analyzed, and results were in agreement with simulation predictions. could provide design switch prolonged time. stiffness all directions obtained by using FE method. Dynamic typical under indicate that has within range 33 μ s 95 an enhanced effect fabricated switches tested...

UGS (Unattended Ground System) has been proved to be effective in target real-defection, identification. This paper discusses data acquisition by seismic sensors and how extract features from the signal produced a vehicle. ANN (artificial neural network) is robust classifier pattern recognition, especially property of ART self-learning very suitable emergence battlefield, therefore this presents method identification ANN. A satisfactory experiment result obtained after simulation.

In this paper, a band pass setback arming mechanism of the MEMS Safety and Arming Device (SAD) is proposed. It used to lock movement U-shape electro-thermal actuator until conditions have been met capable dual threshold (acceleration amplitude pulse width) recognition. The recognition boundary has determined, only if acted by load within boundary, can latch be locked released. Mathematic model established according structural dynamics theory Castigliano's second theorem. numerical solution...

A theoretical model for the acceleration bandpass inertial microswitch was proposed, considering coupling of a slender bar with an offset lumped mass (filter mechanism) and mass-spring system (movable electrode). It is revealed by solving that only impact loads between upper lower cutoff thresholds can make switch turn to ``on'' state. Besides, parametric analysis on both single double design variables performed characteristic, accordingly, effect characteristic studied in detail. Thus,...

AbstractA piezoelectric generator is proposed in this paper that transforms aerodynamic energy to electrical energy. This new transducer takes a structure of resonant cavity and cantilever beams, which stimulated by airflow when projectile flight. The beams are covered with thin films. When the stimulating frequency equal or approximate cantilever, higher voltage would be produced. Analysis simulation has been done based on finite elements method. optimises pneumatic unit whole generator....

A MEMS omnidirectional inertial switch was designed and fabricated based on non-silicon surface micromachining technology. The consists of mass-spring system, flexible radial electrodes axial electrode. It has sensitivities in a half sphere. modal analysis the performed. system stiffness response displacement mass all directions under applied shock acceleration 450g obtained by using FE method, as result, good performance small distributed threshold acceleration. switches were tested test...