9/14/2023 0 Comments Canvas psuThis serves as a reference for the actual vibration of the canvas during transport. Based on this motivation, in this contribution, a method is proposed to reproduce in the laboratory the main vibration of the strainer during transport, so that the vibration of the canvas can be directly observed in the laboratory. If more accurate information about the vibration response or vibration level of the canvas during transport would be known, it would allow to optimize the transport conditions and further protect the painting. However, during this process, the response of the canvas itself is always unknown and practically impossible to monitor. These accelerometers capture the response of the strainer to shock and vibration excitation during transport, which assists art conservators to make predictions, evaluations, and improvements. A common practice is, to use accelerometers attached to the strainer. In, an advanced small laser displacement sensor was used, but it was found that the fixture of the sensor may possibly change the dynamic characteristics of the crate and severely limits the value of the obtained information. Furthermore, the lack of an inertial reference makes contactless measurements very difficult. Attaching sensors to the canvas is in any case unacceptable and dangerous. Constrained, among others, by the cramped design of the packing case, it is difficult to directly monitor them during transport, as the equipment required is generally too bulky to be included alongside the painting in a standard packing case. Therefore, how to effectively monitor the response of a painting to shock and vibration excitation during transport is of great significance. Combined with the dynamics characteristics of the painting, art conservators can also improve the packaging systems to prevent the eigenmodes of the painting from being excited, and avoid irreversible damage. By monitoring the motion of the painting during transport, they try to define safety limits of shock and vibration for the painting, predict the damage of the painting, or evaluate the vibration isolation performance of the packaging system. With the increase in loan of artworks between museums, art conservators are increasingly concerned about the behaviour of paintings in their care in response to shock and vibration during transport. Therefore, the designed vibration reproduction system provides a reference for the unknown canvas response during transport, and further helps art conservators to evaluate the transport process of the painting. A long-term reproduction experiment verifies its stable reproducibility. Even though some overshoot in the reproduced acceleration can be observed in some cases, the overall reproduction is very good. The experimental results show that the vibration reproduction system has sufficient reproduction accuracy for the vibration response. The vibration of the canvas is then measured by a laser Doppler vibrometer without contact. A real-time simulation platform based on the multi-channel Filtered- x Least Mean Square (FxLMS) algorithm controls four actuators simultaneously and reproduces the vibration of the strainer obtained from a real transport experiment. There, the resulting vibration of the canvas can be conveniently observed in a controlled environment with respect to an inertial reference. For this reason, based on vibration data measured on the strainer that is easily obtained during transport, this contribution proposes to reproduce these with high accuracy in the laboratory. However, limited to the narrow structure of the transport crate, the lack of an inertial reference, and the limitations to attach sensors to the canvas, this is a difficult task. Monitoring the vibration of the painting canvas during transport is of great significance to protect paintings from damage.
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