The monitoring of a wide variety of bridges often requires an approach that, a priori, does not take into account the specific vibrational modes of their structure. An experimental approach to this issue requires to sufficiently energize the structure to allow the detection system to collect the entire range of the structure vibrational modes as well as to characterize their time evolution, also to get information on the structure degradation state. With the aim of monitoring the dynamical response of bridges, the present work addresses an approach based on both a wavelet transform and on an innovative cross-correlation wavelet analysis of the response signals obtained by a traffic-dependent energizer and by an impulsive energizer, where for this latter a new mathematical model has been formulated. The employed devices realize two different stress conditions for the mechanical structure while the wavelet analysis provides the tool for processing the recorded structure response. It is shown that the analysis of a viaduct response, which also includes the cross-correlation wavelet method, makes possible to perform a joint time–frequency analysis for both the cases. Discrete wavelet transform is employed for signal denoising while continuous wavelet transform for detecting signal frequencies and time localization. The performed frequency analyses furnish a common value for the main frequency, i.e. 2.15 Hz for the traffic-dependent energizer and 2.8 Hz for the impulse energizer. The wavelet cross-correlation between the signals produced by the traffic-dependent energizer and by the impulsive energizer, furnishes a diachronic picture of its correlation coefficient.

各种桥梁的监视通常需要一种先验地不考虑其结构的特定振动模式的方法。针对这个问题的实验方法需要充分激励结构，以允许检测系统收集结构振动模式的整个范围，并表征其振动时间，还可以获得有关结构退化状态的信息。为了监测桥梁的动力响应，本工作提出了一种基于小波变换和基于互相关小波分析的，由交通相关的激励器和脉冲激励器获得的响应信号的方法，其中为此，已经建立了一个新的数学模型。所使用的设备为机械结构实现了两种不同的应力条件，而小波分析为处理记录的结构响应提供了工具。结果表明，对高架桥响应的分析（还包括互相关小波方法）使两种情况下的时频联合分析成为可能。离散小波变换用于信号去噪，而连续小波变换用于检测信号频率和时间定位。进行的频率分析为主频率提供了一个公共值，即与交通相关的激励器为2.15 Hz，对于脉冲激励器为2.8 Hz。交通相关激励器和脉冲激励器产生的信号之间的小波互相关，