. Phương pháp tính toán công thức đã được thực hiện hiệu quả hơn. Cả hai tăng tốc độ tổng thời gian tính toán bảng tính. Trong khi nó có thể mất một vài năm trước khi công ty chuyển sang Excel 2007, các doanh nghiệp nhỏ và các cá nhân am hiểu công nghệ muốn chạy Excel 2007 và họ sẽ cần phải biết làm thế nào nó ảnh hưởng đến cuốn sách này. | Chapter 2 Modeling in a Multibody Simulation A variety of issues can arise when modeling a multibody finite element modeling of a multibody mechanism depends on the degree of complexity that you require. For example it is often possible to create a quick initial approximation of the flexible and rigid parts of a mechanism using standard beam elements and rigid beam link elements. Alternatively you can perform detailed modeling of the flexible part using 3-D solid elements or shell or solid-shell elements and the rigid part using the ANSYS program s extensive contact capabilities. The following topics related to multibody analysis modeling are available . Modeling Flexible Bodies in a Multibody Analysis . Modeling Rigid Bodies in a Multibody Analysis . Connecting Multibody Components with Joint Elements . Modeling Flexible Bodies in a Multibody Analysis Consider a slider-crank mechanism as shown in the following figure. The crank is considered to be rigid and the connecting link is assumed to be flexible. The link connects the crank to the sliding block or piston . The simplified finite element model of the slider-crank mechanism is also shown. Release - 2009SAS IP Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS Inc. and its subsidiaries and affiliates. 5 Chapter 2 Modeling in a Multibody Simulation Figure FE Slider-Crank Mechanism Revolute Joint The slider-crank mechanism has these characteristics The rigid crank is modeled with an MPC184 Rigid Beam element. The rigid crank is connected to ground with a grounded MPC184 Revolute Joint element. The connecting link is flexible and modeled with BEAM188 elements. The rigid crank and the connecting link are connected to each other by a MPC184 Revolute Joint element. The connecting link moves within a grounded MPC184 Slot Joint that approximates a slider block. As a quick first attempt you can model the flexible mechanism with some simple .
