Motor-cars

If maintenance is performed, there are two principal maintenance strategies preventive and breakdown maintenance. These are not mutually exclusive, and may be combined even in the same piece of equipment. Take for example a private motor car. The owner performs a mixture of preventive maintenance (by adding lubricating oil, topping up the battery fluid, hydraulic fluid and coolant) with breakdown maintenance (e.g. only replacing the starter motor when it fails, rather than at regular intervals). 

Breakdown maintenance is suitable for equipment whose failure does not threaten production, safety or the environment, and where the cost of preventing failure would be greater than the consequence of failure. In this case, the equipment would be repaired either on location or in a workshop. Even with this policy, it is assumed that the recommended lubrication and minor servicing is performed, just as with a motor car. 

Some OCs were of the monolithic honeycomb type, but all General Motors cars used peUetted OCs. For a period in the late 1970s and throughout the 1980s, both TWC and OC were used in a dual-bed catalyst. Oxygen needed for OC performance was provided by an engine driven air pump or a reed... 

During the last century and a half, two new closely related classes of material have been introduced which have not only challenged the older materials for their well-established uses but have also made possible new products which have helped to extend the range of activities of mankind. Without these two groups of materials, rubbers and plastics, it is difficult to conceive how such everyday features of modern life such as the motor car, the telephone and the television set could ever have been developed. 

As a blow moulding material polypropylene has never enjoyed the success of HDPE. This is in large measure because moulding of the former requires more attention to equipment design and operating conditions. Many successful mouldings have nevertheless been made commercially including chairs, horticultural sprayers and motor car parts. 

The word model has a special technical meaning it implies that we have a set of mathematical equations that are capable of representing reasonably accurately the phenomenon under study. Thus, we can have a model of the UK economy just as we can have a model of a GM motor car, the Humber Road Bridge and a naphthalene molecule. 

Kraft-wagen, m. automobile, motor car, motor truck, -wagenfett, n. automobile grease, -wageniack, m. automobile varnish, -weeh-sel, m. energy exchange, -werk, n., -zentrale, /. power station, -wirkung, /. (dynamic) effect, action (of a force). 

The modern motor car is made from steel, zinc or zinc alloy-coated steel and some plastic parts, all of which require painting. The main component is the body shell, made from the above metals, and this is coated in a continuous production process. A full finishing system with all four coatings is usually applied for maximum protection and a high quality appearance. 

If a motor car has to be refinished after repair, commonsense suggests that the original finishing system would be ideal for maintenance of protection and durability. However, with tyres, upholstery, fabric and plastic trim fitted and petrol in the tank, the use of such high stoving temperatures is not practical. The practical upper temperature limit is 80°C. This means that none of the original materials is suitable, not even the acrylic lacquer, since this is designed to be sanded and the scratches reflowed at 155 C. 

There are some similarities between coil finishing and original motor car finishes both are required to give good exterior durability and both can be... 

These requirements are usually met with two-pack paints based on hydroxyl-rich polyester or acrylic resins in the pigmented pack and aliphatic polyisocyanates in the activator pack. Cure with this type of finish is relatively fast and complete even at low ambient temperatures. An alternative finish is an acrylic lacquer, similar to the lacquer used for refinishing motor cars. These finishes are applied to the assembled aircraft by operators protected by air-fed hoods and using airless or conventional spray guns. High durability pigments are included. 

Worldwide traffic fatahties have increased due to the motorization juggernaut sweeping the Brazil, Russia, India, and China (BRIC) economies and other countries. Traffic accidents can only be reduced by the concerted efforts of people, cars, and society as a whole. The introduction of seat belts had a positive impact on lowering passenger fatalities and the introduction of air bags among other safety developments in motor cars is expected to reduce this further. 

It is doubtful if any design is entirely novel. The antecedence of most designs can usually be easily traced. The first motor cars were clearly horse-drawn carriages without the horse and the development of the design of the modern car can be traced step by step from these early prototypes. In the chemical industry, modem distillation processes have developed from the ancient stills used for rectification of spirits and the packed columns used for gas absorption have developed from primitive, brushwood-packed towers. So, it is not often that a process designer is faced with the task of producing a design for a completely novel process or piece of equipment. 

Another example is the use of catalytic metals (platinum and rhodium) in the catalytic converter of a motor car. These solid metals catalyse the reaction between the pollutant gases carbon monoxide and nitrogen monoxide. 

In South Africa, owing to the diversity and small production volume of specific motor car models, it is not economically feasible to blow-mold HDPE fuel tanks. The only cost-effective plastic tank manufacturing process used in South Africa is rotational molding, using LLDPE with a density of 0.939 g/cm3. Some selected properties of LLDPE before and after petrol exposure are compared to HDPE in Table 16.2. It is clear that owing to weaker mechanical properties, LLDPE is far less suitable than HDPE for petrol containment, mainly because of its lower crystallinity. 

By a combination of tank redesign and surface fluorination the problems were overcome and today a number of local motor car manufacturers are using surface-fluorinated LLDPE petrol tanks. These tanks performed exceptionally well in petrol permeation tests in which control tanks lost about 16g/day, while fluorinated tanks lost less than 0.5g/day at 40°C. With advanced fluorination techniques mass loss values of less than 0.1 g/day have already been achieved for some of these fluorinated tanks. 

Vulcanised butyl rubber is very similar to vulcanised natural rubber in various physical characteristics but has better resistance to oxidation and has low permeability to gases. Hence, it is widely used in tubes for cycles, scooters, motor cars, etc. It is also used as rubber in many other applications. 

Ashton, R, and Ranky, P. G., (1999, Feb.), An advanced concurrent engineering research toolset and its application at Rolls-Royce motor cars, ADAM (Adv. Des. Manufacturing), available http //www.cimwareukandusa.com, listed and indexed by the Association of Research Libraries, Washington, DC, and the Edinburgh Engineering Virtual Library, United Kingdom, Vol. 1. 

Before the appearance of motor cars and construction of good highways, armored trains were considered very useful. They were employed successfully in American Civil War (1861-5), Franco-Prussian War (1870-1) and Souch-African War (1899 1900) (Ref 1). In Russia, where the roads are generally in a poor condition, armored trains were used in WWI and in Russian Civil War (1918-20). Some of the Russian armored trains were makeshift affairs consisting of an ordinary locomotive protected by sandbags and several flat cars with sandsbags laid along the sides (Ref 2)... 

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