Ultrasonic Missile Defense Triggering Piezoelectric Detonators
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Solution Overview
Problem
Current defense systems against missiles with piezoelectric detonators are either ineffective, expensive, or unsuitable for close-range engagements, as they rely on armor, active shooting systems with low hit probabilities, or microwave energy that is shielded by the missile's metal casing.
Innovation Solution
The method involves emitting ultrasonic radiation to trigger the piezoelectric detonator of incoming missiles, using phased-array ultrasonic transducers to align and focus the energy electronically or mechanically, ensuring the detonator is activated before the missile reaches the target, thereby preventing destructive plasma jets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If armor is used to defend against missiles, then protection against direct hits is improved, but protection against shaped charge plasma beams deteriorates
Solution Approach 1:
The system performs preliminary action by triggering the missile's detonator before the missile reaches the target. The ultrasonic beam excites the piezoelectric detonator at its resonant frequency, causing the explosive payload to detonate in flight rather than upon impact, thereby eliminating the plasma beam threat before it can affect the protected object.
2Reliability
If active defense systems are used to shoot down missiles, then direct hits are prevented, but cost and complexity increase significantly
Solution Approach 1:
The invention replaces complex mechanical shooting-down systems with a simpler acoustic field-based approach. Instead of using projectile interceptors or complex kinetic energy weapons, the system uses ultrasonic radiation to remotely trigger the missile's own detonator, achieving missile neutralization with a fundamentally simpler and less expensive system architecture.
Solution Approach 2:
The ultrasonic beam serves as an intermediary that transfers energy from the defense system to the missile's piezoelectric detonator without requiring direct physical contact or complex interception mechanisms. The ultrasonic energy acts as a mediator that remotely activates the explosive payload, enabling defense with simplified equipment.
3Object-affected harmful factors
If microwave energy is used to penetrate missile shielding, then electromagnetic radiation effectiveness is improved, but power requirements increase extremely
Solution Approach 1:
The system changes the physical parameter of the radiation from electromagnetic (microwave) to acoustic (ultrasonic). This parameter change allows penetration of the metal casing with much lower energy requirements, as ultrasonic waves can pass through metal with only slight attenuation, eliminating the need for extreme power levels required by microwave systems.
4Reliability
If ultrasonic radiation is used to trigger detonators, then reliability of defense is improved, but precision in frequency matching is required
Solution Approach 1:
The system applies dynamic frequency modulation to the ultrasonic beam, sweeping through a frequency range to locate and excite the resonant frequency of the piezoelectric detonator. This dynamic approach compensates for manufacturing tolerances and uncertainties in the exact resonant frequency, maintaining high reliability without requiring extreme manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a reliable and cost-effective defense against guided and unguided missiles by triggering the explosive payload before impact, avoiding direct hits and plasma formation near the target, with a short reaction time suitable for close-range bombardments.
Implementation Method 1
Piezoelectric sensors are frequently used as percussion detonators for triggering explosive payloads in unguided missiles
Implementation Method 2
The frequency of the ultrasonic radiation is preferably chosen so that the piezoelectric detonator of the incoming missile is excited at its natural resonant frequency or a harmonic or subharmonic thereof
Implementation Method 3
an array of several ultrasonic transducers is preferred, which permits the emitted energy to be aligned by appropriate phase control of the signals of the individual ultrasonic transducers (phased-array technique)
Implementation Method 4
The emitted ultrasonic radiation, which can be directed or undirected can penetrate the metal casing of the missile with only slight attenuation
Implementation Method 5
the Doppler shift that occurs due to the relative speeds of the missile and the platform transmitting the ultrasonic radiation can also be advantageously taken into account in the choice of emitted ultrasonic frequency
Data Source
AI summary
In a method and apparatus for defense against missiles that have explosive substances and piezoelectric detonators, the detonator of the missile is excited by ultrasonic radiation, causing it to oscillate and thus be triggered in flight.