# Sim4RAD：用于串联机械臂设计阶段尺寸确定、执行器选择和URDF模型验证的MATLAB工具包

> 原文链接：https://robotics.hellobike.com/papers/2026-10-13-2610-17534
> 频道：papers | 更新日期：2026-10-13 | 标签：arxiv, cs.RO
> 核心摘要：Sim4RAD用参数化刚体建模与多类分析，支持串联机械臂早期执行器选型，并在7-DOF仿人臂三种布局上验证。

# Sim4RAD：用于串联机械臂设计阶段尺寸确定、执行器选择和URDF模型验证的MATLAB工具包

::: v-pre
> 原文链接：[Sim4RAD: A MATLAB Toolkit for Design-Phase Sizing, Actuator Selection and URDF-Model Verification of Serial Robotic Arms](https://arxiv.org/abs/2610.17534)（arXiv 2610.17534 · 发布日期：2026-10-13）

**Sim4RAD: A MATLAB Toolkit for Design-Phase Sizing, Actuator Selection and URDF-Model Verification of Serial Robotic Arms**

Sim4RAD用参数化刚体建模与多类分析，支持串联机械臂早期执行器选型，并在7-DOF仿人臂三种布局上验证。

## 核心要点

- 早期执行器规格会在CAD前锁定电机、减速器和制动器，影响后续设计。
- 工具包由少量参数构建刚体模型，提供静态、动态、随机运动及工作空间/灵巧度分析。
- 在7-DOF仿人臂三种布局比较中，肩轴重排最坏转矩不变且可达体积接近。
- 末端腕关节与负载同轴可降低重力和扫描需求，但会牺牲灵巧度；代码已在GitHub提供。

**验证范围与局限**：摘要中的验证案例限于一个7-DOF仿人机械臂的三种布局比较，URDF用于详细设计模型验证。

## 英文摘要 (Abstract)

Actuator sizing is an early and consequential decision: joint torque and velocity specifications fix the motors, gearboxes and brakes before any CAD model exists. Sim4RAD is a MATLAB toolkit for that phase and for the verification that follows it. It builds a rigid-body model from a handful of parameters, and four analyses supply the specification: a static analysis combining lever-arm sampling with a posture search, giving a rated torque at a chosen payload envelope and a reproducible peak torque; a dynamics pipeline that reshapes a trajectory under one of four constraints, including the actuator torque-speed envelope; a stochastic analysis over many random motions, so a specification rests on a class of motions, not one trajectory; and a workspace and dexterity analysis that separates where the arm can reach from how it can reach there. Replacing the synthesized model by a URDF file turns the same analyses to verification. A 7-DOF anthropomorphic arm is compared in three layouts differing in the shoulder axis order and in whether the last wrist joint is coaxial with the payload. The static demand at half arm length is nearly the same in all three, and it sizes the joints rather than the sampled motion; reordering the shoulder axes leaves the worst-case torque unchanged at 55 N m and the reachable volume within 8 percent. A last wrist joint coaxial with the payload removes its gravity torque, reduces the adjacent wrist joint by almost a third and cuts the last joint demand tenfold in a 5 m/s scan, at the price of dexterity (mean 0.570 to 0.348). The same arm needs 20 to 37 times more torque for a 5 m/s target than for a 2 s motion: the scenario, not the trajectory, must be fixed first. Verification should use the URDF model of the detailed design; the toolkit is available at https://github.com/LasterLi/Sim4RAD.

作者：Jingchen Li
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## 原始参考来源 (Sources)

- [arXiv 2610.17534：Sim4RAD: A MATLAB Toolkit for Design-Phase Sizing, Actuator Selection and URDF-Model Verification of Serial Robotic Arms](https://arxiv.org/abs/2610.17534)