Subassembly defined

Upon completion of tlie inspection process the results were reviewed, and the following requirements were defined for each major component of the hot gas expander and its respective subassemblies ... 

Welded Welded joints connect the subassemblies of some fluid power systems, especially in high-pressure systems that use pipe for fluid lines. The welding is done according to standard specifications that define the materials and techniques. 

An assembly contains a list of materials and production processes, as well as transport processes. Assemblies do not contain environmental data instead, they link to processes that contain such data. Some parts, such as the mains cable, can be defined in subassemblies. A convenient way to visualize the structure and contents of an assembly is to use the process tree function (Figure 18.4). 

Once the customer needs (top level CTQs) have been defined a DFSS team needs to determine how process parameters that can be addressed, such as raw materials, process control parameters, etc. are related to the ability to deliver customer CTQs. This is done by generating a series of quality functional deployment (QFD) matrices as sketched in Fig. 3. There is no hard and fast rule on how many levels a QFD needs. Frequently, polymer and chemical QFDs have only three levels as there are no subassemblies, and consequently, there is no need for a parts QFD because process specifications relate directly to the process design CTQs. 

Assembly is the process by which the various parts and subassemblies are brought together to form a complete assembly or product, using an assembly method either in a batch process or in a continuous process (Ttuner 1993). VDI Guideline 2860 defines assembly as the sum of all processes needed to build together geometrically determined bodies. A dimensionless substance (e.g. slip materials and lubricants, adhesives, etc.) can be applied additionally. ... 

Both test and inspection are from Latin roots, with the former defined by Websters as to view closely in critical appraisal look over, and the latter implying a critical examination, observation, or evaluation or a procedure, reaction, or reagent used to identify or characterize a substance or constituent. Precision, depth, and validity are key elements in these definitions, wMle reliability appears of necessity in a manufacturing context where a sequence of decisions is required. To differentiate between test and inspection, test typically requires a determination of functional suitability for use, while inspection is more usually confined to indications of fitness for purpose short of actud use testing. For example, each new aircraft produced will be flight tested before delivery to determine whether it fulfils its functional requirements. Prior to this flight test, considerable inspection of components and subassemblies will have taken place to ensure that they are free from manufacturing or assembly defects. 

The construction of assemblies is supported by numerous methods for solving a variety of problems that have emerged in engineering practice. Relationships are also defined for placing subassemblies. Form features that modify two or more parts, such as holes and channels going through several parts are called assembly features. Patterns, datum features, and surface copy features also can be defined as assembly features. 

The fourth closed loop defines the relationship between the number of pallets with car doors in different subassembly states and the number of pallets of cars with disassembled doors using an external variable (x), according to (30.4). This variable represents the four-door car ratio between the door disassembly stations, located at M2 and the door assembly stations, located at M4. This variable can have values between 0 and 1. 

The next step is to identify candidate scenarios that would benefit from RFID and to measure the potential benefit in a self-defined scale. For example, for manufacturing units, RFID can be used to support quality control by querying components and subassemblies as they enter the facility. This is a typical candidate scenario that can be identified. It is recommended for the organization to enumerate all the potential RFID-involved candidate scenarios that can impact an organization s core competences. One efficient way to accomplish such an enumeration would be to define several business areas based on the... 

In the core there are 6 control subassemblies (4 primary+2 secondary). The control material is boron carbide (B4C) enriched in "B, with the pellets being clad in stainless steel cylindrical tubes. In the present reference design the control subassembly inserting and withdra wing mechanisms have not been defined. 

To understand system safety, one must know the fundamentals that go into defining the discipline. A system can be defined as a group of interconnected elements united to form a single entity. Systems may include something as simple as a toaster or as complex as a chemical refinery. Perhaps the most important thing about systems is that they can sometimes be and often are further defined into subsystems, assemblies, subassemblies, and components (see figure 9-1). If the subsystems contain interdependent entities, they then also can be defined as systems. For example, a car brake can be defined as either a stand-alone system or a subsystem of an automobile. 

A total breeding gain 1.16 was ejq)erimentally defined at the time of reprocessing of the fuel evacuated from the plant. The fuel cycle, based on mixed oxide fuel and PUREX reprocessing, has been closed and the first fuel subassembly made with reprocessed plutonium was loaded in the reactor in January 1980... 

The first step in our RCM process is to define the critical equipment (see the criticality assessment example in Table 2.1). You must first go through a systematic assessment of each major asset and its subassemblies, creating a priority list that shows the relative importance of each item as it relates to the business. Following is a list of questions to ask ... 

Recently, two new trends of politics appeared plutonium burning and long lived waste incineration. In this context, one of the three radial breeder rows of the core was replaced by steel subassemblies and the replacement of the two other rows is planned for the next few years. An extensive irradiation programme of minor actinides is being defined. 

An assembly is an integrated set of components and/or subassemblies that comprise a defined part of a subsystem, for example, the pilot s radar display console or the fuel injection assembly of an aircraft propulsion subsystem. An assembly can also be composed of a number of parts, subassemblies, or any combination thereof joined together to perform a specific function and which can be disassembled without destruction of designed use (i.e., they can be reassembled). Typical examples of assemblies are power supplies, memory boards, switching devices, and so on. An assembly would be reflected as a specific level in a system hierarchy. 

A CSI is essentially the same as an SCI except that systems required to identify CSIs have additional statutory and regulatory requirements that the contractor must meet in supplying those CSIs to the government. For systems required to have a CSI list, HA and mishap risk assessment is used to develop that list. The determining factor in CSIs is the consequence of failure, not the probability that the failure or consequence would occur. CSIs include items determined to be life-limited, fracture critical, fatigue-sensitive, and so on. Unsafe conditions relate to hazard severity categories I and II of MIL-STD-882. A CSI is also identified as a part, subassembly, assembly, subsystem, installation equipment, or support equipment for a system that contains a characteristic, failure mode, malfunction, or absence of which could result in a Class A or Class B accident as defined by DoDINST 6055.7. 

A subassembly is an integrated set of components and/or parts that comprise a well-defined portion of an assembly, for example, a video display with its related integrated circuitry. A subassembly would be reflected as a specific level in a system hierarchy. 

Assembly—an integrated set of components and/or subassemblies that comprise a defined part of a subsystem, for example, the pilot s radar display console or the fuel injection assembly of an aircraft propulsion subsystem... 

The decision to produce a part from a particular process is the result of several factors. First, the way a component is designed within the context of the overall product or subassembly sets the stage for its possibilities and limitations. Next, the chosen process must be capable of producing the part to the desired geometry and meet its defined performance requirements. Finally, the manufacturing economics for the scenario must be favorable (1). 

The way to take advantage of an in-depth knowledge of processes is to review complete products or subassemblies and consider how individual parts should be defined within them. In other words, process selection should ideally be integrated into a product s concept development phase so that maximum manufacturing flexibihty is preserved from the outset. Components can thus be defined within the product-as-a-system framework to uncover unique benefits that may be associated with a particular process (2). 

Restart Criterion 3 examines the adequacy of the procedures used to manufacture the subassemblies and assemblies. In reviewing the procedures that resulted from the 300 Area Product Certification, the staff found that the process data sheets provide well-defined administrative controls for manufacturing. The sheets identify the purpose, responsibilities, technical procedures, required training, documentation controls, and the necessary interfaces and approvals to produce a certifiable product. Additionally, the certification procedures require review of the completed data sheets for the assemblies and checks that the requirements of the RTM have been satisfied, and that all required documentation is in place and complete. 

Subassembly An integrated set of components and/or parts that comprise a well-defined portion of an assembly. Motor CPU... 

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