Design of Experiments (DoE) for Optimization of Efficiency in Parallel Offset Couplings

Abstract

Traditional couplings can accommodate only axial and parallel shaft misalignments. In a select few applications, it is necessary to correct any potential shaft misalignment. The coupling capacity and gearbox efficiency are limited by the side loads put on the shaft. If side loads are exceeded, it may result in vibrations, a shorter lifespan, or the failure of crucial machine parts like bearings and motors, among others. These joints produce vibrations and have low efficiency due to their restrictions on the maximum offset distance, angle, and speed. The multi-dimensional connection was created and developed in the current work. It consists of kinematic linkages with parallel offsets of 10 to 40 mm on either side of the input shaft, respectively, to offer power transmission. Using a design of experiments (DoE) to create a test matrix for input parameters like applied weight (4.9 to 19.6 N in four increments), and drive-speed (600 to 900 rpm) experiments were conducted. Tests were performed for parallel (10, 20, 30, and 40 mm) offsets. Investigated were performance metrics such as efficiency. The design was secure when the objectives of parallel misalignments were met within the predetermined range. Additionally, the experimental setup was reliable for transmitting all loads at any operating speed for the specified parallel offsets. It was shown that the newly created multi-dimensional coupling for parallel offsets had minimal effects on coupling efficiency.