## 2 The Measuring System for Monitoring Vibrations of Building Structures  
When determining the effects of energy on building structures, attempts are made to estimate and model vibrations theoretically, as mentioned. An inability to find the real impact of energy on buildings analytically and precisely is due to the heterogeneous medium between the vibration source and the building. The medium comprises layers, such as sand, silt, and clay. The layers are characterised by variable thickness, and other disturbances are caused by underground structures, such as pipelines or foundations of structures other than the tested one. The impact on the object can only be precisely determined by measuring the tested object (Figure 2). Complete commercial solutions dedicated to vibration measurement are available. Their disadvantage is the high purchase costs and the ability to carry out measurements only to the extent provided by the software from the manufacturer. The discussed system for measuring and recording the kinematic impact on building structures is an open-access system. The system characteristics include:  
* Possibility to modify the code regarding the collected data,
* Remote access to online data with different access levels, i.e., administrator (possibility to modify the code and presentation method) and user (viewing current data and data from a selected period),
* Generation of results, allowing immediate confirmation of whether the vibration value is allowed by the standard. Figure 2: Block diagram of the wave generation and the vibration transfer during pile driving. The acquisition card processing data from three channels of the vibration sensor must be placed in a housing unit. The dedicated acquisition card housing unit is presented in Figure 5. A one-slot NI cDAQ-9171 chassis was used. This kind of housing is designed for use with C Series modules. The housing provides power to the acquisition card and supports data transmission in accordance with the Hi-Speed USB 2.0 standard. The measurement system software is dedicated to the Windows environment. In the described case, the measurement system was run on a reinforced (\"rugged line\") tablet from Dell (Figure 5). Devices in industrial applications cannot be expected to operate in sterile conditions. They may be at risk, among others, from the negative effects of dust, temperature, and humidity. Therefore, a device from the \"rugged\" line was used. The manufacturer has declared that the equipment is capable of functioning within a temperature range of (\(-\)29) to (+63) degrees Celsius. The tablet is dustproof and resistant to low-pressure water jets directed at any angle. The right side of Figure 5 shows the housing unit in which the system is placed for the duration of the measurements. It provides additional protection against external influences and interference by unauthorised persons. Vibration measurements during construction work usually take a long time. They cover the entire period of work that may have a negative impact on buildings. In order to improve the reliability of measurement recording, preliminary tests of data collection, registration, transmission, and remote access are first carried out (Figure 6). During measurements, all elements of the measuring system are closed in a housing unit. The housing unit meets the basic requirements of standards for protection against ingress of solid objects (IP4X), ingress of water (IPX4), impacts (IK10), and exposure to fire (UL 94 V-0) (Figure 6, right side). The housing prevents objects larger than 1 mm in diameter, such as larger insects, from gaining access to the interior. The housing provides protection against water being sprayed from any direction. The upper part of the housing unit should withstand the impact of an object weighing 5 kg dropped from a height of 40 cm. With a direct flame impact on the housing unit, the burning process should stop within 10 s and