Reconstruction And Analysis Of Muscle Deformation Based On Limited Measuring Point Information

The development of exoskeleton robots aims to improve the body's weight-bearing capacity and reduce energy consumption during human body movements,thereby assisting the human body in flexible natural movements.However,exoskeleton equipment is often unable to achieve coordination with human movements.The reason is that lack of a deep understanding of the human body's natural movement laws makes it difficult for wearable equipment to conform to the deformation of the human musculoskeletal system,which leads to its restraint and hinders the human body's natural movement.Eventually increase the body's exercise metabolic energy.The muscle is the only motor for the natural movement of the limbs,and is the basic unit of work and energy consumption.Its deformation comprehensively reflects the changing characteristics of movement,force and energy consumption.However,there is currently no theoretical method for measuring muscle deformation during exercise.To this end,in this paper,the muscle deformation under the two-dimensional cross-section is turned into an object.Based on the measurement information of the flexible point,a reconstruction method for the deformation displacement field is established.In order to achieve the measurement of muscle deformation,based on the knowledge of human skeletal muscle physiology,the dynamic equation of the musculoskeletal system is established according to the Hill muscle model.Based on the principle of modal superposition,the reconstruction method of the displacement field of the muscle section is proposed.According to the constraint relationship between the muscle and the skin surface layer,the skin surface layer is simplified into a two-dimensional ring beam model,and then the location of the measurement point is optimized by a genetic algorithm based on simulated annealing.The curvature mode is used to reconstruct the overall strain field and displacement field of the ring beam.The musculoskeletal system is simplified as a circular disk model.The inner circle of the disk is the part where the bones and the muscles are connected,and it is set as a fixed hinge,and the outer circle is the skin surface and is set as the free end.Then reconstruct the displacement field of the whole disk by the displacement values of the finite measuring points on the outer ring.From the perspective of the change of the cross-sectional area of the muscle,a part of the fan-shaped area of the disc is extracted,and the displacement field of the fan-shaped area is reconstructed by the displacement mode and the strain mode,and the change in the area of the fan-shaped area during the application of load refactoring and analysis.Using medical ultrasound equipment to monitor muscle deformation,through image processing means can obtain any displacement time image in the ultrasound image,according to the proposed displacement field reconstruction theory to reconstruct the displacement field of the muscle two-dimensional cross-section,in order to reconstruction algorithm to verify.At the same time,the thickness and cross-sectional area of muscles during deformation are calculated and analyzed.Through the above simulations and experiments on muscle cross-sections,it provides basic theories and methods for quantitatively measuring the displacement distribution of muscle cross-sections,in order to explore the mysteries of human movement laws.