Composite Sprayer Boom Structure for Vibration and Cost Control
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Solution Overview
Problem
Existing agricultural sprayer booms face structural failure due to increased stress from vibrations and oscillations, especially with longer lengths, and using composite materials like carbon fibre is costly and impractical for widespread use.
Innovation Solution
A boom construction using a tubular structure with flat plates made from composite materials like carbon fibre and curved connecting members made from cheaper materials like steel or aluminium, providing a strong and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If composite materials like carbon fibre are used to achieve desired stiffness-to-weight ratio, then structural strength and weight efficiency are improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The boom is divided into multiple sections with different material compositions. Inner boom sections use carbon fibre reinforced plastic for optimal strength-to-weight ratio, while outer boom sections use aluminium for cost-effectiveness. This segmentation allows each section to be optimized for its specific functional requirements, achieving overall structural performance without uniformly high costs.
Solution Approach 2:
Different portions of the boom structure are assigned different materials based on local stress requirements and cost considerations. The inner sections experience higher stresses and warrant the use of expensive carbon fibre, while outer sections can accommodate aluminium. This local differentiation optimizes the balance between performance and cost.
2Length of moving object
If boom length is increased to expand operating width, then spray coverage is improved, but risk of structural failure due to vibrations and oscillations increases
Solution Approach 1:
The boom is divided into multiple sections that can independently manage vibration stresses. Each section acts as a discrete structural unit, reducing the propagation of oscillations across the entire boom. This segmentation allows longer overall boom lengths while maintaining structural reliability through localized stress management.
Solution Approach 2:
The use of composite materials (carbon fibre reinforced plastic and aluminium) provides superior strength-to-weight ratio and vibration damping characteristics compared to conventional single materials. These composite structures resist bending forces and oscillatory stresses better, enabling longer boom lengths without proportionally increasing failure risk.
3Ease of manufacture
If conventional materials like aluminium and steel are used, then manufacturing cost is controlled, but stiffness-to-weight ratio is insufficient for boom lengths greater than 36m
Solution Approach 1:
The boom structure is segmented into inner and outer sections with different material assignments. Inner sections use high-performance carbon fibre where superior stiffness-to-weight ratio is critical, while outer sections use cost-effective aluminium. This segmentation enables the overall structure to achieve the necessary performance characteristics for lengths exceeding 36m without uniformly inflating manufacturing costs.
Solution Approach 2:
Combining carbon fibre reinforced plastic and aluminium creates a hybrid composite structure that leverages the advantages of both materials. The carbon fibre sections provide the necessary stiffness and strength for long boom operation, while the aluminium sections provide cost-effectiveness and structural integrity, achieving a balanced performance-cost ratio.
4Strength
If carbon fibre booms are used to achieve desired mechanical properties, then structural strength is improved, but repair complexity and cost increase due to complete replacement requirements
Solution Approach 1:
The boom is divided into separable sections that can be independently replaced or repaired. If damage occurs, only the affected section needs replacement rather than the entire boom. This segmentation significantly reduces repair costs and complexity compared to monolithic carbon fibre constructions, while maintaining the structural strength benefits of composite materials in the operational sections.
Data Source
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AI summary
A boom for an agricultural crop sprayer has an elongate triangular box arrangement that is load bearing and serves to carry liquid dispensing devices for the application of crop protection products. The box arrangement includes three elongate plates each formed preferably from a carbon fibre material. The plates may be secured together by bolts or rivets by three connecting members that each present elongate edges of the box arrangement.