A modular building unit (MBU) is a volumetric box-like structure that is manufactured in the factory and transported to the building site. Damage to internal components of an MBU during transportation is widely reported. The accidental uplifting behaviour of the MBU on the trailer riding over road bumps has been studied and published. What ensues from the uplifting of the MBU is pounding on the trailer bed. Mounts/pallets used for transporting MBU would cushion the impact to an extent determined by its material properties. The first half of the work presents a methodology to quantify the impact acceleration resulting from a steel MBU to wooden mount impact. Authors have employed dynamic scaling and numerical modelling in LS Dyna along with established quasi-static testing technique to predict the dynamic contact properties of steel-wood impact. Hunt's – Crossley contact force model was then deployed to quantify the impact acceleration pulse analytically. A 10-tonne steel module impacting on pinewood pallet with 1 m/s velocity was found to generate an impact accelerations pulse of up to 25–35 g's using experimental, numerical and analytic techniques. The second part of the work predicted the response accelerations in the components attached to the MBU at midspan location. Vertical plane stiffness of an MBU structure was shown to affect the component response accelerations significantly. Typical steel MBU was found to amplify the component acceleration to up to 3-times the impact pulse generated during pounding. The highlight of the work is its ability to employ simplistic quasi-static testing on the choice of mounts (cushions) and predict its dynamic contact properties which in turn facilitates contact force equations (H&C) in predicting impact pulse on the prototype MBU.

模块化建筑单元（MBU）是一种在工厂中制造并运输到建筑工地的类似盒子的容积式结构。广泛报道了运输过程中对MBU内部组件的损坏。已经研究并发布了MBU在挂在路障上的拖车上的意外提起行为。MBU的提升所引起的后果是挂车底盘受到重击。用于运输MBU的支架/货盘会在一定程度上缓解冲击，其影响取决于材料的特性。上半部分的工作提出了一种方法，用于量化钢制MBU到木架碰撞产生的冲击加速度。作者在LS Dyna中采用了动态缩放和数值模型，以及已建立的准静态测试技术来预测钢木碰撞的动态接触特性。然后，使用了亨特–克罗斯利接触力模型来分析量化冲击加速度脉冲。使用实验，数值和分析技术，发现以10 m / s的速度撞击松木托盘的10吨钢组件会产生高达25–35 g的撞击加速度脉冲。工作的第二部分预测了跨中位置连接到MBU的组件中的响应加速度。结果表明，MBU结构的垂直平面刚度会显着影响组件响应加速度。发现典型的钢制MBU可以将部件加速度放大到冲击过程中产生的冲击脉冲的三倍。