基于TRIZ-AD的振动辅助充种气吸式大豆精量排种装置设计

Design of a Vibration-Assisted Seed-Filling Air-Suction Precision Seed-Metering Device for Soybean Based on TRIZ-AD

摘要: 针对传统气吸式大豆排种器在高速作业时存在的充种性能差、气压依赖性高及品种适应性不强等问题，研究提出一种集成创新设计方法，将发明问题解决理论(TRIZ)与公理化设计(AD)相融合，开展振动辅助充种气吸式大豆精量排种装置的设计。首先，利用TRIZ九屏幕法对排种系统进行资源分析，明确理想化目标与用户需求；其次，通过AD“之”字形映射构建功能–结构分解框架，在设计矩阵识别出耦合问题后，应用TRIZ的矛盾矩阵与发明原理进行解耦与方案求解。在关键部件设计中，采用离散元与计算流体动力学(DEM-CFD)耦合仿真，揭示振动激励下的种群运动规律与气流场分布特性，并通过响应面法优化吸孔数量、工作负压与作业速度等核心参数。台架验证试验表明，在吸孔数量为48个、负压为4.2 kPa、作业速度为8.5 km/h的最优参数组合下，排种合格率达到94.9%，相对误差仅为0.9%。该设计从方法论与结构层面为大豆精量播种装备的创新研发提供了新的思路与参考。

Abstract: To address the issues of poor seed-filling performance, high dependence on air pressure, and limited variety adaptability commonly encountered in traditional air-suction soybean seed-metering devices during high-speed operation, this study proposes an integrated innovative design methodology by fusing the Theory of Inventive Problem Solving (TRIZ) with Axiomatic Design (AD) to develop a vibration-assisted seed-filling air-suction precision seed-metering device for soybean. Initially, the nine-screen method of TRIZ was employed to conduct a resource analysis of the metering system, thereby clarifying the idealization objectives and user requirements. Subsequently, a function-structure decomposition framework was established through the zigzagging mapping of AD; once coupling issues were identified in the design matrix, the contradiction matrix and inventive principles of TRIZ were applied for decoupling and solution generation, for the design of critical components, coupled discrete element method and computational fluid dynamics (DEM-CFD) simulations were carried out to reveal the seed population movement behavior under vibration excitation and the airflow field distribution characteristics. The core parameters, including the number of suction holes, working negative pressure, and operational speed, were optimized via the response surface methodology. Bench validation tests indicate that under the optimal parameter combination of 48 suction holes, a negative pressure of 4.2 kPa, and an operational speed of 8.5 km/h, the qualified seeding rate reaches 94.9%, with a relative error of merely 0.9%. The proposed design offers novel insights and references for the innovative development of soybean precision seeding equipment from both methodological and structural standpoints.