What Role Does A PLM Solution Play In Mechatronics Development?
June 16th, 2008- Ability to define and manage all necessary product information throughout the process;
- Ability to synchronize activities of multi-disciplinary teams into the optimal sequence of work given product information dependencies.
Usually, when we talk about product information management we emphasize physical product content that needs to be authored and released to sales and manufacturing value chains. Today, products are increasingly complex to satisfy very sophisticated usage scenarios, ranging from advanced communication and navigation, to precise automatic movements involving electrical actuators and electronic motion control loops. With increased electro-mechanical and software content come the need to see products as complex working systems intelligent about their surroundings in multiple contexts (normal usage, functional problem, service mode, etc.). Managing information just about their physical content will not suffice in that case.
Thus, we need to expand the definition of the product to be able to describe it as an interacting system, so we can define for example its usage scenarios, logical relationships between functions, and various parameters and constraints describing its performance. A set of documents associated with physical and logical definition of the product goes beyond 3D models and drawings, to include various function and performance simulation models, validation and test data, as well as knowledge artifacts representing technological constraints.
Another important aspect is that the number and type of users of the product information management solutions widens in mechatronics development, involving a broad set of experts and often geographically dispersed teams. That in return requires careful mapping of all information dependencies and recognition of views and needs of different users to make usre that the right and good quality information reaches everyone when they need it. This integrated environment quickly becomes unfamiliar to everyone involved in at least one new aspect. For example, mechanical engineers now have to extract and capture dynamics and kinematics design parameters (such as distribution of masses, 3D paths of moving parts and joints, non-dimensional ratios for fluid and thermal simulations, etc.). Electrical engineers need to master 3D navigation of physical layouts and author configuration management of options and variants. Software engineers need to understand the needs and structures of enterprise information release and change management processes. One way or another, integrated mechatronics management will pose both organizational and information systems challenges.
Yet, choices are few. We can neglect the fact that much more product information than what we are normally used to, will have to be associated and comunicated as an integral package. That will spare us from having to expand the information models of our PDM systems. In fact today, most mechatronics efforts in terms of information management are directed towards model authoring, requirements management, simulation data capture, test and validation management, but all in relative isolation from each other. Rarely have we seen a comprehensive information management framework dealing with the information cointained in the models, not just the models themselves. Avoiding to develop an integrated system definition management approach, we will be faced with costly manual reconciliations, wasted efforts in unecessary communication and planning overhead, and potentially significant drop in overall product quality. In other words, what we save on program preparation, we will pay in change management costs.
Or, we can acknowledge growing complexity and strategize this transition from Product Definition Management to System Definition Management. We will have to add many new information entities to our scope of product information management – such as requirements, functions, design parameters, use cases, simulation packages, test results, etc. The scope expands, but there are benefits in managing the information within an integrated framework. In that case, we have to consider what is the best strategy for exapnding the scope o coverage of our product information management system.
PLM systems come to mind as natural best candidates for this task. These systems have already solved many critical needs such as scalability, workgroup technology, configuration management and role dependent representations. However, very few PLM vendors announce their readiness to pursue this expansion. Siemens PLM has recently announced the plans for integration of the information model from requirements to the service and end-of-life. In many aspects it is a monumental undertaking, but nevertheless the one that has potential to deliver an order of magnitude higher value than what we experienced with normalization of the enterprise transaction flows using ERP systems.
This need to expand the product definition management into system definition management has been recognized for many years. Many attempts have been made by industry groups and individual companies. We have been involved in many of these projects and assessed their progress and challenges. Some approaches were all encompassing when it comes to information modeling, but in many aspects impractical since they did not solve the dependencies management problem. Example is STEP AP233. Others approaches target specific aspect of the problem and could be a good candidate for incluysion into the overall framework. SysML is a good example of condensed communication format for capturing and exchanging multi-purpose system models. What is different now is increased maturity and understanding of the needs and rising importance of mechatronics to strategic differentiation of many products.
A high level overview of three main mechatronics solution topologies reveals priorities in addressing the solution.
Industrial mechatronics covers complex systems for process control. These systems often integrate intelligent monitoring of a value added production, transportation or energy transformation process (often involving thermo-fluid-electro-mechanical physical phenomena), syncronous motion of many parts, and compensate for various disturbances keeping the process robust and efficient. Usually, the condition of the system operations are well (better be) predictable and have to be in fact detailed out in advance before system design and integration. Emphasis in mechatronics is on integrated simulation using advanced 3D and FEA, rule based design parameter constraints and integrated change management.
Consumer mechatronics systems provide for a myriad of usage scenarios, from remote communications and user info aggregation to smooth control functions utilizing intelligence and motion precision to delight end users. However, rarely can we count on well defined upfront requirements, yet we want well integrated system without surprises in performance. In many aspects the behavior of the system is emergent and we have to focus on covering as much as we can of the known and hidden dependencies. In this case, the emphasis is on functional modeling and function allocation management, configuration management (options and conditions) and as high as possible reuse of known implementations.
Military mechatronics provides for management of complex interactions between independently controlled machines and fast thinking humans. In many aspects, military mechatronics deals with the emergent behavior of not only one system, but a network of interacting systems that may or may not have integrated control mechanisms. Focus is on intelligence on emergent requirements (not just known requirements), advanced simulation and validation, configuration management, as well as change management.
A cross section of priorities thus includes: requirements management, functional modeling and functional allocation, system design parametrization, simulation and validation, configuration management, change management and reuse. Obviously, depending on the topology as described above, the priorities may shift. Yet, a comprehensive integrated mechatronics solution must address these areas with a fully inegrated information model for system definition management and ability to capture and navigate dependencies throughout all phases of the development process.

