UAV Power Unit Mounting Layout for Engine Vibration Isolation
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Solution Overview
Problem
Existing UAV power units face issues with excessive vibrations, weight distribution, and reduced flight duration due to inefficient vibration isolation and integration of internal combustion engines and electrical generators, leading to stability and controllability problems.
Innovation Solution
A power unit configuration with a vibration-isolating assembly that combines an internal combustion engine and an electrical generator on a shared output shaft, featuring a muffler for noise reduction and heat dissipation, along with a balanced arrangement of a battery and fuel tank to minimize weight and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an internal combustion engine is used to ensure high power and long-duration flight, then power and flight duration are improved, but vibrations and noise increase
Solution Approach 1:
A vibration-isolating assembly is introduced as an intermediary element between the internal combustion engine and the UAV fuselage. This assembly includes vibration dampeners and isolating structures that absorb and reduce engine vibrations before they are transmitted to the fuselage, thereby maintaining the power benefits of the ICE while mitigating the harmful vibrations.
Solution Approach 2:
The exhaust energy and vibrations from the internal combustion engine are converted into beneficial effects. The exhaust heat is utilized for thermal management of the battery and onboard equipment, while the vibration-isolating assembly converts harmful vibrations into dampened mechanical energy through specialized dampeners, transforming harmful factors into useful functions.
2Power
If an internal combustion engine is used to ensure high power and long-duration flight, then power and flight duration are improved, but noise increases
Solution Approach 1:
The exhaust energy from the internal combustion engine is converted into a beneficial thermal resource. A heat exchanger system captures the exhaust heat and utilizes it for thermal management of the battery and onboard equipment, transforming the harmful noise and heat exhaust into a useful heating source that extends flight duration by optimizing energy utilization.
3Object-affected harmful factors
If vibration dampeners are added to reduce vibrations, then vibrations are reduced, but device complexity increases
Solution Approach 1:
The vibration-isolating assembly is segmented into modular components including individual vibration dampeners, isolating mounts, and heat exchanger elements. Each component performs a specific function and can be independently installed, maintained, or replaced. This segmentation reduces the perceived complexity by organizing the vibration reduction system into manageable, functional modules rather than a monolithic complex structure.
4Adaptability or versatility
If multiple components are integrated in the power unit, then functionality is improved, but weight increases
Solution Approach 1:
Multiple functional components are merged into integrated assemblies. The vibration-isolating assembly is combined with the heat exchanger system and mounting structures to form a unified power unit integration. This merging reduces the total weight compared to separate installations of each component, as shared structures serve multiple functions simultaneously.
Solution Approach 2:
The exhaust system serves multiple functions: it acts as a thermal source for the heat exchanger, a structural element of the power unit, and a vibration transmission path that is simultaneously isolated. The heat exchanger not only cools the battery and onboard equipment but also serves as a mounting structure. This multi-functionality reduces the need for separate components, thereby reducing overall weight.
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
Reduces vibrations, optimizes weight distribution, and extends flight duration by ensuring continuous power supply and reduced mechanical wear, enhancing the reliability and aerodynamic characteristics of UAVs.
Implementation Method 1
coupled to an engine bulkhead via a vibration-isolating assembly
Implementation Method 2
the assembly is a mounting support having one end that is used for connection to the engine bulkhead
Implementation Method 3
The engine is equipped with a muffler and coupled to an engine bulkhead via a vibration-isolating assembly
Implementation Method 4
an electrical generator, arranged on an output shaft of the engine between the propeller and the engine
Data Source
AI summary
A power unit of an unmanned aerial vehicle (UAV), the power unit includes an internal combustion engine with a propeller and an electrical generator on its output shaft. The engine has a muffler and is coupled to an engine bulkhead via a vibration isolation assembly. A battery and a fuel tank are arranged in a fuselage middle part, and the tank is coupled to the engine via a fuel line. The electrical generator is arranged between the propeller and the engine and is configured to operate in a starter mode. The vibration isolation assembly comprises an engine plate secured to the engine bulkhead and an engine mount coupled to the engine. The plate and mount are coupled between each other with supports equipped with vibration-dampening assemblies coupled to the mount. An arc-shaped bracket is between the engine plate and the engine mount and is secured to two supports and coupled to the mount via an additional vibration-dampening assembly. The engine is coupled to the mount via spacers.