垂准仪法超高层建筑平面控制网竖向传递

近年来,随着经济的发展和土地资源的紧缺,超高层建筑越来越多,高度也越来越高,施工测量的难度也越来越大,如何准确地实现超高层建筑平面控制网竖向传递成为超高层建筑施工测量的难点和重点。垂准仪法受环境影响小,投测距离大,效率高,误差小,是目前超高层建筑平面控制网竖向传递内控法的主要方法,本文以某超高层建筑为例,论述了垂准仪法平面控制网竖向传递的具体实现及精度检核方法。

The Application of a Smartphone in Ship Stability Experiment

The inclining experiment is the only regulatory tool to assess ship stability. This experiment is a time consuming process for both real-life tests and ship model experiments. The difficulty is mainly due to a bias in the measurement of heel angle. Nowadays, digital inclinometers are available, but they are expensive. In this study, the use of a smartphone application is presented for ship inclination and rolling-period tests. The idea consists of using accelerometer and gyroscope sensors built into the current smartphones for the measurements. Therefore, some experiments are carried out on an example trawler model to exhibit the uses and advantages of this method. The obtained results are in good agreement with those provided from the pendulum method and natural roll-period test. This application is new, easy, and more accurately assesses metacentric height during the inclining and rolling-period tests.